SATA2 drive showing up as ATA133

[fatal8]

Topic.
I've used Everest to find out that my SATA2 is showing up at ATA133 (max UDMA speed.) What's wrong on 2 different install attempts?

My system specs are as follows:
AMD X2 4400+ Toledo
2GB DDR400 ram
Maxtor DiamondMax10 300GB SATA2 3.0gb/s 16mb cache (model #6V300F0)
Gigabyte GA-K8N-Pro SLI
Temporary video card

I appreciate any help.