SebastianCunha, Thank you very much for joining the Intel® Processors communities and for providing those files.
According to the results of the Intel® processor diagnostics tool, the processor actually seems to be working fine:
Processor Name: Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz
Expected CPU Frequency: 3.20
Detected CPU Frequency: 3.19173
Expected Base Clock: 100
Detected Base Clock: 102.959
Additionally, CPU-Z is a third party tool, and the readings or values showing on it might not be that accurate, besides the fact that it also does monitoring, maybe at the moment when you took the picture the PC was running at 800MHz, but that does not mean the processor is not capable of reaching 3.2MHz.
Are you seeing some kind of problems with the PC, like getting freeze or random blue screens?
Any further questions, please let me know.
SebastianCunha, You are welcome. Thank you very much for letting us know those results.
Since you mentioned the BIOS is up to date and so are the drivers the next thing to do in this case will be to swap parts. Do you have the option to test your processor on a different board or test your board with a different processor? This is in order to find out if the problem is related to the board or to the processor, that will be the best way to confirm the source of the problem. Remember that the Intel warranty is for 3 years, and if you do not have the option to try the steps above, we can always replace the processor for you, even though according to the test it is working fine. If you are interested in that option, please get in contact directly with Intel:
Chat support; http://intelsupportchat.force.com/icslivechat/ics_tech_processor_ww_english_Chat, for phone support, depending on your location, you will see the contact information on the links below:
EMEA contact information: http://intel.ly/28QeAF3
APAC contact information: http://intel.ly/1ITfjUF
LAR contact information: http://intel.ly/29c0rW4
North America: Phone Number 1-916-377-7000, Monday - Friday 7:00 AM to 5:00 PM (Pacific Time).
Additionally, as a troubleshoot step, we can try to test the PC with minimal configuration, by using just one memory stick at the time on each slot, just to rule out a possible problem with any of the memory sticks or with the memory slots on the board, and the same thing with the hard drive/SSD, if you have the chance to test the PC with a different hard drive/SSD that will be very helpful to rule out a possible problem with it.
Please let me know the results of trying the steps above.
Any questions, please let me know.