why i need to upgrade my gpu if it can run all of the modern games ????

sosolola

Reputable
Nov 1, 2014
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my pc
cpu i5 3570k
motherboard gigabyte ga b75m d3h
16 giga ram
windows 7 64 bit

gpu amd radeon hd 6770 1gb

my pc can run all of the modern games without any proplem
I played
dead rising 3 -battlefield 4-the evil within -metro last night redux - Alien Isolation-ryse son of rome etc etc
without any proplem
on my 40 inch tv 1080p

so why I need to upgrade my gpu
what I will get ?