Crossfire 16x and 4x 5850.

[dark0anima]

How much of a performance hit would i get if i cross fire 2 5850 using a 16x and 4x?

 

[blanketyblank]

How much of a performance hit would i get if i cross fire 2 5850 using a 16x and 4x?

http://www.techpowerup.com/reviews/AMD/HD_5870_PCI-Express_Scaling/25.html

According to this a 4x slot can deliver about 95% of the bandwidth for a 5870 so
I think you'll be taking even less of a hit since the 5850 is a slower card and would need less bandwidth.

 

[Udgnim]

probably not much

http://www.techpowerup.com/reviews/AMD/HD_5870_PCI-Express_Scaling/25.html

edit: ah I got beat

 

[xboxist]

Is there a similar comparison for 5770 Crossfire using a 16x and 4x slot?

edit: yes, I foolishly ordered a board that has those slots and I'm hoping I didn't shoot myself in the foot TOO much...

 

[happy medium]

I think it depends on which game you are running.
4x is not so good for some games and others its fine.
I would not buy another 5850 to run in a 4x slot.

If your gonna spend 600$ for crossfire ,just get a 5970 and use the 16x slot.

I never seen a review with a 5770 in a 4x slot.

 

[toyota]

yeah I certainly wouldnt buy another $300 video card knowing full well its going to be gimped from the get go.

 

[dark0anima]

ok thanks guys, i'll just skip buying another 5850.

Mods please close, question solved.

 

[Bill Brasky]

I believe your P55 mobo is pci-e 2.0. As I understand it, x4 lanes at 2.0 spec is equivalent to x8 at 1.0 pci-e spec. I think the performance hit would be tiny and shouldn't deter you from doing crossfire, assuming you're using a high enough resolution to justify xfire in the first place.

 

[ScorcherDarkly]

You could always look at returning the board for something different.