Mobo memory ram is zero after several time mining

HELLO TO EVERYONE
I USE P5QC MOBO AND 2X2GB DDR3 1333 RAM MEMORY . INTEL CORE 2 E8400 AND 2X1080 AND 2XRX580
WHEN I USE ANOTHER MOBO THIS PROBLEM IS NOT HAPPEND . BUT IN ASUS P5QC MOBO TOTAL MEMORY RAM IS DOWN AND NOT SHOWN HOW MUCH MEMORY IN USED.
I TEST WHOLE MOBO AND RAM CPU UNDER THE WINDOWS SYS TEST AND IT IS NOT BROKEN
I CHANGE MEMORY RAM DDR2 AND DDR3
UPDATE MOBO BIOS
SO …

NOT FIX