i5 8400 performance problem

Feb 2, 2019
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i bought i5 8400 recently.
i am using it with b360 mobo and 8gb ram.
my problem is when i benchmarking the pro it ment to score around 11500 in passmark benchmark.
but it only manage to gain around 10000.
is it normal or if not i need to know the solution.
or i need to know where is the prob.