memory ram overclocking

You can usually set the RAM clock and timings on your BIOS. CAS latency is specially important. Higher frequencies and low latencies are harder to maintain with stability, so we usually need to loosen the latency a bit in order to increase frequency.

Try a few different settings and be ready to clear CMOS quite a few times, since a bad RAM setting will cause the PC not to boot.

If you would hear a word of experience, you will find that all that fiddling with your RAM will produce little to no result. It makes very little difference overclocking your RAM, and can make your system very unstable.
 
I don't see much to gain by overclocking your RAM, but if you are really willing for whatever reason, you can do it by changing RAM settings ont the BIOS. Your motherboard is certified up to 1866.

Anyways, I'm sure it will make very little improvement, and you will very likely have issues. I never damaged a RAM stick by overclocking it, by I can assure you running a computer 5% faster is no use if it restarts every five minutes.
 
To open up the BIOS, press "del" during boot. Once inside the BIOS setup, look through the sections until you find the RAM settings. There should be settings for the RAM frequency and various latencies/speeds.

Please only do this if you are confortable with clearing your CMOS. Your are most likely going to need it. If you don't know how, you may end up with a computer that does not start.