thank you... do you remember something about the vmem incresing?
i've founded this in old pages, but the user wasn't sure:
http://www.postimage.org/aV12hJDS.jpg
and what about the vmem measure points?
Printable View
thank you... do you remember something about the vmem incresing?
i've founded this in old pages, but the user wasn't sure:
http://www.postimage.org/aV12hJDS.jpg
and what about the vmem measure points?
I didn't care about VMEM, so I can't say much about it.
thanks anyhow. :)
does someone else know something about the vmem mod on the sapphire dual slot?
Hey, can anyone please help me out and tell me the value of the circled component, which is what I beleive is a capacitor? I was taking off my RAMsinks and while cleaning accidentally pulled it off and lost it. :down:
HIS Hightech HD 4850, the actual card is green in colour but the layout is the same. It is under C635 the second component up from the large capacitor.
Thanks alot!
Alexey
do you mean those two ? and do we know witch one is the Mvddc and witch is the Mvddq ?
i have one of those and i'am going to mod the Vgpu but i want the Mvddc and the Mvddq as someone said MVDDQ can provide more oc headroom
Attachment 96230
ΟΚ 10κ Vr is not working on the sapphire it dose not adjust the voltage at all :(
and yes it is soldered correct on the card it gave the card a small bump on the voltage from 1.32V it went 1.36 but thats all not more
how many Ωhms do you measure from the soldering spot to the ground ? are you sure it 10k your vr ? as i measure we need a ~500k vr not a 10k
EDIT
500k Vr did the job fine :p
YIKES! That was suppose to be 100K not 10K. I've changed the caption for the correct value. Thanks for actually questioning it :up:
Your 500K may actually work better if you ever need to get back to stock volts. I chose 100K because it gives me finer control with my shaky hands :D
:p: no prob mate but i still cant understand something :p even with the 500k vr my card cant raise the voltages the 500k vr raises it about 0.5 and then it stops :p: i might have done the mod wrong i wll check it out again :)
pff done it :)
http://img10.imageshack.us/img10/400...e4870vmodm.jpg
Any chance one of you could clock match the 4890 (850/900) and do a couple of benchmarks vs stock 4870?
Great job finding the pin-out diagram :bows: Looks like my original "shot in the dark" mod was a bit off the mark...it's working much better now :D
I've updated my orignal post with your new info and all due credit :up:
BTW, what clocks are you running with 1.4v? I can only get up to 880mhz Furmark stable.
Hello!
I'm buying Radeon 4830 next week. I know that every 4830 has the same PCB as 4850. I'm wondering whitch of the cheapest referent cards are the best to do pencil mod (if there's any...): Gainward, Sapphire or maybe Powercolor??? I'd prefer Gainward because of its warranty in my country. My primary object is that I could be able to do pencil mod of that specific card.
Gainward would probably look like this one:
http://sklep.e-skarzysko.pl/media/ca...e8615d50d6.jpg
Sapphire:
http://img.hexus.net/v2/news/sapphir...4830-4-big.jpg
Powercolor:
http://nvision.pl/img/200810/powerco...hd_4830_02.jpg
I'll change stock cooler with Accelero s1 plus 120 mm fans.
So what are your opinions?
Thanks in advance :)
Thanks, looks like 850MHz does not give a 20% gain over the 4870
pff so it's my bad luck :p
with 1.5 i cant pass 880Mhz :( and i think the mosfets are getting so hot that the card return artifacts
can you post a picture on how you cool the card plz :) ?
It's just a MCW-55 GPU block and a 92mm fan blowing down on the card:
http://img243.imageshack.us/img243/3396/4870vmod012.jpg
damn same thing here but the card wont clock good :(
Hello,
can anyone please help me with the OCP and OVP Mod for my Powercolor 4870 pcs+ rev2.
