Hi edagro,
The temperature for this specific model works just like a laptop processor, the temperature is 100C.
This type of processor was designed to work that way and you will not find overheating issues working at 55C.
See more specifications here:
http://ark.intel.com/products/65470/Intel-Atom-Processor-D2550-1M-Cache-1_86-GHz
Thanks
Allan