2 GPUs with IGPU? Only the primary GPU is used?

cybernick86

Honorable
Nov 12, 2013
15
0
10,510
In a 2 GPUs Scenario with Win 7 in extended mode (2 screens per GPU),
I understand that there can only be one master GPU, & the other is slave (without crossfire).

If I enabled my integrated IGPU, on my mobo (another 2 screens), I understand that it will share my system ram.

However, does that use up any CPU computing resources or does my primary/master GPU do all the rendering/display work?
 

kajin41

Honorable
Jan 27, 2013
56
0
10,660
the igpu wil do the processing for what ever monitors it is attached to how ever the igpu has its own dedicated spot on the die so it wont take any processing power. to get improved display preformance get fast ram like 1600 or overclocked 2100
 

cybernick86

Honorable
Nov 12, 2013
15
0
10,510


Hi Kaijin41, can I clarify that you mean the igpu on an Intel Haswell processor is separate from the 4 CPU cores on an i-5?

My experience is that in extended mode, the primary gpu seems to be doing the processing for windowed applications on the screens plugged into my secondary GPU, unless I run full screen applications on the screens, then the secondary GPU will do the processing.
 

cybernick86

Honorable
Nov 12, 2013
15
0
10,510


I'm got frustrated toying with displayport cables, I want to do without them, that means keeping it to 2 outputs per card.