The card have a NCP5388 Voltage Regulator. http://www.onsemi.com/pub_link/Collateral/NCP5388-D.PDF
Vmod is 200K Trimmer from Pin19 to VR.
http://www.abload.de/thumb/ncp5388_1zqfs.jpg http://www.abload.de/thumb/ncp5388_2bbt8.jpg http://www.abload.de/thumb/06_18121f4mp.jpg
I flasht the card to 950Mhz Core and take 1420mV for a short Test with LN2. It´s work wonderful since the firts moment. But when i turned up to 1460mV the System crashed under load and the output Voltage goes down to ca. 200mV.
in the Data sheet Page 25 and 33
But if the OVP is not adjustable and works only at soft−start, the reason can be by OCP?Code:OVP
The overvoltage protection threshold is not adjustable.
OVP protection is enabled as soon as soft−start begins and
is disabled when the part is disabled...
The OCP works via a resistor divider between Pin12 and Pin13. Page 7 and Page 25
Can i pencil the marked resistor to disable the OCP?
Thanks.
Seb
Ps: sorry, its not the best english
Hello, I finally managed to take a nice close up pic:-
http://img6.imageshack.us/img6/6862/...2hd4850.th.jpg
Can you help me in volt modding my vGPU now?
lycanwrath,
You have been PM'ed.
does this mod apply to the 4830 aswell?? its the same board as the reference 4850 board, so maybe its the same mod ?? Please answer :D
If the board is physically the same then it works, yes.
Hello!
I've got now my second 4850, and first was killed by Vmod, I guess. Though I only overclocked and overvoltaged it for playing Crysis, and it was under Accelero S1, after two months of using I've got unrecoverable artifacts on screen, which, I guess, was because of memory, though I didn't make mem Vmod. Guys from seller's support replaced the card (shame on me), I've been using it for more than 4 months by now.
I want to install S1 again on new card, cause it's hot. My question is what to pay attention so the card can function properly? If I'll kill it again they won't replace it, I think.
It's ASUS 4850/512M/A - nono-ref with glaciator fansink, 3-phase power supply. Those humorists from ASUS left it with no MOSFET and memory cooling(mem is completely the same as on reference)! If I install S1, can I overcklock it on stock volts without heatsink on MOSFET? What other risks exist?
Thanks for your work, guys, and for helping noobs like me:up:
where can i find the "bios mod method" for the overdrive (700/1200) in the CCC ? I want to push away the limits, but can't find the post here!!! :D Thx
edit : all is ok now!!!! :D
As long as all new posts have vanished, I'll ask once again: is there pencil GPU Vmod for this card?
http://ceemic.pri.ee/hardware/hd4850_2/
I'm sorry for asking so many times, but I really want to make that mod.
Thanks in advance.
I posted this allready, but database loss again...
http://ceemic.pri.ee/hardware/hd4850...50_mod_pen.JPG
Thanks a lot!
Do you know, what resistance corresponds to certain voltage?
can someone help with this guy
xfx 4850? THX
shot of the back
http://img.techpowerup.org/090426/xf...-scan-back.jpg
front
http://img.techpowerup.org/090426/xf...scan-front.jpg
Scrizz, do a close-up macro from that area:
http://ceemic.pri.ee/hardware/xfx_hd4850_1.JPG
And say the markings on that chip.
PS. Please use thumbnails or links instead of these fuge pics on Your post!
Lower resistance means higher Vcore, yes. But the correlation ins't mathematically linear probably.
Lower the resistance by 10% and see how big Vcore jump was.
Resistance-voltage correlation should go about like this:
Code:vcore × [Ω orig]
────────────────── = vcore new
[Ω new]
Oh, sorry, I should have watched ALL pictures before asking.
Anyway, it's clear to me now. I'm waiting for VRM heatspreader, after I'll have it I make VM and post results.
Thanks once again.
Hi ceemic
I'm also interested on this voltmod for the XFX 4850 XXX, more on pencil mod than hardmod, but any of the 2 it's ok.
Here is the close-up photo.
http://img125.imageshack.us/img125/666/hpim2242.th.jpg
I hope it's ok. The marking of the chip are visible.:up:
Thanks.
