Duinno why, but I have got into AIO setups and I have tried to get a different one for each PC, and sure, I am about to say something incredibly stupid here, because I have not actually done any trials or rotating to find out any different results, but they have all coolerd roughly about the same as each other with very little actual differece!
The only two that I did actually swap over were the AlpenFohn ( or whatever the hell it is ) and the Cool-IT ( dirt cheap and nasty ) and with both PCs, the CPU was at 47c after a bit of game playing.
For a giggle, I am more than happy if you want me to try out any particular setup on any particular CPU if you want? - Obviously, only if I have those parts, but I am a PC hoarder so try me?