I wouldn't recommend the other side. how did you burn it? can you show a pic? did you clean the area before soldering?Quote:
Originally Posted by rym
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I wouldn't recommend the other side. how did you burn it? can you show a pic? did you clean the area before soldering?Quote:
Originally Posted by rym
if you broke the via where the vmod connects to, then your card is probably dead. if it still works i'd suggest you leave it alone and enjoy while it lasts. if you cant manage to solder to such a point i dont think you should do voltmods, no offense.
this point is the only spot on the back side of the PCB
ok, the spot is somewhat like a mushroom , the head being the part you see
[a dot]. that part came off leaving the stock of the trace going to where it goes on the other side. Actuallythe dot its a hole going through the card to the other side connecting to a pin on an blacksquare thingy.
[ controls voltage i think]so the the head gone, leaving a smaller dot. to small to solder to. the trace still works fine.. so does the card. I hope you under stand . I can draw a picture if your brains arent working .. just kidding..
surface before ----- after -
so i was able to get 900/1255 stable and artifact free using pencil mods. 1.41v gpu, 2.07v memory. i really like this card.
Quote:
Originally Posted by rym
I don't need a picture, I won't be reading your posts anymore, as W1zzard stated if you couldn't solder to a pad, V-mods aren't for you. this is probably the simplest spot to hit in the history of volt modding, it is in the open with much more room around it than just about any others.
Sorry man I didnt mean to come off like that..
Just look at this pic. the solderpad is gone.. where else can I solder on the back side ? I know how to solder. what else can i do here beside the gpu side of the card. Oh i must off pulled the wire a bit when tunning in my 100 ohm variable resister to below 50ohm .
the solder pad came off.
http://i284.photobucket.com/albums/l...Picture011.jpg
randy
I don't have a card available to test. run yours as it is for now and keep checking the thread. if others find an alternate mod place this thread is where it will most likely appear.Quote:
Originally Posted by rym
Hi,
if it is to be made possibly to more V-GPU by software, soon :confused: W1zzard ?
My result :rolleyes:
http://www.abload.de/thumb/06erlj4.jpg
you can only do the bios mod to around 1.2v but thats it. not more possible in software
THX :)Quote:
Originally Posted by W1zzard
I meant the HD4870 not the HD4850 :yawn:
Got my 4850's working happy now at 800/1075, not tried the mem mod yet.
Did some testing with these cards last night on 3D mark 06 , i ran the tests a few times with my cpu @ 3.8Ghz and as i clocked the cards over a certain point the scores started to get worse
Q6600@3.8Ghz
750/1050 = 20229
800/1075 = 21328*
825/1100 = 21199
850/1080 = 21103
Very odd, if thats the case then i might back down my 1.4v to 1.25 if its not getting me any faster speed.
I need to try it in some other games/test.
__________________
Same answer though. the max the 4870 will give you is 1.263 or so.Quote:
Originally Posted by J.D.
Can someone please tell me what is the actual (via multimeter) gpu voltage of the stock 4870 (with stock bios and no mods) @idle and @load?
Thank you!
Its been asked for a lot but never given, i think 4850's owners bought all the multimeters :rofl:Quote:
Originally Posted by SetteUltras
:rofl:Quote:
Originally Posted by Devious
Ι am a 4850 owner too... trying to decide if 1.2V @idle / 1.45V @load is safe for every day use (800/1100)
my 4870 measure 1.3v stock from factory..800/1050 the other 800/1150 one hit 875 on th gpu with 1.35v
Iuse stock heatsink but rev up the fan speeds/oc via bios.
Thanks, so 1.3v it is. Im not sure what you mean by the other with 1.35v.
1.35 with volt mod
Thanks
1.3v both idle and load out of the box?
Because 4850 idles 1.08v while on load is 1.15v
a few questions about this.
i have a 4870 and am confident i can do the soldering. but the smallest pot i have is a 1k ohm 15 turn .75 watt. i stuck it on my DMM and adjusted it down to 50ohm, its a little sensitive but i think it will work.
do you more experience guys think this pot will work, or should i order a different one?
Order a different one.
I also suggest a 5 ohm fixed resistor in series to keep from creating a dead short.
