doesnt like much over 4.3-4.4.... hmmm i'd read previously that it was more 4.7-4.8
if your only looking for 4.5 i would still go the 3570k.
Gigabyte's auto-tuning program easytune6 i believe is what i was thinking of, i think asus ROG boards and a few others provide OC buttons on the board.
Software overclocks these days are a lot more reliable and stable, and the gigabytes includes a built in stress test to be sure.
Also, THIS





