>> 2× 1 GiB can only work error-free on revision 2B5 boards.

> yes, 2B5 is best for 2GB. But theoretically from rev.2B2 is Pegasos2
> 2GB capable. In past I spoke about this with Thomas Knäbel from bplan
> and he confirmed that 2B2 motherboard is 2G capable, but there was a
> very limited amount modules which works. Somewhere (forgot where)
> I also read, that from rev. 2B3 is much better chance to 2GB work.

I've yet to read about any pre-2B5 board that works reliably (i.e. also tested successfully with Linux, because that works harder on the memory than MorphOS) with 2× 1 GiB, and even with 2B5 it's hit or miss. Theoretically, all boards from 2B1 on should work with 2× 1 GiB, because that's what the official mainboard specs claim ;-)