The Tornado puts out 84 cfm I believe while the TMD is 36 cfm. For comparison sake, I went from a Tornado to a 48 cfm fan and my temps changed from 34C under the Tornado at load to 40C with the 48cfm. My guess is that you're looking at 10C+ going from that Tornado to the TMD, but on the plus side you'll be able to hear again and you won't feel that you're living next to your community airport any more.
Damn things are too loud, I've got one laying around that I use for testing maximum overclocking potential. Great CFM, but you'll go deaf or never get to sleep with it running in the same room.
techfuzz