RAM overclocking

[Dan2kx]

Hi guys, quick question, any worth in overclocking ram? how do ya go about it? spec in sig, i tried briefly the other day to whack my 1866 upto 2133, but didnt post and i had to clear CMOS, so i gave up instantly, lol.
This was with timings set manually, as per XMP (but not using as XMP).

 

[Dan2kx]

Timings currently 9,10,9,9,28 if memory serves. What would be worth trying?
Voltage set to 1.5, on auto it was up at 1.67!!

Before I bought the hardware, I read that since max ram (without OC) is 1600, the higher you go the less gain, which is why I cheaped out and went for the 1866 kit