I gave a try to upgading NB520 memory to 4GB (I read the manual, I know it says maximun 2GB), just in case.
Sorry to say it didn't boot. It is not a materof windows 32bit or 64bit because BIOS (1.5 and 1.9) got stuck before passing control to windows.
Module used was KINGSTON 1066 CL7:
I read somewhere somebody was using 4GB on a NB.
Did someone tried 4GB?. Is it really working ?
Any BIOS trick for making it work?