Hi guys,
are you sure that this vdcc measure point is right?
http://www.techpowerup.com/articles/...s/overview.jpg
I read 12.17 volt:confused:
I've find the measure point and correct the photoQuote:
Originally Posted by diablos
http://www.pctunerup.com/up/results/...0_overview.jpg
I read 1.285V idle / 1.3V ATI tool load (840/1050, Sapphire HD4870 stock bios with fan mod)Quote:
Originally Posted by SetteUltras
So around 1.3v it is. Good to know. Thank you guys both :up: :up:
i found that the sweet spot on my 4850 is 1.32 to the core,good for 865 in all my benchmark games and still runs cool e-nuff for 24/7 use on my as1 for cooling.
as a matter of factly it seems that it does not scale well with volts after 1.35,max clocks at 1.40v only modest increase to 885 from 1.32v 865.
even with temps 27c ilde 45c load
ok ty, i wasnt sure. thats why i asked. i've only done a few volt mods in the past.Quote:
Originally Posted by STEvil
i dont really understand most of what i'm doing with electrical componets, but i'm good at following directions. everyone i've tried so far have worked.
i did flash the bios on my 4870 with better fan speed, and increased the 3d voltage, but i dont think it worked. 830 on the core is still my max stable.
It seems the core has no problem surviving at 1.3-1.4v.Quote:
Originally Posted by cowie
The thing is whether or not the rest circuit (vrms etc.) of 4850 can handle such high voltage in the long run...
So there is a sweet spot for vMEM as well:
At EXACTLY 1.075v I am rock stable at 1200mhz:shocked:. Any higher or lower, and I cannot be stable. So the ram is capable, you just have to find the right voltage. Stability is checked by 1 hour Furmark, 6 loops of crysis benchmar, then 3 loops of 3dmark06. If no artifacts, I'm stable.
Also, it gets really hot at 1200mhz. I have some beefy heatsinks on it, and they still get pretty hot.
my system is roughly about the same as yours, well not much different n I had a FSP 550w 85% psu n that couldn't handle it so be wary mate :)Quote:
Originally Posted by LuxZg
i agree on the memory having a sweet spot, mine was at 2.07v as well, i can do 1225 and i don't get any artifacts in the benches i run.Quote:
Originally Posted by adpr_02
Yes thank you I was reading 12 volts also I was thinking my multimeter was bad for a little while.Quote:
Originally Posted by diablos
Yup. Just tried 1225 for the first time and it works great. Real glad about it. Time to try 1250... who knows, it might work.
That made me chuckle wesleyclark! :)Quote:
Originally Posted by wesleyclark
How are you getting on with the HD4850 moddin now?
I've bought myself a MM but at this point have no idea how to use it, however mine did come with a battery . . . I'm on a roll! :bounce:
P.S I love these XS animated icons :hrhr:
vddc reading spot fixed, the picture in the article now points to the correct location
Argh! :( Well, guess I'll just have to try it anyway, the hell with it!Quote:
Originally Posted by Jamesrt2004
Btw, could you give me some more info in what way it couldn't handle it? Didn't run at all, was crashing, or you just couldn't OC it?
As right now, I'm just looking at it WORKING out of the box with this PSU and CPU .. even if I'll have to lower CPU clock a bit (or a lot)
Tnx for the info anyway
What resistance should I be shooting for across the resistors for the 4870 MVDDC and MVDDQ pencil mods?
Is there a nother spot to solder to ??. the pad pulled off.
http://i284.photobucket.com/albums/l...Picture011.jpg
Quote:
Originally Posted by rym
you can still solder to that point... it just takes some extra steady hands. No you cannot solder to the other one you pointed to, as you can clearly see it is on a different microtrace
solder wont adhere to it since the spot is greatly reduced to solder to. from a grain of sand size now to a pin piont.
It is wrong again, look at thisQuote:
Originally Posted by W1zzard
http://www.xtremesystems.org/forums/...&postcount=524
thats basically the same spot, mine is just easier to reach imo
you need to scrape or use a solder sucker dealy to remove the flux that is on the board, there is a ton there i can see in the pic, flux wont let solder ever stick thereQuote:
Originally Posted by rym
So I'm reading up on volt modding in preparation for my 4850s' arrival. Are there any good reading sources for guides, etc.? I've read the VR Zone review here.
I'm still reading through this thread (LOL it's long), but I would like to know where the measuring points for the DMM are. I plan on finding the max OC on stock voltage with WC, diting the BIOS with RBE (I'm familiar with this...) and finding the max OC, then performing the pencil mod and finding the mac OC....
