Hey guys, I have an upcoming build with an LIAN LI PC-9F and I read in a feedback that a Modular PSU is a must for this case. Can someone find me one on newegg to go with this case? Ill be using i5 2500k for pcu and Nvidea GTX 560TI gui. :
A modular power supply is one that the cables are not integrated into the unit itself. You only attach the connectors that you need so you aren't left with a bunch of unused cables that just take up space after you have connected everything, this allows for a much nicer/cleaner install.
For a single GPU build you can get away with 550W-650W, for a multiple GPU rig you would want more of course.
There's a few examples of some quality units that would be more than enough power for a single GPU gaming rig, assuming it doesn't have tons of extras like lights, water cooling, tons of fans, multiple raid arrays, etc.