i5-2500K/2600K batch number and o/c results

[Shrekogre]

the nearest MC is two train stops away from me... i can't look and pick batches by hand in the store, so i have to resort to blind luck.

Where do you guys recommend buying a chip online? So far i've bought 2 from egg, and 6 from MC online... both from egg were costa rica chips (one had a terrible 52 wall... the other was low voltage, sort of.. super pi'able 32m @ 1.47v @ 5.1ghz.)
Looking for low voltage chips for 24/7 though.

The chips i got from MC were ok, but not low voltage... low volt chips seem to be absolutely random with no pattern in batch numbers

I had a cpu which doesn't want to do beyond 5.2 ghz @ any volts and 5ghz is a little way too high volts. but it can do 5.78ghz on ln2 @ 1.6v