RAM Speed vs CPU Support – What Happens with Faster RAM

Simple answer: It either will only see the max supported memory or it will not work at all.

My gut feeling says two things:

If it does work, you just will not see the extra memory, only the max the motherboard/chipset supports. If it doesn't work, it usually will just beep at you with a memory error and you will get no video responce. All depends on the motherboard depending on how it handles memory errors.

Someone on Yahoo answers says an interesting bit about getting a blue screen due to this:

In my experience, putting in more than the max amount of RAM as specified by the manufacturer will cause the computer to not boot up.

others claim:

Some won't POST, some will and simply BSOD (kernel panic, etc) with PFN_LIST_CORRUPT.

That said, the "max" memory isn't always the actual max. Case in point, Intel states the GL960 chipset (such as in my laptop) supports a max of 2GB of memory. 4GB is a no-go, but 3GB works.

In short, no, some benchmarks may reveal a small advantage, but its nothing you would notice in the real world.

http://www.overclock.net/intel-memory/129552-ram-faster-than-fsb-better-performance.html

This answer does not include overclocking the cpu fsb, which is another subject all together.