8800GT bios for better overclocking! *test*

[jason4207]

I think the GTS is worth the extra cost. You can't increase the vGPU in the BIOS, but it comes higher out-of-the-box. It also has an extra phase for the voltage, and of course the extra SP's and better cooling. So far the RAM on the GTS is clocking much better for me as well, and it also has tighter timings than the GT model I had stock.

W/o doing any hardmods I had these results:

8800GT-512 741/1728/951 (1.1v BIOS mod & 1.4ns timings) 14,879-3DMark06
8800GTS-512 771/1944/1062 (stock) 16,190-3DMark06

My GT also had RAM issues, and I ended up having to RMA it. I had to reduce RAM clocks to 885 to pass 8 loops of Battle of Proxycon (3DMark03).

[blackiice2007]

I have problems in battle of proxycon also on my gigabyte 8800GT . Since i am using the stock heatsink and fan i didnt go over 700 1750 2000, but i edited my original bios so i can have 1.1 now.

At battle of proxycon i get lots of red lines for a few second then it freeze. I saw that its working with the memory at 950 but i didnt tryed 8 loops. i will now.

[blackiice2007]

I edited My gigabyte Bios again and i think i got it working at 1.15V , i test it and now my card is artefacts free at 720/1800/2000 as long as it dosent go over 85 degrees,so i have to keep the cooler at over 50%
With my 1.1V i got artefacts at 720/1800 very fast, no matter at what temperature.

I also made a 1.2V bios, but i havent test it yet, becose i am using the standard cooling so i recomand it for thous who have changed the cooling.

715.zip = 1.15V 700/1750/950
720.zip = 1.2V 700/1750/950 .
I set this freq to make sure will work for guys with bad memory also. The timings are default from my original gigabyte bios. Let me know how high your cards will go. I will buy this days an Accelero S1


YM (yahoo mesenger ) : blackiice2007 if u have any question

[smsmasters]

Will it ever be possible to have 1.2V via the BIOS?

[Kain665]

So i concocted a custom bios with 1.1v for my xfx 8800gts 256mb. Its great, its 100%stable in both ATiTool and Ozone3D's Fur Benchmark at 756/1836/1050. But, as soon as I load up something like Crysis or 3DMark 06, it freezes within seconds. Why?

[trez0r]

What does the screen look like when it freezes? Is it like checkerboard?

[laragirl83]

I think the GTS is worth the extra cost. You can't increase the vGPU in the BIOS, but it comes higher out-of-the-box. It also has an extra phase for the voltage, and of course the extra SP's and better cooling. So far the RAM on the GTS is clocking much better for me as well, and it also has tighter timings than the GT model I had stock.

W/o doing any hardmods I had these results:

8800GT-512 741/1728/951 (1.1v BIOS mod & 1.4ns timings) 14,879-3DMark06
8800GTS-512 771/1944/1062 (stock) 16,190-3DMark06

My GT also had RAM issues, and I ended up having to RMA it. I had to reduce RAM clocks to 885 to pass 8 loops of Battle of Proxycon (3DMark03).

I don't!
The GTS has average 8% of advantage against the GT! It doesnt help that it has more SPs on it, the 256bit memory bus interface chokes the GTS as well as the GT!
Now if compare the prices it is clear to see, the GTS just doenst worth the extra money... not even close...
Of course, if u r lucky and can get your hands on a GTS for the price of a GT or lower, get it. Otherwise, dont.

[mrQQ]

Hello,

i have this strange problem - it seems that my overclocking doesn't bring any benefit in real usage scenarios. For example at 600/1500/1800 i'm getting 38 average FPS with High settings at 1280x1024 in Crysis, and at 730/1750/1900 i'm only getting 40fps! What could be the problem here? same in 3DMark06 - it's 5100 vs 5200 (SM2).. why only so small gain?

[Kain665]

What does the screen look like when it freezes? Is it like checkerboard?

Nope, the core just freezes. You know - sound looping and all.

I reflashed the bios, and everything seems fixed. Artifacts are appearing as normal (before there were NONE), and the squeeling has more or less stopped. Final clocks are 729/1782/950 artifact free and 729/1836/1050 for benchmarking.

[mrQQ]

what increase in 3DMark06 do you get with overclocking (SM2/SM3 scores alone)?

[eva2000]

Well guys been playing with modifying my 512MB Inno3D 8800GT OC bios clock speeds as I been having problems overclocking both cards when in SLI mode. Only one card in SLI gets overclocked resulting in SLI scores similar to single 8800GT scores. Flashing my bios from 650/1500/950 default to 742/1836/1000 fixed the issue as you can see at http://i4memory.com/showthread.php?p=82839#post82839

Then decided to play with that Exact Mode Extra VID everyone has been discussing. I tried 1.1v and no change in max clock speed in SLI mode, both cards in SLI still max out at 742/1836/1000. Then I tried 1.22v and guess what I can at least do 3dmark06 sometimes at 756/1836/1000 now!

Still have issues oc'ing both 8800GT in SLI mode. Ntune 6 with 169.09 beta drivers overclocks only 2nd card. While Rivatuner 2.06 only overclocks 1st card. But still can pass 3dmark06 @756/1836/1000 now

I'll share my bioses, all modded from the base 512MB Inno3D 8800GT OC edition bios which defaults to 650/1500/950.

Bios files can be downloaded here. Use 7zip or winrar to extract them.

