Crossfire confusion

salvage-this

salvage-this

Active Member
I am deciding on a new motherboard that will be good for running cards in crossfire in the future. A lot of the motherboards have 2 pci express x16 slots that one runs in x16 and the other in x4. I have read on some of the other posts that the x4 slots are better for physics cards? Can anyone clear this up? I want to make sure that there is not a big problem with running two cards in crossfire later. here is my choice as of now:

http://www.newegg.com/Product/Product.aspx?Item=N82E16813130250#spec
 
Just keep in mind that if your system has an ATI card (or any non-nvidia GPU), nvidia will disable physx on their cards (the jerks :mad:), so you wont be able to use a nvidia card as a physx card.
 
sniperchang said:
Just keep in mind that if your system has an ATI card (or any non-nvidia GPU), nvidia will disable physx on their cards (the jerks :mad:), so you wont be able to use a nvidia card as a physx card.
Click to expand...

If I was going to run cards in crossfire I will match two ati cards. I was thinking about doing this when the 4850 becomes obsolete and I can just get better performance with 2 mid range dx 11 cards rather than 1 top end card. I didn't think that you could run nvidia and ati together :confused: I figured that you either had to have 2 nvidia in sli or 2 ati in crossfire. The more that I think about it, the less appealing it sounds since I don't need to be on the cutting edge of graphics.
 
If your running a 770 board it wont default the two slots to 8X/8X in crossfire. The first main slot will stay ay 16X and the second at 4X. The second slot cheats by getting its 4 lanes off the southbridge. Sorta of a waste for crossfire unless your running two lowernd cards. The only true C/F boards are the 790X/GX and FX.
 
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You can run physx with an ati and nvidia card together. but, you will not be able to use catalyst. jsut use the plain drivers, and some other overclocking tool (like RivaTuner)

Try just using the Ati display driver and the nvidia control panel to enable PhysX.

Theoritcally and logically, it should work.
 
linkin said:
You can run physx with an ati and nvidia card together. but, you will not be able to use catalyst. jsut use the plain drivers, and some other overclocking tool (like RivaTuner)

Try just using the Ati display driver and the nvidia control panel to enable PhysX.

Theoritcally and logically, it should work.
Click to expand...

You can run an ati card and nvidia (not in windows vista though). However, if the nvidia even hints that there's a non-nvidia GPU in the system, physx is disabled if you have driver version 186 and above.

Source1
Source2
Source3

Also sorta mentioned in the nvidia faq


You might be able to try re-enabling physx:
Fix1
GenL's Mod
 
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