Stable OC?

[pHrantiK]

Hi I am just wondering if anyone has a similar build to mine and what their highest Stable OC was.

Mobo: Gigabyte G1 Assassin (rev 1.0)
Processor: Intel core i7 920
Cooler: Antec Kúhler H2O 620 CPU Watercooler
Case: Cooler Master CM StormTrooper

Any other info needed please let me know but I'm guessing that is it

Thanks!