IBM / Lenovo 64 GB Kit (4x16G) DDR3-1066 ECC Reg DDR3 DIMM 4x16 Kit Notes:Systems with the (#8350) 4-core processor module do not support the 16GB (2x8G) or 32 GB (2x16G) kits. Memory riser cards support memory configurations of 2, 4, or 8 DIMM with 8GB kits. With 16GB kits memory riser cards only support configurations of 4 or 8 DIMMs. DIMMs installed in sockets 1, 2, 3, and 4 must be identical. DIMMs installed in sockets 5, 6, 7, and 8 must be identical, but can be different from the first four sockets.