Yes, from 500mhz stock on core, and 400mhz on memory.. I got 100mhz overclock on the core, and 120mhz on memory . So is this a good overclock for a X1600Pro?.
EDIT: I ran the 3dview for 1minute and so far I got that temp on the picture, and the image is resized to 800x600 from 1024x768
20 - 25% overclock on air is good going, not really pushing the limits per say, but good going none the less on standard cooling.
Your stress test is a tad short, 1 minute won't give you an accurate result, try gaming with something graphics intensive or d/load and run this (rthdribl link) to test it out
EDIT: I presume ATiTool is reporting no artifacts at those clock speeds?