how overclocking ram works?

Answer 1

generally its the same as regular ram but with tighter timings .. it can also usually stand higher voltages and run at higher than standard clockspeeds and remain stable ... so if u are overclocking u can go higher without crashing ur system ..

Answer 2

You actually overclock the processor. But in the process of increasing fsb or clock speed you also increase the speed of the RAM. But then, processors usually have a lot more mhz headroom than RAM. So you tend to reach the mhz limit (unstable) of your RAM first. This is where overclockers use memory dividers. Many retail motherboards and all enthusiast boards have this feature. They simply downclock RAM to a lower level prior to increasing fsb. So it takes more overclocking mhz steps before you again reach the mhz limit of your RAM.

Afterwards you could back down the fsb a little and tune for the tightest memory timing that would be stable using stability/stress testing softwares.