oh .. so he maybe ended up with 0 ohms and fried the card ... the temperature drift of the VR is probably bigger than 50 ohms
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oh .. so he maybe ended up with 0 ohms and fried the card ... the temperature drift of the VR is probably bigger than 50 ohms
Yep, it fried when the VR drifted to 0... I'll bet money on it.
We're talking about 50 OHMS here, people... not 50K. :rolleyes:
How much voltage is at the mod point?
Could be that at the extremely low resistance levels the voltage is causing excessive amperage to overheat the VR.
still working good on yours right? get any records yet?:DQuote:
Originally Posted by Theta
Still good here, nothing major. I don't have water, so I'm not pushing past 1.35v. Up to you guys to go up to those heights.
The VR was never warm under testing, but now I'm using 1W fixed resistors - more insurance of no drift, as I'm sure you guys will agree. Too dangerous with a VR at these low ohms.
MMOuse said he'll show ya 4870 cf on ln2 and vmods later on tonight
Sounds like a plan! :DQuote:
Originally Posted by CCC
Why would it overheat the VR? Let say we have 3v in VR plots --> P = U²/R = 9/50 = 0.18w ...
Assuming that the tension deliverd to the chips can't be >3v and that the VR value can't be <50, you'll always be <0.18w.
On 8800GT, the Vgpu mod is done with a 500 ohm VR...
so this resistor seems to be ideal for the mod? 50 ohm 15 turn .75W (is .75w ok? could you go to .5w for a 25 turn Pot?)
yep looks great.:up:Quote:
Originally Posted by SNiiPE_DoGG
Put a fixed resistance and a VR in serie if you fear this :p:Quote:
Originally Posted by Theta
Pic pls, mine also is stock, cut from original one...Quote:
Originally Posted by adpr_02
How are you guys determining the voltage on the card for the 4870 the only pic I've seen in this thread is just a general area to try out unless I've missed something :confused: I'm going to solder a set of 4 10 ohm fixed resistors together and use that as the mod because I've had experience with vrs moving over time.
4870, VGPU and Pencil mod pic please :shrug:
Pictures 2 pages before: http://www.xtremesystems.org/forums/...&postcount=352
Below for the VR values.
Not sure if it has been 100% confirmed thoughQuote:
Originally Posted by jimmyz
To avoid the resistance getting too low I plan on using a 25-turn 100ohm trimpot connected to a fixed 8.2ohm resistor. Does it matter what wattage rating the fixed resistor has? I can get 0.25W, 0.6W 1W or 5W. The higher the better?
1W is high enough in every cases, don't worry for this. And I assume it is 1w with poor working conditions, which you won't have on your card
THETA
Can you post a real photo of your vmod?
Quote:
Originally Posted by CCC
Sexy I knew they could hit 1ghz I bet he could get some more on it too. Do you know his volts?
im thinking i will do this too because I can get nice metal oxide resistors at my local shop in 10 ohm, as i will be doing 24/7 at the volt mod and not LN2'ing or anything just a small voltage bump should be fine for meQuote:
Originally Posted by keninishna
Guys can you make a pencil mod for the 4870? I really don't like to void the warranty of the card.
pencil is not goodQuote:
Originally Posted by overcrash
for warranty: if you remove the mod and clean the vga you will havan't problem:D
@CCC : only one words " AMAZING " keep pushing it .....realy nice jobs Man..:up::up:
@CCC: Really good score,keep pushing... Can you try 05,06 vantage maybe?
25-50 Ohms is way too low for pencil mod.
Didn't read this thread lately, but here are some things I found out: I hope they help you guys reach higher clocks:
If the VRs get too hot they shut down the card. So I used beefy sinks on them.
There are 2 extra VRs at the top of the card that aren't covered by the stock heatsink, but with the extra voltage they get hot as well and shut down the card.
The chip that we solder for the vmem mod gets HOT!!! I had huge problems with stability, and after sinking that chip, ALL the problems went away, card 100% rock stable.