Paulo
aGeoM, XFX HD4830 uses the same IC and has pretty much the same layout. Check that thread: http://www.xtremesystems.org/forums/...d.php?t=222852
Thanks, I will follow that thread. :toast:
Thx ceemic and aGeoM
I don't have a camera so...
ThX!
I have an offtopic question here. Help me, please.
How do you people think which RAM heatsink is better: from AC S1, or these copper Thermaltake?
http://www.dclstore.co.uk/images/pro...cl-c0025-l.jpg
Each has obvious pros and contras... TT is very heavy, it can unstick; it's fins are thick, space betwwen them is tight - hard to create good airflow. But it's copper. AC heatsink has a little bigger fins, they are thin; but it's Al... I don't know which to choose:shrug:
The correlation between resistance change and vcore should indeed be linear, as there are only resistances in the feedback loop, AFAIK, and resistances are linear parts.
The only thing non-linear is the resistance/turn curve of a potentiometer, which gets highly non-linear in the lower reistance regions.
I've read some basic things about PWM DC-DC voltage convertors. According to simplified scheme, that resistor should be the part of voltage divider, which normalizes output voltage to compare it to internal reference voltage. In that case correlation resistance/output voltage should really be linear.
HI there ;
can any one help with this card : palit sonic non reference design ?
if possible the pencil mod for the gpu , if not just the GPU soldering mod .
http://www.xtupload.com/new/image-F8E6_4A0368B8.jpg
http://www.xtupload.com/new/image-A075_4A0368B8.jpg
Have a look at these two pics:
http://www.hs-augsburg.de/~ingmar_k/vgpu.jpeg
http://www.hs-augsburg.de/~ingmar_k/vmem.jpeg
And then give me the details.
http://www.xtupload.com/new/image-2B8F_4A055D1F.jpg
http://www.xtupload.com/new/image-60C0_4A055D1F.jpg
Thanks
Hi there i tried to write the marking but this was pretty hard since the latter are almost erased , for the VGPU image it was impossible to read the hole marking i just wrote what was possible , sorry .
The question is is pencil vGPU mod possible ?.
EDIT : after more checking the gpu chip marking in 90% : ncp 5388
A trick to make the markings visible is taking a q-tip, rubbing some white thermal paste on it and then smear that onto the chip markings. Then remove the thermal paste again, maybe using another new qtip. Now the white thermal paste should've left some residues on the chip, which should make the markings a lot clearer. ;)
And concerning the pencil mod question:
I will tell you what resistances are needed and between which pins. I won't tell you exactly where to pencil. For one, because pencils should be used for writing and not for vmodding hardware. Anyone who thinks that a pencil is perfect for influencing a feedback line and getting long-term stable results that way, should seriously rethink that.:up:
So, please check the markings again to make sure they are correct.
Hi there ;
thanks for your reply
I confirm the chip is ncp 5388
note : i tried the volt mod ((just like the sapphire card using the same voltage controller)) to the pin 19 (50 h vr) but this result in black screen , i tested the vgpu and found it was 0 . So the point was wrong . could u please check with me .
here the point market in blue.
http://www.xtupload.com/new/image-8E23_4A071EB9.jpg
You know that you probably killed your card?
That's why you always need to double/triple check. Just because a circuit looks like another one, or uses one identical chip doesn't mean that it is the same. Will have a thorough look at it when I find the time.
Edit: Measure resistance between pin#19 (Vfb) and pin#14 (AGND), with the system completely disconneced from the wall. Of course you can use alternate soldering points, that are direcly connected to these pins, but make sure that they really are.
Thanks for reply , i will measure the resistance later today when i get back home .
I have tried this mod since the author confirmed that it work on palit sonic video card same design as mine (check post #1164) , but the card was the HD 4850 sonic.
celemine1Gig thanks for your support :up: .
messured resistance between
pin 1 - 19 = 10.06 k
pin 14 -19 = 9.75 k
I would recommend either 2 200k potentiometers connected in series (resulting resistance of 400k), or alternatively a single 500k (or at least! a 200k) potentiometer. Keep in mind that the latter will have less precision in lower resistance (=higher voltage) ranges.
