Please post 7900GT / GTX overclock results

[GoldenTiger]

Pandora's Box, you tried flashing the 1.4v BIOS and your temperatures rose, indicating the BIOS did indeed raise the voltage ? Just trying to clarify, thank you!

[Pandora's Box]

yes. i did flash with that modified bios. and my temps at idle rose about 10 degrees.

[Pandora's Box]

quick thought:

in that modified bios i see you have the core clocked at 500mhz with delta set at 50.

if i tried overclocking the card after flashing with that bios. say i tried 600mhz core, thats 650mhz effective right?

because when i tried that the system rebooted, now when i did the coolbits auto detect, it detected 560mhz, now with that delta, that would be 610mhz effective right???

[GoldenTiger]

Pandora's, that is how it worked with the 7800GT's , so as an educated guess, I would say you are correct on all counts.

Thanks for the response regarding the BIOS, I'm going to try it on my card and probably order an aftermarket cooler along with it to help the temps ! What utility did you use to flash the BIOS, and extract the original one?


EDIT: The 7900GT has the same mounting holes as the 7800GT, so a VF700-CU or VF900-CU would work, right?

[Pandora's Box]

well i reflashed to that modded bios with the 1.4volt in 3d mode however i took out the delta.

3dmark03 is currently running at 600mhz core 1800mhz mem. i am seeing tiny artifacts in the nature test so it looks like aftermarket cooling is definately going to be needed for 1.4volts on a 7900gt. the test passed at 580mhz and i scored 19997 in 3dmark03. pissed off that i didnt get to 20k i cranked the clock speed to 600 and we shall see what it scores....

[Pandora's Box]

Has to be the first 7900GT to get to 20000 in 3dmark03

[GoldenTiger]

Has to be the first 7900GT to get to 20000 in 3dmark03

Wow, super nice!

[GoldenTiger]

By the way, I have never editted a BIOS, either A) can someone tell me how to edit out the delta on the 1.4v modded one, or B) upload a copy of the 1.4v modded one without the delta ? I want to use it on my soon-to-be-ordered 7900GT with an aftermarket cooler.

[***Deimos***]

sli of course. just turned 9285 on 3dmaark06

http://i2.tinypic.com/r2tfus.jpg

The 7900gt seem to really shin on 3dmark06
remember this is at stock volts with only a 30 Mhz oc on the gpu.
hopefully the gpu will scale well with voltage ibcrease. vr should be here monday.

before you install vr, measure carefully stock volts for both 7900GT (running 3D like 3DMark2006 ofcourse), and please post here.

Also, cool if you could give "rough" resistance on variable resistor to get 1.36V (according to vr-zone stock for GTX)

thanks

[***Deimos***]

cronic i ordered a XFX 7900GT EXTREME 520/1500 default , and i didnt saw yet in no where any 7900GTs 3dmark 2005 scores at 1024x768 only saw scores at 1280x1024 , can you tell me +- how much 7900GT gets with default cloks at 2k5 default resolution? ???

http://www.guru3d.com/article/Videocards/326/15/

my thread - all the 3DMark2005 scores you ever need:
http://www.xtremesystems.org/forums/...54#post1328154

[***Deimos***]

They are all the same cards, based on the reference pcb of Nvidia 7900GT. Some manufacturers put their own stickers on the fans, but that's about only thing that's different about those cards.

edit: Get the one that's cheaper cos I don't think there's that much difference in overclocking.

Re Zalman.
I think if you endevour in overclocking the 7900GT (and especially if you voltmod, software or hardware), an aftermarket cooler is a must. The stock HS is tiny.

Re cherry-picked
Now this is all speculative, but based on typical normal distribution. There are 2 interesting things about 7900. No model with pipelines disabled (good yields), and big range of clocks with three big groups: 650-700 (higher voltage), 520-560, 450-475. lets call these groups, A, B, C. I think it would be too time conuming and complex to bin for exact clockspeed of model shipped so, here's what I imagine.

Possible binning process:
get chip out of big magic bag. test at 720Mhz with higher voltage, and if passes put on "A" pile. If fails, lower to 7900GT nominal voltage and try at 580Mhz. If passes put on "B" pile. Finally, try 500Mhz, because not all GPU are super-stars

Since relatively few ~700Mhz models will be sold, if there is shortage of chips, you can use from "A" pile for "B" (retest at lower voltage!), and from "B" pile in "C". So if you're getting a 7900GT, I think its good to get an "OC" model.

Worst case its only a few bucks more. BUT, if you get plain 450Mhz version, and you can only oc to 470Mhz, you will be really angry at yourself you didn't spend only few dollars more.

"normal distribution"
http://www.fao.org/docrep/W7295E/w7295e04.jpg

EDIT:
Pandora Box, set your delta to what gives you best results.. try 50, 20, 0. At the highest stable clocks, which gives you the higest 3DMarks - > go with that one.

[Gorod]

PNY VCG7900XXWB Geforce 7900GTX , 650/1600 Def.

With stock cooling : 722/881MHz

[DesertShooter]

Has to be the first 7900GT to get to 20000 in 3dmark03

Your score is low: 20159 @ 530/1440

Nice mem clock btw , XFX Extreme??

[Kenetixx]

PNY VCG7900XXWB Geforce 7900GTX , 650/1600 Def.

With stock cooling : 722/881MHz

Stock cooling OMG thats insane clocks there , Nice job

[DelaMaris]

I have one question...

Does XXX and SUPERCLOCKED cards (XFX, eVGA) have higher potencial overclocking?

