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x16/x16 crossfire vs x8/x8

post #1 of 15
Thread Starter 
I am considering purchasing an LGA1155 board but dual GPUs they only run at x8/x8.

From my research it seems that you lose about 1-3% tops when running at 2500*1600 but a lot more when running games over multiple monitors / bigger resolutions.

My setup will be to only ever play games on my 30" (2500*1600) but I will have up to 4 additional monitors on at the same time (of varying resolutions), just not rendering the game. Will this cause more performance loss in line with people running games at 5000 * 1600 etc. Also, all the tests I could find were on last generation GPUs and the most current will use even more bandwidth?

Realistically, with multiple monitors (so a res upward of 6000 * 1600) but a game running at 2500*1600 using two 6950s or 6970s what performance hit should I expect to take with x8/x8 vs x16/x16?
post #2 of 15
what graphics cards do you plan to use?
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post #3 of 15
Makes no difference, there are numerous test benches that have been done that confirm that 8x8x on the P67 chipset equals 16x16x performance on anything else.

I have a P67 board that will do 16x16x and tested a pair of 580's against my prior board (an Asus P8P67 Deluxe runs at 8x8x in SLI) and the results were virtually identical.

So, in answer to your question, no performance hit at all.
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post #4 of 15
The 8x starts slowing it down a 1-3FPS at 2560x1600. I recommend just getting a 5770 or something for the other monitors.
    
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post #5 of 15
There was an article about this recently online. I think it was on either Tom's Hardware or Anandtech, but basically they concluded that the only real performance drop you would see is if you had exactly that: a multi monitor setup with a big resolution. There the bandwidth starts to come into play. Unfortunately I can't remember exactly what the percentage drop was, but it was significant enough to give pause. If you are looking for an eyefinity setup, I would wait until the next socket intel is releasing this year. It'll give you the x16/x16 slots which will give you access to all the horsepower your cards can pump out, but will probably cost considerably more than the 1155 socket.
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post #6 of 15
If you are that concerned, you could pick up the board I am currently using the Asus WS Revolution. It has an NF200 chip which provides extra lanes of bandwidth allowing 16x16x if needed.

The board comes it at around $260 which is the cheapest NF200 based board I've seen.
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post #7 of 15
i was about to make a thread but eh might as well ask here, i have 2 6950's in 16x, but i wanted to move my sound card to the bottom and move the other 6950 to the top (sandwich) in the 8x, so basically i'd have one 6950 on 16x and the other on a 8x, conclusion will i see a drop in fps or anything big if i do???
    
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post #8 of 15
you might see a 1% change or so, but nothing major.
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post #9 of 15
Quote:
Originally Posted by Firebeard;13650365 
i was about to make a thread but eh might as well ask here, i have 2 6950's in 16x, but i wanted to move my sound card to the bottom and move the other 6950 to the top (sandwich) in the 8x, so basically i'd have one 6950 on 16x and the other on a 8x, conclusion will i see a drop in fps or anything big if i do???

Can your eyes notice a 1-2fps difference?
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post #10 of 15
Quote:
Originally Posted by Kenshiro;13650401 
Can your eyes notice a 1-2fps difference?

nope, i figured that the the 8x would be running at half performance? :S
    
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