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i want to make sli with 2 different cards xfx -asus 7800gtx

Last response: in Graphics & Displays
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December 5, 2006 9:18:57 AM

its posible?how?and what driver its god for this,a i have asus a8n sli premium.
December 5, 2006 3:03:45 PM

Mpilchfamily is correct, although I would use the latest driver from www.nvidia.com as the ones on the CD may be old. Make sure you are not trying to SLI a 7800GTX 256mb and 7800GTX 512mb as these two cards can not be put in SLI together.

XFX Support
December 5, 2006 5:46:09 PM

Quote:
Mpilchfamily is correct, although I would use the latest driver from www.nvidia.com as the ones on the CD may be old. Make sure you are not trying to SLI a 7800GTX 256mb and 7800GTX 512mb as these two cards can not be put in SLI together.

XFX Support


Of course they can, they just require more effort :p  (BIOS mod the 512 to report itself as a 7800GTX 256MB and it will work fine, albeit at the speeds of the slower card when in SLI and with half its RAM disabled)
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a c 271 U Graphics card
a b Ĉ ASUS
December 5, 2006 6:19:34 PM

I thought half the RAM would be disabled automatically or does this not happen with the 7800GTX?
December 5, 2006 6:33:03 PM

Yes you can, however the it will limit each processor by the speed of the slowest processor. So if one is clocked at 430 and one at 450 they will both run equivelantly at 430.
Ideally you should up the slower card to equal the faster one, so overclock the 430 mhz one to 450 mhz.

Or if your bold, you could overclock both up to around 500 or 575 depending on overclocking reviews you read.
December 5, 2006 6:39:51 PM

To be honest it would be a waste to cripple a 7800GTX 512 by trying to pair it with a 7800GTX 256, although it would be possible its far more effort than its worth for the minimal performance gains over the "un-crippled" 7800GTX 512 running alone.

It is useful to know that this is possible for those people with stock overclocked 7900GTs who may not be able to find a partner for it now. Gainward make (or rather, made) a 7900GT Golden Sample with 550/1400 clocks and 512MiB RAM - exactly the same as the newer 7950GT.

As you cant get the Gainward card now, owners of this have been buying 7950GTs and bios modding them to report at 7900GTs so that they will run with the older card.

Unfortunately you cant just take nVidias word as gospel for these things - they come up with things like "8800GTS and GTX will ONLY work in PCIe x16 this is why nForce 4 Intel Edition cannot run them in SLi", which is blatantly disproven by the fact that my 8800GTX runs in my other computer which uses an ASrock 775DUAL-Vista with PCIe x4 only. Hell it works in my P5W DH in x8 mode with a x8 PCIe RAID card in the other PCIe slot.

nVidia, like all companies, have their own interests too, this is why we cant run SLi on Intel chipsets without hacked drivers :( 
a c 271 U Graphics card
a b Ĉ ASUS
December 5, 2006 6:46:10 PM

Ahh, that I did not know. Thanks for the info. :) 
December 6, 2006 4:22:27 AM

i have 2 7800gtx with 256,but is different brands,xfx and asus.
a c 271 U Graphics card
a b Ĉ ASUS
December 6, 2006 6:37:19 AM

I am running 2 7900GT's an XFX OC together with an Asus that is at standard clock speed and they play very well even after the Coolbits hack has been applied.
December 16, 2006 11:40:47 AM

i solve the problem,i bought a evga 8800gts
a c 271 U Graphics card
a b Ĉ ASUS
December 16, 2006 2:49:23 PM

8) Nice one 8) I hope you have many hours of happy gaming with that Dude.
!