"95, 98 and XP get the speed hopelessly wrong (even without overclocking) and, if you have anything but an Intel processor, it just takes a wild stab at the type." 

My XP sysinfo cpu info agrees with two different system info utilities, Speccy and PC Wizard on cpu ID and actual speed. The only difference from AMD CPUInfo is the processor family and I think from what I can see on Google that Windows (and the others) actually got it right.  SysInfo doesn't show the processor name but I'll give 'em a halfway pass on that since you can find it on System Properties when you right click on MyComputer. Course, my s**t is old. Them newfangled Dool Corps thingies may throw poor old Winders for a loop :-)

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken