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Crossfire using PCI-E x4

joewm18

joewm18

joewm18

Associate
Joined
14 Dec 2004
Posts
241
Hi all,

I may be selling on my ATI 4850 512mb to a mate who has 1 already and wants to put them in crossfire.

The second PCI-E slot on his mobo will only run at x4 speed, I am assuming if he runs in crossfire the other slot which is x16 will be forced to run at x4 speed.

The big question is, will running at x4 speed make any difference to performance whatsoever? Would it be enough of a difference to not bother going crossfire, or would there be practically no decline in performance of the cards?

He'll be getting mine for 40 quid so it's a good little upgrade!
 
I saw somewhere yesterday that running at x4 rather than x16 still gives you 95% of the performance in worst case scenario.
 
Some people on here have tried it with P35 boards and they said that the x4 slot completely murdered the performance. I really would'nt bother.
 
If it's P35 then it will be x16/x4 and the performance will be awful.
If it's P45 then both slots will run at x8 and the performance will be fine.

Same goes for X38/X48, both of those will run full speed.

I don't know about the other brands of chipset.
 
Chuck it in his rig and bench it. The comparisons above showing 16x/4x crossfire losing out to 16x/16x crossfire don't really help much. What you need to know is how much faster is 16x/4x crossfire compared to a single 4850, no?
 
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