It's a difficult question obviously, as the same crash can mean many different things. Despite this it's probably the most important thing to know when working out why your overclock isn't stable, so please contribute any patterns you've noticed while overclocking. I'll make a start and maintain this post with whatever is added.
On P45,
Blue screens tend to mean memory problems, increase vdimm or northbridge.
Failing several hours into prime, more vcore.
On X58,
System freezing suggests memory failing, more qpi or possibly more vdimm.
Rebooting, more vcore needed.
Erratic behaviour over 200bsck, increase pci frequency a couple of Hz
I really did think I'd come up with more points than that, but apparently I can't. Please contribute
On P45,
Blue screens tend to mean memory problems, increase vdimm or northbridge.
Failing several hours into prime, more vcore.
On X58,
System freezing suggests memory failing, more qpi or possibly more vdimm.
Rebooting, more vcore needed.
Erratic behaviour over 200bsck, increase pci frequency a couple of Hz
I really did think I'd come up with more points than that, but apparently I can't. Please contribute
