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X1900GT Rev 2 Voltage Mods

Yea Easy Mod

Written by Shamino and filed under Guides > GPUs & Graphic Cards
Published on October 14, 2006, 7:27 pm

Source: VR-Zone

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Alright so you want to voltage modify your X1900GT Rev2, with that new cooler, changed PCB? No software voltage adjustments? No worries, here's some simple mods for you, all the way up to 1.85v!

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Comment by: Freeze on 07-Oct-2007 5:54 pm

Quote:

Originally Posted by ruffy91

The original resistance is 10,9k ohms.

Hi all

I need to put two capacitor loose when i try to cool the VRM at my X1900GT rev 2
Anybody knows the value of them? If you know please say me

The capacitor are C53 & C3010 near the VITEC chip regulator. Thank you very much

Comment by: ruffy91 on 26-Jun-2007 2:15 am

The original resistance is 10,9k ohms.

Comment by: Shamino on 23-Jun-2007 2:01 am

Quote:

Originally Posted by Spacehead

I accidently got R3066 removed. What should I use to replace it? Vgpu is 1.37V now, and 3D crashes (because the missing resistor?).

get some user to measure the resistance for u, its so long agao, i tink its a 10k ohms? and replace it with 10k or whicever

Anyway, here's my bottom line gut feel towards these reference designs: the jump from 6 phase power to 2-phase power seriously undermines the capacity, and that is the main bottleneck for this mod, a hardware limit.

Comment by: GohanCZ on 13-Jun-2007 11:02 pm

i Have a problem with Radeon X1900GT..when i play game(10-15 mins) The screen goes blask saying No signal, i have to turn off and than turn on P..This happens if i play Oblivion, TMNT or Hitman: Blood money. When i play Lineage2 it does not lost signal...Does anyone know sloution or can give me advice how to fix it?

Comment by: Shaake on 22-May-2007 3:24 am

I just couldnt make it work

The resistence keept going up and down and after 2 hours i got tired of it.. So no vmod here :/

Shake

Comment by: Shaake on 15-May-2007 11:15 pm

Anyone?

Comment by: Shaake on 13-May-2007 10:19 pm

The solution to the stable problem:

So I have done the voltage mod and I had some problems, but now it's solved.
When penciled the ressitor down to 6k ohms and then run on 1.35 volts after few minutes i lost the signal. I had to pencil it down again because it was higher then 6k this happend all the time I had higher or lower ressittance after lost of signal.
The solution was not to pencil all again when I had lower ressistance but to just move on the res. a bit with the multimeter electrodes (hard to explain in english, but no penciling the socond time) and so carfully increase the ressistance till app. 6k ohms, after this I am running since 3 days on 1.35 volt I went from 570/840 to 640/840 and I can go up to 680 but with stock cooler it is immpossible to cool the card, because i can run without artifacts till 78C but after this temperature my winxp freezes.

Posted by another guy here in this thread

All i wanna know is if the mod will kill the card in the long haul? And do you need skills to make the mod?

What was the std V on the old X1900GT rev.1? Isnt it the same core?

Shake

Comment by: ruffy91 on 13-May-2007 9:04 pm

The vmod isn't stable, you'll get a black screen, i don't know anyone who has managed to successfull vmod this card.
But just try it, maybe its stable if you also watercool the digital pwm, it gets really hot.

Comment by: Shaake on 13-May-2007 5:45 pm

Hey...

I now its an old thread, but ill give it a try

I have an X1900GT rev.2 running at 567mhz core, and 820mhz mem... Its begining to fall behind in games such as Stalker... BUT i have no money pt to opgrade

But on the other hand, i have water cooling on my X1900GT rev.2.. So why not bunk up the core speed a 100 or 150mhz ;D

First ill ask:

Have anyone with the GPU mod and OC had problems with it in the long term? Dos the core die in the long haul?

Second:

I´m a real newbie at these modding things, i´ve never done one before, but i can get the multimeter and stuff so...
Would it be to risky for me to try to do this mod?

I hope you´d answar eventhoe its an old thread

Shake

Comment by: Mallet on 28-Feb-2007 3:09 pm

I modded a reference pcb by saphire, and the vrm's are handling 1.43 volts. it increased my overclock from 595mhz to 675mhz. I am using only a Zalman vf700-cu, with the ramsinks, (core temps peak around 63C)also I superglued some aluminum heatsinks to the VRM's. i cut them narrow so they didnt short out other components. they get VERY HOT, but are stable somehow, maybe the zalman fan cools them slightly?\

http://service.futuremark.com/compare?3dm06=1235943

Comment by: unsmart on 26-Feb-2007 12:14 am

I don't know if anyones still watching but I got a non ref x1950pro[ jetway] and I'm looking for some help with a OCP /Vgpu mod for it. I have the data sheets for the PWM ICs but really not know what to do with them. this is a link to the post if anyones bored

http://forums.vr-zone.com/showthread.php?t=131247

Comment by: Mallet on 08-Feb-2007 4:58 am

Saphire x1950pro @ (670/1647) using Vcore of 1.42V

http://service.futuremark.com/compare?3dm06=1235943

Comment by: Mallet on 04-Feb-2007 3:26 pm

Has anyone found a way to raise the Vmem on these cards (1900GTrev2 and x1950pro)?

