Best Motherboard for a Large Memory System?

kimanaw writes "Due to a particular infrastructure need, and increasing OS support for 64 bitness, I'm looking into building a large memory server box (at least 16 gigs, possibly up to 64 gigs, probably config'ed into a big ramdisk). I only need a single CPU, and just minimal disk; most prebuilt systems w/ large memory seem to focus on more CPus and big RAID, all of which (over)inflate the pricetag. I've searched several websites (including Tom's Hardware), and I've googled, but can't seem to locate any commercially available AMD MBs supporting more than 4 sticks of RAM, or 4 gigs. Have any Slashdotters built a big-RAM server? Any pointers, hints, and tips much appreciated."