16x/4x Crossfire ASRock770DE

lazypnk

lazypnk

lazypnk

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Joined
19 Feb 2011
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Location
Liverpool,UK
Hi,I have a ATI R5850 installed atm In the 16x slot, If I was to buy another for crossfire which overclockers says it supports will I have any problems with micro stuttering or any other problems coming from the x4 port and not just crossfire woe's ?

Thanks.
 
When you crossfire two different PCI-e speeds, both slots downclock to the lowest. So both will run at x4. I know that you can lose a couple of FPS from running in x4 compared to x8 and x16.

There is a couple of benchmarks around
 
Good to see It will run In some shape or form I'll scout around the internet now for the x4 benchmarks now.
 
ewarwoowar said:
When you crossfire two different PCI-e speeds, both slots downclock to the lowest.
Click to expand...
That's not correct. Both PCI-e slots operate with all available bandwidth when running in Crossfire mode. (you can check this by running a DX9 game in windowed mode - these can't use the second card even with crossfire enabled - with xfire on and off. frame rates should be exactly the same).

As for performance, mostly it's not a big deal. Running 16x/4x is only a little slower than 8x/8x or 16x/16x, provided the 4x slot is PCI-e 2.0 (which it is on the 770DE). I run a pair of HD6870s on a P8P67 motherboard that's configured as 16x/4x and performance is generally within 5% or so of a 16x/x16 setup.
 
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