AFAIK it's a bug that affects only some people. Why don't you try another miner?
List: http://forum.bitcoin.org/index.php?topic=16125.0
Topic: phoenix.exe @ 25% CPU usage (Read 1837 times)
I use the Phoenix Rising 1.3 GUI, and I'm mining two cards. Both phoenix.exe processes in Task Manager are showing 25% CPU usage. I don't have the greatest cooling system on my Q6600 so it runs hot under 50% constant load. I don't think that GPU mining would use much CPU at all. Is it possible that jedi95 is getting some free mining out of everyone using his client?
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