how to tell if ram is low density and unbufferd

how to tell if ram is low density and unbufferd
Here are the numbers on the only label
pc100-222-620
bar code 1362768
mg4512
tcandsAsked:
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Gary CaseConnect With a Mentor RetiredCommented:
Those modules are low-density, unbuffered modules.   Here's the datasheet:
http://www.datasheetcatalog.org/datasheet/siemens/PC66-222-920.pdf
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rabioCommented:
Is it 1 gig? if it is:
    * All low density 1GB modules are made with 16 chips (8 chips on each side) using 64Mx8 device.
    * All high density 1GB modules are made with 16 chips (8 chips on each side) using 128Mx4 device.
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tcandsAuthor Commented:
it is 512MB PC100 RAM
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tcandsAuthor Commented:
how do I tell the differeence from 64MX8 and the 128MX4
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tcandsAuthor Commented:
Fast response and data sheet provided
Thanks
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