The 555 BE should not be unlocked on the ASUS M5A78L-M-LX. This board does not have 125W TDP processor support due to a low end 3+1 phase VRM system. You may have reliability issues while running with 4 cores at over the TDP limit. CPU throttling might be a frequent occurence, reducing your 100% load performance to levels below those previous to the unlock and OC. You sir need a new board!
Also with just 30A (360W 12V rail) on that Widetech "650W" (really an upbranded 400W) PSU I would be extremely cautious with trusting it to run a GTX 560 and an x4. The x4 at stock and the GTX 560 at stock will take up 275W on the 12V rail alone and that does not count the 12V voltage used by the fans, the chipset, etc. This is dangerously close to the limit. This isn't a high quality unit and Windtech has been known to be a very fishy brand.
With two possibilities of your system blowing up (well, the former is actually protected from that, but not the latter), I would seriously make a reconsideration as to operating this PC. Your components were cheap for a good reason. If you want safe, reliable operation, you should spend more and you should be prepared to spend more.
My recommendation: motherboard and PSU replacement, right away.
Edited by xd_1771 - 6/19/12 at 4:58pm