Recently acquired some "mystery RAM". It's a 512MB stick of DDR rated to PC4000 with 3-5-5-10 timings.
The heatspreader wasn't giving up any secrets, since the labels had been ripped off long ago (there was still a glue residue of where the labels had been), and to my dismay CPU-Z didn't give up much either other than the module's size along with the timings and speed rating (no manufacturer or model though).
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So, it was time to go about removing a heat-spreader or two and get at those memory chips.
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My only regret was accidentally cutting open my finger while removing one of the clips. And no, it wasn't on the knife, I cut myself on the heat-spreader itself. I still can't wrap my head around how I did it, the heat-spreader itself is dull on the edge. Given the choice between cutting myself on the knife or the heat-spreader though, I'd choose the heat-spreader, since my knife is much sharper after all.
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Well, here we have it, chips are Hynix BT-D43's.