Very poor GPU performance with iMac Mid 2011 (i7) and Radeon 6970

[Czo]

Anyone has problems with Yosemite GM 2.0? My GPU is very slow in Yosemite when compared to Mavericks.

http://homokozo.czo.hu/yosemite.png
http://homokozo.czo.hu/mavericks.png

 

[vista980622]

Anyone has problems with Yosemite GM 2.0? My GPU is very slow in Yosemite when compared to Mavericks.

http://homokozo.czo.hu/yosemite.png
http://homokozo.czo.hu/mavericks.png

Looks like Cinebench is testing the integrated graphics card instead of the discreate one.

 

[ayeying]

That's not the integrated video card... since there is no integrated on that iMac.

 

[iHateMacs]

On my iMac I got 93fps on Mavericks then 88fps on Yosemite.

After the last couple of updates Yosemite is showing 92.25fps now.

So no major difference for me

 

[Der Kommandant]

I think that Apple doesn't optimize their drivers for the iMac 2011 models as they used to. Since Mavericks the GPU performance has gone downhill. A few months ago I installed Snow Leopard and it was (and still is) much faster than Mavericks and Yosemite.