It kind of fools the system to believe as if it has got 1GB (two 512MB). But when the system memory exceeds 512MB and tries to write to the otherwise non-functional lower module, the system freezes - because it can't.

I followed the procedure and boot with sys-profiler showing 1GB memory. However it showed type and speed as "unknown" for the lower slot. So, my question is are you able to really use the increased capacity ?

And btw, good that this procedure doesn't last a reboot.

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