Product comparison · 2 memory modules

Kingston Technology 256MB DDR2 vs Kingston Technology 4GB 667MHz DDR2 ECC Fully Buffered CL5 DIMM (Kit of 2) Single Rank, x4

Key differences

Internal memory
- 256MB DDR2:0.25 GB
- 4GB 667MHz DDR2 ECC Fully Buffered CL5 DIMM (Kit of 2) Single Rank, x4:4 GB
Memory layout (modules x size)
- 256MB DDR2:1 x 0.25 GB
- 4GB 667MHz DDR2 ECC Fully Buffered CL5 DIMM (Kit of 2) Single Rank, x4:2 x 2 GB
Memory form factor
- 256MB DDR2:144-pin SO-DIMM
- 4GB 667MHz DDR2 ECC Fully Buffered CL5 DIMM (Kit of 2) Single Rank, x4:240-pin DIMM
Memory bus
- 256MB DDR2:16 bit
- 4GB 667MHz DDR2 ECC Fully Buffered CL5 DIMM (Kit of 2) Single Rank, x4:72 bit
Buffered memory type
- 256MB DDR2:Unregistered (unbuffered)
- 4GB 667MHz DDR2 ECC Fully Buffered CL5 DIMM (Kit of 2) Single Rank, x4:Registered (buffered)
Module configuration
- 256MB DDR2:128M X 16
- 4GB 667MHz DDR2 ECC Fully Buffered CL5 DIMM (Kit of 2) Single Rank, x4:256M X 72
Bus clock rate
- 256MB DDR2:533 MHz
- 4GB 667MHz DDR2 ECC Fully Buffered CL5 DIMM (Kit of 2) Single Rank, x4:667 MHz
Form factor
- 256MB DDR2:144-pin SODIMM
- 4GB 667MHz DDR2 ECC Fully Buffered CL5 DIMM (Kit of 2) Single Rank, x4:240-pin DIMM

Differences highlightedShow differences only

Comparison of 256MB DDR2, 4GB 667MHz DDR2 ECC Fully Buffered CL5 DIMM (Kit of 2) Single Rank, x4
18 specifications	A Kingston Technology 256MB DDR2 View product	B Kingston Technology 4GB 667MHz DDR2 ECC Fully Buffered CL5 DIMM (Kit of 2) Single Rank, x4 View product
Features6 differ
Internal memoryDiffers	0.25 GB	4 GB
Memory layout (modules x size)Differs	1 x 0.25 GB	2 x 2 GB
Internal memory type	DDR2	DDR2
Memory form factorDiffers	144-pin SO-DIMM	240-pin DIMM
Memory busDiffers	16 bit	72 bit
Buffered memory typeDiffers	Unregistered (unbuffered)	Registered (buffered)
Memory voltage	1.8 V	1.8 V
Module configurationDiffers	128M X 16	256M X 72
Memory type	DDR2	DDR2
Lead plating	Gold	Gold
ECCKnown for one	Unknown — not stated by the source	Yes
CAS latencyKnown for one	Unknown — not stated by the source	5
Other features2 differ
CompatibilityKnown for one	CB423-67951 (HP); CB423A (HP)	Unknown — not stated by the source
Bus clock rateDiffers	533 MHz	667 MHz
Error indicationKnown for one	No	Unknown — not stated by the source
Form factorDiffers	144-pin SODIMM	240-pin DIMM
Internal memoryKnown for one	256 MB	Unknown — not stated by the source
Memory layoutKnown for one	1 x 256 MB	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.