I can tell you that the p5kc has a very weak memory controller, and will most likely not run ddr3 1333 unless loose timing are used. 8 latency or worse, even then no guarantees. The best I've been able to get out of mine is 1245mhz cr1 at 6-6-6-18 timings. And that nets the lowest stable latency, tested in Everest I can get with that board.
The p5kc hates high frequency ram, do a quick google and you'll find the problems people are having with it.
yes,my buddy experienced some problems related to kingmax ddr2 800 memory on that mobo. couldn't start it every time,and had to pull the plug from psu. after reconnecting,sometime it start at first,sometime it won't.
we realized that problem is somehow related to memory,and solved the problem with other moduls.