SLI GTX 460 with GT 240 Physx.. help

Alright so right now im running SLI GTX 460 with a 8800 GTS 512mb dedicated for PHysx, i been hearing a lot about this GT 240 card saying its the best to run PHysx dedicated card and its only around $70, my question is should i keep my setup or upgrade to the GT 240? im trying to get ready for Mafia 2

No , I would not. The cards have completely different architectures but have similar performance. PhysX uses the cuda cores your 8800 has 112, the gt 240 has 96.
The gt240 at 70 bucks is not a bad deal, they are on the 40nm process. If you had another use for your 8800 maybe, but not necessary , its not a upgrade.

I believe CUDA is based on nvidia's stream prossesor technology, now called ''CUDA CORES''. If I'm right even 8400GS' are able to run CUDA (of course, VERY, VERY slowly)

+1 ^ mousemonkey

set the 8800 GTS as your dedicated physx card in the nvidia setup settings!! then run your tests again!!

its been set as the dedicated card i take it something is wrong then, i should sell the 8800GTS and get the GT 240

You FPS are going to be lower enabling physX, it takes down the fps quite a bit.
This is using a gtx 260 as a dedicated physX card.
http://www.hitechlegion.com/review [...] ed?start=3

hmmm

Dedicating a card for physx is typically a waste of time and isn't worth it. If you need the bump in performance the nuke the shader on one or both of your cards. You can have differential clocks and it wont hurt performance. Having a dedicated card only increases power consumption and more lag on the cpu. You should just stick with what you have and don't spend a dime on the gt240.