How to full load a 64 bit processor?

Until today I have only run the burnin test software on a 32 bit processor.

On these the standard test seems to easily put the processsor at 95%+ loading.

Today I tried it on a friends new laptop which is 64 bit, 4 core and runing Windows 7.

I didn't have long to try different options but nothing I tried could get the CPU loading even up to the 70% mark.

My question is whether this is a limitation of the software, or my knowledge of how to use it? If the later I would appreciate suggestions.

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