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Old 12-15-05, 06:00 PM   #1
nVidiaGuru
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Default BIOS MOD: Flash your 7800GT to 1.5v

I found this little mod last night while surfin and had to let everyone know. Easiest 30mhz core\100mhz mem gain I ever had. I wrote a little guide to show how its done, I take no credit for the mod itself.



Author of this mod "Dr.Leary" over @ xtremesystems.org
--- Original Post---
http://www.xtremesystems.org/forums/...ad.php?t=81441


*** All files and BIOS flash guides can be downloaded/viewed at www.mvktech.net ***



***::::WARNINGS:::: Do this mod at your own risk! This mod does require you to flash the BIOS of your 7900GT! This does and will VOID your Warranty! This ONLY works for the 7800GT model, Does not work for the GTX! There is a possibilty of damage to your card! Raising the voltage can shorten the life of the card! Do this procedure at your own risk!***



1. Download BIOS File and NBiTor version 2.6

2. Open NBiTor v2.6

3. Go File > Open BIOS > Locate the BIOS file your modifying and open

4. Select "Device" drop down box and select "NVIDIA PCI-E Series GPU"

5. Go File > Save BIOS and save

6. Go File > Open BIOS > Locate the BIOS file again and open

7. Select "Device" drop down box and select "NVIDIA PCI-E 7800 GT"

8. Click on "Voltage" tab and then press "OK"

9. Tick the box next to "Extend Voltage Table" and then press "OK"

10. Under the "Exact Mode" tab drop down the "3D" Tab and select "1.5"

11. Switch over to VID mode and make sure there are not any "?.?" listed as numbers

12. Go File > Save BIOS and save

13. Load the BIOS onto a floppy with your flashing method of choice and flash the BIOS
(BIOS flashing guides can be found @ www.mvktech.net )

14. Enjoy!

***And here is a connect the dots pic of the NBiTor steps***
http://img393.imageshack.us/img393/9...voltmod3zg.jpg
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Old 12-15-05, 06:06 PM   #2
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Default Re: BIOS MOD: Flash your 7800GT to 1.5v

Remember the 6800GT? People were getting failing cards left and right because of voltage mods.

The Vreg's on the 7800GT or 6800GT just aren't designed to take that much voltage, and sometimes they shortly fail.
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Old 12-15-05, 09:43 PM   #3
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Default Re: BIOS MOD: Flash your 7800GT to 1.5v

Quote:
Originally Posted by jAkUp
Remember the 6800GT? People were getting failing cards left and right because of voltage mods.

The Vreg's on the 7800GT or 6800GT just aren't designed to take that much voltage, and sometimes they shortly fail.


Complete bull****. The 7800gt is WAAAAAAAAAY better with voltage than the 6800 was. This one can go from 1.4v to 1.7v and still won't choke. People with propper hardware mods are hitting 10000 3dmarks05s across the board while people with simple bios and pencil modds are hitting 8000-8500 marks. The only person I knwo of that messed up their card is me (and I know lots of ppl. who did the modd) and I didn't mess it up because of the modification. I effed it up when I put it back in my pc. Here's a beter forum for vmodds. Read over it. It has complete instructions of everything there is to know.


http://forums.vr-zone.com.sg/showthr...=35085&page=18


Eddit: My videocard is fixable... I just need to find a propper value resistor.
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Old 12-15-05, 09:52 PM   #4
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Default Re: BIOS MOD: Flash your 7800GT to 1.5v

whats the stock voltage of a gtx?
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Old 12-15-05, 11:08 PM   #5
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Default Re: BIOS MOD: Flash your 7800GT to 1.5v

i agree with jAk. A GT is a GT for a reason and its at 1.4volt for a reason.
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Old 12-15-05, 11:10 PM   #6
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Default Re: BIOS MOD: Flash your 7800GT to 1.5v

