Alternating CPU Speeds. HELP!

[Axiarus]

First off this is what im running:

Amd Athlon 64 3200+
Diablotek Geforce 6600 512mb ddr2
2gigs of Geil Value RAM
Sound Blaster Audigy SE
1 40gb ata HDD (os is on this one), 1 30gb ata, 1 320gb sata
550w PSU

Ok the CPU is supposed to be clocked at 2.0ghz but recently I installed Fable:lost chapters and when i went to run Fable it said my CPU doesnt meet the requirements. (it showed my proccessor as 1.0ghz) I thought this was funny so I checked. Right Clicked on My COmputer and went to properties. IT WAS RIGHT! It said I was running at 1.0ghz. I closed the window, and looked again...2.0ghz. Did this again...1.0ghz. It keeps alternating. But whats funny is all my games are smooth. Even Condemned, which WILL NOT run on a 1.0ghz. Im thinking its just a visual error, since my games run fine. Any help?

 

[fastco]

AMD Athlon processors use PowerNow Technology which is a driver that slows the CPU down when the full processing power is not needed. It does this to save energy and reduce heat.
http://www.amd.com/us-en/Processors/ProductInformation/0,,30_118_10220_10221^964,00.html

 

[Axiarus]

Not a laptop

I dont have a laptop. Says powernow is for laptops...

 

[fastco]

You are right the driver for the desktop is called Cool and Quiet. Same idea...