For stress testing—use Orthus
To get your Validation done, you just need to grab the latest version of CPU-Z, head over to the very last column labeled [about], click on [validation], then hit [save validation file]... just make sure you don't rename anything before you click [save]. After that, you just upload it right here
http://valid.x86-secret.com/ and well, you know the drill from there...
As for temperatures, I always recommend checking them using
real temp settings...
When it comes to voltage, for a 45nm chip, I’d say a Max Vcore of around 1.45V is the sweet spot, though if you're feeling particularly daring, there really aren't any hard limits out there...😬
By the way, I used to push my Intel Core 2 Duo E6700 up to 1.75V back in the day, but personally, I wouldn't dream of pushing a 45nm chip past 1.6V for a benchmark run...