Why would processor change in PC?

I have an AMD Sempron processor 1.5 ghz. I wiped my hard drive and now for some reason the PC reads the processor as an Athlon 900mhz. Why would this happen and how to I fix thisWhy would processor change in PC?Maybe some problem in BIOS settings.

Or maybe your mother board is not working properly. It happened to me once. I had to change mine. Get it checked.Why would processor change in PC?Go into the bios and change the setting for the CPU for more speed. You can use the default settings for maximum speed - it should now read as a 1.5.Why would processor change in PC?go into your bios and make sure the front side bus didn't get reset to the wrong valueWhy would processor change in PC?It's possible that your CMOS battery is dying, and your computer is losing it's settings. Try and reset the processor speed in the BIOS and see if you have any more issues like that. If you do, you may need to replace the battery.