ASRock P67 EXTREME4 GEN3 LGA 1155 Intel P67 SATA 6Gb/s USB 3.0 ATX Intel Motherboard
CORSAIR Professional Series HX750 (CMPSU-750HX) 750W ATX12V 2.3 / EPS12V 2.91 SLI Ready CrossFire Ready 80 PLUS SILVER Certified ...
16 GB of memory
SAMSUNG Spinpoint F3 HD103SJ 1TB 7200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive
Im playing counter strike global offensive game and sometimes i still get lags on the game. i want to boost my fps on games and no lags. should i buy another Sapphire Radeon HD 2GB 6950 and do crossfire? or buy a new single high end card? also im not sure if my current power supply will handle crossfire. should i also buy a new power supply if im upgrading my graphics card? thanks in advance!
I think another 6950 in xfire is not a good option. It was a nice card but is more than 3 years old. And PSU update is highly possible.
If you want fast update - check tom's recommendations for the month http://www.tomshardware.com/reviews/gaming-graphics-car... GTX 760, 770 for $250 - $350 look like nice options.
Will be significantly faster that the single 6950 and will work fine with the current PSU.
If you can wait a bit - nvidia just released first video cards from the new Maxwell generation (750, 750TI), no doubt more powerful variants are also coming.
Me personal preference - I get always latest, may be middle or lower segment but latest tech) Technologies change too fast in the computers to get older tech. This is personal decision though.