Will a Radeon HD 5570 Video Card work in my computer?

The Radeon HD 5570 has roughly 5x the graphic power of your old GeForce 8400 GS. The 5570 is a low-mid range modern graphic card. For MMOs like you mention, it will peform excellently.

An added benefit is that the low power consumption of the 5570 means you won't have to upgrade your PC's power supply to run it like high end cards. You'd need to run high end games (Metro 2033, Bad Company 2, etc.) in low settings to get decent frame rates out of the 5570, if that's a consideration to you. For those games, a GeForce GTX 460 or Radeon HD 6850 (both around $200) is the new sweet spot for gamers.

These GPUS have nearly 3 year difference I'll go with the ATi. According to this website you can see what big difference they have between them...

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