stop error 124 means Vcore not enough.
just because others can get theirs to higher clocks with less Vcore doesn't mean you can too.
mine 2600k needs 1.36V set in BIOS with levle 2 VDroop for 4.5GHz. some can do better, some can do worse. some need almost 1.4V to get to 4.5GHz. think how they must be complaining!