Intel Desktop Board DX79SI Pictured
Check out the pgoto's pf the Intel Desktop Board Extreme Series DX79SI. A socket LGA2011 mobo that has eight DDR3 DIMM slots (four on either side of the socket, two DIMMs per channel).
LGA2011 supports quad-channel DDR3 memory, yielding 33% bandwidth gain over triple-channel DDR3 and 100% gain over dual-channel DDR3. Despite its large memory area, the DX79SI sticks to standard ATX board dimensions.