The XP-M series of processors is going to be recognized as "Unknown Processor Typ" by almost all desktop motherboards, unless you are like me and get a modded BIOS that recognizes it (but that's not necessary.)
If you can't fix this from the BIOS, htere is software (which has been mentioned above) that SHOULD allow you to run it at 2.0GHz. But if your motherboard is too old to allow this kind of optimization in BIOS, you shouldp probably upgrade it like you did with your processor.
If you can't fix this from the BIOS, htere is software (which has been mentioned above) that SHOULD allow you to run it at 2.0GHz. But if your motherboard is too old to allow this kind of optimization in BIOS, you shouldp probably upgrade it like you did with your processor.