Mine runs 1066 (8*133) stable at 1.85Vc and 3.8Vio with CAS 3-3-3, but I don't like the high Vio, so I took it a few notches down. (maybe it's my crap SDRAM) 129 or 133FSB is not much of a difference since it doesn't perform like a PIII at that speed anyway. The Celemine performs like a PIII, that runs 150Mhz to 200Mhz slower in general. The only advantage my system has is in the iBX chipset, which has better memory bandwith, even at CAS3 than Via has at CAS2 sometimes...