Turn hyperthreading off for most CAD applications. It takes a single core CPU and gives you 2 halves. Instead of peaking out 1 cpu, you will only peak out 1/2 of your physical cpu.
Also, there is overhead with multicore processors. a dual core processor will NOT give the performance of 2 single core cpus in a computer. Same with a quad core versus 4 single cores. With shared internal processes on the chip, a quad core givs you the performance of about 3 single cores.
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