Question about ATI client

For those of you using the ATI client for F@H, what's the CPU usage like?
I know the video client had some trouble at first with high CPU usage, especially under XP ... something to do with the graphics drivers and how they communicated.
The Nvidia client no longer uses an entire CPU core as it used to do, was just wondering about the ATI client.
Please include the driver version and OS at least.

Thanks.

Hahaha, I tried using it, but it caused my computer to completely freeze, and I have to note, that was the first and only time my computer has ever COMPLETELY froze. Though I am sure it was the number of programs plus that, that was the problem.