George,
In this instance, I think the relevant info is contained in the Graphics/Displays section of the System Profiler window [About this Mac>More Info>Graphics/Displays]. Here's mine:
[attachment=1393:Profiler...displays.png]
I also found a way to save the entire Profile as a file, under Save or Save As... in the System Profiler > File menu [you could use this to send very very detailed info to someone who asks].
Kb