Excellent job - well done !

I've just swapped 2 GB with 4 GB of RAM - works like a charm using low-cost DDR2 6700 units.

Yes you're right. I even put the question to Tech Support a week ago - still no answer. It's absolutely incredible that no one from FSC is able to answer such a basic question.

The chips are manufactured by Corsair and do correspond with the listed requirements (DDRII-667, PC2-5300), so I would find it hard to believe that alternative brands would work - but you never know !

In any event I'm waiting for the 2nd line support to come back with an answer.

I appreciate your answer, but I guess it wouldn't work since it's a BIOS issue (BIOS won't recognize the memory). I assume the chipset driver won't load until after the BIOS has started.

Has anybody successfully installed 4 GB RAM in 1546/47/54 ? There appears to be contradictionary information in the marketing material - at least for the 1546/47: some technical specifications say a max. of 4GB is possible (as does the user manual), whereas in others the maximum is listed as 2GB. In...