Quote:
Originally Posted by adpr 02
Complete bull****. The 7800gt is WAAAAAAAAAY better with voltage than the 6800 was. This one can go from 1.4v to 1.7v and still won't choke. People with propper hardware mods are hitting 10000 3dmarks05s across the board while people with simple bios and pencil modds are hitting 8000-8500 marks. The only person I knwo of that messed up their card is me (and I know lots of ppl. who did the modd) and I didn't mess it up because of the modification. I effed it up when I put it back in my pc. Here's a beter forum for vmodds. Read over it. It has complete instructions of everything there is to know.


http://forums.vr-zone.com.sg/showthr...=35085&page=18


Eddit: My videocard is fixable... I just need to find a propper value resistor.
How old are the 7800GT's? How do we know how stable the Vmod is until its been a while?

A 6800GT could handle mass amounts of voltage also. For about a year at the most, then one day... paperweight. At the time everyone said it was fine, until the VR's failed from the intense heat and stress.

If you take care of your cards, with proper cooling, etc. You might not have issues, but most don't take this into consideration. And how do we really know?

Motherboards are designed to be tweaked, and support a wide array of voltages. The 7800GT is designed to handle specific voltages. And VR's designed for the card set specifically for the voltage, to reduce costs on the card, yea sure Vmod's are great for the short term use of the card, but for long term use? I don't recommend it.
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Old 12-15-05, 11:53 PM   #7
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Default Re: BIOS MOD: Flash your 7800GT to 1.5v

Quote:
Originally Posted by jAkUp
Remember the 6800GT? People were getting failing cards left and right because of voltage mods.

The Vreg's on the 7800GT or 6800GT just aren't designed to take that much voltage, and sometimes they shortly fail.


I back JakUp on this one. I watched this happen.
The 7800GT's are way to new to know at this point. Time will tell with those brave souls who do try. Just do not come whining when your shiny new 7800GT bits the dust because u over volted it.
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Old 12-16-05, 12:05 AM   #8
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Default Re: BIOS MOD: Flash your 7800GT to 1.5v

I agree with your points.... I had mine for 2 months running modded no problem. Some of those guys have had theirs modded for much longer. I know 2 months is nothing close to a year, but I will sell my 7800gt for something better in about 6 months anyway so I don't really care for longevity.
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Old 12-16-05, 12:15 AM   #9
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Default Re: BIOS MOD: Flash your 7800GT to 1.5v

Quote:
Originally Posted by adpr 02
I agree with your points.... I had mine for 2 months running modded no problem. Some of those guys have had theirs modded for much longer. I know 2 months is nothing close to a year, but I will sell my 7800gt for something better in about 6 months anyway so I don't really care for longevity.
After 8 to 12 we will know a lot more on it for sure. I hope the 7800GT's hold up.
A pair of them will be my next big upgrade next year.
They will make for great bang for the buck in SLI.
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Old 12-16-05, 12:55 AM   #10
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Default Re: BIOS MOD: Flash your 7800GT to 1.5v

^

You are quite right. Someone just found out that you can voltmodd it by hardware without sottering at all. that is uber good. I am not planning on having my 7800 for 8 more months. I saw what SM4 can do. I saw what DDR4 will do. (7800 is using basically the same ram as the 6800). etc, etc. I will upgrade to the next Nvidia videocard (for the stuff that comes with it, not the extra performance), and then just cool down for a few years....
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Old 12-16-05, 05:50 AM   #11
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Default Re: BIOS MOD: Flash your 7800GT to 1.5v

1v doesnt make that much difference, especially if its just for 3d, i dont htink itll lessen the life of the card by a noticeable amount
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Old 12-16-05, 06:20 AM   #12
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Default Re: BIOS MOD: Flash your 7800GT to 1.5v

Its not even 1volt. Its 0.1 volt we are talking about. Even that was enough to affect a large percentage of those who tried it with the 6800 series. I don't really like the idea of volt modding any video card. Having said that I'll be watching this and other 7 series mods, I'll have this card for awhile and games are only going to become more resource hungry.
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