> I cannot find pair of RAMs which have no errors
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.
And as I tried many pairs of RAM and none of them works, it is nearly the same as 2B2 is not 2GB capable
Btw. I found only one 2x RAM combination which worked for me - 512+256 MB.
AmigaOS: Micro A1-C, AmigaOne XE, Pegasos II, Sam440ep, Sam440ep-flex, AmigaOneX1000
MorphOS: Efika 5200b, Pegasos I, Pegasos II, Powerbook G4, Mac Mini, iMac G5, Powermac G5 Quad