I'd recommend buying a regular heatsink fan combo and test it out under 'normal' circumstances. Visually inspect the cpu for hairline cracks or for damage to the edges.
The A7V133 is quite notorious for not booting. Make sure you have tried fully resetting the board by unplugging, removing the battery and shorting the cmos reset above it for at least 10s.
My advice, buy a really cheap duron or athlon (it doesn't sound like you are strapped for cash) and use that as a tester. Make sure you really know what you are doing, how you want to do it etc. and then start using more expensive cpus, otherwise I think you'll find your overclocking learning curve to be very steep and expensive.
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