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crossfire in a x4 PCIE slot? - Page 2

post #11 of 23
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Hey so I tried it in the x4 slot and played some Planetside 2 maxed out. I CANNOT tell the difference between the two. I ran furmark and checked the average FPS after 5 minutes and the x4 slot ran 2 FPS slower than the x16 slot. (100 as opposed to 98) I think Im gonna keep it in the x4 slot for a while since it's running so well. Maybe x4 slot is perfectly viable for xfire.
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post #12 of 23
It is perfect for crossfire. That is why amd allows an x4 slot for crossfire.

Nvidia not so much.
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post #13 of 23
Thread Starter 
Oh and i double checked GPUZ, its IS showing the card as running x4 2.0.
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post #14 of 23
I would imagine your framerate consistency would be horrible.
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post #15 of 23
Thread Starter 
Quote:
Originally Posted by BinaryDemon View Post

I would imagine your framerate consistency would be horrible.
With what? One card or crossfire? With one card its virtually identical to when it's in the x16 slot so I cant imagine it would be bad with xfire.
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post #16 of 23
Quote:
Originally Posted by Deadboy90 View Post

Quote:
Originally Posted by BinaryDemon View Post

I would imagine your framerate consistency would be horrible.
With what? One card or crossfire? With one card its virtually identical to when it's in the x16 slot so I cant imagine it would be bad with xfire.


Hmm... you should probably think about what you just said more critically next time. The slots are not the same. You are forcing the driver to slow the cards down so it can do its best to synch cards moving at vastly different speeds. Also, the impact is less on AMD systems cuz all the pcie data does not go thru the cpu like with intel, so it's slower anyways. Now its just more slow.
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post #17 of 23
I would say contact the manufacturer of the board and they could give you a surefire answer.
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post #18 of 23
Thread Starter 
Quote:
Originally Posted by tsm106 View Post

Hmm... you should probably think about what you just said more critically next time. The slots are not the same. You are forcing the driver to slow the cards down so it can do its best to synch cards moving at vastly different speeds. Also, the impact is less on AMD systems cuz all the pcie data does not go thru the cpu like with intel, so it's slower anyways. Now its just more slow.

Ill refer you to the link I posted in my OP. According to the benchmarks they posted, the difference between an x4 slot and a x16 slot was about -10%. And from what im seeing with my card here Im thinking it may be even less than that. I sent an Email to Asus asking about this so I hope i will have a definative answer in a couple days.
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post #19 of 23
16x 4x crossfire runs just fine. Especially with the cards in the OP's signature. I have personally had a 6950 cf setup in a Asus P6T which did 16x 4x and it worked just fine. For me, I had no visible loss in games, and I lost like 200 points in 3dmark11 at the max.

HardOCP did a test of this, and the difference is next to nothing:

16x 8x crossfire
4x 4x crossfire

It might not be the case with the newest gen. cards, but if he is rocking 6850s, it's really nothing to be worried about.
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post #20 of 23
Quote:
Originally Posted by Deadboy90 View Post

With what? One card or crossfire? With one card its virtually identical to when it's in the x16 slot so I cant imagine it would be bad with xfire.

With Crossfire. You will have a situation where the 1st card gets better framerates than the 2nd. It might feel choppy even if your getting good framerates.
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