RAM 4GB TO 8GB

My computer TOSHIBA SATELITE L755
Original RAM 4GB 64 BIT PROCESSOR INTELl
TONIGHT REPLACED WITH 2 4GB upgrades the computer works but when you go to settings it still shows INTEL 4GB RAM no mention of upgrade the computer does not appear to have changed in speed
Please advise what I need to do to rectify
David
 
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