Included is instructions for flashing:

All custom bioses are based on the original 512MB Inno3D 8800GT OC 62.92.16.00.05 bios.

- Original 8800GT OC 650/1500/950 bios
- 650/1500/950 1.1v Exact Mode Extra bios
- 650/1500/950 1.22v Exact Mode Extra bios
- 700/1700/1000 1.1v Exact Mode Extra bios
- 742/1836/1000 non voltage change bios
- 742/1782/1000 1.1v Exact Mode Extra bios
- 742/1836/1000 1.1v Exact Mode Extra bios
- 742/1836/1000 1.22v Exact Mode Extra bios

#####################
Flashing Instructions
#####################

1. Take a *.rom bios you want to use from bioses folder and rename it to update.rom

2. Create bootable floppy disk and place contents of nvflash folder on floppy disk

3. Place update.rom on bootable floppy disk

4. Reboot system with bootable floppy disk inserted

5. At DOS prompt type the word listed below in quotes (type without quotes though). Always backup your original video card bios before flashing!!!!

"backup"

this will backup your video cards default bios

"update"

this will flash your video card to the modded bios named update.rom

"restore"

this will flash your video card with your original video card bios you backed up.

Disclaimer: I am not responsible for any damage done to your video cards. Do so at your own risk!

FYI, i used the 742/1836/1000 non voltage change bios

Enjoy




Before and After

Before stock bios but bios modded to 742/1836/1000

3dmark06 = 18,842 http://service.futuremark.com/compare?3dm06=4397853

click image for full screenshot



After bios modded to Exact Mode Extra VID = 1.22v with 742/1836/1000 clocks. Then overclocked to 756/1836/1000 using Rivatuner 2.06 for 2nd card and Ntune 6.x beta for 1st card.

3dmark06 = 18,944 http://service.futuremark.com/compare?3dm06=4435069

click image for full screenshot



Seems only SM3/HDR score benefited from the GPU clock bump from 742mhz to 756mhz

[smsmasters]

Very interesting Eva, I have the Inno3D 8800GT non oc edition and I can't get 1836 shaders stable with the 1.1V BIOS Mod. The max stable I can get is 742/1782/972 (If I set the RAM to 1000 sometimes games will hard lock).

Are you able to check the vgpu voltage exactly using a multimeter when using the 1.22V BIOS Mod?

[mrQQ]

can someone please post 3DMark06 scores BEFORE and AFTER overclocking, for me i get very very small gain.. (and not combined scores, but SM2/SM3 ones)

[eva2000]

Very interesting Eva, I have the Inno3D 8800GT non oc edition and I can't get 1836 shaders stable with the 1.1V BIOS Mod. The max stable I can get is 742/1782/972 (If I set the RAM to 1000 sometimes games will hard lock).

Are you able to check the vgpu voltage exactly using a multimeter when using the 1.22V BIOS Mod?

can't check voltages in SLI mode on striker as NB/SB heatsinks in the way.. will check later.. seems only 3dmark06 can do 756/1836/2000... 3dmark05 can do 742/1890/2000 with shader bump now.. maybe limited by stock single slot heatsink ??

[alexio]

You only changed the label of voltage table entry 4 (that's the "extra" option in Nibitor) so no magic here eva

[eva2000]

You only changed the label of voltage table entry 4 (that's the "extra" option in Nibitor) so no magic here eva

for 1.22v ? really bummer.. seems i can sometimes pass 756mhz gpu or 1890mhz shader now before i couldn't ..

[alexio]

for 1.22v ? really bummer.. seems i can sometimes pass 756mhz gpu or 1890mhz shader now before i couldn't ..

Maybe the card ran hotter in previous tests due to hotter case or ambient temperature I don't use a computer case by the way

Can you measure the temperature with both bioses at the same clock and fan setting in idle and load? There should be a big leap in core temperature with the dinky heatsink

[nuttah]

Its a real pity we cant overvolt more via the bios, there is so much room for the 8800gt... Does anyone have a link for a voltmod? Thanks

[eva2000]

don't use case either.. temps around same 57-61C load @742-756mhz gpu

[smsmasters]

Hmmm...I get lockups in games if I set my RAM above 950MHz on my Inno3D, would loosening the RAM timings help? I'm not sure how exactly to do so in nbitor.

Thanks!

[chad]

i get lockups too, i have the bfg 8800gt's in sli, when i bench them seperate, one card i can run 756/1044/1912 the other card i bench 756/1000/1900. when i put them together i can bench 756/1000/1900, but in games i cant pass 675/960 without lockups, what gives. i still can return them till jan21. But the volt mod bios worked for me

[Cold Fussion]

I did the 1.1v mod and i can't oc the core any higher than i could without it (max 700) but the shaders could go 40mhz higher.

[A_Tiny_Chipmunk]

i can oc to 771/1939/1015

should i bother with the bios mod?

this is with a XFX 8800GT Alpha dog edtion (600mhz) witha accerlo S1 with 2x 80mm fans on it.

thanks.

[krogen]

i can oc to 771/1939/1015

should i bother with the bios mod?

this is with a XFX 8800GT Alpha dog edtion (600mhz) witha accerlo S1 with 2x 80mm fans on it.

thanks.

On stock volts? That's crazy. How much does it artifact? :P

I'd say go for it. If you reach 800/1950/1015 that would be sweet.

[A_Tiny_Chipmunk]

is it really worth it?