If you have them both fitted all the ram will run at the lowest speed eg at ddr pc2100 speed. If I were you I would not bother fitting the pc2100 ram, 1 gig of pc3200 will be enough to run everything you want with ease.
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Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.