I am currently running a 32-bit OS, but I'm not really sure if I have to. According to some articles on the Web, there are no flags in my output that indicate that my CPU is a 64-bit. But according to articles describing the `Athlon II X2 250`, such as [this one](http://www.cpu-world.com/CPUs/K10/AMD-Athlon%20II%20X2%20250%20-%20ADX250OCK23GM%20%28ADX250OCGMBOX%29.html), it should be 64-bit processor. I've never been much of a hardware person, so I don't know if this article necessarily means that mine is a 64-bit, or mine is just a subset of some family of processors, some of which are 64-bit. 

I am slightly worried because there is nothing in the hardware information that very specifically states Data bus size: 32 or 64. How do I know for sure? 

This is the output from my `/proc/cpuinfo` 

```
processor   : 0
vendor_id   : AuthenticAMD
cpu family  : 16
model       : 6
model name  : AMD Athlon(tm) II X2 250 Processor
stepping    : 3
microcode   : 0x10000b6
cpu MHz     : 1800.000
cache size  : 1024 KB
physical id : 0
siblings    : 2
core id     : 0
cpu cores   : 2
apicid      : 0
initial apicid  : 0
fdiv_bug    : no
f00f_bug    : no
coma_bug    : no
fpu     : yes
fpu_exception   : yes
cpuid level : 5
wp      : yes
flags       : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc nonstop_tsc extd_apicid pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt hw_pstate npt lbrv svm_lock nrip_save vmmcall
bogomips    : 5984.90
clflush size    : 64
cache_alignment : 64
address sizes   : 48 bits physical, 48 bits virtual
power management: ts ttp tm stc 100mhzsteps hwpstate

processor   : 1
vendor_id   : AuthenticAMD
cpu family  : 16
model       : 6
model name  : AMD Athlon(tm) II X2 250 Processor
stepping    : 3
microcode   : 0x10000b6
cpu MHz     : 2300.000
cache size  : 1024 KB
physical id : 0
siblings    : 2
core id     : 1
cpu cores   : 2
apicid      : 1
initial apicid  : 1
fdiv_bug    : no
f00f_bug    : no
coma_bug    : no
fpu     : yes
fpu_exception   : yes
cpuid level : 5
wp      : yes
flags       : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc nonstop_tsc extd_apicid pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt hw_pstate npt lbrv svm_lock nrip_save vmmcall
bogomips    : 5984.90
clflush size    : 64
cache_alignment : 64
address sizes   : 48 bits physical, 48 bits virtual
power management: ts ttp tm stc 100mhzsteps hwpstate

```