What???
Do you know what CPU cache is? I doubt. At least read wikipedia:
http://en.wikipedia.org/wiki/CPU_cache[
^]
It would be a disaster if one could modify those cache values. CPU cache and runtime cache is totally different things, on totally different level of functionality regarding running code. The first one is on the lowest, whilst the other one is on the highest edge of this structure.
You can't directly influence the behavior of the CPU processing pipeline - where CPU caches work. You can, however optimize - but less in .net :(
Some lecture:
http://onward-conference.org/2011/images/Pueschel_2011_AutomaticPerformanceProgramming_Onward11.pdf[
^]