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.
Yes, this is normal with a HT P4.
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.
Go to the Prime95 Advanced/Affinity menu and set Prime95 to run on a "single" CPU (e.g. CPU 0) -- you will see a fairly significant increase in throughput and will probably be able to match the benchmark page results.
-- Brian Jongekryg
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