You'll either hit a point where you reach a hardware limit (non-stable, which is generally a result of pushing the RAM too hard before anything else)
So what you're saying is to not worry so much about overclocking the RAM, but instead focus on just the CPU? I ran the heavy CPU stress test in prime95 for about 5 hours with no errors. So I decided to switch to the heavy RAM testing and started running into errors after about 30 minutes. I can't say what caused the error because I have no clue. Not sure if it was bad timings or that stuff was running too fast. The board supports up to 1866 RAM and I only had mine at just under 1600 which is what the RAM is rated for anyways. Possibly need more voltage? Back to the CPU now. I'm almost positive I should be able to hit 3.6ghz on air cooling, and possibly 4ghz on water. I'll fiddle with some more settings to see what I can get.