My Fatal1ty board gave the +1 working multiplier to the processor which was capable of 55 multi.
Maximus IV extreme + my 2600K = 5580max, 55 multi (SS)
Deluxe, Pro + my 2600K = 5560 max, 55 multi (SS)
MSI GD65 + my 2600K = ~~5300MHz max, 52 multi (SS)
Asrock Fatality + my 2600K= 5600MHz, 56 multi (Air cooled, Prolimatech Megahalems)



Please don't look at the SPI run time etc. (I was just testing the 56 multi )