It has been a week since the launch of the AMD Radeon HD 6870, and none of the usual software tools seem to be able to deliver overclockers the mystic strength of complete voltage control. Do we still wait? We don’t think so.

The Overclocker – he who wields absolute control over each and every operating parameter of his PC – has yet to find the perfect software tool that can trick it all out. 

Not on his latest purchase, not on that shiny AMD Radeon HD 6870.
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Do we still wait for that one software tool which does it all? We all ought to, because the other option naturally voids the warranty of what is likely your latest purchase. However, here at, our patience has been replaced by frustration, and ultimately an odd itch. 
As with other AMD graphics accelerators of late, there are three critical voltages that are likely to influence the clock speeds on each and every AMD Radeon HD 6870: VDDC, VDDCI, and MVDD.
We’re Gotta Mod ’em All.

Altering the VDDC voltage on AMD graphics accelerators has a direct effect on the (Graphics Processing Unit) GPU core clock. Raising it will increase the thermal output of the AMD Radeon HD 6870 – something that is not always welcome. We recommend that you secure a good GPU thermal solution prior to performing this modification and increasing VDDC.
The default VDDC sits at approximately 1210 mV. The 200 ohm potentiometer should be a multi-turn type, set at its maximal resistance prior to installation. For better granularity at higher VDDC, use a 100 ohm potentiometer. For less initial voltage gain, try a 500 ohm one.
We do not recommend that you “ground” the potentiometer at any point other than the one illustrated above – doing so would defeat the differential sensing capability of the CHIL8214 Voltage Regulation Module (VRM) controller – and worsen the common mode noise rejection capability of the voltage-sensing amplifier.
There exists no known over-current or over-voltage trip points below 1800 mV.

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