I got a tube of that stuff, LOWERED My IDLE TEMP by 1C, under full load lowered by about 2-3C, so it's not really worthy of an "upgrade" over AS3, and there is virtually no difference between AS5 and Ceramique. Well that's from my experience there could be a margin of error in MBM5 but as long as i could tell, these thermal grease are really nice, so buy whatever's cheaper.
-Intel PIV 2.6C @ 3.575G -Asus P4P800 -OCZ Copper 2x256 4000EL memory @ 275mhz 3-4-4-8 -Sapphire 9800np @ 432/780 -SB audigy -120G Maxtor Diamond Plus9 S-ATA150 hdd -450 Enermax PSU