Can you post a link to the motherboards webpage? A search of MS 7713 come up with nothing. That web page will list all compatible CPUs, normally in the download section under manuals.
MEDIONPC MS-7713 is a motherboard manufactured by MSI for Medion. Only ones I see are Socket AM3 but you may have another revision. Your best bet is to go to Medion's website and search for the motherboard information by inputting your serial number.
Thank you all very much for your help.
I by on Ebay a second hand AMD Athlon II x4 640 for my mainboard for one hour.
So we can close this thread.
I hope the new one is ok and after I can start my system, I will update all information from my Mainboard MS 7713 in this thread.
Sorry for my bad English