Best (and shortest) stability testing software

[Tomek20225]

When I was learning how to overclock CPU I get to know what is the stability test.

Right now to check if my OCs are stable I use the Prime95 or Aida64, but you have to wait SOO LONG to check if everything is all right,
So I ask you what is the shortest and best stability testing software.
Until I upgrade that PC, I use AMD Athlon II X4 635 with the stock cooler and FOXCONN A6GMV motherboard. The PSU is a noname, but my PC's power consumtion is so low, that even the mighty lord Gaben would say it will be ok.

I got it to 3,3Ghz (I'm testing it exactly at the moment of writing this post) and I'm pretty sure I can push it further.

[Levent]

I only use Intel Burn Test and works fine for me never had unstability issues if cpu passed 20 very high presets.

[LogicalDrm]

The point of stability testing is that it isn't flash and ready. OCCT takes 3h which is in my opinion much better than 24-48h which is recommended with Prime95.