Memory Overclocking Questions

xXCrossfireXx

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I'm really confused about memory overclocking. I keep hearing it'll improve multi core tasks, so I was wondering a few things.

First off, I really don't get it, what's an XMP profile and how can I overclock with it?

Second, if I overclock, will the CAS latency go up, and by how much? Is there a way to reduce how much the CAS Latency goes up?

Finally, hows 1600 CAS 9 for multi core tasks, specifically video editing, rendering, and code compiling? Will something like 2133 MHz CAS 9 make a huge difference compared to something like this in multi core apps?

 
Solution
If the sticks will OC to 2133/11 you might see abit of an increase, if it takes CL12 or higher to run at 2133 you may see a performance decrease

Tradesman1

Legenda in Aeternum
An XMP profile is provided to make setting the DRAM up easier, the BIOS reads the profile and sets it up for you rather than you manually having to enter data rate, timings and voltages. When enabled it should run to the DRAMs specs. 1600/9 will work, for things like video, multi-tasking, etc faster is better1866 would be a small increase, 2133 will be more noticible
 

xXCrossfireXx

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I was actually shooting for 2133 MHz. With 1600 Cas 9 RAM, will it still help to overclock to 2133, because won't the CAS Latency go up?