I found this on ebay when I was looking for more memory for my Dell R815, I had to buy just for the memory which is 16GB sticks.
Silicon Mechanics Supermicro CSE 818 128GB RAM 2X60GB SSD AMD 4 Proc 2 3GHz | eBay
Silicon Mechanics Supermicro CSE 818 128GB RAM 2X60GB SSD AMD 4 Proc 2 3GHz | eBay