How to check what kind of processor you have (CPU) and what operating system can I run on it? An X64 has a 64 bit microprocessor, whereas an X86, derived from the old 8086 PC, has a 32 bit microprocessor. A 32 bit machine and/or OS (operating system) is limited to about 3.55GB of memory, and an X64 is limited to about 17,179,869,184 gigabytes, 17,179,869 terabytes, or about 16 exabytes of RAM. Also a 32-bit CPU cannot run an 64-bit OS. So, how to check your CPU: Since you cannot run WIndows7-64x ......