Welcome to Tom's Forum!
My chipset on my LGA 1366 is running @ 35C and 39C on my LGA 2011.
That said, it depends on a few factors:
* Dust inside the case
* Airflow inside the case
* OC of the BCLK or CPU - BIOS changes manually or via some App
You can try blowing and vacuuming everything inside your case and next pull the side panel off and compare temperatures.
55C isn't close to causing any instability but it would be a good idea to clean and check airflow. Ideally, IMO on LGA 1366/2011 it's good to have top-out fan(s) in addition to front-in & rear-out.
/edit - I recommend getting AIDA64 Extreme it's by far the most accurate suite - http://www.aida64.com/downloads
Affordable case options:
$80 COOLER MASTER RC-692A-KKN5 - http://www.newegg.com/Product/Product.aspx?Item=N82E16811119259
$125 Corsair Carbide Series 500R:
Black - http://www.newegg.com/Product/Product.aspx?Item=N82E16811139009
White - http://www.newegg.com/Product/Product.aspx?Item=N82E16811139010