That depends. Your PSU and Motherboard are able to hold significant overclock?
It seems the sweet spot for your CPU is around 1.1V, running @ 4.2 GHz. With stock voltage, the maximum clock people seem to achieve is 4.4 GHz. Anything above that and you'll need to push the voltages up a little. Whilst it all comes down to luck and silicon lottery, being able to run 4.4 GHz @ stock voltages is actually very significant. If you're aiming for more, it'll depend on your temps (Which should be low enough to give the CPU some headroom since you're running water) and, as I said, on the amount of stress your PSU and Motherboard can take. If your they are decent, expect some meaningful bumps on that 4.4 GHz value.