Hardware Pacers has posted a review on the PowerColor ATI Radeon 9800 Pro 256MB! Here's a rip.

After overclocking over the limit (418/371), the video card started to show heavy amounts of artifacts. After the core and memory speed was decreased to 418/371, the artifacts were gone. It is also amazing at how far (418/371 from 378/351) the video card's core can be overclocked."