CPU/Memory/MySQL Usage , how accurate?

Hi
I have a customer that host phpbb2. It consume like 2G BW per day and usually has 20 people online and 40 on peak time.
I check CPU/Memory/MySQL Usage on the root WHM, it show this customer use up 40% ram. I guess this is quiet high even he pays half of my server cost.

I did run top to see any high ram usages scripts, could not find very apparant one. any better way to test who is using most rams? and how accurate CPU/Memory/MySQL Usage on the root WHM is?

 

 

 

 

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