HB52RF648DC-B, HB52RD648DC-B 512 MB Unbuffered SDR.
HB52RF648DC-B - 512 MB Unbuffered SDRAM S.O.DIMM 64-Mword 64-bit/ 133/100 MHz Memory Bus/ 2-Bank Module (16 pcs of 32 M 8 components) PC133/100 SDRAM