I have tried this soft mod on both of my cards 4870x2 one its a Sapphire the other one its a Powercolor running on high end H2O EK Blocks both , not one single MHz gain as Jcool stated , it ran the same as before the soft mod , max clocks on the best card (powercolor) on stock voltages its 865/1000Mhz stable on 3D06 chilled water. The Sapphire does 855Max , tried both and again not a single mhz gain , yes i did it correctly ,i have been volt moding and using Riva for a very long time. Not worth the hassle if there is no gain , i dont understand how people are seeing improvements when in my case i did not see any , like many guys already found out it does not help oc further 1Mhz on 4870x2cards , that conclusion its base on my extensive testing already done, so dont know whats up with this soft mod .