I want to put a graphics card in my older computer?

Hello. I have an older generic computer (ZT is the brand name) with

windows xp (32 bit)
intel pentium dual cpu e2160 processor
asus p5gc-mx/1333 motherboard (2 pci slots, 1 pci express x16 slot, and 1 pci express x1 slot)

Im a light to moderate gamer, and I am thinking about installing a geforce 8400 gs graphics card (mainly cuz the price). My question is will this graphics card work with this computer, will it run modern games (minecraft, space engineers, gta, ext…) smoothly, or is it not even worth the time and money to do it?

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