I'm trying to build a workstation with Opteron. After some research, I understand that only Opterons with C0 Stepping will support DDR400 Registered ECC memory, which I've already bought. The problem right now is that I can't find any Opteron 240 or 242 that have the C0 revision with part number ends AK, AL, or AM. Can anyone help me and let me know who is currently selling the newer revision 240 or 242 and where I could buy it?