Output from John's program:

Vendor ID: GenuineIntel
Model:               In
Family ID: 15
Model: 2
Stepping: 4
L1 Cache: 0K
L2 Cache: 0K
L1 TLB: 0 4k Pages
L2 TLB: 47104 4k Pages

Output from /proc:

alb@Jupiter:~/Desktop$ more /proc/cpuinfo 
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 15
model           : 2
model name      : Intel(R) Pentium(R) 4 CPU 2.53GHz
stepping        : 4
cpu MHz         : 2532.196
cache size      : 512 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 2
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov 
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm up
bogomips        : 5068.70
clflush size    : 64