Anything less, concerning the total resistance, would give too much of a default voltage bump IMHO.
Set (all) the potentiometer(s) to their/its max. resistance and connect them/it bewteen pin#19 and pin#14. That should work. Maybe you got a black screen because you hit the OVP voltage limit. Then you could consider yourself lucky.
BTW: What the heck does that mean "50 h vr"?
And another thing:
I'm sorry, if this sounds rude, but do you even remotely know what you are doing?
Why would you want to measure resistancee between pin#1 and pin#19, which correspond to "EN" and "Vfb"? What do you think has the "Enable" pin to do with the feedback in terms of a vmod.
Quote:
Originally Posted by NCP5388 datasheet
HI there ;
i will try with 2 x 200k or 500 k potentiometers ,
i meant 50 k potentiometersQuote:
BTW: What the heck does that mean "50 h vr"?
No i don't know :-) , i just saw a post above asking for the resistance between those so i measured it , may be it will be useful for u .Quote:
I'm sorry, if this sounds rude, but do you even remotely know what you are doing?
Also can i solder to other points since the pins are pretty hard for my low soldering skills ,
If yes please show them in the picture above .
Also were can i check the vcore , (i tried those)
http://www.xtupload.com/new/image-A092_4A083512.jpg
they show 1.28v 2d and 1.33v (3d) , note with video card turbo button on .
never checked with the normal mod:D
Try using the empty solder pads to the right, that would normally be occupied by some SMD capacitors. That's a better place to measure the real VGPU, because it is behind the inductors and not before them, like the points you marked.
And concerning VMem: One of the two AWP7065 probably regulates the memory voltage. Question's just which one (I would guess that it's the upper one). :) Some esaurements should clear that up.
Of course you can use different solder points, as long as they are directly connected to the named pins. And I won't mark them as I can't test the electrical connection. You can do that. It really isn't very complicated.
HI there ;
After checking i found that the pin 14 is not directly connected to any other point . this is clear from the PCB pic ,
so even if not directly connected can i solder to it ?
pin14 probably "dives" into PCB where it's connected to GND. So You have to use some other GND point near that IC. celemine1Gig might know it better...
Yep, normally any GND point should work. The best option would be to use a point directly connected to AGND, as this is the real reference for the feedback line, but as AGND and GND shouldn't differ by much (AGND should be less prone to interference), it should theoretically not matter at all if you used just GND instead. The difference between GND and AGND as reference should max. be in the mV range.
And now post a highres picture with your exact solder points, for other poeple with the same card, as reference. ;) I mean, I know how to work out mods, but others obviously don't, so this way you can give something back to the community.
Maybe you can even put all the needed info + pic in one final posting, so one can link to that one posting in case someone's gonna ask for the mod in the future.
First i want to thanks celemine1Gig and ceemic for their help finding the right vmod for the HD 4870 Palit soic edition (dual bios and dual fan) ,
here is the video card picture :
http://www.xtupload.com/new/image-0940_4A0ECCF9.jpg
The vmod for the card and the vcore measure points :
http://www.xtupload.com/new/thumb-96AB_4A0ECF14.jpg
http://www.xtupload.com/new/thumb-7D79_4A0ECF14.jpg
Here is some result using 2 Gb ram (470 mhz) , E8500 @ 4.2 Ghz (470x9) , p5q , 1000w psu , raid 0 :
Note : stock volt according to point above was 1.335 v (maybe palit over volted the card ). the card max stable was 800 mhz GPU and 1050 GDDR5
@ 1.44 v (load) 900 Mhz stable
http://www.xtupload.com/new/thumb-D714_4A0ED027.jpg
@ 1.44 v (load) 920 Mhz
http://www.xtupload.com/new/thumb-87D1_4A0ED089.jpg
@ 1.44 (load) 940 Mhz
http://www.xtupload.com/new/thumb-2D5A_4A0ED0D3.jpg
@1.5v (load) 950 Mhz
http://www.xtupload.com/new/thumb-BDD2_4A0ED114.jpg
@ 1.55v (load) 960 Mhz
http://www.xtupload.com/new/thumb-F347_4A0ED13A.jpg
@ 1.6v (load) XXX??? dark screen with restart GPU voltage show -0.03 v maybe a rest or OVP ,
975 also passed the test @ 1.55v but there was a lot of artifact , so i decided to not publish the result .
