My current specs are in my sig and my power supply is a Silverstone Strider 750W. Basically i've been thinking about upgrading from xfire 4850's to xfire 5850's. I'd like to gain the extra performance as the 512mb on these cards has become a bottleneck. I'm also thinking i'd like to play with physx while using ATI for rendering...something about that just seems fun. From the research I have done i've found that 5850's consume slightly less power than my 4850's..so thats all good. Now, ive got a spare 8800gts 320mb and also a 9600gt which im thinking I can use as a dedicated physx card/ or sell along with the 4850's. I guess the questions I have for you are : Would xfire 5850s be worth it for my system, at 3.75Ghz would the Phenom be that much of a bottleneck? would my psu have enough grunt to power 2 5850's plus either of the two nvidia cards mentioned above?...and if not...what is the least power hungry nvidia card I could purchase to run physx? eg: 85/94/9500gt's I know a lot of you may want to say I should just upgrade my psu and then not have to worry about this sorta shit. The problem is I've just recently upgraded to a new case, finally have some great airflow and have all of my cables tied down. It'd be a mother of a job to re-wire everything all over again. Thoughts? Any advice is much appreciated.