8800GTS 512Mb (G92) vMods

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12-19-2007, 09:41 AM
K404

Quote:

Originally Posted by flytek

please explain this to me a little more carefully...i really don't like obviously voiding my warranty and if what you say is correct then a simple stripe of conductive paint accross the top the the relevant resistors would achieve the same removal of OCP.
to my thinking removing the resister will not be the same as bridging it...removed the circuit should be broken due to connections literally missing and therefor almost infinate resistence in those circuits disables the OCP...however bridging the resisters with wire or paint will result in almost no resistence being offered and the circuits will remain intact...

so how is bridging the resisters anything like removing them?

please excuse if i've misunderstood the intricacies involved here as i have no electronic background whatsoever..

if anyone can work out how to disable OCP without voiding the warranty i'll be very pleased
(at this point i'm also not sure if these GTS512mb cards have the same capability in terms of removing OCP will allow LN2 voltages without further issue)

Quote:

Originally Posted by T_M

I too was confused by that comment.

Quote:

Originally Posted by cowie

so how is bridging the resisters anything like removing them?
its not two different things
remove no current at all
short 100 current floqw
so im lost on that comment as well

Quote:

Originally Posted by jason4207

I think that if you decrease resistance by soldering another resistor (or Cu wire) in parallel you are raising the OCP threshold. OCP won't kick in until much higher current flows. If you get the right value resistor in there you can raise OCP, but still allow some level of protection (probably a good thing). Just soldering a Cu wire or using a conductive pen will raise the OCP threshold to a level where you probably will never have to worry about it anymore.

Removing the resistor completely removes OCP.

Both end up giving you the same result, but do it in different ways.

This is what I've gathered from all my readings on here and other forums as well some PMs w/ some very knowledgeable people. I also have a B.S. in Computer Engineering. :p:

I don't know this to be fact, but it seems to make sense. In any case take it w/ a grain of salt. ;)

Quote:

Originally Posted by Timbosan

No stop confusing people. If you remove the resistor, the circuit is broken, and the primarion contoller never gets a signal from that circuit to trigger OCP so OCP is removed. If you short out the resistors, you would increase the signal the primarion controller gets, by lowering the resistance, and most likely lowering the OCP point. The card may not even boot. Do not bridge the resistors.

oh **** Im so sorry for that- do not short the resistors! I was utterly wrong with that information. I removed my comment. :shakes:

half-assed excuse: it was very early morning and I would have been tired.
12-19-2007, 09:03 PM
Timbosan

Quote:

Originally Posted by jason4207

Sorry if I seemed OT, but it seems to me that a mod for the GT will be relevant to finding a working mod for the GTS-512.

If soldering the 2 resistors in parallel as I described works on the GT, then it would seem logical to assume that doing something similar on the 3 resistors on the GTS-512 would work as well.

where is this thread where he has soldered the resistors in parallel with the caps? i came up with the idea of removing the caps altogether, but never tried it, and n1ck r1mer thought of soldering VR's across the caps, but hasnt done it either (though we were talking about it concerning the G80 GTS)
12-20-2007, 09:22 AM
jason4207

It's not in a thread. John didn't want to post it online, so he sent it to me in an email.
12-20-2007, 09:39 AM
jason4207

Does anyone know if increasing vRAM voltage has any effect on the GTS-512? I know it had no effect on most GT's.

Also, how high can you increase vGPU before the OCP kicks in? I'm assuming it's a little bit higher than on the GT...maybe .05v higher? AquaMark3 seems to be a good test for OCP.
12-20-2007, 09:42 AM
187(V)URD@

Should be easy if you can overclock a graca like a cpu in bios.
12-20-2007, 03:03 PM
tomati

Quote:

Originally Posted by VETDRMS

EVGA 8800GTS-512 doing pretty well.

vGPU: 1.275v
vMem: 1.936

Core: 864
Shader: 2106
Memory: 1134 (2268!)

3DMark'06: 15,156 with E6600 @ 3.666

36C loaded.

:cheers:

Hi,

Are these the stock voltage of the evga 8800GTS 512mo ? or did you made the vmod for both ( gpu & mem) ?
12-20-2007, 03:10 PM
K404

stock voltages are 1.16/20.1V

(at least...they are for me!)
12-20-2007, 06:12 PM
VETDRMS

Quote:

Originally Posted by tomati

Hi,

Are these the stock voltage of the evga 8800GTS 512mo ? or did you made the vmod for both ( gpu & mem) ?

No, they are not stock voltages. I increased the stock vGPU and decreased the stock vMEM.

:up:
12-20-2007, 09:54 PM
tomati

Quote:

Originally Posted by VETDRMS

No, they are not stock voltages. I increased the stock vGPU and decreased the stock vMEM.

:up:

Ok thanks ,

do you remember what O/C do you hit on stock ?

I ordered one evga, hope to get it next week.
12-20-2007, 10:34 PM
VETDRMS

Quote:

Originally Posted by tomati

Ok thanks ,

do you remember what O/C do you hit on stock ?

I ordered one evga, hope to get it next week.

I never had the card stock, I modded it the day it arrived before installing it.. :ROTF:
12-21-2007, 07:16 AM
jason4207

Stock: I'm at 771/1944/1062 on my GTS-512 at 100% fan stable for at least 25mins in ATI Tool, and made it through 8 loops of Battle of Proxycon (3DMark03). I consider this stable.

16190-3DMArk06 w/ 450x8 (3.6GHz) x3210 Quad, P5K-Premium, 2GB RAM @ 1125MHz 5-5-4-10 --> (24/7 stable).

