What should I upgrade on my rig to increase gaming performance?

I had my PC for 2 years and I think it's time I did an upgrade.
The question is which part should I upgrade first that will give me the most significant improvement in terms of game performance?
I played the latest Tomb Raider game at low settings, and as expected, the results were disappointing.

Here are my current specs:
Mobo: Asus M4N68T-M LE V2
CPU: AMD Phenom II x4 840 @3.2GHz
Graphics: Sapphire HD5450 1GB DDR3 64bit
RAM: 4GB @1333
HDD: Seagate 500GB 7200rpm

Thanks in advance for your inputs. :D
2 answers Last reply
More about upgrade rig increase gaming performance
  1. That graphics card!
    But before we can make any firm recommendations we'll need to know your monitor resolution and power supply details-Make, model and declared output, both total Wattage and Amps on the 12 Volt line or lines.
  2. if you have a 64-bit OS, increase to 8GB (2x 4GB) of memory

    having a Processor with L3 Cache might help like a Phenom II x4 965

    and also a better video card
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