Zend certified PHP/Magento developer

My spec page on my HP Pavilion HPE-112y desktop indicates 8GB installed Ram

I thought it had been upgraded to 16 GB. If so, shouldn’t that show on the Device spec page shown below?

Device name mike-desktop
Processor AMD Phenom(tm) II X4 925 Processor 2.80 GHz
Installed RAM 8.00 GB
Device ID DBAC5235-3D97-439B-9772-A2725AF1BA2C
Product ID 00326-10000-00000-AA722
System type 64-bit operating system, x64-based processor
Pen and touch No pen or touch input is available for this display

Is there another way to find out without opening the computer?