My second vbios mod was on a Radeon 7970M GPU on a Clevo p170hm. The 6990M on it died a horrible death like everyone elses' (I never did get to try the oven bake solder reflow trick). Got a 7970M but the heatsink wouldn't fit in a P170HM, so I ended up using the existing heatsink for the 6990M. But I was worried that the 6990M heatsink wasn't designed to take the extra TDP heat from the 7970m so I modded the 7970 vbios and underclocked/undervolted the max profile so that its max profile clocks/volts would be the same of the 6990M. The 7970M served me well lasted though all the games I put it through until I sold the laptop.