Final stats:
900/1100mhz with 1.45/1.08v
40C under extreme load, 34C under idle with 30C ambient
15942 marks in 3dmark06
9057 marks in Vantage
http://img.photobucket.com/albums/v4...942marks-1.jpg
http://img.photobucket.com/albums/v4...e9057Marks.jpg
http://img.photobucket.com/albums/v4...sbench4xaa.jpg
The load was taken immediately after 6 runs of the Crysis bench maxed out, no artifacts, NO problems.
Love this card:up:.
from MMouse
voltage 1.46v, temp -68C
http://img168.imageshack.us/img168/1568/03singlefl7.jpg
Beautiful clocks there, guys. Just beautiful. :up:
Now, what is the max SAFE voltage I should be pushing for 24/7 use? I am afraid to go higher than 1.45 even though it is running on load much much much cooler than stock at idle.
I've run mine up to 1.55 for testing.for 24/ probably under 1.5 with water.Quote:
Originally Posted by adpr_02
1.55v is probably fine if you have decent cooling over the VR. I've ran 1.58v on my 4850 cooled by Accelero S1 without any problems for a few hours of benching
I'd like to see what the highest artifact free clocks you can hit on water are adpr. The 4850s seem to hit a ceiling at somewhere between 925-950MHz regardless of volts or cooling. Will run 3DMark fine, but fail ATITool artifact test and Furmark at those speeds. Download Furmark if you havn't already, its pretty heavy on the card, moreso than any other benchmark app I've tested http://www.ozone3d.net/benchmarks/fur/
I can 100% confirm the VDDC mod. It works like a dream.Quote:
Originally Posted by r4st4m4n
I'll probably push it more, but not now. It was too much of a headache getting to this point, even. Maybe in a few days. I'll be sure to report my results then.Quote:
Originally Posted by Miwo
I downloaded furmark, ran it, after 1 minute my videocard - I THINK shut off. my screen went black. I just reset my pc. And I thought I was 100% stable - way to burst my bubble :p:.
told you it was tough on the card :) :)
Yes your video card will shut off (black screen) if you are unstable. You might be able to catch it and ESC out before it does that if you notice artifacts......but usually shortly after it shuts off.
No. No artifacts, just shuts off. I'm guessing something is running too hot..... Damned VRs are making my heatsinks hyper hot and they have 2 120mm fans blowing on them.... the cooling for this card is killing me.
Lowered my clocks to 880/1050 for furmark..... lowered the voltage, too. now I can withstand 4 minutes before my card shuts down. I touch the VR heatsinks and they are, I would say well over 80C.... I can't have my hand on them for more than a second.
I need to get better cooling for that, everything else that I touched seems okay. What are you using to col the VR's? I have a wide heatsink on all 8 chips, but I am thinking that (If I get the balls to rip off the sink now that it's been epoxied) I'll use that whole thing for only 4 of the chips, and get another one just as big for the other 4.
I just have to pray to a few gods tonight that ripping it off won't rip off any of the chips.
Well I am at 730/1100 after the pencil modding with 1.26vGPU/2.11vMem.Using the stock cooler ATM with 2 X 120mm extra fans blowing on top of them as well.
Nw in rthdribl the max temnps of the GPU is arnd 80 degrees but there is GPU Temp # 2 which really goes overboard at 90 degrees. Can anyone tell what these GPU temps #1, #2, #3 are for.
A screenshot of what I am talking it about.
http://www.imgx.org/pthumbs/small/9662/4850%20temp.JPG
Also in the stock HSF it seems there is a plastic covering all around with only the core, and the mem chips , VRMs having small gap in the plastic to have contact with the metal area(anodized Al)
Since its covered with plastic isn't it affecting the heat transfer capability and spread out
Here is the pic
http://www.imgx.org/pthumbs/small/9663/stock%20HSF.JPG
Seems the stock HSF is taking too much heat and its affecting the VRMs , ram too much. So which will be a better cooler, the accelero S1 rev2 or the Thermal right Hr 03 GT. These are the only coolers which I can get locally here.
Finally thanks to all for such a helping thread :D
The HR-03 GT should be the better cooler, but the Accelero will be the better value by far.
@CCC : any picture HD 4870 with mods ...........:):)
I would not wanna use the stock HD4850 cooler with 1.26v. You are putting about 35watt extra trough that heatsink. The HD4870 are doing 1.28v under load. And that massive heatsink is getting very very hot.