I have a cheap little soldering iron and a radio shack multimeter, but I'm not comfortable enough with the soldering iron to solder such small components without more practice.......however the radio shack DMM should suffice.
I was wondering. I did the vmem mod for the HD4850 with a 100K VR. The lowest voltage I can get is 2.10v , without the mod it's 2.04v After reading that there seems to be a sweet spot at 2.075v i want to redo the mod so i can get a lower voltage. Should I replace the 100K VR with a 50K VR?
I have the same question/problem with DemonEyez. We need 50K VR or 200K VR to achieve what we want? I think 200K VR , right?
If you haven't read this, you should ;) : http://www.xtremesystems.org/forums/...d.php?t=115387Quote:
Originally Posted by binormalkilla
You will need more resistance aka 150K to 200K ohm VR.Quote:
Originally Posted by DemonEyez
Under load in a few games it would just Restart that was all sometimes would do it sometimes wouldn't was kind of random but new psu = solved everythingQuote:
Originally Posted by LuxZg
Thanx for the info! :) Will pickup a new 200K trimmer this week. Crysis gives me artefacts at 1200MHz and 2.12v.Quote:
Originally Posted by babalouj
really want to try less voltage :P
Will a 100 Ohm vRES do for the HD4870 vGPU mod? It's a 15 turn so I reckoned it should be fine.
Thanks.. I hope I'll manage ti avoid it somehow. If not, well.. I'll have to voltmod by INCREASING resistance, so I have lower voltage and clocks (dooh! :shakes: :p:)Quote:
Originally Posted by Jamesrt2004
but of course :up: sounds good to me, some people have suggested soldering a 10 ohm fixed into the line before the pot to prevent any accident that may occur, i used 3 fixed 10ohm in series for mine because i prefer low matinence :yepp:Quote:
Originally Posted by alexio
if you have a stock 4850 heatsink thats intact i want it..
Randy
rym i have a spair 4850 sink..
also i could not resist i grabbed a 4870 as well. $274...:up::up::yepp::cool::p::D so now i need to find a nice 2x16x pcie mobo all i have is 16x 4x.
http://www.tigerdirect.com/applicati...1&sku=D10-4870
Arg, I did the same thing. I went out and grabbed an X48 motherboard, and the difference it makes in phenomenal.Quote:
Originally Posted by JamesBong420
I have a volt mod on my 4870, but I have a strange problem. I can bench on 850/800, and on 650/1150, but when I clock both the memory and core, the max I am stable is 800/940. VDDC is 1.307v idle and 1.363v load. I think it's OCP ( over-current protection ), but I'm not certain that is the case.
First mod on this new card, fan now runs 100% from POST to shut-down, perfect for air benching. Now 3DMark06 stable on default VGPU @ 875/1175 (AMD GPU Clock Tool) & 900/1200 3DMark01. I plan to do some BIOS overclocking this weekend, I'll keep you posted on the results.
http://img.photobucket.com/albums/v3.../R770_ffan.jpg
http://img.photobucket.com/albums/v31/canny/20597.jpg
I've seen that here, but I'm at work and it seems our routers are blocking something, as I see nothing in that first thread.....I'll check it out when I get home.Quote:
Originally Posted by r4st4m4n
iam going to pick up some 10ohm resistors tommorrow for 4870vgpu mod, but im not to sure which one i need, this is what they sell;
http://www.maplin.co.uk/Module.aspx?...C=SO&U=strat15
What increase in voltage will this achieve? thanks in advance
Hi, can you post some pics and share your configuration ( Ohm measurement)Quote:
Originally Posted by zbomb5610
Thanks...
To get 1.41v GPU, shade the resistor in the TPU article (the resistor, not the solder dots) to around 600 - 700, then modify the BIOS to get 1.263v at load (key in 1.263v under the clock settings), and... voila.
what resister to shade in tpu article for gpu ?a resister could be put in place instead right. Penciling is allowing more v thriugh the resister right.
remove the resister and what resister to put in its place ?
Penciling it means you are reducing its resistance. Anyway, first pencil mod here:
http://www.techpowerup.com/articles/...voltmods/151/2
my pics look just like the ones here (used pencil mods)Quote:
Originally Posted by sea_man
http://www.techpowerup.com/articles/...g/voltmods/151
i don't have any resistor or hard mods so no real point in putting pics of the card itself.
.6 resistance on the gpu resistor got me 1.41v load. 3.85 i believe on the memory resistor got me 2.07v load.
