roobarb:

 

Windows 7 will use the complete 8GB RAM, however each process is normally limited to 2GB.

 

This only ever applied to Intel IA-32 processors with memory controllers that used bank switching.  Basically everything up until P4.

Since W10 the per process memory limit has been at least 8TB.

aucklander:

 

my original question still stands: why does System Properties show system type x86 (not able to run 64-bit OS) when Microsoft data sheet says that processor is able to do that?

 

@aucklander

x86 is the common name for Intel's 8086 CPU architecture.    Nowdays x86 implies 32bit CPU (whereas x64 implies 64bit CPU) so System Properties is a little misleading.

Pretty much all Intel mobile/desktop CPU's released since ~2007 are 64bit (except Atom). Certainly the i5.