I am currently wandering that if I have a GTX 660 and a GTS 450(in my current old rig) can i run them SLI? I read that as long as they had the same drivers you could in XP, but not Vista. Are they both Geforce drivers and would it happen in windows 8 64 bit?
To further this with more detail the GTX will be in my new rig and the GTS is in my current
No, you cannot run a 660 + 450 in SLI. They need to be the same GPU.