Any OVP mod for my card , i am looking for 1000 Mhz benchable
makaka, 960MHz is very good OC :)
The OVP mod would probably include cutting one trace. To decrease the 1.3V limit at pin#17 (DIFFOUT), one would have to increase resistance between Vfb (pin#19) and DIFFOUT, in order to decrease the voltage at diffout. Probably not worth the effort as ~1.6V is very high already. I'd rather say that perhaps some other mods. Better filtering VGPU could help get another extra MHz. Sometimes, voltage alone isn't really that helpful.
well what should be safe VGPU then for 24/7 usage under water , (40- 44 c load) ?
Is there a pencil vgpu mod for the XFX 4850? I've found the mod thread, but it only has the solder mod. TIA.
Hello
Is there a pencil vgpu mod for the Gigabyte 4850 512mb? Or soldering mod?
Here are the pictures http://i696.photobucket.com/albums/v...h_P5250409.jpg http://i696.photobucket.com/albums/v...h_P5250416.jpg http://i696.photobucket.com/albums/v...h_P5250417.jpg
there is no known pencil mod for the card , go with hard mod for stable voltage
Hi there! I have not vmod anything in my life so I'm a complete noob at this.
I currently have a HIS 4870, blue PCB and probably referenced design. Just to confirm, is this techpower voltmod guide applicable to me? And how does one change and monitor the voltage, like makaka did?
edit- what about this one? http://sandwichamwin.blogspot.com/20...ng-hd4870.html
@ blazingfire: Take a look at your card. Does it sport 1 or 2 "VT1165" regulator chips? If yes, you won' t need a hardmod. Just use software described here
@ Syl & Vatos Locos: Thank you both mates! I used your hardmod to rise the VGPU on my Sapphire blue HD4870 512MB non-reference. :D
Right now I am @
GPU 935MHz / Mem 975MHz 3DMark Vantage stable @ VGPU 1.47V :up:
still testing...
http://www.abload.de/img/dsc00073_kllmsq.jpg
I am looking for a vmod for my asus 4870 512mb dark knight,not top version.Without looking through loads of pages here,does anybody know if there is one in this thread please.It is this one-
http://img.techpowerup.org/090626/asus_eah4870_die.jpg
http://img.techpowerup.org/090626/as...4870_power.jpg
If there is not onw in here anywere,i will try and get some close up pics of were ever they need to be of.
I think its using this voltage controller-ADP3290
http://www.onsemi.com/PowerSolutions...ADP3290JCPZ-RL
thanks
TI66ER
Goldlocke lucky b :p: my card cant go more than 880mhz even with 1.5vgpu
haha you're lucky.Mine couldn't do 880Mhz core...only 870Mhz with 1.5V on dice for 3DMark06:D
bad luck ? or bad cards on Greece bro :p:
Maybe you're right!!! BUT hipro's one could do 1100Mhz core:D But ok he is a moder from another planet:p:
BTW some photos from mine card moded
http://img99.imageshack.us/img99/3851/dsc00173kd3.jpg
http://img209.imageshack.us/img209/208/dsc00174uh2.jpg
http://img209.imageshack.us/img209/660/dsc00176oi6.jpg
i got 3 card Palit HD 4870 and all of them do 900 mhz stable @ 1.4-1.5v , the best one did 980 Mhz under water with 1.6v and passed 3d mark vantage , all those card are sold now i keep my old HD 4870 which also rock solid @ 900 mhz , can do higher but i am already happy with the current result
@Blazing fire
I jsut plugged a multimeter to the card and changed the VR ,Quote:
And how does one change and monitor the voltage, like makaka did
Hello guys!