So I can buy eVGA for 299$ and overclock it on SUPERCLOCK frequency and higher? There are no differences between normall and SUPERCLOCKED right?

[kiwi]

DelaMaris:

No, I don't think so. Usually higher grade cards have higher OC potential. Ofcourse not always but very often. Same with cpus, memory and other hardware.

[eva2000]

i think this time round they might be more aggressively speed binned given the numerous offerings at different rated default clocks - so probably the higher rated ones will clock better

but we don't know the conditions under which these video cards were rated either

[M@tt]

Just search on the ORB... Your 3DMark06 SM2/SM3 results are on par with "about stock" 7800GTX 256MB Let me dig out few examples again...

EDIT:To compare with your 7900GT, here are some results with a single 7800GTX 256MB:

http://service.futuremark.com/compare?3dm06=156370 - 2013/1952 @ 486Mhz/1316Mhz
http://service.futuremark.com/compare?3dm06=160574 - 2080/2050 @ 450Mhz/1410Mhz
http://service.futuremark.com/compare?3dm06=113677 - 2122/2036 @ 450Mhz/1323Mhz
http://service.futuremark.com/compare?3dm06=147209 - 2112/2031 @ 450Mhz/1260Mhz
http://service.futuremark.com/compare?3dm06=87801 - 2109/2034 @ 556Mhz/1331Mhz

Something is off with your clocks then

I apologise, your right, that memory was not taking, I will remove the picture as it’s misleading

[alexio]

well i reflashed to that modded bios with the 1.4volt in 3d mode however i took out the delta.

3dmark03 is currently running at 600mhz core 1800mhz mem. i am seeing tiny artifacts in the nature test so it looks like aftermarket cooling is definately going to be needed for 1.4volts on a 7900gt. the test passed at 580mhz and i scored 19997 in 3dmark03. pissed off that i didnt get to 20k i cranked the clock speed to 600 and we shall see what it scores....

Nice

So did the bios actually improve your maximum overclock?

Here are 2 new biosses with a 20mhz delta clock so you can really determine if you can overclock higher than before. The first is a 1.3v bios and the second is a 1.4v bios. With the stock cooler 1.3v might be a better choice.

I'd like you to test the difference in temperature at the same coreclock with the 1.2v stock bios, the 1.3v bios and the 1.4v bios.

1.3v bios 20mhz delta:
http://rapidshare.de/files/15329733/...delta.rom.html
1.4v bios 20mhz delta:
http://rapidshare.de/files/15330116/...delta.rom.html

Good luck with it
If it really works then it might also be possible to get 1.5v at a 7800GTX 256mb

[M@tt]

Real Overclocker

XFX Geforce 7900GT 256MB Basic model Partcode: PV-T71G-UDFR (£207 delivered)

Defaults are 470 / 685

BIOSTAR TForce6100-939 (£60 M/Board)







I will be off now and carry on crunching Rosetta

[jVIDIA]

UAAAUU 1800 on the mem's !!!

No mods and stock cooling ?

[M@tt]

UAAAUU 1800 on the mem's !!!

No mods and stock cooling ?

All Stock, but I was trying

[***Deimos***]

Nice

So did the bios actually improve your maximum overclock?

Here are 2 new biosses with a 20mhz delta clock so you can really determine if you can overclock higher than before. The first is a 1.3v bios and the second is a 1.4v bios. With the stock cooler 1.3v might be a better choice.

I'd like you to test the difference in temperature at the same coreclock with the 1.2v stock bios, the 1.3v bios and the 1.4v bios.

1.3v bios 20mhz delta:
http://rapidshare.de/files/15329733/...delta.rom.html
1.4v bios 20mhz delta:
http://rapidshare.de/files/15330116/...delta.rom.html

Good luck with it
If it really works then it might also be possible to get 1.5v at a 7800GTX 256mb

thank you very much for contributing.
I hope we can get lots of folks to contribute voltage scaling results (ex. max gpu at 1.2V, at 1.3V, at 1.4V)

I just realized something obvious. 1.4V for 7900GTX on 90nm. Didn't 6800 ultra on 130nm also use 1.4V.. whatever happened to voltage scaling? (Aren't the X1900's at like 1.1 or 1.2V?)

[alexio]

thank you very much for contributing.
I hope we can get lots of folks to contribute voltage scaling results (ex. max gpu at 1.2V, at 1.3V, at 1.4V)

I just realized something obvious. 1.4V for 7900GTX on 90nm. Didn't 6800 ultra on 130nm also use 1.4V.. whatever happened to voltage scaling? (Aren't the X1900's at like 1.1 or 1.2V?)

I noticed that too, but let's not forget that there was also an Ultra extreme out that had 1.5v at stock and the X1900's run very hot. But I have to admit that Nvidia is really pushing it with the vcore they use with the 7900GTX because they don't run much cooler than the 6800U's.

It could be true that Nvidia has yield problems with the G71 and because these chips run cooler than the 7800 cards they decided to push it a little.
But don't be happy about this as the RMA rate is part of the price you pay for the cards. This could also explain the big price difference between the 7900GT's and 7900GTX's.
ATI warned us about this in one of their slides regarding the 1.5v setting at 7800GTX 512mb's, but they should shut up as they offer only 1 year warranty themselves

And I just thought about something else. The 7900GTX is only 1.36v atleast so says Shamino. This means the voltage is not THAT high compared to the 7800 cards.

[dqniel]

Would the most accurate way to test voltage scaling be by determining max overclock at 1.2v, 1.3v, and 1.4v all with a 20mhz delta on the bios? What's the stock bios's delta?