STATUS UPDATE #1
I actually had the 1 stick trial by error testing method in mind but I didn't do it becouse I never had to do this with any other boards I've tested. Before I saw your last reply, I tried ONE stick in each yellow/black/yellow/black slot and surprisingly I GOT RID of the unbelieable "overclocking failed & black screen" crap.
Again I tried with the 2nd stick in all 4 slots and same good result...
The result turned out to be that BOTH sticks were working perfectly fine and this also correspond to the Orthos blend and memtests I've tested.
The same problem arised again when I put both sticks back in DDR configuration. Black screen. This confirmed that the problem has nothing to do with the settings I configured.
I've never had a mobo gives such kind of problem BUT I've being awared and heard of this kind problem from other people's case and I just never thought it would happened to me.
As for the 4 or 8 pin CPU mobo connector. My OCZ 600w GameXstream PSU only has 4pin cpu power connector and it doesn't have 8pin EVP 12v. I know from here you probably will tell me to get a 8pin EVP 12v cpu mobo connector and try again. In fact, I actually just bought another new PSU - Corsair HX620w, which is the best in its category and supports 8pin EVP 12v. I bought it solely becouse I want to utilize the 8pin mobo connector and it's sitting right next to me sealed
HOWEVER...before I switch the power supply, I must tell you that I've had TWO 8pin connection mobos in the past and my current PSU with its 4pin CPU connector was working flawlessly even under OC'ed and Orthos stress condition for several hours.
The manual states either use 1x 4pin connector (not 2 x 4pin!) or just 1 x 8pin EVP 12v. Other P5K owners are also using 4 pin connectors and it's working flawlessly for them and not causing this problem I was experiencing...
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