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Crossfire x4 vs x8 vs x16?

post #1 of 6
Thread Starter 
I'm planning a new build and I'm noticing board that have 2x PCI-E x16 slots run in x8 or x4 mode. What does this mean and what kinda effects does it have on video performance? I plan to use 2x 5770 in Xfire cause its what I have.
post #2 of 6
8x will only effect Very high end cards (480, 5970 etc), and even then it is only like 4ish %

4x will effect almost any card

8x will be fine for 5770s
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post #3 of 6
Quote:
Originally Posted by reflex99 View Post
8x will only effect Very high end cards (480, 5970 etc), and even then it is only like 4ish %

4x will effect almost any card

8x will be fine for 5770s
I have two 5870's in CF running at x8 and the performance drop compared to x16 is negligible.
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post #4 of 6
Quote:
Originally Posted by reflex99 View Post
8x will only effect Very high end cards (480, 5970 etc), and even then it is only like 4ish %

4x will effect almost any card

8x will be fine for 5770s
its been shown that even at 4x even a 480 only loses ~5% performance

(albeit on an X58 but w/e)
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post #6 of 6
Thread Starter 
Quote:
Originally Posted by jeffries7 View Post
Good find, Thanks. That helped with my concerns about running x16/x8 mode.
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