Well guys, thanks for helping me out, but i have done some research on the subject and i think we need to revive this discussion.
What i found out based on those videos:
(Credit to Linus Tech Tips)
Is that the GTS 450 is basically the optimal physx card at the moment.
Now comparing the 9800GT to the GTS450 i found that they are not so far apart in mathematical performance,
Okay now before you execute me for such words i got math to prove my point.
Physx calculations are basically math right? And can be somewhat measured under Floating point performance...
Based on pure Gflop/s performance the 9800GT Delieveres about 500Gflop/s
, and the GTS450 putting out something around 600
On the other side, In terms of cuda cores... The GTS450 has 192 of them running at 1566MHz, The 9800GT has 112 of them running that a similiar 1500MHz.
Seeing how the guy in the video ran a GTX580 and looking at reviews that say that GTX660 is a bit behind the 580, we can conclude that the physx performance gap between the GTS450 and the 9800GT will be about the same as the graphics performance between the GTX660 and the GTX580, so the 9800GT wont be a bottleneck for the 660.
I would really appreciate a pro to expand on the subject and create a refference topic for everyone who searches for information on the subject.
Now... The aftermath....