E6300 overclock problem

[ben_moore34]

Hello

I have an E6300 on a Gigabyte 965P DS3 motherboard and 2 * 1gb Geil 5300.

I overclocked the system a while ago
Processor at 333 Bus speed so about 2.3Ghz
Memory at 1:1 ratio so 666MHz
PCI-E at 100

I left the voltages all to auto

All worked well, every now & then (about once every 3 weeks or so) when I turn on the pc it just keeps re-booting and reverts the settings all back to stock.

Anyone know of anything I may need to alter?

Cheers

 

[ben_moore34]

Yeah maybe it's my board then. I tried the voltages on manual.
The overclock to 2.3Ghz will be fine and stable for days even weeks sometimes then sometimes suddenly the whole machine just turns off then refuses to POST unless powered off at the mains for 10 mins or so.