Il faut utiliser un OS 64 bit (Windows, Linux, etc.) pour pouvoir utiliser plus de 4gb.
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By definition, a 32-bit processor uses 32 bits to refer to the location of each byte of memory. 2^32 = 4.2 billion, which means a memory address that's 32 bits long can only refer to 4.2 billion unique locations (i.e. 4 GB).
sourceAvec Physical Address Extension (PAE) on peu en utiliser plus sur un OS 32 bit, mais il est limité a 2gb a la fois.