I would bet you'd see a good 5-6 degrees Celsius drop by switching to AS5, as I've never seen anything work nearly as well. I don't know why the cooler manufacturers even try any more.
I'm using Zalman Super Thermal Grease.
Also, I'm using the onboard video card. Is it the PSU? The PSU is a 270W supply driving my motherboard, cpu, one DVD burner, one SATA HDD, and one USB all-in-one floppy drive card reader. Thanks for this info! I've been considering other heatsinks too.
I've got about 120mm of clearance before butting into the CD ROM drive. So I can't use my blue orb II, and my stock HSF is too hot. I'm considering the CNPS7000 from Zalman.
I'm having thoughts that it might be because of the pressure the clip applies to the HSF / CPU contact because the Zalman clip has a lot more tension. Ideas?