i got my zalman installed, my idle is bout the same 29C, but my load is lower at about 35-36C playin RO for ut2k3. So that makes it bout 3-4C drop in temp, im usin AS5 by the way. This was my first time removin a HSF and installin a new one. I cleand the heatspreader on the p4 hsf as best as i could, got alll that black crap off of it.