GTX280 flashed to GTX285 help?

[TJ TRICHEESE]

i have flashed my gtx 280 to a gtx 285 and it works!! but have to downclock it so i was wandering whether anyone knows any gtx 280 vgpu and vmem mods

[Leeghoofd]

Look here mate : GTX280 Vmod (http://www.xtremesystems.org/forums/showthread.php?t=191850&highlight=GTX+280+Vmod)

[TJ TRICHEESE]

thanx for the help

[Onoff312]

Just wondering why would you flash the bios i doubt it would help ocing at all.

[TJ TRICHEESE]

Onoff312:
The main reason for flashing the bios was to see whether it could be done, but the advantage of a gtx 285 bios is that the core can go slightly higher without the shader going higher and the shader is the real bottleneck

[DavyBoy]

So would it be possible to run your 280 with a 285 in SLi now that you've flashed it with a 285 BIOS??

[Dude_Person]

I'm really suprised that didn't brick the card.

[Hondacity]

wow surprising ....benched?

[Boulard83]

I want to see a becnh / GPUz shot.

[ajaidev]

very odd we flashed a GTX 260 "192" with a BIOS from GTX 260 "216" and it did brick the card to our surprise...

[TJ TRICHEESE]

should i show both 280 and 285 gpuz shots (note 285 needs to be UNDERCLOCKED as it runs on lower voltage)

also in nibitor and rivatuner soft voltage mods do NOT work

Spose ill have to flash it back to a 285

bioses used:

original zotac gtx 280 amp! bios but with extra voltage and clocks

original zotac gtx 285 bios but underclocked for stability

Ill try sli with palit 2gb gtx 285's when i get them

[TJ TRICHEESE]

wow surprising ....benched?

i have not benched 285 because i have not done the neccesary volt mods to get it to a speed that could compete with the 280

and i lost 3dmark vantage + 06 when i installed raid

be back in a bit with screenies

[TJ TRICHEESE]

sorry about multiposting but here are screenies:

my modded gtx 280 bios (left)
zotac gtx 285 bios (right)

same drivers for both bioses

[Jamesrt2004]

biosversion is diff, i thought they would both be same ;)? or am i being stupid :S?

[TJ TRICHEESE]

biosversion is diff, i thought they would both be same ;)? or am i being stupid :S?

no ur not being stupid, i tried to use the gtx280 bios and change the subsystem id, device id and board id so it thinks it a gtx 285, then it would have been the same bios version but it didnt work as a gtx 280 so i had to use an actual gtx 285 bios

[TJ TRICHEESE]

Ill post some pics of the flashing (i dont know how to take screenies in 98 dos) when i fine the usb cable for my phone

[ShannonR]

biosversion is diff, i thought they would both be same ;)? or am i being stupid :S?

The bios version will be different as it is a completely different card bios

[KILLER_K]

I like how it even list the die shrink also on gpu-z. Classic indeed, good luck with it.

[W1zzard]

I like how it even list the die shrink also on gpu-z. Classic indeed, good luck with it.

no way to detect die size via software, so if gtx 285 -> 55 nm, gtx 280 -> 65 nm

[KILLER_K]

no way to detect die size via software, so if gtx 285 -> 55 nm, gtx 280 -> 65 nm

So where do you think the info is coming from then when it is read?

He flashed the bios, software loaded and then gpu-z reads it.......

[W1zzard]

"no way to detect die size via software" .. but let's ask the author of gpu-z .. oh wait, that's me :)

[KILLER_K]

That is why i was saying it is classic that it showed a different die size on the gpu-z report, wow.

I know you made it and i'm glad you made it. It is a nice app indeed. I'm just curious of why it then showed a die shrinkage after he flashed the bios, since that even you are saying it can't read the die size in gpu-z. Someone could do a bit of damage like that buying say a 280 and flashing it and it then show as a 285 in gpu-z.