CPU loading has high change rate when run CPU test

[David (PassMark)]

We never really made any attempt to exactly match the CPU load from each sub-test in the CPU suite. It would change slightly for each CPU model in any case.

[mafiajerry]

Hi,

I run Burn-in Test V8.1 in my systems, as follows
CPU:
Intel 6th Gen Skylake CPU
C7: i7-6822EQ, Quad-core, up to 2.8GHz (HD-530)
C5: i5-6442EQ, Quad-core, up to 2.7GHz (HD-530)
C1: Celeron G3902E, Dual-core, up to 1.6GHz (HD-510)
PCH:
Intel® QM170

I use default CPU test item with 80% duty cycle, the CPU loading runs from 40% to 90%.
But when I only select "General purpose instructions", CPU loading keep to run on 90%





Why the CPU loading has big difference between two tests?
Does anyone have the same experience?
Thanks.