MSI H87 and even B85 can OC K cpus no problem

[TheGoat Eater]

http://www.coolaler.com/showthread.php/305670

Looking here it seems that overclocking K CPUs on the MSI H87 and B85 boards is not an issue.

As with non-K SKU Haswells, they can overclock the CPU to the maximum 1-core Turbo Boost frequency.

 

[0___________0]

Asus issued a BIOS update to allow OC'ing on their H87 and B85 boards also.

EDIT: It's a microcode update they're releasing to put a stop to it.

 

[CZroe]

Late to the party. AsRock and ECS were first followed by Asus, Biostar, MSI, and others:
http://forums.anandtech.com/showthread.php?t=2328236