One of the fellows at another forum whom I trust, Dr. Goodenhigh, hit 1.6 gig with this bios and an AXIA.
http://www.icrontic.com/faqs/kt7faq/downloads/BIOS/kt7yp01.exe
1333 mHz is available for CPU speed.
http://www.icrontic.com/faqs/kt7faq/downloads/BIOS/kt7yp01.exe
1333 mHz is available for CPU speed.