Asus P4B266/P4B266-C or Asus P4S333 are the best bet. The i850E is suppose to only support PC-800 because of the high priced PC-1066 modules. Im going to get a P4B266-C a 1.6a and 2x256MB PC-2100 later on. The 2 sticks of PC-2100 will then be used in the grainte bay chipset, using duel channel DDR266 (PC-2100) and 533Mhz fsb, in Q3-02.
SSXeon