From the pics the G73JH should be more stable and better in controling voltage and heat, but some how mine not really that good. Anyway I think maybe Asus is tryin to figure out a better heat management. I still don't like their vbios can't make the gpu 300 and memory 500 and must use ati clock software to do it. I got used to it but if other users I don't think they can get used to it. The M15x can downclock without problem currently the 260gtx can run gpu 200 and memory 120 temps only around 40-42 the Asus 5870 after I downclock gets around 53-55  Lets give Asus some time hope they can fix their bugs soon.