i remember seeing somewhere where someone tryed to supercool their entire system... down to like phase change temps all over... the system booted fine... and the processor worked well.... but other components were messing up... i believe the ram was one of them... there is a point where things can be too cold... the difference between ram and a cpu is that the cpu uses many watts of power... and ram doesn't... if u look at the specs of ddr most only draw milliAmps of current... which equates to very low wattage considering ddr is powered on significanly low voltage... with this little power usage and little heat output there isn't much to offset the cooling... cpu generates lots of heat and can stand being at -50... i know pelts don't go down that low... but i seriously don't think that ram will benefit much from it...
the other thing to consider is that we may not be the hardest of hardcore ppl but go look at the hard core... if it was such a benefit to actively cool their ram it'd have been done by now and would be very popular... japanese do pretty freaky stuff every once and a while... but when something is successful we do it too... and i haven't seen it anywhere...
just my 2 cents...
Go for it... it's ur ram, ur time, and ur money...
Just tell us how it goes
Cyph3r