So i suggest better cooling for 1.26v.
I have a VF1000 on it now. Still hot 62c load with 1.23v 775-1125. I'm gonna do the memory mod this week.
The HD4850 on 1.25v is consuming 5 watt more than the HD4870 on 1.28-1.29. So that GDDR 5 uses 10-20 watt less than GDDR 3.
I'm not gonna clock the core much higher because at high resolutions it will get memory bottlenecked anyway :) Maybe not in 3DMark but in games the faster GDDR5 is showing boosts up to 25% with HD4850 and HD4870 core both clocked at 750 MHz.
BTW power draw from 1.18v to 1.23 increased with 25 watt. Compared to stock 1.14 you have a increase of 35-40 watt. 1.25 is on par with the HD4870 stock.
i just passed through the last 10 pages, any pencilmod (pics) for 4870 for better oc :f ? would
Single HD 4870 Default Voltage 842 / 4820 MHZ Water cooler Thermaltake AGUATANK Model.
3DMARK2006 SCORE: 17885
http://img56.imageshack.us/img56/5369/178852006nn4.jpg
idle 912 MHZ GPU
http://img56.imageshack.us/img56/6439/910mhzgputl4.jpg
http://img177.imageshack.us/img177/4623/11gs6if0.jpg
Nice results on that HD4870. That memory can be pushed quite high if it does not get hot. But with the stock cooling that plate get so hot you cant hold your finger on it.
I was wondering : was is the maximum wattage the regulation chip can deliver to the GPU chip on a HD4850? I made calculations, running @ 900mhz 1.49v draws 140% more than it draws with stock freq and voltage (240% of the stock wattage) :eek:
Assuming a 120w power consumption @ stock, that would lead to 290w only for GPU, that's pretty high if you ask me :confused:
Anyway, here's what I got with accelero S1 + 120mm @ 7v :
http://clemmaster.free.fr/Hardware/H..._1100_4200.jpg
I've also flashed the card with a bios that was supposed to solve the frequencies issue in double screen (locked in 3D mode) but it wasn't working really good though :D :
http://clemmaster.free.fr/Hardware/H...0_500_4000.jpg
Anyway, that's good to see this chip can run @ 160mhz 0.98v, which would lead to a 18% consumption (<22w) which is nice for laptop :p:
Third thing : I used to be freq limited for memory chip with stock cooler. I mentionned earlier that the pencilmod didn't improve the maximum frequency I could get out of them. I though I had crapy memory chip but here's what I get with accelero S1 and its poors ramsink :
http://clemmaster.free.fr/Hardware/H..._1200_4000.jpg
I am wondering about this too. I was under the impression that the HD4850 could only draw up to 150W: 75W(6pin) + 75W(PCIE Slot). Power consumption of a stock 4850 is already well > 75W under load, and a core @ 900 1.49v would definitely send it right over that 150W envelope, so how is it that plenty of us 4850 users are running well over without much of a problem? Can the 6pin plug actually draw more than 75W?Quote:
Originally Posted by Clemmaster
I'm pretty confused because 4870 users are not hitting any higher even with the extra power circuitry. Perhaps with cold, but on Air/Water we are all toting around 900~ artifact free it looks like.
Also interesting to see that your Temp 2 is a good deal higher than #1 and #3. Any idea where these probes are located? I've read that #2 may be VRM temperature , but have no clue what or where #1 and #3 may be. #1 = same as Core temperature?
I wasn't talking about the PCI-E connector which can draw more than 75w on each 12v wire without any problem, but about the chips that deliver the wattage to the GPU
So what would you guys consider the max voltage for a stock heatsink HD4850 then? I plan on putting different thermal paste on it, probably slap a 120mm fan over the area to help air flow more into my dual HD4850's I got coming but I also would like to at least do the softmod (bios voltage increase) to the card.
Would that be going over the top or is that.. the sweet spot I should be looking at for at least stock cooler.
