This board can support AMD Athlon™ II Quad-Core Processor 620.Please refer to the CPU support list from the following website.If your system works not very well,please try to update the latest BIOS.ACC(Advanced Clock Calibration) cannot be supported when installed with AMD Athlon II 620 because it is not Black Edition Processor.You can get more information of ACC from the General FAQ below.
CPU support list:
Please refer to Product page - CPU tag
BIOS download URL:
Please refer to Product page - Download tag
General FAQ:
Support/Support_FAQ_Detail/0/74/24