well ATItool saves teh clock settings. If you select the startup options in my guide it'll start with your computer, apply your changes, then quit (and the changes will still be active).
Personally I run two zalman vf700s, so they run at 100% constantly. I get like 48C idle, and like 70 load. What card do you have? if you're getting similar temps at stock settings it's probably safe at that (and if it's not your manufacturer will be replacing it).
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