So I went looking for the new memory module I needed from the Net, but TwinMOS modules like the one I have seemed rare. And yet, the one retailer from whose listings I did find them happened to be the local one (Keski-Suomen tietokonepalvelu) and what’s even better, they had them on sale, so the next day (last monday) I picked up my TwinMOS PC3200 module (pictured inside a Kingston holder) from them.
So I’m going at Double Data Rate now, yay!