The HD6970 series from AMD is a pretty good performer. It's rendered the HD6870 obsolete and, as we showed the other day, in Crossfire it rocks so hard it's unbelievable. Today we're back looking at another single reference card, although this time from ASUS. We all know what that means, Voltage Tweak BIOS. We're very hopeful that this will enable us to finally see what the top end of these cards is in terms of clock speed and hope much performance is available. So without further ado, especially as you should all be familiar with these by now, let's crack on.