Found these Dell PowerEdge C6220 4 in a 2u chassis (no hard drives), looks like 2x E5-2665 CPU and 128GB Ram per node. Also looks like they have the 10GB mezzanine card. Not a screaming deal, but they are best offer so you may be able to get a better deal.
Dell Poweredge C6220 LFF 4-Nodes 8x E5-2665 512GB NO HDD 2 x 1400W | eBay
Dell Poweredge C6220 LFF 4-Nodes 8x E5-2665 512GB NO HDD 2 x 1400W | eBay