This post is ancient but I wouldnt reccomend bothering picking up more more ram for your machine. The processor on this is very slow by today's standards (no offense) and doubtful 1g of ram would make much difference. If you're just using it for email and light web surfing, it might not hurt. If you're running any software that's reasobly modern, it might make more sense to look at replacing the compaq.
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