I might get another Thermalright HR-03 GT if it fits some how on my new board. 2 cards with those... ouch thats going to take alot of space and have to see how that plays out but also depends if I can get the ram sinks off my 8800GT as well. Maybe some other coolers that would be more ideal for the space would be taken into consideration as well.
http://farm4.static.flickr.com/3074/...3d213e_b_d.jpg
I've done the vmod to my 4870 I think its working but I have no idea where to measure the vcore either in windows or with a multimeter. I just soldered 3 10 ohm resistors together and wired it up to the card. Temps aren't bad on stock cooler around 61c load with fan at 52% and clocks seem pretty good with no artifacts but I haven't been able to increase clocks going from 40 to 30 ohms so I'm questioning the actual voltage. I think I'm going to try 20 ohms tonight for around 1.41? vcore.
I will try this when I get my 4850, thjanks
I've got an unusual question.
I've got Chieftec 450W PSU (GPS-450AA-101A). Recommendations for 4xxx series are all the way from 400-550W, but we all know they are targeting cheapo chienese PSUs, as I'm seeing much lower total-system numbers in reviews, and people say that even 4850 CF with quad CPU draws like 350W.
So - will I be able to OC 4850 or even 4870? Not going extreme, but I thought about either pencil Vmod for 4850 (under 1.4V probably) or 4870 OCed without voltmods (I've got S1 to chill either of them a bit so temps shouldn't be problem)
Rest of the system isn't heavily loaded but still:
- 1x 250GB Seagate HDD and 1x DVDRW
- 1x 200mm case fan+2x120mm fans (on S1 and Ninja)
- 4x 1GB DDR2 800MHz (@stock)
- E4400 @ 3.2GHz
CPU is currently heaviest load, but I'd rather lower it a bit if it would alow me to get more out of GPU (if PSU is not good enough)
Like I've said, PSU is Chieftec 450W, and says:
+5V=28A, +3.3V=30A (together max 145W), +12V1=14A(168W), +12V2=15A(180W);(these three 440W max); -12W=0,5A(6W), +5Vsb=2A(8W).
So? What do you experts say? Will this PSU take E4400@3.2 + HD4850@1.4V~800MHz or 4870@stock voltage~800MHz? Depending on your answers I'll be picking my card, and means of OCing, so I hope you can help me :)
P.S. I've seen a guy on OC.uk saying good 450W PSU should be fine even for 4850 CF with Quad CPU, but seeing above calculations about 240% stock wattage scared me a bit, as that's more than 2x in CF :/ Others say 550W for single 4850.. so I'm getting confused :/
I dont think so . I used my APC power chute program to check the power draw from the UPS. With the HD 4850 at stock speeds in load , its arnd 280W (with Q6600, 3HDDs, 5-6 fans, P35 board). When I pencil modded it to 1.27 VGpu & 2.11 vMem and oced to 730/1150 speeds the consumption went to arnd 325~330W. Idle consumption is arnd 210 Watts as the bios is controlling the volts to arnd 0.99V for 2D clocks (160/500). So I guess the GPU is consuming arnd 140~160W in my case when 3D loaded at 730/1150.Quote:
I was wondering : was is the maximum wattage the regulation chip can deliver to the GPU chip on a HD4850? I made calculations, running @ 900mhz 1.49v draws 140% more than it draws with stock freq and voltage (240% of the stock wattage)
Assuming a 120w power consumption @ stock, that would lead to 290w only for GPU, that's pretty high if you ask me
I have done some ghetto mods actually. I have removed the shroud of the stock HSF and put two 120mm fans (in next slot with zip ties) blowing air to the card. In fact putting the stock fan even with both the 120mm fans running helped some more dips in temps contrary to my air circulation thoughts.Also seems my core is requiring quite some volts....1.25~1.26 vGPU load for 730~740 Mhz stable. Is it normal ! I m seeing ppl doing 750Mhz with just bios soft voltage mod :PQuote:
I would not wanna use the stock HD4850 cooler with 1.26v. You are putting about 35watt extra trough that heatsink. The HD4870 are doing 1.28v under load. And that massive heatsink is getting very very hot.
