Need help to upgrade my 10 year old computer

Denis_8

Reputable
Jan 28, 2016
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Soo, i just graduated and i decided that i hate laptops too much so i wanna just "upgrade" my old PC and start using it for web development and well known games like CS:GO/LoL/HotS. The GPU is damaged and i put it in owen and its working for browsing but for video/games it just dies, so it will be number 1 change.

My specs:
GPU: nVidia 9800GT
Motherboard: Biostar GF8100 M2+ SE
CPU: TripleCore AMD Phenom X3 8450, 2100mHZ
RAM: 2x2GB (DDR2-800 DDR2 SDRAM)
Power: Don't know yet, i think its around 400W

So, whats the best CPU/GPU i can get for this pretty old motherboard and eventually play those games?