Uh... even 3 years ago, some x86 servers were supporting DIMM mirroring, which is "RAID1" . See http://www.redbooks.ibm.com/abstracts/tips0671.html http://www.

Uh... even 3 years ago, some x86 servers were supporting DIMM mirroring, which is "RAID1" . See http://www.redbooks.ibm.com/abstracts/tips0671.html http://www.redbooks.ibm.com/abstracts/tips0671.html and note publication date of 2007.