Current total RAM in MacBook Pro

Hi all,
I just upgraded the RAM in my MacBook Pro 13" mid 2010. I replaced the 2x2GB with 2x4GB. When I open my Task manager I still see 4GB under the pie chart.
Is that the total RAM in my Mac? Did I do something wrong with the installation? Shouldn't it be 8GB? I'm very sure I've installed the correct chips.
Thanks in advance.

Thanks all. I checked the Memory menu and it says one slot is empty! Hm.... What am I doing wrong...

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