How much extra MHz are you boys getting out of the mem after vmodding? I'm up to 2300MHz effective and that's about as far as I can go and be stable. Worth modding the mem?
Why does the 4850 clock so much better than a 4870 ? Are very high clocks achievable in CF too ? I have seen mention of 1ghz on the core , wouldnt two of those crush a pair of 4870's (790/9xx) ?Quote:
Originally Posted by overcrash
:up:
2x HD4850 is much more powerful than 1x HD4870, but the 4850s in a pair cost a bit more. HD4850s aren't actually better than HD4870s for overclocking though. I've yet to test my second card but the first one does 870/1235 Furmark stable, so it should do mosts benches at 900MHz core. Everything is stock, but the fan runs at 100%. I haven't seen an HD4850 that benches at 900MHz with only 1.265v vGPU (stock 4870 vGPU). I'm not even talking about the DDR4940 memory :D The RAM needs more volts though because the card performs equal or worse above DDR4700 than it does at DDR4700.Quote:
Originally Posted by aussie-revhead
OK cool , do we have software yet that can clock these cards this high with CF enabled ? What are you guys using to clock so high ? (ie CCC only goes to 790 and the evga tool didnt support two clocked cards last time I tried).
Is there a pencil mod for 4870 ? Or solder mods only ?
:up:
I use AMD GPU Clock Tool 9.8. It should be floating around these forums somewhere but you can also just google it. For Crossfire I would recommend flashing the BIOS' of the cards to desired clocks if you want to go beyond the CCC limit. Overclocking cards in Crossfire could in theory work using the AMD Tool.
I tried AMD tool but it stuffs up with second card settings , it clocks one card but doesnt like the second .
Why does clocking from 750 to 770-790 seem to make no difference or even score less (with CCC) ? I dont think Im cpu limted that badly at 4400mhz .
Is it hard to flash the cards ?
:up:
You did select the 2nd device when you tried to OC the 2nd card?Quote:
Originally Posted by aussie-revhead
You shouldn't be CPU limited in almost any games/settings worthwhile with a pair of those cards. Can you give me some numbers? Like Crysis at high settings or the like. It sounds odd that the cards perform worse at a higher GPU clock.Quote:
Why does clocking from 750 to 770-790 seem to make no difference or even score less (with CCC) ? I dont think Im cpu limted that badly at 4400mhz.
No, but honestly I don't really trust the RBE BIOS Editor to mod BIOS'. I do it manually in a HEX editor. Flashing is simple if you look up how to make a USB stick bootable and read a bit about the basic commands of the flashing program. You can flash cards in Windows I think, but I use DOS because it is considered safer. Just make sure you get the latest ATIFlash and check if the BIOS you are trying to flash is 128kb in size and not 64kb.Quote:
Is it hard to flash the cards ?
:up:
I'm having the same issue my memory goes up to 1200 with core at 750 but I can get my core up to 880 with memory at 750. but something like 860/1000 is completely unstable. I'm trying to do the memory volt mod to see if I can get some sort of stability but I'm not sure about the memory voltage reading for vddc I read 1.5 volts. I have 1.47 volts on the core now. Its wierd though I can get 880 core and 1150 memory artifact free in ati tool but drivers crash in 3dmarkQuote:
Originally Posted by overcrash
i can have 885/1200 for crysis and furmark and 900/1200 for 3dmark 06,05,01 and 910/1200 for 03 with 1.45v, on air (accelero s1)
Yes and it gave an error about second card not suuported. I have seen this reported elsewhere too.Quote:
Originally Posted by alexio
Is crysis bench standalone or do I need to buy the game ? I have tested 3D06 and vantage but dont get anything worthwhile out of a gpu clock increase.Quote:
Originally Posted by alexio
Yeah I want to crank them up in software for benching then put them back . Maybe I have to revisit nvidia .Quote:
Originally Posted by alexio
:up:
Is that with a 4870 or 4850? If its a 4870 then our problems might be heat related even though gpu-z is reporting pretty good temps.Quote:
Originally Posted by revogamer
nevermind
sorry, yeah its a 4850 not a 4870Quote:
Originally Posted by keninishna
i booted up my voltmodded 4870 today and it works! yay :) so if anyone is looking for an example mod you can use mine posted earlier in the thread (link) i haven't tested voltage but it should be around 1.36v. ill have more pics and benches for you guys sometime in the next 24 hrs
cheers, SNiiPE
Anyone with a stock 4850 run furmark. I put my mcw60 on it plus ram sinks on the pwms and it won't last more than a minute at stock speeds. The gpu is at 33 idle 40 load. Any idea what could be the problem?
