ZOTAC D2550-ITX (D2550ITXS-A) Tested memory Model Size DDR3 type Crucial CT12864BC1339.4FD 1GB DDR3-1333 Hynix HMT312S6BFR6C-H9 1GB DDR3-1066 Samsung M471B2873FHS 1GB DDR3-1333 Crucial CT25664BC1339.8FD 2GB DDR3-1333 Elixir M2S2G64CB88B5N-CG 2GB DDR3-1333 Hynix HMT325S6BFR8C-H9 2GB DDR3-1066 Kingston KVR1333D3S9 2GB DDR3-1333 Samsung M471B5673EH1-CF8 2GB DDR3-1066 Samsung M471B5673FH0-CH9 2GB DDR3-1333 HYNIX HMT351S6BFR8C-H9 4GB DDR3-1333 Samsung M471B5273CH0-CF8 4GB DDR3-1066 Samsung M471B5673EH1-CF8 4GB DDR3-1333 *All Memory tested at 1066MHz.