Hello Friends! I have a Asrock 939NF4G-SATA2 Mobo. Bios p1.30 . Running XP+SP2 , AMD Athlon 3000+ (64bit) , 1 zion 512 MB 400 MHZ Ram. Problem is: In Bios It shows: Total Memory 512 MB with 64 MB Shared. Single Channel Memory Mode. DDR1: 512MB/166 MHz (DDR 333) Bios Version:939NF4G-SATA2 Bios P 1.30 Also Using CPUz Memory Freq. is shown 164.4 MHz I had taken out the RAM module to check it. It shows: ZHY400512 512MB DDR PC400 Q.C. OK 400512-601600961 It is an Original Module : Hologram ,sticker , transparent packing ..everything is there.. And also i bought it from a reputed dealer at kolkata : Supreme ! In the warranty challan it is also written ZION 512 MB 400 RAM.!! I can't figure out ...whats the prob... Why the bios/cpuz shows it to be 333 MHZ Ram. Any Ideas?