7900GTX Volt modded single Card results!!
- Thread starter maverik-sg1
- Start date
Highland3r
New member
Seem to be having issues with this card, tends to drop to 2d clocks under water (under ~ 32 load). Not hard to work around, just set 2d clocks as well as 3d. This may not be the "cold bug", need to look into it a little more. Certainly has the characteristics of it though
Afaik there are modded bioses out there though, so there shouldnt be an issue
For the price they're pretty hard to beat performance wise. Most if not all seem to be making GTX or higher clocks with some vmods. Hoping to pick another card up next week once they're back in stock!
Should have some more results in a while, OCP mod #1 appears to have done nothing!
Afaik there are modded bioses out there though, so there shouldnt be an issue
For the price they're pretty hard to beat performance wise. Most if not all seem to be making GTX or higher clocks with some vmods. Hoping to pick another card up next week once they're back in stock!
Should have some more results in a while, OCP mod #1 appears to have done nothing!
Highland3r said:
Well....if it still exits, I withdraw my previous statement!
When overclocking my cards, I always set 2d=3d, always have :eh: maybe thats why I aint seeing the bug. Started doing that as 3DMark03 always reported back the 2D clocks, so I guedded test 1 depended on the 2d clocks, so upped them.
Its not so much a "cold bug" it's more of a throttling that in there wisdom nVidia put into the BIOS of the 6800's and up. The 7800 BIOS with it removed was quickly made by someone on XS. I think I can mod the BIOS on the 7900's if it does exist, and by the comment of ~32 throttling sounds like it is still in there.
Why they do that is beyond me but it shouldn't be too hard to get rid of. Out comes the HEX editor again lol.
Can someone pull a BIOS file off a 7900GT for me and email it to my email in my profile please? Want to see if it is in there or not.
Cheers
Boardy
Why they do that is beyond me but it shouldn't be too hard to get rid of. Out comes the HEX editor again lol.
Can someone pull a BIOS file off a 7900GT for me and email it to my email in my profile please? Want to see if it is in there or not.
Cheers
Boardy
Highland3r
New member
boardy said:
http://xtremesystems.org/forums/showpost.php?p=1392090&postcount=3
The dump on there any use?
Well I managed to get hold of some Galaxy and XFX BIOS .rom files, and the results are very interesting indeed. It seems the Core Slowdown has indeed been taken out, but the core speeds are the most interesting of all.
I have 3 different XFX BIOS dumps, and all are unmodded and from the same batch of cards, yet all 3 have different stock clocks. Bit strange seeing as they are all identical cards.
As I see it, XFX are actually using GTX cores on the GT cards with half the RAM and a few pipes disabled. They mayb able to be opened with a flash to a GTX BIOS, who knows. If I get one of these cards, no prizes for guessing what I'm gonna be trying.
Boardy
I have 3 different XFX BIOS dumps, and all are unmodded and from the same batch of cards, yet all 3 have different stock clocks. Bit strange seeing as they are all identical cards.
As I see it, XFX are actually using GTX cores on the GT cards with half the RAM and a few pipes disabled. They mayb able to be opened with a flash to a GTX BIOS, who knows. If I get one of these cards, no prizes for guessing what I'm gonna be trying.
Boardy
Highland3r
New member
Interesting/good news re cold bug 
Managed to get this card up to 700+/950 so far on cool water, 1.45 vGPU/2.02 vMem. Seems to be REALLY sensitive to voltage though. Tiny amount either way can lead to Black screens and crashes.
The card also seems to hate volts, lowering vDD helps with memory clocks a little, and the core seems to struggle with over 1.47v
Mav, what volts are you running through yours at the moment?
Managed to get this card up to 700+/950 so far on cool water, 1.45 vGPU/2.02 vMem. Seems to be REALLY sensitive to voltage though. Tiny amount either way can lead to Black screens and crashes.
The card also seems to hate volts, lowering vDD helps with memory clocks a little, and the core seems to struggle with over 1.47v
Mav, what volts are you running through yours at the moment?
Highland3r said:Interesting/good news re cold bug
Managed to get this card up to 700+/950 so far on cool water, 1.45 vGPU/2.02 vMem. Seems to be REALLY sensitive to voltage though. Tiny amount either way can lead to Black screens and crashes.
The card also seems to hate volts, lowering vDD helps with memory clocks a little, and the core seems to struggle with over 1.47v
Mav, what volts are you running through yours at the moment?
ya right about the ram voltage i would leave it alone
as for the core try this 900 with 1.7v but with a pci-e of 124 use clock gen
Highland3r
New member
bazx said:ya right about the ram voltage i would leave it alone
as for the core try this 900 with 1.7v but with a pci-e of 124 use clock gen
Aye, anything over stock makes things worse, ~ 2.01-2.03 is the sweet spot it seems
Think the OCP will kick in again before then
900 core would be awsome to see though 800 *might* be do-able if the card responds to volts.Highland3r
New member
For kicks, had a play with vDD thismorning... Upping to 2.15 gave us 1ghz benchable on memory, with the core up at 620mhz (no higher due to stock cooling)
The limited runs we did were clean. Thats the highest we've had the ram with core speeds above 600mhz by some margin.. 640/920 artifacted a little yesterday, with 2.03v.
Between stock and 2.1v theres no response at all from the ram, doesnt seem to help clocks at all. Above 2.1 and we started to see an improvement.
The limited runs we did were clean. Thats the highest we've had the ram with core speeds above 600mhz by some margin.. 640/920 artifacted a little yesterday, with 2.03v.
Between stock and 2.1v theres no response at all from the ram, doesnt seem to help clocks at all. Above 2.1 and we started to see an improvement.
