Ok folks.. over the past couple of months, I've upgraded my system quite a bit.. and it's left me with a few extra spare parts. An 8600GT and a 610. Question is.. should I bother using one of those as a dedicated physx card? I am using a 650Ti backed up by the FX4100.. so not sure if I have enough computing power as it is to play modern games like the new Tomb Raider..etc. Thoughts?