CPU over heating after upgrading GPU

Hey guys, so until 2 days ago I had an MSI R7850 Twin Frozr in my rig which worked perfectly fine with no problems. Since then I have upgraded to the XNX R7970. Now whenever i'm gaming (or doing anything demanding) my CPU's heat jumps to 90+ degrees celsius and i am barely seeing a performance boost in any of my games. any help anyone? :(
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More about heating upgrading
  1. full system specs please
  2. intel i5-3570K
    16GB DDR3 RAM
    XNX Radeon R7970 3GB GDDR5
    1TB 7200RPM HDD
    120GB intel SSD
    600W Thermaltake PSU
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