Ok. It runs fine on my server. It never able to run OCCT benchmark. Looks like it is my PSU that's causing the problem.
Last thing. What PSU do you guys recommend me getting? Prefer a full modular, Silver 80+, 900W+.
Edit: I'm planning to upgrade to the 2011 Socket with 2x7970 Crossfire with the GTX 650 as PhysX.