256MB, 512MB, 1GB (x64, SR) 240-Pin DDR2 SDRAM UDI.
Micron
MT8HTF12864AY - 1GB DDR2 SDRAM UDIMM
256MB, 512MB, 1GB (x64, SR) 240-Pin DDR2 SDRAM UDIMM Features DDR2 SDRAM UDIMM MT8HTF3264AY – 256MB MT8HTF6464AY – 512MB MT8HTF12864AY – 1GB Feature.