SLI in 3ds Max Question

Hi to all. Just got my Rig although it is just a second hand. Here are the specs:

Processor : Intel Core 2 Quad Q6600 2.4 GHz 8 MB L2 1066MHz FSB
Memory : 2 sticks: 2GB Kingston 800 ddr
Hard Drive : Samsung 320GB
Video Card : Two sets Video Card SLI
-Inno3D GTS250 512ddr3 256b ddvi
-Inno3D GTS250 512ddr3 256b ddvi
Motherboard : MSI P6N SLI-FI nForce 650i 2pcie/S/L
Monitor : Samsung 22" SyncMaster 2232GW
Power Supply : Cooler Master real power 550w
Fan Coolers : V8 CoolerMaster for CPU
2 pcs CoolerMaster 120mm Auxilary fan
1 pc OCZ XTC Ram Cooler


Now my question:
Correct me if I am wrong but according to my research, 3DS MAX 2009 does not support SLI or Crossfire system. If this is the case would it be better if I make my other Vcard do the Physx? Or will I still stay in SLI mode? Which is better?

Thanks in advance.

Still don't have any idea on this one guys???

OT: I'm installing Win 7 64bit and it is taking forever... is this normal?