Since, I cannot post in Overclocking section, I posted it here (someone from staff can check it out, if necessery)

Specs
Asus P5K-E Wifi/AP P35 chipset
Intel Q9550 E0
2x2Gb Supertalent 800Mhz

My question is, is there a FSB wall on P35 chipset, so I can overclock it only to 3.9Ghz , and get to the OS, or could it be a CPU fault?
Ive overclocked the RAM too, so that shouldnt be an issue.
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Ive just bought this on 775 socket, because Ive just bought this motherboard, and I still have DDR2 rams, I know I could get i7 for a little more money, but the RAM prices are a little too high.

Ive also have Mugen 2 with 2x12cm fans for in and in the case 12cm and 20cm one, temps with 3.9Ghz and Prime95 doesnt go over 60°C.

Ive readed that setting the NB voltage higher, might solve that, but im a little sceptic, that I will burn the motherboard.

Any suggestions what should I do?