is the asus engtx 550 graphics card compatible with my gigabyte ga-m68mt-s2 motherboard and if so would the graphics card be worth the money since i do mostly gaming
Agree with Jackson, if you can afford it, you should look at the 560 Ti or an AMD card over the 550 if your main purpose is gaming. Here is a link to Tom's review of the 550.
Personally I have a 550 Ti myself, (upgrading soon) it's fairly decent for gaming, but once you start playing demanding games such as AvP or Crysis etc, you'll start running into problems.