Quote Originally Posted by KTE View Post
OK. Just dual booted Ubuntu 64b at 2.639GHz. One way to check what the problem is to install it with a speed. If it's the OS itself, installation will pass easily but not the OS loading/functioning.
Flew through the install without problems. Booted too. But my GFX is not supported, working in 8x6 is horror and every other second, a certain application kept freezing up with low power load. Very buggy OS even at stock with TLB Fix.

I had to restart in the middle around 4 times and that kept destroying the HD/OS with errors. Next instance I had it sorted, 2.639GHz would always hang at loading Ubuntu at 135W AC load. That's 100% 32b stable speeds. Voltage upto 1.45V didn't make a difference whereas in 32b Linux/Windows, I ran it at 1.248V. But 2.626GHz would work error-free and it ran for nearly 9 hours now without fail. 64b LiveCD ran perfect and Memtest latest version passed 1hr before trying.

Gutsy 64b had higher idle and load power consumption.
You need the fglrx drivers for the hd2600xt, last time i tried ubuntu that packages where available. Also compiz fusion worked flawless and without the need to edit xorg.conf the first time.
Have you inspected the logfiles if an app freezes? (dmesg or /var/log/kern.log)
It's stable at 2.5GHz I assume.
As for power consumption there is no k10 cnq driver for linux yet.