over the years, I accumulated few thinkpads, so here are some relative measurements between them
T22
T42
t42:~# cat /proc/cpuinfo 
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 13
model name      : Intel(R) Pentium(R) M processor 1.60GHz
stepping        : 6
microcode       : 0x18
cpu MHz         : 600.000
cache size      : 2048 KB
fdiv_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 mce cx8 sep mtrr pge mca cmov clflush dts acpi mmx fxsr sse sse2 ss tm pbe bts est tm2
bogomips        : 1196.15
clflush size    : 64
cache_alignment : 64
address sizes   : 32 bits physical, 32 bits virtual
power management:

t42:~# hdparm -tT /dev/sda

/dev/sda:
 Timing cached reads:   1232 MB in  2.00 seconds = 616.23 MB/sec
 Timing buffered disk reads: 100 MB in  3.02 seconds =  33.09 MB/sec