E8400 Overclocking Help!

I recently decided to overclock my Intel Core2Duo E8400 3.0ghz to 3.6ghz. I know what to do and how to do it, but I can't seem to stabilize the system. It runs about 50c underload when I get it clocked so I don't think its over heating.

So here's the settings for the longest lasting overclock before it froze up.
Vcore - 1.34
FSB - 1600
NB - 1.34
Multiplier - 9

I've got the Asus P5N-D motherboard. If anyone knows anything that could help me out that would be awesome. Thank you.