Your question is really sketchy and provides little detail, but from what I gather, your problem is from one of two reasons (or both):
1) Your CPU runs at 88ºC all the time and you only noticed it now. Being in a hot climate, this isn't very strange. If you really want a lower temperature, install a faster fan.
2) You haven't configured the video card correctly, and as a result of this, your computer isn't communicating with it efficiently, and is dumping data onto your CPU instead. Re-read the instructions on your new card and see whether you went wrong.
3) The extra heat from the card isn't being blown out effectively, and is causing the overall temperature of the system to go up.