I picked up some 10 ohm metal film fixed resistors @ .25w with 1% tolerance, is .25w too low of a rating for the 4870 Vddc mod if i string 3 of 'em together???
on another note: i have a REALLY good clocking 4870, at stock voltage it clocks up to 875/1100 :D :D :D im going to pick up waterblocks and full 2nd loop tomorrow for the beast, unfortunatley im still waiting for my second card on newegg RMA :(
HD 4870 voltmod article posted: http://www.techpowerup.com/articles/...g/voltmods/153
would be really cool if there would be a volunteer to add more text to these articles for less experienced readers
Ok this is making me mad i tried the pencil MOD and i shaded ON TOP of the resister like the picture shows i got a 4850 card and when i boot up the voltage under load is still 1.18.
THIS is what i looked at:
http://forums.techpowerup.com/showthread.php?t=64217
Now in bios i set to 1.263 and all i get is 1.18
So wtf am i doing wrong????
I have a 4H pencil and i put a little bit of force to cover ON TOP of that resister the BLACK area i went from one side to the other ACROSS THE TOP of the resistor.
IS THE PICTURE CORRECT???
IS IT THE SECOND RESISTOR OR BASICALLY THE MIDDLE ONE????????
what is wrong guys????
PLEASE POST ASAP AS I AM HERE NOW WAITING.
Sorry for CAPS, but i tried it three times, take card out anfd put back bootup and such.. blah blah blah.
measure the resistance across the resistor before you pencil it. also measure the gpu voltage before pencil modding
then pencil it, yes it's the one in the middle (assuming you refer to gpu voltage mod pencil), exactly where the pencil tip is pointing
after you pencil'd measure resistance again, it should be lower. if not you didnt pencil right.
if you still get the same voltage even though the resistance across the resistor changed then let me know so i can investigate myself
and dont use caps it hurts the eyes
Can someone please confirm the stock vGPU and vGDDR values on the 4870?
Ok i tried again rubbing pencil over the top of the resistor and booted up and same thing 1.18-1.19 is all i get.Quote:
Originally Posted by W1zzard
I even rub it a little more then before seen some lead fall off too. lol.. i blew that off of course.
I don't get it.
I measured it at 1.868 then after pencil it measured 1.796-1.798
My volt meter has 2K setting not 20K, not sure if that matters.
My volts before are 1.18 and of course 1.18 after loading up ATI TOOL artifact for not even 1 minute.
Can anyone help??
Gurusan??? anyone???
works for me
no pencil = 1.855k 1.141V
w/ pencil = 1.441k 1.167V
Yeah sure i got lower readings too, but when i booted up and tested Volts it was still the same.
Now i was in other thread and the fella in there had similar issues.... so what he did was pencil the side of it 1-2 strokes.
I just did this about 3 min ago and it drop 1.868 to 1.665 and when i booted up and check Volts = 1.22v now instead of what i had which was 1.18 and i just ran a 3dmark 06 at 740/1100 and this time it passed no freeze up, but like we all know one is not good enough.... lol
Now i may try again 750mhz to see.
Also what happens if pencil dries up or gets blowen off.. or whatever.... will card boot... lol
I can't pencil mod mine either. I have applied and reapplied the mod to the top of the pictured resistor and It did nothing.
Could they have sprayed like lacquer something over that area to prevent mods?
I can tell somethings different though when I hear you guys say you layed down a couple of strokes and changed the resistance dramatically.
Some one recommended sanding the top of the resistor could that work? I tried the other point aswell and neither gained me anything.
What dissolves lacquer? How about pure acetone hmm. I'll post back in a while.
I stated this in my post above yours:Quote:
Originally Posted by foch3 -USA-
Now i was in other thread and the fella in there had similar issues.... so what he did was pencil the side of it 1-2 strokes.
I wasn't comfortable with that because of the proximity to the other resistors.
Edit: I just cleaned the surface first with acetone and reapplied the pencil mod and it was a success. I am at 1.24v 3d. 775mhz gpu artifact free for now.
All the more reason to get the memory running as fast as possible! :yepp:Quote:
Originally Posted by Astennu
@Beast: What brand do you have? can you post brand and part number? Maybe see if its similar to the others with this problem so people know to watch out for it if it is indeed an issue with a batch of them, or a 'mfg'.
