Quote Originally Posted by Spam Butterfly
One of the other neat things is Richard has put some extra tweaking for matching frame speed with sync frequency. Very useful. Catalyst also times the sync frequency itself rather than relying on feedback from the monitor back to the OS, which is usually incorrect..

Hugh
this was the main problem that appeared between 10.3.3 and 10.3.9 - and unfortunately the apple api tp measure these frequencies on dual graphics cards was broken until 10.4.3 - so the problem was unmeasurable.

for example the graphics card says its running at 60hz - it isnt exact - sometimes its 59.9 sometimes its 60.2 seems to depend on the screen resolution.
this caused a low level performance problem running at 60hz but less of an issue in europe at 75hz.

apple made an internal architecture change which affected me.