1. Install both sets of GPU's. Ati first then Nvidia
2. Attach GPU's to monitors (2 preferably as you can see what you are doing)
3. Click windows\control panel\all control panel items\display\screen resolution
4. Click detect displays
5. Click and switch to Ati display extended to Nvidia if not already
6. Open CCC panel
7. Disable CrossfireX if enabled
8. Switch to Nvidia only display
9. Unplug the Ati cord and enable PhysX from the nvidia control panel, leave open
10. Plug back in the Ati cord
11. Detect displays in the windows display control panel
12. Extend the display over to Ati
13. Click on the Ati display picture and check the "Make this my main display".
14. Click on disable and enable of PhysX and hit apply. Important, if apply doesn't appear at this stage, you won't have PhysX!
15. Leave on extended display
16. Run vantage 3D mark CPU test 2 to confirm Physx enabled
17. Enable CrossFireX, confirm again with CPU test 2
http://service.futuremark.com/compare?3dmv=772700
Worked every time on my set up. You may need more power to run hence me using 2 PSU's.
System;
Gigabyte X58 Extreme Mother Board
i7 940 CPU
Gskill 6 gig tri ram
Ati 4870X2 x 2 + Nvidia 280GTX
Coolmaster 1250w + Thermaltake 1200w PSU's with inter connector
WD 500gig HD - Windows7 version 6.1.7000
3 x VecoRaptors 300 gig RAID 5 - Vista Ultimate 64
WD 300 gig storage
1 x DVD burner
24" + 27" monitors
Custom made water cooling with 2 separate system loops
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