I guess i have to REITERATE my QUESTION always an issue in these threads is getting people who are experienced modders dont help out some of us :D ;)Quote:
Originally Posted by SNiiPE_DoGG
I practiced soldering on my 7800 gtx today (dead already) and I got to the point where i can solder to a contact and then when I pull it off it yanks some of the micro traces :)
Well, I re-sinked the card with even bigger sinks. So right now I'm at 880/1050 with 16 minutes of Furmark stable. I don't think that I need more time, once I reach my final clock/setup I will run it for 1 hour:D.Quote:
Originally Posted by Miwo
http://img.photobucket.com/albums/v4.../IMG_36021.jpg
Once I get my friend to lend me his n/b heatsink I'll cover those things circled with bigger sinks as they get toasty and push more. I WILL push for 925 when I get that. But for now, I'm happy with my stable card....finally:up:.
Btw. There are 2x120mm fans blowing air at 12V on that bloody card.
hey dude, what did you use to stick those sinks on there?
Probably little glue in the corner mixed with thermal paste
Hi all it my firts time with pencil mods on a GPU ,I have a couple of questions
I have 2 Radeon 4850 and would do the 2 Pencil mod for each card with a Thermaltake Duorb on the 2 card and Zalman ramsink for ram.The probleme is I dosen't have a multimeter.
1) Can someone know how line I need to do for juste boost the voltage littil ?
2)This is for 24/7 what safe voltage I can put ?
3)I hope put the 2 card at 800MHz/1150MHz it realistic ?
Thx in advance and sorry for my english again ,I am a French QC.
Quote:
Originally Posted by WheelMan
Quote:
Originally Posted by Clemmaster
first don't pull it off.... second you maybe holding the heat on it too long and soaking heat into the board. pre-"tin" the leads.( melt a tiny amount of solder on to the wire) and it shouldn.t take more than three sec's for the solder joint to be formed. when the joint melts remove the heat and hold it in place until it cools.Quote:
Originally Posted by SNiiPE_DoGG
I would not go 1.4v with that PSU. You are talking about increasing the power draw with more then 50 watt. From 1.19 to 1.23 gave me a increase of 25 watt. Stock is 1.14v So i guess we are talking about 230 watt or even more with 1.4v.Quote:
Originally Posted by LuxZg
You need a good PSU for that. My system only is drawing 380 watt with the 1.23v. And if you have a 450 watt. That not only 12v. Maybe 300-350 = 12v wattage. And the card in 1.4v will draw 230 on the 12v only. And then you still have your cpu and stuff thats also pulling from that rail. I suggest you lower your ambition to 1.2-1.25v or buy a 600 watt + psu.
Quote:
Originally Posted by jason4207
Yeah i'm planning on doing the mem mod. To see if i can hit 1175.
Still waiting for that HD4870 1GB or the HD4870 X2 2GB :)
Ok, so I'm either stuck with BIOS mod (1.21V) or buying non-OC 4870. Though I don't get it - how could this card be pulling this much power (230W over just one 6-pin PCIe connector + PCIe slot?). And I persume my E4400 if clocked down a bit to 2.6/2.8 should be less power hungry than your 5600+ X2..Quote:
Originally Posted by Astennu
Bad thing is that for a difference to 600W PSU I'd be spending too much on this whole setup (VGA, PSU, and I still need display as I'm on 17" CRT right now :/ ) grr! Btw, how is it than they run OCed quad+4850 CF with just 335W power droaw (?)
Well if you have a good psu and the PCI connector is on a rail that can handle it its no problem. Those 3 12v wires can handle the wattage only the PSU should be able to do it. The pci 1.0 specification is rated 75 watt for the connector. So a 1.0 certified connector should at least be able to handle 75 watt. But new psu's can easily do more.
The HD4870 is pulling about 40 watt more then a HD4850. A HD4850 on 1.23v 776-1125 is pulling 5 watt more then a HD4870 on 790-1100. The HD4870 is running 1.28v.
If you go from 1.19v to 1.23v on the HD4850 you get + 25 watt. So you can make a indication of how much 1.45v will use on the HD4850.
Ive done the pencil mod on my 4850 but over 1.35v im getting random reboots when running Fur bench even as low as 700 on the core. im running a 850w Silverstone Zeus, do you think this extra voltage is pulling too much ? i dont want to buy another psu and find its the same. Is the sinlge 6pin on the 4850's enough ?
btw card is water cooled, never going above 45c and i have heatsink on the VRM's and according to GPU-z the dont go over 45c with a fan blowing on them.
