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Crazy Asus P8Z68-V Pro Question

post #1 of 8
Thread Starter 
Can I run two GPU's in crossfire in the two bottom PCIe slots?

The second slot runs at x16 or x8 and the bottom slot runs at x4. According to the Asus website all 3 slots share the same bandwidth.

A strange question but I have my reasons for doing this.
Edited by Jokah - 5/21/11 at 2:54pm
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Tevatron K
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post #2 of 8
Some motherboards require at least one in the top slot. So its a maybe.
    
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post #3 of 8
Thread Starter 
I probably should have mentioned I will be running a GTX 570 in the top slot and two 5870's in the bottom slot. This a genuine question I need to know the answer to and again I do have my reasons for doing this.
Tevatron K
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Tevatron K
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post #4 of 8
As I understand it, if you have one graphics card plugged in you get x16, if you have 2 graphics cards plugged in you get x8, and if you have 3 graphics cards plugged in you get x4.

So each card you add lowers the bandwidth going to each card. I believe all cards will run at the same bandwidth.
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post #5 of 8
The bottom slot is problematic on the P8Z68-V Pro. Since Asus didn't use a PLX bridge on this board it is lacking in bandwidth. Using the bottom slot at x4 results in two x1 slots and two onboard controllers being disabled... one of the controllers being eSATA.
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post #6 of 8
Thread Starter 
Quote:
Originally Posted by Nicodemus_MM View Post
The bottom slot is problematic on the P8Z68-V Pro. Since Asus didn't use a PLX bridge on this board it is lacking in bandwidth. Using the bottom slot at x4 results in two x1 slots and two onboard controllers being disabled... one of the controllers being eSATA.
Does this mean if I used three cards they would be running at x8, x1, x1?
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Tevatron K
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post #7 of 8
Quote:
Originally Posted by Jokah View Post
Does this mean if I used three cards they would be running at x8, x1, x1?
They should run at x8 x8 x4 (correct me if wrong), but you won't have access to any other PCI or PCI-E slots. The x4 would of course bottleneck the middle x8 card like on most other mobos.
Edited by Mapex - 5/26/11 at 12:56pm
post #8 of 8
Thread Starter 
Thank you. If this is how it works then that will suit my needs.
Tevatron K
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Tevatron K
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