I have a few RAM chips with me - however i am confused to which type it belongs to in-case i want to replace or increase RAM size. I am aware that go by DDR 1,2,3 or 4 so can  you please find out what group these RAM chips below to:

1. WT101A PC333  256MB

2. B402-INT M7221897 32MB

3. WT629A PC333 256

4.MW32MB FC100

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Do you know the make and model of the RAM?

If so you can probably find it on the Crucial Memory website:


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Lior KarasentiCommented:
Number 1 and 3 belong to DDR-1 group (PC333)

Number 2 and 4 doesn't looks like RAM models
Gary CaseRetiredCommented:
Each of the module types have the keys (slots) located at slightly different points.
Older SDRAM modules have two slots.   All of the DDR modules have a single slot, but it's located at a different position depending on whether it's DDR, DDR2, or DDR3.

This shows a comparison of an SDRAM module with a DDR module:

... and this shows the slot locations of the 3 different types of DDR modules:

DDR1-2-3 slots
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What systems are number 2 and 4 in?
They look like they are 32MB sticks, which would make them either PC-100, or maybe PC-133, SDRAMS. Check them against gary's first pic to verify.

If that is the case, you are going to have fun replacing or upgrading them.
post pc model, or motherboard models they are used on
Thank you much.    : )
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