hmm there is some weird stuff here heh...
the OS (32bit) can't fill above 3.68 GB RAM (yes i'm testing its limit now)
at least task manager shows as such, then either popup warning gets out or programs crash
taskman also reports 75% memory usage, but "commit charge" reports "5075 MB" / 5117 MB used
while resource monitor says that used RAM is 3882, and above it can't go
so I guess at the end x86 OS even patched can't use these 5 GB :(