ASUS recently released their HD4890 cards with a voltage tweaker software. Yes, I know you can just flash your 4890 vbios to the Asus one and make use of the software but not everyone dares to flash the VBios of their new videocard.
Since all 4890 comes with the Voltera VT1165 VRM controller, we can make use of the plug-in as we did with the GT200 and RV770 series.
http://vr-zone.com/articles/increasi....html?doc=6880
Use Rivatuner to increase voltage on ATI Radeon HD 4890
Use Rivatuner to increase voltage on ATI Radeon HD 4890 
