128MB, 256MB, 512MB (x64, SR) 240-Pin DDR2 SDRAM U.
Micron
MT4HTF6464AY - 512MB DDR2 SDRAM UDIMM
128MB, 256MB, 512MB (x64, SR) 240-Pin DDR2 SDRAM UDIMM Features DDR2 SDRAM UDIMM MT4HTF1664AY – 128MB MT4HTF3264AY – 256MB MT4HTF6464AY – 512MB Feat.