Product comparison · 2 memory modules

HP 4GB DDR2-533 vs HP 8GB DDR-400

Key differences

Internal memory
- 4GB DDR2-533:4 GB
- 8GB DDR-400:8 GB
Memory layout (modules x size)
- 4GB DDR2-533:4 x 1 GB
- 8GB DDR-400:1 x 8 GB
Internal memory type
- 4GB DDR2-533:DDR2
- 8GB DDR-400:DDR
Memory form factor
- 4GB DDR2-533:240-pin DIMM
- 8GB DDR-400:184-pin DIMM
ECC
- 4GB DDR2-533:No
- 8GB DDR-400:Yes
Memory clock speed
- 4GB DDR2-533:533 MHz
- 8GB DDR-400:400 MHz
Buffered memory type
- 4GB DDR2-533:Unregistered (unbuffered)
- 8GB DDR-400:Registered (buffered)

Differences highlightedShow differences only

Comparison of 4GB DDR2-533, 8GB DDR-400
10 specifications	A HP 4GB DDR2-533 View product	B HP 8GB DDR-400 View product
Features7 differ
Internal memoryDiffers	4 GB	8 GB
Memory layout (modules x size)Differs	4 x 1 GB	1 x 8 GB
Internal memory typeDiffers	DDR2	DDR
Memory form factorDiffers	240-pin DIMM	184-pin DIMM
ECCDiffers	No	Yes
CAS latencyKnown for one	4	Unknown — not stated by the source
Memory clock speedDiffers	533 MHz	400 MHz
Buffered memory typeDiffers	Unregistered (unbuffered)	Registered (buffered)
Memory voltageKnown for one	1.8 V	Unknown — not stated by the source

A dash means the value is not stated by the source. Unknown values are never counted for or against a product, and there is no overall score.