Re: Crossfire question for GA-P55-UD4P
There is zero performance impact unless you run eyefinity resolutions of 3840x2160 or 5760x3240. Even then the difference is a couple of frames at most.
Search HardOCP, they've done 16x/16x, 16x/8x, 8x/8x and 8x/4x comparisons. Even 4 lane Crossfire isn't effected until moving to 1920x1080and beyond.
Also be aware that running two GPU's in your board will result in both slots running at 8x. Also note that with a multi GPU setup, full speed USB3 and SATA6G will both be disabled.
Edit: If you plan on getting another 5850 for crossfire there is zero advantage in setting your original card as the primary, even if its clockspeeds are faster etc. You will get identical results regardless of which card is the primary. The only time this matters is with hybrid crossfire. For example you can crossfire a HD4870 and a HD4850 together. In this case you would want the 4870 as the primary so that you can use it solo in games that don't scale with CF well or in new releases that currently don't have a CF profile.
Last edited by Psycho101; 01-08-2011 at 01:24 AM.
Coolermaster CM 690 II advance Case
Corsair HX750 (CWT, 91%(80+ Gold rated @230V) single 62A 12V rail
P55A-UD4 v2.0 @ F14
Core i5 760 @ 20 x 201, 4.02GHz
TRUE Black with a single Noctua NF-P12 pumping out 55 CFM @ 19db .
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WD Caviar Blue 640GB C (Steam, Games, Storage, Temp Files & Folders, etc)
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