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Question Should I upgrade RAM, Graphics Card, or CPU

Apr 15, 2020
I recently got an old self-built PC from my older brother, after he upgraded to a new one. It is very old, but I was thinking about upgrading it to run most games at around 60-100 fps. Not looking for a mega-pc or anything, just something to do some casual gaming on. My specs are :
CPU : Intel Xeon E5450
Graphics Card : AMD Radeon HD 5700 Series (ATI Radeon)
RAM : G Skill DDR3, 4gb(2x2) running at an astoundly low MHZ ( 533.3). I think this is from the age of the RAM.

Which do you tink I should upgrade first on a low budget, to get the biggest difference in gaming? Thank you.