Prime errors

[Andy298]

Trying to get to 2.3Ghz and got this error after 10 minutes...

FATAL ERROR: Rounding was 0.484375, expected less than 0.4
Hardware failure detected, consult stress.txt file.

Upped the volts from 1.450 to 1.475 and got similar error

FATAL ERROR: Rounding was 0.5, expected less than 0.4
Hardware failure detected, consult stress.txt file.

Upped volts to 1.50, ran for about 30 minutes and fell over with a different error

FATAL ERROR: Resulting sum was 5318893326385496, expected: 5318893326647399
Hardware failure detected, consult stress.txt file.

Not sure if I should try to up the volts a bit more whilst still on stock cooling. I've had the rounding errors before when trying to get to 2.2 on 1.425 volts but managed to get past them by upping volts. Any ideas what this error is?
Sorry if it's a stupid question but pretty new to overclocking

 

[Andy298]

Thanks for the replys guys.
Mav, I have to disagree with you regarding prime. I'd say most of the folk on this board use it, whilst I've only ever seen a handful of overclock posts from people who use SNM.
My HTT multi is on 3 at the moment. 4 is the default as I'm running a skt754 and max bus is 800MHz. My ram is on a divider also at 166 (DDR333) and temps are at 42ºC under load. At 2.2Ghz with 1.450v Prime was stable for well over 20 hours. Prime test I'm running is large FFT's, max heat and power.
Mikebert4, I might drop you a PM if I get stuck