My defaults are Vcore-1.24V and Vmem 1.84V

Comment by: marvelous211 on 16-Jan-2007 7:10 pm

I have the sapphire 1900gt Rev. 2... It has the Pulse chip instead of Videc chip...

I did the mod using a variable resistor. It's reading 5.94k ohms..

Voltage increased to 1.32 volts from 1.12volts...

My overclock speed before mod is 580/800... And anything over 600 would VPU recover back to stock speed because of low voltage.

After the mod I tried 640 and it clocks fine but when I check for artifacts my screen turns blank and I need a complete power off from the back of the power supply to get into windows again...

I don't know what the deal is... Anybody try the mod on the Sapphire with Pulse chip?

Comment by: marvelous211 on 16-Jan-2007 7:02 pm

Quote:

Originally Posted by Spacehead

I accidently got R3066 removed. What should I use to replace it? Vgpu is 1.37V now, and 3D crashes (because the missing resistor?).

I think you're screwed...

Comment by: Spacehead on 08-Jan-2007 4:29 pm

I accidently got R3066 removed. What should I use to replace it? Vgpu is 1.37V now, and 3D crashes (because the missing resistor?).

Comment by: ownage on 08-Jan-2007 1:11 am

My x1900GTrev2 has 1,13vgpu.
From what i read the card becomes unstable above 1.3vgpu.
The voltmod allows minimum of 1,135vgpu, but isn't there a mod for using 1,25vgpu?
What is the difference between x1950pro and GTrev2 with voltage?, the x1950pro has 1.25vgpu i believe, but whats differend on the card?
I tought OCP could be disabled with Omega Drivers

, maybe that will help.

Comment by: Spacehead on 04-Jan-2007 10:16 am

So That Resistor needs to be exactly 5.9kOhms so OCP doesn't kick in?

I get black screen with 1.44V

Comment by: yantronic on 30-Dec-2006 3:52 pm

Quote:

Originally Posted by unsmart

sorry yantronic, I didn't mean to imply you would post unstable results. I was just wondering if the card was still modded an if it showed any problems in the month since the article was posted due to long term overvolting. I did read the full article and was just trying to figure out how you got the same results with different steps and if it was because of it being a x1950pro. The GT mod states "This must be done before any voltage adjustments below!! " and your x1950pro mod calls for it only over 1.6v. I didn't want to mess with the resistor if not necessary[ I'm only looking for 1.40v tops] as it appears to be a problem for most on this thread. It seems you an others are advising against this mod so I may just sell the card.

It's alright, we're all fustrated hardware enthusiasts when it comes to nasty designs like that.

Hope I haven't offended you in any way.

Cheers!

BTW for those looking at cooling the VITEC inductors, please take care of the 2 rectangular ICs above them FIRST, for the simple fact that the 2 are MOSFET/PWM Driver stages that run way hotter than the VITECs themselves.

It's been a couple of months, anyone been playing with the non-refs?

Comment by: Praxis1452 on 30-Dec-2006 3:57 am

VGPU mods. I'm wondering about memory hard mods.

Comment by: unsmart on 30-Dec-2006 12:23 am

It's the same chip[ dual inducers] dif maker, the mods still the same.

Comment by: Praxis1452 on 25-Dec-2006 6:40 am

Quote:

Originally Posted by db87

I Helped Ownage yesterday with the vmod.
The voltmod did work, we could easly hit 600MHz+ on the core.

But we ran in one (big) problem; After 2min of ATitool "Scan for Artifacts" we got "no signal input" on the screen. At first we thought did must have been the 6K pencil resistance wich should handle the overvoltage protection. The resistance maybe (because of heat) did change a bit indeed. We did pencil it down for 5,95K but afther the first check-up it measured 6,24K. The next test session went the same, pencil it down to 5,98K and afterwards testing (and blank screen @ ATItool) it was 6,xxK again. Saying that it did use a normal reagular HB pencil instead of a more softer 2B pencil wich should probably get a more solid resitance.

Although this little deviation I discovered a even more reasonable explanation for the black/blank screen issue; The Digital-VRM (VITEC chip) get extremely hot. After the second check-up i did put my finger on the VITEC chip to get an indiction of how how the chip got...
With a reflex i put my finger back it was EXTREMLEY hot, for sure it was 100degree or maybe even hotter. Ownage, the owner of the card told me allready when I asked him about "hot spots/hot mosfets" that the VITEC got I little warm but I have done a lot of voltmods but I never got a "electric management supply" of the PCB that extremly hot. This VITEC chip could have been toasted. This maybe explained why mid-range cards do have Digital-VRM and the high-end cards don't at the moment, maybe because Digital-VRM is not the best solution for high-end cards like XT(X) series wich consume about 125watts of power. I think there's a little margin of the wattage this VITEC chip can handle.

