Kudos, Alan you got to the Wikipedia link ahead of me. Sorry for the redundant posting.
At 5/8/2011, Alan wrote:
>Your PC2-4200 should work fine. As you see here, the basic memory for this machine can be either
>PC2-3200 or PC2-4200:
>http://www.memorystock.com/memory/HewlettPackardPaviliona1100y.html
>
>This is again confirmed in this memory Web site:
>http://www.memoryupgradecompany.com/memory/HPPaviliona1100yMemoryUpgrade.html
>
>A definition of of PC2-xxx is halfway down this Wikipedia page:
>http://en.wikipedia.org/wiki/DDR2_SDRAM
>
>Note that Crucial does 'not' sell the older PC2-3200 orPC2-4200 modules as far as I can see. They
>sell the slightly faster, more common PC2-5300. In theory these should be backwards compatible - and
>they often are. In practice, I've found that PC2-5300 'sometimes' won't work in computers designed
>for PC2-3200 and 4200 (Ours is not to reason why...) - which is why I would recommend going for the
>original memory modules in this case, preferably PC2-4200. Older HP Pavilions in particular can be
>sensitive to memory requirements. There's also not a great deal of difference in price.
>
>Since you already have some PC2-4200, I'd definitely give that a try first. If it works fine, I'd
>suggest buying the maximum if you want to upgrade this computer - i.e. 2x 1 GB of PC2-4200.
>
>
>From: "Old Guys Rule" <pdh_dch2004@yahoo.com>
>
>>I am working on an HP Pavilion a1100y running Windows XP, and I wish to upgrade the RAM:
>> Crucial.com says it takes: DDR2 PC2-5300...
>> The sticks in the machine are: DDR2 PC2-3200u-333...
>> I have some DDR2 PC2-4200u-444... Will these work?
>> What does the PC2-xxxx stand for?
>> Any info on the difference to look for in memory sticks will be appreciated as I have a laptop I'm
>> planning to upgrade also.
[Non-text portions of this message have been removed]
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