If you can run Prime95 for 71 minutes, I would say you are good and those temps are very good!

Got an error from one worker after 80 mins, no BSOD, but I've upped the Vcore to 1.295 and starting again with the Torture Test. Thanks for the input.

Thanks Speedbump and everybody for your kind advice. I've been reading about this stuff for ages, well before I had a rig that was realisticly overclockable, and I pretty much expected the auto overclock to use slightly excessive voltage. In some ways it's a shame that this site doesn't save your old comments with your old sig and you'd know what I mean!
Anyway, I've unpressed the button and OC'ed manually with a x45 multiplier a vCore of 1.28(cpuz shows 1.272) and RAM at 1600 Mhz (I set that when I put the rig together).
The result is here http://valid.canardpc.com/show_oc.php?id=2140622
That failed Prime 95 as well after 40mins so I tried again at 1.305V @4.5GHz, after 130 mins stable with 60C max on the cores, happy days.
So I have a clock speed just shy of 4.5Ghz and a max temp of 60C while running Prime95 torture test, compared with 4.2Ghz at 63C(max) with a 1.344 Vcore. Manual overclocking FTW

Congrats! Time to change the sig with the new "clock".

Man that machine must sing at that speed.

Done! Thanks mate.



It certainly does, I must say I didn't quite expect to notice the difference in everyday use as much as I do . I'm really pleased that the difference doesn't just affect artificial benchmarks etc.
Thanks for your advice and to everyone else who posted