Another little update about AS3 for those considering switching from the stock thermal pad...
I installed MBM5 and my full load temp is now 47C - must be the AS3 settling in because yesterday it was 50C.
Today I found that my idle temp is 31C!! Again, Asus probe (or the bios) has a floor error and its lowest reading is 40C. I wish I had downloaded MBM5 earlier for a comparison against the stock thermal pad
So just a little summary. It appears, at least based on my experience, that the Costa Rica chips do not differ in any significant way as compared to the Malay chips. Still running at 150FSB, Turbo 1, Mem CAS 2, and vcore set to 1.6 (~1.65 according to MBM5) without a single lockup or hickup. This is after multiple hours of Prime 95, 3 runs of 3dMark2001 and a few hours of Medal of Honor. And again, no problems with any of my 7 USB devices or my Promise Fasttrak 100 controller.
I'm willing to bet that the few that are experiencing problems going above 133fsb have a confounding variable at play that is not being addressed (read memory and/or powersupply).
Hello weekend!!