*EDIT*
Quote:
Originally Posted by adpr_02
both my cards do the same as yours, what temps does GPU-Z report for your vrm's ?
Hey guys
What's MVDDQ and MVDDC? How do they affect stability? Saw them on W1zzards awesome vMod page :)
Thanks
900/1175 and counting :D
I would say try the hard mod. Maybe the connection you made is not stable enough so the voltages are fluctuating.Quote:
Originally Posted by Devious
You are talking about a HD4870 right ?Quote:
Originally Posted by I34z1k
Good stuff mate but where are the results ? How do you get past the ccc gpu ceiling (without bios flash)?Quote:
Originally Posted by W1zzard
:up:
Yep.
@ Aussie, use AMD GPU tool ;)
Thanks, seems that 4870 is more power efficient, and I see it running on 278W (whole system with quad cpu, non-oced) so I should be fine with it on stock clocks or moderate overclock, which is still good for my PSU while 4850 OCed to same speed would obviously be overkill :( Tnx for helping!Quote:
Originally Posted by Astennu
Thank you , I have a pair of 4870's coming tomorrow and I want to get everything I can out of them.Quote:
Originally Posted by I34z1k
:up:
Epoxy. It's my first time ever using it on a computer component and it works like a dream. Removing the sinks is basically just twisting them off - reall nice stuff. I might have to ditch my AS5 :rofl:Quote:
Originally Posted by Laykun
According to Qimonda's data sheet, MVDDC is the device supply voltage(gddr 5 data sheet)/ power supply voltage (gddr 3 device sheet), and the MVDDQ is output supply voltage(gddr 5 data sheet)/ power supply voltage to i/o buffer (gddr 3 data sheet).Quote:
Originally Posted by I34z1k
I am quoting the gddr 3 sheet because it seems to explain what MVDDQ is more clearly compared with the gddr 5 sheet - however, Qimonda might have changed terminology with gddr 5, so don't trust the gddr 3 definition blindly.
Now, regarding voltages for MVDDQ and MVDDC - I dont have my card yet, so I dont know the actual card voltages, but guestimating with the gddr 5 data sheet in mind suggests maximum operating voltage for both MVDDC and MVDDQ at 2.0 volts, and the operation max voltage at 1.545 volts. However, since the gddr 3 recommended max operation voltage is 1.9, and that we have seen 2.1 volts for MVDDC for the gddr 3 on the 4850 (a ~10% increase) I would guess that the gddr 5 could be run at ~1.7 without adversely affecting product life and stability. Then again, this is only a guess and should be taken with a grain of salt.
cheers,
Protagoras
edit: seems like the voltage specs are the same for both MVDDC and MVDDQ, so I would get them both to the same voltage.
So shouldn't there be a mod for MVDDQ on the HD4850 also?
well... quoting form the data sheet, "GDDR5 SGRAMs are designed to tolerate PCB designs with separate VDDQ and VDD power regulators." However, this suggests that GDDR3 might not have this design feature, and its only available on GDDR5 memory. i.e, MVDDQ and MVDDC are the same/controlled by the same controller on GDDR3 boards, like the 4850, while the 4870 and future GDDR5 boards will have split controllers for MVDDC and MVDDQ. However, why they would split the two is beyond my knowledge... perhaps its there to add better voltage regulation, as "AC noise in the system is estimated at 50mV peak-to-peak for the purpose of DRAM[GDDR5] design" - which would mean that higher peak to peak noise to adversely affect the module's function.Quote:
Originally Posted by DemonEyez
edit: added more info
Didn't have the X1900 en X1950 series also have separate MVDDQ and MVDDC? And those card also used GDDR3
If I remember correctly you could mess with those two in Atitool.
Hello together, can someone confirm/have tested the new pencil mod for the 4870? They post it on techpowerup: http://forums.techpowerup.com/showth...017#post876017
I am not in that soldiering, but pencil is ok. I pencil modded my evga 780i maiboard.
Thanks for an info
W1zzard.. Posts here as well and he is the one who posted that techpowerup Voltage info and knowing W1zzard he tested it out before doing so.
