a few ways you can use Dry Ice better.
1. get a container, remove the fan and place your radiator in there. or your res...
get Ethanol or basically alot of Everclear as thats the closest thing to that... pour alot of that in there, till if covers your Rad.
get Bricks of Dry Ice, usually from a specialty food place, or something similar. it's about a dollar a pound usually.
place brick of dry ice in ethanol or everclear (acetone if your in a VERY well ventilated area can work too)
this will get the ethanol incredibly cold.
the idea is to not freeze solid like water does.
a super cold liquid is more effective then a solid block of water.
thats why you need something like ethanol or such.
I haven't figured out why anti freeze and water just kinda sucks for this, but it doesn't do as well as just ethanol alone, atleast not for me.
oh yeah, and once you place the dry ice in the ethanol, remember to open some windows, it's gonna do this rolling fog thing, it's actually kinda cool, but it's also sucking the air out of the room.
not a good idea....
I have been playing around with dry ice for about 2 weeks now, I have old Epox KT-333 and a duron 800 here that can do 1.4 ghz with dry ice.
it's not that great, but I wanna REALLY learn the do's and don'ts of this stuff before I play with it on some expensive hardware.
the cool thing about dry ice benchmarking, is it's incredibly cheap.