Why i get smaller fps with dual graphics?

[Guest]

why do i get more lag with using crossfire than when using single Gpu (7640g) is there anyway to fix this to add more performance?

i have hp pavilion g6-2104so notebook with specs like:
AMD A8-4500m quad 1,9ghz
AMD Radeon HD 7670m and 7640g
4gb ram
windows 7 ultimate

 

[devark]

u might be doing it wrong or voltage probleams

 

[Guest]

i don't think that's the problem but it could be voltage problems but my system isn't overclocked
but it's still possible =/

 

[gibsonguy]

you probably don't have the proper profile installed with catalyst for those cards, and secondly i do believe the 7670M and a7640G are 2 different GPU's i don't think they are compatible.

 

[bystander]

At the speed of that CPU, you are likely CPU bound, so adding another video card did nothing to help FPS, as the GPU wasn't the problem. To make matters worse, Crossfire and SLI require some added overhead to be run on the CPU, slowing things down more.