Pencil mod is only for the memory. vGPU mod is solder-only.Quote:
Originally Posted by Atzenkeeper500
Quote:
Originally Posted by W1zzard
Yup, IIRC.Quote:
Originally Posted by DemonEyez
Quote:
Originally Posted by aldamon
yup you are correct. I just checked and it seems that the r580 used the same or at least a similar digital voltage regulation to the one found on the 4870. From what I can on the board itself, it seems that the voltage regulation part for the memory is composed from two Pulse pa0511.221nl modules and two other chips, which I guess are vt200 series modules - I would guess that one set of vt200+pulse deals with the vddc and the other with the vddq. since I didn't really understand it at first, I researched how the memory access works with the gddr modules, and it seems that memory works by doing a column search followed by a row search in order to find the right bit - i.e find the data stored in the memory, which is then transfered to the buffer and from it to the lane to the gpu/cpu/ect. (I know, its a pretty bad explanation, but thats the best I got:shrug::yepp:).
anyhow, so I assume that the vddc is "in charge" of the column search (CAS) and the row search (RAS) while the vddq is "in charge" of the buffer output.
Though I havent got the slightest clue why they would have two different power regulations for vddc and vddq
Is the new AMD GPU tool with support for 4800 series cards out yet?
Yes, version 0.9.8Quote:
Originally Posted by Zucker2k
I cant get it working with crossfire though.
Can someone help me please , I have drop the 1.865 ohm resistance to 1.644, but how I can know the voltage now ?And for the memory , I have a 3.9 ohm resistance , I need to drop it at how much for 2.15V ? thx for help in advance :).
Here is my voltmod for the 4870, please tell me if you see anything wrong :up: , I haven't been able to try it for myself yet because the 2nd card isnt here yet and i need to set up the water loop all at once
I used 3 x 10 Ohm metal film resistors in series. Note to any other first time volt modders like myself, that vddc point is a :banana::banana::banana::banana::banana: to solder to so make sure you are very practiced before you go for it.
http://img68.imageshack.us/img68/5676/img0977ew5.th.jpghttp://img66.imageshack.us/img66/3144/img0976qs4.th.jpghttp://img59.imageshack.us/img59/895/img0975dp9.th.jpghttp://img66.imageshack.us/img66/8646/img0974zz5.th.jpghttp://img65.imageshack.us/img65/635/img0971ds2.th.jpg
is a 47ohm trimmer ok?
yes 47 ohm is great
I downloaded a gpu tool but as above it doesnt support my 4870's. Does that mean Im stuck at CCC's 790 ceiling for now ?Quote:
Originally Posted by Zucker2k
I found the new one but as mentioned it doesnt seem to like CF .
Why does my 3D06 score go backwards when I clock to 790mhz ?
:up:
Just a bit of info about power requirements and so on. I've asked Steve on legionhardware.com to check power consumtion of OCed system if possible, and he gave some extra info over here.
System is Q6600 @ 3.0 GHz with HD4870+Accelero S1. Rest of system is pretty normal (500GB disk, 2GB memory, X48 chipset). Stock temps are 74 idle, 82 load (stock clock/cooler) under Crysis.
Power consumption was 193W/295W and on 830MHz core/1150MHz memory (with S1) it got up to only 202W/303W (idle/load). You can see more data (temps, consumption, 790/1100MHz OC which is top with CCC, etc) in third post.
830/1150 was max oc with this setup.
Since you people say rising voltage on 4850 would result in much higher power (400+W) on around same OC (800+ MHz) I guess paying extra $$ for 4870 is better than paying extra for 4850+new PSU and than still having to bother with voltmoding and the rest.
And 303W total power should be more than acceptable to my 450W PSU even if it had lousy 75% efficiency. And I still have just dualcore vs quad (which is used in review)
Thanks for advices everyone, and I hope this info will help others as well!
Is there a different solder spot fro the 4870 gpu v mod ?
see I killed the trace shown here in the pic. The little dot on the right side.
I see the same trace on the gpu side I could use but I would have to remove the cooler..
pain in the butt.
http://www.techpowerup.com/articles/...ddc_solder.jpg