bob(nz)

The hardware design of the reference card and classified are definitely different, so assume that this will also apply to the bios

@svl7 - can you confirm that this modded bios has 200% power target? Any way to maintain the card details rather than seeing "generic VGA"?

Yes you will need to add some voltage, but that will definitely cause extra heat. With that motherboard you should have a single page guide that shows safe voltage settings for air, covering CPU, Ram, and Ring Voltage - just use these as a guide (MSI Z87 Platform OC Setting Reference Table - hwbot.org) . I have now tested 10 cpus on air and under LN2 - if you have a CPU that boots into windows at 4800 you definitely have a good cpu (probably very good). The duds will bench 4.3 / 4.4 (luckily I have not had one this bad), most will bench 4.5 / 4.6 no problem (7 of 10 for me), a much smaller percentage will bench at 4.7 (3 out of 10 for me), I didn't see one in 10 that would do 4.8. I would start by setting CPU Volts manually at 1.25V and work up slowly from there. I was using 1.35V for my testing.

Not sure about Boost Edition cards - but for standard 7970 lightnings you could increase volts up to 1.70V using modified MSI Afterburner (obviously not recommended unless you have ln2, know what you are doing, and are okay risking to kill the card )

Try this tool - good instructions included on the techpowerup site...RBE - Radeon BIOS editor