Upgraded graphics card but lagging in some games

Hey everyone i was hoping if you would be able to help me with an issue I am having with my PC.

My old graphics card was the Nvidia GT 230 1.5gb and it worked fine until it developed a constant blue tint to everything on the screen, I replaced it with the ASUS Nividia GTX 550ti and now I find that games like Fable TLC and Skyrim has on average lower fps then before but games like League of Legends work fine. I installed the new drivers from the disc that came with the graphics card and updated it to the latest driver on the Nividia website.

My specs are:

Motherboard: Foxconn P43AL
Cpu: Intel Quad Core 8300 2.5ghz
Graphics card: Asus Nividia GTX550ti
PSU: Antec earthwatts green 650W
HDD: Seagate Barracuda 1tb 7200rpm

If you need more details I will do my best to oblige, can anyone please help me with my problem?

Thank you for reading.
1 answer Last reply
More about upgraded graphics card lagging games
  1. http://www.tomshardware.com/reviews/gaming-graphics-card-review,3107-7.html

    The 550Ti is a far better card so I'm not sure what the problem is. It's 5 "levels" above the GT 240 (didn't see the 230).
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