Hi people, thanks a lot for the info here.
Here's my experiences on the subject. I have an XFX HD6870 2GB version, GA-Z68MA-D2H-B3 mobo, i7 2600k (non-oc), 8GB RAM (clocked at 1600mhz).
I used to have around 48fps/7pts in Cinebench on OSX 10.7.2, Chimera/###### (don't remember the version), SMBIOS macpro3,1, graphicsenabler=yes. When I checked again the other day I got less than half, 21fps/3pts, no matter what. Not sure at what point I did something that killed the performance but I wanted to fix it. Needed to update to 10.7.4 anyway. With this config AGPM is not running.
First I updated to Chimera1.11 / Multibeast4.6.1. Same results. Then I changed SMBIOS to macpro5,1 (had to delete appletymcedriver.kext in the process to prevent KP). Results back at 47fps/7pts. AGPM running (without editing anything). Happy.
Then I updated OSX to 10.7.4 and the results are back to 21fps/3pts. AGPM still loading though. Not Happy.
Any ideas on this?
NB: Unigine seems to run the same on all these installs...
Edit : installed HWmonitor and my CPU seems stuck at 1600Mhz (x16) so looks like I have some work to do...