Hi, can any 1 plz help me out. i've got a P4 1.8 Gh with the above Mobo, with 256 PC266 and 256 Pc2100. everyting was working fine. some time back i've been having cmos battery prob, and i had to replace the battery. after that, weird, My bios shows only 384 MB available even windows do so. i have remove the Pc266 and it shows 256 MB Replaced it and removed the Pc2100, and it shows 128 MB Even interchanged the slots, but the same. Cpu speed: manual Cpu Freq Multiple :18x Cpu\Pci Freq :100/33 CPU\memory Feq :Auto i changed the cpu\memory freq to 1:1, restarted, bios shows 512 MB, but windows dows not load. getting missing config.sys or Ntfs.sys missing. restored it to Auto, windows starts, but getting only 384 MB. Even loaded bios defaults, still the same.