I am relatively new here but i have some experience on ocing though.Anyway today i added a 2nd 4850 1gig but for my bad luck,it was the sapphire DUAL SLOT and not the reference that i expected...(which i have pencil modded to 821/1200 along with a musashi cooler)
What i need is for someone that really knows this thread,to point me to the page of the pencilmod of DUAL SLOT sapphire 4850 if possible cos 64 pages are a bit hard to look into..!
Thanks in advance!!
You go here
http://www.xtremesystems.org/forums/...o_threadsearch (it is the "search this thread" function)
and then type in "Sapphire". ;) And then after a few minutes of reading you will probably find what you are looking for.
For the owners of the DUAL SLOT 4850 that vmod their cards,i d like to remind that the MEM VRMs should be cooled too!
I find that in both reference and custom PCBs the mem vrms are ignored but if u put a sink on them u llbe surprised how hot it gets!!
I put one in my reference and now in my DUAL SLOT for peace of mind!
I also added vMEM measuring points.
Hope to be of help here!:)
http://img35.imageshack.us/img35/5850/back1v.th.jpg
http://img41.imageshack.us/img41/7269/front1e.th.jpg
http://img12.imageshack.us/img12/1330/back2a.th.jpg
Hi All
Could you please help me and confirmed which resistor should I use 50K or 20K
this one?
http://img15.imageshack.us/img15/845...e4870vmod2.jpg
or this one?
http://img10.imageshack.us/img10/400...e4870vmodm.jpg
thank you
Tomasz25, the bigger VR You use, the safer it is. You have to measure def resistance to calculate the best value You could use...
Sorry to disagree with 1.), but that is not always true! As I already explained once or twice before, potentiometers tend to be highly non-linear in the lower resistance ranges. That means that for example when a 50K VR set to its max resistance and you want to have a a resistance decrease of ~5K, then you'll have to turn the screw more often than in case the VR was already preset to for example 10K before.
For vmodding a higher resistance rated poti with the same number of turns means having less precision for higher voltages. And that also increases the likeliness of killing hardware, due to overvoltage, as the resistance drops faster in the lower ranges.
It's always a tradeoff between precision in the higher voltage (lower resistance) ranges and higher default voltage with the variable resistor set to its max. A way around that "problem" BTW is using potentiometers connected in series.
The problem described aabove is the reason why the second part of your statement is the most important. ;)
celemine1Gig, yes ofcourse. You are right as usual :)
I just wasn't specific with my post. I meant for 24/7 "jump". If he has intentions to do extreme OC with high Vcore, then lower VR is more suitable, as You already said.
Thanks for your advices, I think I will start with 50K and I will see what results I will be able to get
Noob question but i was wondering,what would happen if,in this card
http://img35.imageshack.us/i/back1v.jpg/
whos PCB has 8pin connector design but instead only a 6pin is used,
someone soldered a 12v cable+a ground to each free spot.???
What would happen?
Should the card get more current?Overheat?Become more OCable???
it wont make any deference i think those pads are connected together.
you wont gain more oc it will probably drain more current but wont make a big deal
Tomasz25 use one 50k it will be more precise
Hello, can you please help me which resistor to pencil on the Gigabyte HD4850 (zalman, 512MB) ? I took some pictures, http://img56.imageshack.us/img56/8844/dsc04298.th.jpg http://img56.imageshack.us/img56/4900/dsc04301.th.jpg.
Thanks in advance!
Hehe, I know that you already knew and what you meant to say. It's just that I myself had to learn the hard way, killing some hardware before really starting to think about the problem. That's why I like to emphasize it, in oder to keep others from making the same mistake. I can tell you, you feel really dumb after having killed a graphics card's memory, due to overvoltage, just because you did't think about the effect, that I described. You then know that you could very well still have a fully functioning video card if you were not that dumb. The positive effect, though, is that you definitively learn it this way. :D