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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  |
| The original resistance is 10,9k ohms. |
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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. |
| 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? |
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 |
| Anyone? |
| 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 |
| 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. |
| 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 ;DFirst 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 |
| 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 |
| 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 |
| Saphire x1950pro @ (670/1647) using Vcore of 1.42V http://service.futuremark.com/compare?3dm06=1235943 |
| 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 |
| 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? |
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| I accidently got R3066 removed. What should I use to replace it? Vgpu is 1.37V now, and 3D crashes (because the missing resistor?). |
| 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. |
| So That Resistor needs to be exactly 5.9kOhms so OCP doesn't kick in? I get black screen with 1.44V |
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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? |
| VGPU mods. I'm wondering about memory hard mods. |
| It's the same chip[ dual inducers] dif maker, the mods still the same. |
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Also any memory hard mods? |
 Thats why I'm unsmart among other things. Good luck again |
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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. |
| 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. |
| ok so I get mostly everything then except how do I measure the resistance? |
| 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. |
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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. |
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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. |
| 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? |