crashing furmark is a known problem for ati 38XX and 48XX series cards. It would be best to not use this as a stability test if you are experiencing these crashes. Some people with ati cards can run it fine but there are tons of people with the same complaint of it failing.
mine was topping out at 72 C for furmark then i just got bored and played CS
My PSU squeals loudly with both Furmark/ATITool and my overclocked 4850 eventually crashes to a black screen. Games, RTHDRIBL, Video Card Stability Test, 3DMark, and everything else run fine. There's something wrong there and since I don't play Furmark/ATITool, I just don't care.Quote:
Originally Posted by ibuycheap
Use a strong fan towards ram sinks and pwms. See if that happens again. I believe it wont.Quote:
Originally Posted by ibuycheap
http://img137.imageshack.us/img137/3984/hd48501hj3.jpg
3DMar06 HD4850 @ 650 /2200Mhz
http://service.futuremark.com/compare?3dm06=7556384
3DMark06 HD4850 @ 835/2000Mhz
http://service.futuremark.com/compare?3dm06=7549757
http://img71.imageshack.us/img71/3237/hd48502lw1.jpg
http://img125.imageshack.us/img125/1661/hd48503qm4.jpg
Jesus man, get some sinks on those voltage regulators before you blow the thing.
LOL you're not lying!Quote:
Originally Posted by Laykun
So I'm going to practice soldering some before I attempt the vGPU mod on my 4850s.....I have them flashed to 750/1125 with 1.2V (well I guess, haven't tested with DMM yet).
Are you guys using wire from spare SATA cables for volt mods? I've read that's good to use because they're so thin. If not SATA wire then what AWG? Thoughts? Suggestions?
I know this doesn't specify the number of turns, but does this look about right for the vGPU mod?
What are the good results of hd4850 overclocking on air, not for benching, but for 24/7 usage?
Fans wires are generally thin or I've also used some wire from an old case. The one used for the front panel connection.Quote:
Originally Posted by binormalkilla
Or you can always buy few meters .. ;)
http://img71.imageshack.us/img71/3237/hd48502lw1.jpg
E
33ºC Idle @ 840Mhz / 1.32V
http://img73.imageshack.us/img73/8360/h48504ui2.jpg
http://service.futuremark.com/compare?3dm06=7580874
39ºC @ 900Mhz / 1.45V Full
http://img242.imageshack.us/img242/1451/3d064850nu7.jpg
Yea I have no problem buying it, what AWG though? I have a bunch of front panel connectors.........I'll probably practice with the leftover stuff and buy some spooled wire.Quote:
Originally Posted by r4st4m4n
I put together a little blog guide thing of volt modding the 4850. It might help someone who is new anyway. Click here.
I managed to bench at 975mhz with an MCW60.
http://img368.imageshack.us/img368/3...1000hs9.th.jpg
Just finished vmodding the 4870 then... :D
http://img401.imageshack.us/img401/6...0172lu5.th.jpg
So... wonder how many volts it takes to kill these things?
You may want to sink those 8 black chips as well...Quote:
Originally Posted by Barr3l Rid3r
30AWG is what I use.Quote:
Originally Posted by binormalkilla
Hi,
actually i have 2 3870 in xfire, pencil vmodded and overclocked to 1012mhz, water cooled. Now i'm buying a 4870, and my purpose is to make pencil vmod and overclock it at the same freq (i want to broke the wall of 1 ghz :D), always liquid cooling it, of course. Do you think it's possible?.
Thank you.
How many volts did u use for 975Mhz?Quote:
Originally Posted by sandwichamwin
A vddc pencil mod for the 4870 would be possible?
Approx 1.42vQuote:
Originally Posted by Barr3l Rid3r
I just had a quick bench with the 4870. Seems like it doesn't like voltage as much as the 4850. Max on stock volts was 890mhz. Bumped the voltage by .1v and i hit 950mhz. Then not a single mhz more, regardless of voltage.
Anyone else experiencing similar things? Or have i just hit the limit of the card?
i will have some comparisons of my voltmodded 4870's (fixed 1.36v) in a few hours hopefully :)Quote:
Originally Posted by sandwichamwin
Hats off to ya.....excellent little guide :up:Quote:
Originally Posted by sandwichamwin