[Prime] Prime95 and hyperthreading

[Jud McCranie]

Today I put Prime95 on a P4 with hyperthreading.  When I do the 
ctrl-alt-del to see the task manager, Prime95 is only getting 49-50% of the 
CPU, compared to 95% or more on other machines.  I assume this is because 
of hyperthreading.

I did benchmarks on this machine and compared them to an older P4.  They 
are only 14% faster even though the clock speed is 25% faster.  The 
benchmark is 12% lower than the benchmark on the benchmark page for the 
same speed of P4.

Should you run two instances on a hyperthreading CPU?  Are there other 
issues with hyperthreading and prime95?

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