Originally Posted by CaptNKILL
By default, Prime95 is only a single core benchmark\stress tester. You have to mess with affinity settings to get it to utilize two cores. Orthos tests as many cores as you have available. It basically does the same thing, it just works better for multiple cores or CPUs.
The newer version of Prime that G80 just linked him to runs on all available cores.
You can use either Prime or Orthos, Redeemed. They both work the same. If you run Prime, just make sure you run the one that G80 linked you to or run two instances of it from different folder locations on your drive with one set to affinity 0 and the other to affinity 1.