Re:Who is owning a GeForce 8800 GT, and ready for tweaking? - 2007/11/12 15:41metro wrote: It works at 1.5V, will upload the BIOS tomorrow and see what happens I will also modify it, I've read in XS that some guys claim 1.2V but they haven't showed real proof of the modification, no tester readings. Hi metro, are you saying that 1.5V is set in BIOS? Would be sweet if it works! I dug out my DMM and will measure reading on the board with 1.2V in BIOS... And euh Mavke, I did get registration email afterall. I saw your post on XS.
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Mavke
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Re:Who is owning a GeForce 8800 GT, and ready for tweaking? - 2007/11/12 17:36Great, yeah I am also interested by the BIOS, however I know that NVIDIA is not giving out the final production cards out on the NVIDIA editors day, so it might be a pre-sample which is quite different from the real GeForce 8800 GT and that is why maybe there is a difference in the voltage levels. So I am waiting for that BIOS to check it further.
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metro
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Re:Who is owning a GeForce 8800 GT, and ready for tweaking? - 2007/11/12 20:37Sorry 1.5V was a typo is 1.05V the real GPU voltage measured via multimeter, I already uploaded de BIOS. There are 4 VID's, VID 00, 01, 02 and 03, now on the voltage table I see options from 0.8V up to 1.8V to give to the VID 03 value. I'm about to flash my card had some issues with the detection of my new USB keycard.
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Mavke
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Re:Who is owning a GeForce 8800 GT, and ready for tweaking? - 2007/11/12 20:59metro wrote: Sorry 1.5V was a typo is 1.05V the real GPU voltage measured via multimeter, I already uploaded de BIOS. There are 4 VID's, VID 00, 01, 02 and 03, now on the voltage table I see options from 0.8V up to 1.8V to give to the VID 03 value. As I expected that is would have been a typo, and you just confirmed. A 65nm chip running at 1.5V would just kill the chip from by either overheating very fast or just to much power. And how many time I nee dto explain the logic of the VID's? So just to repeat again the NVIDIA based cards only look at the VID level not the voltage label you put next to it. So you can only select VID 00 upto 03 and those will only give 0.95V up to 1.10V in steps of 0.05V.
So to repeat VID 00 will always give 095V even if you change the label to 1.8V, as the NVIDIA power circuitry looks at the VID xx level the voltage you put next to it is purely a comment or label, nothing more than that and has no impact on the voltage at all. Just to make it clear once again...
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F@32
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Re:Who is owning a GeForce 8800 GT, and ready for tweaking? - 2007/11/12 22:39Yep, that what I thought about 1.5V. The GeForce 8800 GT has over voltage protection that kicks in at above 1.3V. I guess very little hope for other VID 04 for example. I don't want to voltage modify the card, and then keep it forever. I might replace it either with the G92 GTS or 1GB version of the Radeon HD 3870 depending on how well they overclock. Regards...
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NickDvB
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Re:Who is owning a GeForce 8800 GT, and ready for tweaking? - 2007/11/12 22:55I have an BFG GeForce 8800 GT OC edition, when I check my GPU voltage with a DMM it always reads 1.15V when overclocked with RivaTuner, is that the max I can get or is 1.2V possible? Also I can't get the memory stable above 1900MHz but I thought all the cards had chips rated at 2GHz, and many cards are factory clocked to this speed already, is it possible that some cards use tighter timings that limit the memory speed? I will try and get you the BIOS when I can find a floppy disk that works! Keep up the good work.
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Mavke
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Re:Who is owning a GeForce 8800 GT, and ready for tweaking? - 2007/11/12 23:14Well try the VID 03 which shoudl give 1.1V instead of 1.05V and that could be that during overclocking it would climp up to 1.2V, at least others have confirmed that 1.1V is possible and does increase the overclocking of the card.
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metro
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Re:Who is owning a GeForce 8800 GT, and ready for tweaking? - 2007/11/13 00:11Okay, well 1.1V worked perfectly it increased my overclock from 730/2070MHz with 1850MHz shader to 771/2070MHz with 1944MHz shader clock. Now RivaTuner reads the shader and core with steps, not linearly, who is right or wrong? The reading or where you set the clocks? I tried getting the VID related to more voltages but I got a yellow dot with a warning.
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cefurkan
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Re:Who is owning a GeForce 8800 GT, and ready for tweaking? - 2007/11/13 03:52metro wrote: Okay, well 1.1V worked perfectly it increased my overclock from 730/2070MHz with 1850MHz shader to 771/2070MHz with 1944MHz shader clock. Those are perfect clocks, I also updated my BIOS to go from 1.05V to 1.10V to increase the overclocking potential. My card was blocked at 694MHz and can now do 720MHz.
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skull_fc
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Re:Who is owning a GeForce 8800 GT, and ready for tweaking? - 2007/11/13 04:23Hi guys, I found this forum through XS, and I'm keen to find a good BIOS for my BFG GeForce 8800 GT 512MB OC edition. The card is currently with my friend while I'm out of the country, but he's flashed it for me using the BIOS revision posted for the BFG card on this thread. Unfortunately this lead to instability and the card doesn't really clock any better than before. He has managed to get the core up to 745MHz, whereas previously it only achieved 731MHz. It also returned poorer scores at stock settings than previous stock runs on Half-Life 2: Lost Coast, and 3DMark01.
Have you any idea what may be causing this? I'm keen to achieve a stable long term overclock on this card. I can upload the original BIOS too, but not until next week when I return. Any help or advice would be appreciated. Thanks again.
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