The VITEC chip in question:
http://i99.photobucket.com/albums/l2...digitalVRM.jpg

So for the thrid testing session we put a 8cm FAN with quite some airflow straight on the back-end of the card with tape so the FAN is putting airflow against the VITEC chip to cool it down. So resitance check-up and card back in. We played the game Just Cause and NFS MW for about an hour with no problems but clocking the core to 600MHz and "scan for Artifacts" with ATITool just resulted in a "No signal input" afther about 2min.

This all was tested in my system. I told him (Ownage, owner of the card) that he should put some heatsinks on the chip and the backside of the card en put some sufficient airflow on the VITEC chip. Because yesterday evening we did the voltmod en some little testing we didn't got the time to put his card under a big test of the issue I wrote above. He will test his card in his own system with some more time. So you will stay tuned, this is just the beginning offcourse.

Also check Ownage his updates here

@Ruffy91 what are your results? And what kind of cooling are you using?

I have a Pulse chip instead of the Vitec... Anyone else have the same?
Also any memory hard mods?

Comment by: unsmart on 21-Dec-2006 11:35 am

Thats why I'm unsmart among other things.
Good luck again

Comment by: Praxis1452 on 21-Dec-2006 6:14 am

Quote:

Originally Posted by unsmart

You set the multi meter to ohms and put a probe[ can be red or black ] on each solder joint of the resistor. The meter sends some voltage in one end and measures the differences at the other. http://mechatronics.mech.northwester...ultimeter.html
I highly recommend getting some help but thats up to you.
Good luck and post results please.
Do you have a x1900gt or a x1950pro? I figured you have the GT because the price you listed. you do know you will need a x1900 CF card to run Gts in crossfire.

You don't. This has been unlocked for atleast 2 or 3 months. Ever since the X1950XTX's came out this has been unlocked in CCC. Too bad I can't use Tray Tools anymore. Need CCC to run crossfire.

X1900gt anyway. I'll just get a multimeter and do the pencil mod. If it doesn't work then I'll run them at stock. Their CF performance should be good enough that I won't actually care. Be a tiny bit dissapointed however.

Comment by: unsmart on 20-Dec-2006 10:50 pm

Comment by: Praxis1452 on 20-Dec-2006 9:28 am

ok so I get mostly everything then except how do I measure the resistance?

Comment by: unsmart on 20-Dec-2006 9:13 am

Don't have power to the card when doing the mod. The only time you need power is to check VGPU after the mod. Most people who did this successfully have used solder with a variable resistor and heat sinks applied to the Vreg. If you are not sure of your skills you may want to take this to a TV or other electronic repair shop and have them show you on one first. I'm sure they would for a few bucks. I suck real bad at soldering and thats one of the reasons I'm leaving this one alone. The other is the people who started the thread seem to advise against it.
I assume you have the sapphire x1900gt[from newegg], thats the same one I have. The performance on the rev2s is 5-10% worse then the original GTs and they have no temp monitoring. I crammed[ had to change psu to fit] it in my htpc case today and video looks so much better then the NV6200 that was in there before. I'm glad I kept it now.

Comment by: Praxis1452 on 20-Dec-2006 8:28 am

Quote:

Originally Posted by unsmart

I'm probably to late but newegg has the x1950xts for $249, I would take one x1950xt over two rev.2 GT's. Less power, less heat, better overclocking and NO VMOD

I'm sure Gt's in CF would come out on top in most games though. I can't stand my GT so it's going in the family comp for the vivo features and I'm get a xt next month for me.

Maybe. I've never volt modded before so I'd just need a walkthrough. I plan to get a Digital Multimeter as I'm assuming that's what you would use to measure the ohms resistance. How exactly would you power on the card? In your system then do the pencil mod down to 5.9ohms? or with the green wire and it hooked up to your system. Anyway I've already received them hehe. Nice coolers actually. Copper or atleast it looks like it and Crossfire comes close to the 8800GTS. I've always been about performance.

so digital multimeter

conductive pen

and pencil. That about it for this mod? I've never done soldering so I'm not going to attempt it on this card.

Comment by: unsmart on 20-Dec-2006 12:33 am

Quote:

Originally Posted by Praxis1452

Well I should be getting two of these in a few days. I'm in the US and at $270 for both+ 7% tax it was too good to pass up. Hopefully I can volt mod these easily enough. How exactly do I measure the resistance? With a multimeter? I'm new to this heh. Anyone know the exact reason why the pencil mod keeps wearing off?

I'm probably to late but newegg has the x1950xts for $249, I would take one x1950xt over two rev.2 GT's. Less power, less heat, better overclocking and NO VMOD

I'm sure Gt's in CF would come out on top in most games though. I can't stand my GT so it's going in the family comp for the vivo features and I'm get a xt next month for me.

Comment by: Praxis1452 on 19-Dec-2006 11:58 am

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