請問金士頓記憶體序號後的字母代表什麼? (紅色顏色部份)
http://www.ec.kingston.com/ecom/configurator_new/modelsinfo.asp?id=8&SysID=62382&root=tw&LinkBack=http%3A%2F%2Fwww.kingston.com%2Ftaiwan&Capacity=Capacity&Speed=Speed&DIMM=3&ErrCheck=3&Rank=Rank&Chip=Chip&Submit=Refine+Search
KVR1333D3D8R9SK2/4G 4GB 1333MHz DDR3 ECC Reg CL9 DIMM (Kit of 2) DR x8 w/TS
KVR1333D3S4R9SK2/4G 4GB 1333MHz DDR3 ECC Reg CL9 DIMM (Kit of 2) SR x4 w/TS
http://www.ec.kingston.com/ecom/configurator_new/modelsinfo.asp?id=8&SysID=62382&root=tw&LinkBack=http%3A%2F%2Fwww.kingston.com%2Ftaiwan&Capacity=Capacity&Speed=Speed&DIMM=3&ErrCheck=3&Rank=Rank&Chip=Chip&Submit=Refine+Search
KVR1333D3D8R9SK2/4G 4GB 1333MHz DDR3 ECC Reg CL9 DIMM (Kit of 2) DR x8 w/TS
KVR1333D3S4R9SK2/4G 4GB 1333MHz DDR3 ECC Reg CL9 DIMM (Kit of 2) SR x4 w/TS