'040s stopped at 40MHz, I believe, and that'll get you about 44 MIPS.
'060 at 50MHz will give you something like 80 MIPS.
The '060 will be plenty faster, and run a whole heck of a lot cooler.
you are wrong...from where you got that numbers?
the 060/50 is not twice faster than the 040/40....it's only about 25% faster
in fact both cpu are idem core and a 040/50 overclocked runs at idem speed on integer like a 060/50
sysinfo reports
040/40 31 mips
040/50 overcloclked 38 mips
060/50 38 mips
