there's a little program called Process XP made by sysinternals who was gobbled up by microsoft last year, this program let you see what's going on in your machine, it's like the windows task manager but is way better.
if you place the cursor over one of the (svchost process) you will see what programs are running in that particular svchost, you can kill processes that are suspicious or see how much ram are they using
this program will not help you if you have a virus, but will inform you of a lot of things that run on your OS, If you want to download it here's the link
http://technet.microsoft.com/en-us/sysinternals/bb896653.aspx
and to answer your Question Yes I think this is unusual use of ram, I use windows XP I assumed you too , don't know if this program works in other OS
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