55 degres, what you want it ot be? -55C?
I have been using AMD, and it wsa 54-58 normally in idle standing, and it is cosidered absolute normal for AMD Processor.
if still you are worried, let me give u very good suggestion, (will bring down at least 5-6C temp)
clean ur CPU and Heatsink with Isopropyl alcohol, then apply Arctic Silver 5, (assuming u have fans at the back).
still not satisfied, get yourself Zalman 7000-CU series fan (any of the three similar models)
making sure: you have enough space aroung socket that isnt blocked by the capacitors, also, this fan weighs nearly quarter to a Kilo.
Intel Core2Quad 2.66Ghz 12MB L2-Cache
4096MB DDR Kingston Hyper-X
XFX 9600GT AlphaDog
Seagate 2 X 320GB SATA2
LG L246WH Flatron 24"