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SLI vs. XFire... the showdown.... - Page 4

post #31 of 35
Quote:
Originally Posted by spazstic View Post
You really believe CF needs X38? I am very tempted by those new 48XX series, the scores look pretty decent. I'm guessing there isn't much improvement without an X38/48 board though.
X38/X48s have dual PCI-E2.0 x16 slots, that means 16 lanes(per slot) of 5GB/s. 160GB/s total for your graphics bandwidth.
Quote:
Originally Posted by Mootsfox View Post
Yes. I think you should have a P45 motherboard or higher (assuming you have something older than a P35) for a single card these days. The HD4850/70/x2 all max out the PCI-e 16x bandwidth, and will hurt in crossfire on a 8x or 4x PCI-e 2.0 slot.
P45 has PCI-E2.0 x8/x8, that means 8 lanes(per slot) of 5GB/s. Or 80GB/S. Some review site compared whether full x16 slots are needed compared to x8 slots, what was reveled was that the 4850 lost approximately 15% performance in CrossFire when running on a P45 as compared to an X38/X48.
post #32 of 35
Quote:
Originally Posted by RussianGrimmReaper View Post
X38/X48s have dual PCI-E2.0 x16 slots, that means 16 lanes(per slot) of 5GB/s. 160GB/s total for your graphics bandwidth.
P45 has PCI-E2.0 x8/x8, that means 8 lanes(per slot) of 5GB/s. Or 80GB/S. Some review site compared whether full x16 slots are needed compared to x8 slots, what was reveled was that the 4850 lost approximately 15% performance in CrossFire when running on a P45 as compared to an X38/X48.
It's 5GHz, not 160GB/s for PCI-e 2.0.
Edited by Mootsfox - 7/6/08 at 4:42am
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post #33 of 35
Quote:
Originally Posted by Mootsfox View Post
It's 5GB/s, not 160GB/s for PCI-e 2.0.
5GB/s per lane isn't it?

Either way you only get half with a P45!
post #34 of 35
Quote:
Originally Posted by Kamikaze127 View Post
CrossFire > SLi

And please don't call it 'Xfire" that gets confused with xfire IM.
You "CF" or just full "CrossFire".
How could anyone possibly get confused when we are talking about graphics cards? Give the guy a break
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post #35 of 35
Quote:
Originally Posted by RussianGrimmReaper View Post
5GB/s per lane isn't it?

Either way you only get half with a P45!
5GHz total. I mis spoke as well. PCI-e 2.0 really just doubles the speed, which doubles the bandwidth. The actual bandwidth is 8GB/s, or 500MB/s per lane.
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