I also had the OP's problem -- the game crashing in the Kazakhstan level unless next gen was turned off. But after I deleted the registry key "HKEY_CURRENT_USER\Software\Crystal Dynamics\Tomb Raider: Legend" I was able to continue the game with next gen on. After a while, it would crash again and I repeated the process. I have a 8800GTX and, like the OP, an Asus mobo with nForce4 chipset (Asus P5N32 SLI SE Deluxe). But I didn't have to underclock or change the PEG and all that stuff. Wow, you look like Groucho Marx...
Last edited by cwy; 02-19-2007 at 08:37 PM.