Running the client with the icon in the taskbar is very inefficient imho since it will eat video & processing time - which you dont really need unless you wanna watch it processing the work. But that is my preferences personally.
I configure the console client to run at low priority at 30% and the dual cores to run at 60%.
I recently build a AMD 3800 dual core running at 5000 speed with 2GB RAM and bumped the client to run at 60% but in the task mananger it only shows at 30%.
That machine alone is crunching about 10-18 workunits per day!
Would you read my post #51? I have an Intel Pentium II 533mhz machine.