I haven't tried to test for stability at lower fan settings yet.
12-21-2007, 05:18 PM
ViperJohn

Quote:

Originally Posted by jason4207

Stock: I'm at 771/1944/1062 on my GTS-512 at 100% fan stable for at least 25mins in ATI Tool, and made it through 8 loops of Battle of Proxycon (3DMark03). I consider this stable.

16190-3DMArk06 w/ 450x8 (3.6GHz) x3210 Quad, P5K-Premium, 2GB RAM @ 1125MHz 5-5-4-10 --> (24/7 stable).

I haven't tried to test for stability at lower fan settings yet.

You should be fine with the GTS-512 at 1053 in 03 BoP. Also loop 3Dm05 Canyon Flight as well.
My GTS would do 1134 in 03 BoP but craps it's pants in Canyon Flight at anything over 1107
memory and in the same manner as the GT's crap out in BoP.

Viper
12-21-2007, 06:33 PM
Timbosan

Quote:

Originally Posted by jason4207

It's not in a thread. John didn't want to post it online, so he sent it to me in an email. I understand his concerns over in OCF

thanks ive got it sorted now, and similarly i wont be posting it lol. you can delete convo if you like.

:up:

I have found for the 320mb GTS, GT2 (firefly forset) in 05 & 06 to be the best test for ram artifacts. Also GT3 (canyon flight) in 05 is great for finding shader artifacts.
Reapeating nature in 03 is a good test for max gpu clocks, too high you will get lockups.
May also be the same for the G92 rev cards.
12-21-2007, 11:32 PM
jason4207

Quote:

Originally Posted by ViperJohn

You should be fine with the GTS-512 at 1053 in 03 BoP. Also loop 3Dm05 Canyon Flight as well.
My GTS would do 1134 in 03 BoP but craps it's pants in Canyon Flight at anything over 1107
memory and in the same manner as the GT's crap out in BoP.

Viper

I did 8 loops of CF in 3Dm05 w/ no issues at 771/1944/1062, so I guess that's one more test that is showing I'm good & stable at these clocks.

Now I just need to mod this thing, and see what it can really do!
12-21-2007, 11:41 PM
ViperJohn

Quote:

Originally Posted by Timbosan

thanks ive got it sorted now, and similarly i wont be posting it lol. you can delete convo if you like.

:up:

I have found for the 320mb GTS, GT2 (firefly forset) in 05 & 06 to be the best test for ram artifacts. Also GT3 (canyon flight) in 05 is great for finding shader artifacts.
Reapeating nature in 03 is a good test for max gpu clocks, too high you will get lockups.
May also be the same for the G92 rev cards.

Were the SMR's we talked about on the front of the GTS 320???

Viper
12-22-2007, 03:56 AM
Timbosan

Quote:

Originally Posted by ViperJohn

Were the SMR's we talked about on the front of the GTS 320???

Viper

not that i could find, directly behind (front side) the primarion controller are solid capacitors then a blank space until the edge of the heatsink obscures the board, and the power mosfets start. i cannot find them as yet. I do however feel the r/c circuit will work the same way as the G92 GTS & GT, the resistance across the 3 caps in question is 1.29k & the adjacent resistor is 78 ohms. im taking the card out tomorrow (been so busy havent got a chance) and probing around fully to see if i can find the smr's. i cant remove the HS though, as i dont have any thermal paste left, but im almost certain they would not be that far away. maybe the design of the px3540 differs from the px3544 in this regard, and there is only one resistor & one cap for each phase.
12-23-2007, 03:39 AM
VoRtAn_MaDgE

I modded my 8800gts 512 from gigabyte this morning.
Still missing vmem (does it really helps?)
Don't have the correct pot at my place.

Well...added a switch for on/off.

http://img143.imageshack.us/img143/6718/26806464og8.jpg
http://img148.imageshack.us/img148/1324/85440098cj9.jpg
http://img143.imageshack.us/img143/122/94285739tw0.jpg

Results later in the correct post for the efect.

Cya guys! ;)
12-23-2007, 09:08 AM
Pacha

edited
12-24-2007, 03:08 AM
scotty1991

What does the little power connector type wire do on these voltage mods?
12-24-2007, 08:52 AM
jason4207

Quote:

Originally Posted by scotty1991

What does the little power connector type wire do on these voltage mods?

That's just there to give a place to measure the voltage you are applying.
12-24-2007, 08:55 AM
VoRtAn_MaDgE

Quote:

Originally Posted by scotty1991

What does the little power connector type wire do on these voltage mods?

Correct.
The switch is just for on/off.
12-24-2007, 08:57 AM
scotty1991

Quote:

Originally Posted by jason4207

That's just there to give a place to measure the voltage you are applying.

Fair enough, just looked like a molex or pci-e connector to me and got me confused :D
12-24-2007, 09:13 AM
4Qman

MSI 730/1944 OC edition

Stock Voltages
Core = 1.13
VMem = 1.94

I am ATI tool stable at 800/1190 With these voltages and 3Dmark 06 stable 820/1200 STOCK AIR!

I think this is a decent clocking card or will be once Vmoded. :D
12-25-2007, 07:45 AM
T_M

Quote:

Originally Posted by ViperJohn

My GTS would do 1134

Interesting, got screeny?
12-27-2007, 07:59 PM
aussie-revhead

What are you guys doing for ram sinks ? Does anyone have a pic ? What aftermarket air coolers are you guys using ? I will be using a mcw60 , but am curious as to my alternatives .

Good work T_M and congrats to team-eva and team-au.

:up:

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