Compaq Presario 900 Series (DDR1), Presario 900CA, Presario 900US, Presario 904EA, Presario 904RSH, Presario 905EA, Presario 905US, Presario 907EA, Presario 908EA, Presario 919EA
Your system supports only memory modules with selected memory chips. If you think you have found a store for a lower price elsewhere, then it is possible that the cheaper memory chip will not work.
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