FPGA's in Opteron sockets

I’ve been visiting at Virginia Tech this week, and one very cool thing
I came across were these FPGA boards that plug into an Opteron socket.
Very low latency, very high throughput.

Virtex 4 in Opteron socket:
http://www.drccomputer.com/pages/modules.html

Stratix II in Opteron socket:
http://www.xtremedatainc.com/xd1000_brief.html

Eric