2GB, DDR3-1333 

1GB DDR2-800 

2GB DDR2-800 

High speed High bandwidth Low power consumption Reinforced Signal Integrity Supply voltage of 1.5V for 30% less power consumption than DDR2 

Transcend 4GB DDR3 SDRAM Memory Module - 4GB (1 x 4GB) - 1333MHz DDR3-1333/PC3-10600 - ECC - DDR3 SDRAM - 240-pin DIMM 

Memory Type DDR PC3500, SDRAM PC100 Bus Speed 1.33 GHz Interface DIMM Memory Standard DDR3-1333/PC3-10600 Memory Size 41 GB Memory Technology DDR3 SDRAM Memory Speed 1333 MHz