Difference between memory modules

looking to get a 2gb memory module -
whats the dif betwee mod one
"2GB
CT477887 DDR2 PC2-4200 • CL=4 • Unbuffered • NON-ECC • DDR2-533 • 1.8V • 256Meg x 64"
and mod two
"2GB
CT518445 DDR2 PC2-5300 • CL=5 • Unbuffered • NON-ECC • DDR2-667 • 1.8V • 256Meg x 64"
both same price from crucial uk

Call their Customer Support Dept: Freephone - 0800 013 0330
The support dept will be happy to explain the difference &/or if it's right for your computer.

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and also
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Check this link too
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Message was edited by: Amit Kumar

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<a href="https://forums.sdn.sap.com/click.jspa?searchID=1763105&messageID=3206751">https://forums.sdn.sap.com/click.jspa?searchID=1763105&messageID=3206751</a>
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