Need help Crossfire 7870 XFX and Sapphire

[Atlapro]

So today i bought an XFX Desperation 7870 ghz edition 2GB DDR5

and already had a Sapphire 7870 ghz edition 2GB DDR5 in my build now i put them in crossfire but how am i sure that they are working 100%

since they are both showing up everywhere but i reinstalled the CCC drivers but there the crossfire tab is not showing up

 

[wanderer11]

Crossfire only works in fullscreen. To test this you could run afterburner and kombustor. After running kombustor (in fullscreen of course) look at afterburner to see what the usage was on gpu 1 and 2. This will be much easier with two monitors since you could see both at the same time.

 

[Atlapro]

Only GPU 2 Goes to the maximum clocks the second one doesn't do anything

 

[wanderer11]

When you tab out the clocks will go back down on gpu 2. You have to look at the usage graphs, ignore the clocks. You'll need to use gpuz to record gpu clocks.

 

[Atlapro]

Only GPU 1s usage goes to 99-100% The GPU 2 Stays on 2 and moves only sometimes