I'm really interested to hear how much overclocking headroom the 4GB Clevo 680M has. I almost sold my P150HM because I was going to replace it with a P150EM / 7970M setup until I read about the Enduro issues plaguing the 7970M/150EM. I picked up a 7970M for the HM and I'm happy to report it has no such issues since it lacks Enduro. At 935/1400 it's pulling around 6,300 (GPU score) in 3DM11. Not only does it smoke the 6990M it replaced...it actually runs quieter and about 10c cooler while doing so. It seems like the 680M is going to be a real monster when overclocked. I've heard rumors that it'll run in an HM as well. Hmmmm...