I'm interested to see what kind of difference you experience. From talking to Danny at D-TEK, he's had users reports as little as 1-2C difference. Then they replace the TT rad and pump, and all of a sudden it's more like 10C.

Apparently replacing just the rad or just the pump has the same effect (very little) unless you replace the CPU block as well though.

Haven't tested it myself though, so this is just hearsay.