This Sun 511-1152 compatible 4GB DDR2-667MHz dual rank fully buffered ECC 1.8V 240-pin CL5 factory original FBDIMM is 100% guaranteed to be compatible with your system and to work right the first time. All of our server memory is built to strict JEDEC standards at one of the tier 1 facilities (Samsung, Micron, or Hynix). Our products are also guaranteed by federal law to not affect or void OEM warranties.

• DIMM 4 GB of memory to refine your computer's performance
• 240-pin-pin DDR2 SDRAM operates at up to 400 MHz data bus speed with minimal power consumption and as a result, you get optimal computer performance with an improved memory heat dissipation
• 667 MHz of memory speed makes your computer perform like an athlete