bassejepsen :
Hello, I use a ENGTX560 TI card, is it worth useing another 250 card for SLI PhysX?
Have someone tryed it?
if so how much performance boots I can expect?
I am useing an Asus P8Z68-V PRO motherbord
If you have the money go for it.
It almost doubles the performance in most games. ( depends maybe also a bit on your processor and the number of ram you have now )
See for yourself ; http://www.techpowerup.com/reviews/NVIDIA/GeForce_GTX_560_Ti_SLI/
Also make sure you have enough power from your PSU, i guess minimal 750 W for sli but it could be even more, i don't use sli. ( can't afford it ) You can figure out here how much you need ;
http://extreme.outervision.com/psucalculatorlite.jsp
Get a decent psu if needed, not a cheap one, it needs a stable, preferably single, rail with enough amps.