I think its like this.
When you use 1 gpu @ 100usage, your CPU usage stays low because its "bottlenecked"
ingame because of your GPU.
Now when you have 2 GPU's:
- First you need more CPU Power to power the 2 GPU's
- Second because you run higher frames ingame, some ingame effects need more cpu power to be pushed up to that framerate.
= Resulting in overal higher CPU Usage, but also Higher Frame rates then with 1 card.
I think your CPU Usage will be as high as long as you have GPU Power to push high frames ingame.
So the faster your GPU's are, and you have enough CPU Power, your CPU usage will be as high as your GPU's push framerates ingame
Sry for the use of bottleneck wrong but needed it to make the point
And sry if its totally wrong, purely ''thoughts'' by me.Edited by prescotter - 11/3/11 at 5:22am