Just to clarify, LGA 1156 and P55 is fine for probably two GPUs, whereas H55, 57 and the Q# aren't.
Anyway the Corsair 520W isn't enough for two 5850s. You would need probably a 750W PSU as these are the ones that typically have enough connectors for two.
I'm not sure about your last question, it probably depends on the game in many cases.
yes of course i wouldn't be using this monitor but ok, 750 for two and 520 for one.
i forgot to mention but i have this other components.
don't know if they draw out too much power or not, but just to be sure will drop them here.
Creative X-Fi Gamer Edition
Some usb devices
LG DVD-RW/DVD+RW Drive
Front Bay LCD Display and fan controller.
Maybe a bluray in sometime.
Ok forgetting the Crossfire setup, the Corsair 520W modular would do the job, taking into consideration overclocking?
or should i grab the 620W just to be safe?
(i've been reading and found out that the HX series are rather good quality PSU)
as i intend on keeping the pc for atleast 2-3 minimum, i think a good PSU is a must.