That is an Intel anomaly. There is only one floating point unit with 2 virtual CPUs, so it only shows 50%. Your computer is running as hard as it can. Turning off hyperthreading in the BIOS will show 100% usage. There may or may not be much difference. There are pages and pages of references to other threads on this if you search in the little box above for "hyperthreading".

Hyperthreading has the greatest gain when a floating point application like this one is run concurrently with an integer application.

I'd searched before posting, but didn't see a definitive answer.

I'll look ito BOINC. Thanks for the tip.

mike

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The whole problem is the way that XP reports CPU utilization in XP. If the machine is running full speed on a WU, and HT is on, XP reports that you are only 50% busy. If the machine is running full speed on a WU, and HT is off, XP reports that you are 100% busy. Truth is that there is a highly negligible difference.

Dual Core processors are a whole different kettle of fish. The UD agent will run on only one core and two UD agents cannot run on the same machine (although some say they have gotten it working using some exotic techniques, it is not recommended...at all). Now BOINC on the other hand, is built to take advantage of Multi-core or Multi-processor computers.

I have a dual core computer that I runs one UD agent and one BOINC agent. It seems to work quite well.