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I recently bit the bullet and built a new machine: double Xeon
configuration
with a GeForce FX5900 by Gainward. The CPUs run in the lower 40s celcius,
which is excellent, but the GPU on the graphics card runs a bit hotter.

After the system has been up for a while X-windows or win-XP, the GPU
core temp registers in the upper 50s. the driver software shows a default
core slowdown temp of 140 celcius and this seems WAY HIGH!

What would be a reasonable operating temperature for the GPU and at what
temp should I flag a temperature alert?

The Xeon CPUS automatically throttle back at 71 celcius. This seems like
a much more reasonable value.

Did some doofus who wrote the driver software put a farenheit value in
as a default that should be listed in celcius?

Any thoughts?

I have a 5900 'vanilla' and idle temps are GPU 46-47c, ambient 35-36c
After gaming with i.e. Farcry the GPU reaches 65c or so.
You did'nt mention the ambient temp as stated in the Nvidia control panel -
so could it be poor case cooling? If you are using a 5900 XT or SE I think
they use smaller cooling solutions (my 5900 is a double-height card, using
up the space of the PCI slot below the AGP)