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High-Speed Best Price DDR3 Memory Upgrades

4GB DDR3 1066MHz PC3-8500 204PIN Laptop Memory SODIMM

4GB DDR3 1333MHz PC3-10666 204PIN Laptop Memory SODIMM

2GB DDR3 1066MHz PC3-8500 240PIN Desktop Memory DIMM

4GB DDR3 1066MHz PC3-8500 240PIN Desktop Memory DIMM

4GB DDR3 1333MHz PC3-10666 240PIN Desktop Memory DIMM

4GB DDR3 1333MHz PC3-10666 240PIN ECC Server Memory DIMM

DDR Memory Upgrades | DDR2 Memory Upgrades

DDR Memory RAM PC2100 266Mhz Memory DIMM | PC2700 333Mhz DDR Memory DIMM | PC3200 400Mhz DDR Memory DIMM PC2100 266Mhz DDR SODMM | PC2700 333Mhz DDR SODMM | PC3200 400Mhz DDR SODMM

DDR SDRAM for desktop computers DIMMs have 184 pins (as opposed to 168 pins on SDRAM, or 240 pins on DDR2 SDRAM), and can be differentiated from SDRAM DIMMs by the number of notches (DDR SDRAM has one, SDRAM has two). DDR for notebook computers SO-DIMMs have 200 pins which is the same number of pins as DDR2 SO-DIMMs. These two specifications are notched very similarly and care must be taken during insertion when you are unsure of a correct match
DDR PC2100 266Mhz	256MB DIMM	512MB DIMM	1GB DIMM
DDR PC2100 266Mhz ECC	256MB DIMM	512MB DIMM	1GB DIMM
DDR PC2100 266Mhz ECC Registered	256MB DIMM	512MB DIMM	1GB DIMM	2GB DIMM
PC2700 333Mhz 184PIN DDR Memory Upgrades
DDR PC2700 333Mhz	256MB DIMM	512MB DIMM	1GB DIMM
DDR PC2700 333Mhz ECC	256MB DIMM	512MB DIMM	1GB DIMM
DDR PC2700 333Mhz ECC Registered	256MB DIMM	512MB DIMM	1GB DIMM	2GB DIMM
PC3200 400Mhz 184PIN DDR Memory Upgrades
DDR PC3200 400Mhz	256MB DIMM	512MB DIMM	1GB DIMM
DDR PC3200 400Mhz ECC	256MB DIMM	512MB DIMM	1GB DIMM
DDR PC3200 400Mhz ECC Registered	256MB DIMM	512MB DIMM	2GB Kit	2GB DIMM

200 Pin DDR Memory Upgrades
PC2100 266Mhz 200PIN DDR Upgrades
DDR PC2100 266Mhz	256MB SODIMM	512MB SODIMM	1GB SODIMM
PC2700 333Mhz 200PIN DDR Upgrades
DDR PC2700 333Mhz	256MB SODIMM	512MB SODIMM	1GB SODIMM
PC3200 400Mhz 200PIN DDR Upgrades
DDR PC3200 400Mhz	256MB SODIMM	512MB SODIMM	1GB SODIMM

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DDR2 Memory RAMPC2 3200 400Mhz DDR2 Memory DIMM | PC2 4200 533Mhz DDR2 Memory DIMM | PC2 5300 667Mhz DDR2 Memory DIMM PC2 6400 800Mhz DDR2 Memory DIMM | PC2 3200 400Mhz  Memory DDR2 SODIMM | PC2 4200 533Mhz Memory DDR2 SODIMM PC2 5300 667Mhz Memory DDR2 SODIMM | PC2 6400 800Mhz Memory DDR2 SODIMM

DDR2 introduces some new features which allow it to ramp up to much higher speeds (with correspondingly higher bandwidth) and higher memory densities, all the while using less power. DDR2 memory uses a new form factor, a 240 pin DIMM (Dual Inline Memory Module) which is *not* compatible with current DDR memory slots. Upcoming chipsets by Intel and other manufacturers will support DDR2 specifically, and are not backwards compatible.
PC2 3200 400Mhz 240 Pin DDR2 Memory DIMM
DDR2 PC2-3200 400Mhz	512MB DIMM	1GB DIMM	2GB DIMM
DDR2 PC2-3200 ECC 400Mhz	512MB DIMM	1GB DIMM	2GB  DIMM
DDR2 PC2-3200 ECC Registered 400Mhz	512MB DIMM	1GB DIMM	2GB  DIMM	4GB  DIMM
PC2 4200 533Mhz 240 Pin DDR2 Memory DIMM
DDR2 PC2-4200 533Mhz	512MB  DIMM	1GB DIMM	2GB DIMM
DDR2 PC2-4200 ECC 533Mhz	512MB DIMM	1GB  DIMM	2GB DIMM
DDR2 PC2-4200 ECC Registered 533Mhz	512MB DIMM	1GB DIMM	2GB DIMM	4GB DIMM
DDR2 PC2-4200 ECC Fully Buffered 533Mhz	512M DIMM	1GB DIMM	2GB Kit	4GB Kit	8GB Kit
PC2 5300 667Mhz 240 Pin DDR2 Memory DIMM
DDR2 PC2-5300 667Mhz	512MB DIMM	1GB DIMM	2GB DIMM
DDR2 PC2-5300 ECC 667Mhz	512MB DIMM	1GB DIMM	2GB DIMM
DDR2 PC2-5300 ECC Registered 667Mhz	512MB DIMM	1GB DIMM	2GB DIMM	4GB DIMM
DDR2 PC2-5300 ECC Fully Buffered 667Mhz	512MB DIMM	1GB DIMM	2GB Kit	4GB Kit	8GB Kit
PC2 6400 800Mhz 240 Pin DDR2 Memory DIMM
DDR2 PC2-6400 800Mhz	512MB DIMM	1GB DIMM	2GB DIMM	4GB DIMM
DDR2 PC2-6400 ECC 800Mhz		1GB DIMM	2GB DIMM	4GB DIMM
DDR2 PC2-6400 ECC Registered 800Mhz		1GB DIMM	2GB DIMM	4GB DIMM
DDR2 PC2-6400 ECC Registered Low-Profile 800Mhz		1GB DIMM	2GB DIMM	4GB DIMM
DDR2 PC2-6400 ECC Fully Buffered 800Mhz		1GB DIMM	2GB DIMM	4GB DIMM

200 Pin DDR2 Memory SODIMM
PC2 3200 400Mhz 200 Pin Memory DDR2 SODIMM
DDR2 PC2-3200 400Mhz	512MB SODIMM	1GB SODIMM
PC2 4200 533Mhz 200 Pin Memory DDR2 SODIMM
DDR2 PC2-4200 533Mhz	512M SODIMM	1GB SODIMM	2GB SODIMM
PC2 5300 667Mhz 200 Pin Memory DDR2 SODIMM
DDR2 PC2-5300 667Mhz	512MB SODIMM	1GB SODIMM	2GB SODIMM
PC2 6400 800Mhz 200 Pin Memory DDR2 SODIMM
DDR2 PC2-6400 800Mhz		1GB SODIMM	2GB SODIMM