Hi, I have an Iwill KK266 (rev.1.2) and an Athlon 850, I'm looking at upgrading my proc. to a 1.4Tbird or an XP. I'm leaning towards the 1.4Tbird cause I've heard that the KK266 sometimes has "issues" with the XP. I'm asking for advice/experience cause I don't want to throw away money on a processor I can't use like an XP, but I'm not afraid to unlock the XP and I'd rather have the lower power consumption and SSE included in the XP. Thanks for the help guys/gals...