ik dacht cpuid gebruiken en dan in dit tabelletje opzoeken welke stepping je hebt.
The easiest way to match steppings is to compare the 5-character test specification numbers on the top of Pentium® III processors. The number starts with an "S" and is followed by 4 characters (for example, "SL3CC"). Boxed Pentium III processors have the test specification number also printed on the box label.
voor meer info : http://support.intel.com/support/processors/pentiumiii/intnotes.htm#How to Match Processor Steppings
voor meer info : http://support.intel.com/support/processors/pentiumiii/intnotes.htm#How to Match Processor Steppings