MB will show proper memory speed by using 773F1P06 BIOS Version or later, Updates can be downloaded from the following link: 

http://www.foxconnchannel.com/support/downloads.aspx?ProductModel=G31MX-K&TypeID=en-us0000003

（How to flash BIOS？ Please refer to the link:

http://www.foxconnchannel.com/support/faq_detail.aspx?ID=en-us0000066 )