Done all that, apart from installing AMD's optimizer, as plenty of people have had issues with it. I seemed to have solved the freezing here by turning off VSync, but we'll see.
( BTW, not sure what effect this would have in LFS when using VSync, but I have the DirectX ' render frames ahead ' value set to 1 instead of the default of 3 )
When racing / testing online or offline LFS will lock up after 5-30min, sound loops the last 1-2 secs over and over, then after 15-30 secs it can unfreeze itself and I can carry on racing, although my car is not in the same position it was when the gfx / sound froze - it's further along the track stopped / pranged against a wall as though LFS was running as normal in the background but the gfx / sound weren't updating themselves. On a few occasions the sound has carried on playing as normal ( I can hear other cars passing / braking around me ) but I can't bring up Windows task manager, the screen refuses to update itself and I need to reset the pc.
This is with Vsync turned on ( tried with it off, same problems ) and fps limited to 85 ( my monitors refresh rate@1600x1200 )
Pc spec :
A64 X2 4200
Gainward 7900GS ( no AA or AF ) Forceware 91.47
2x1GB Pc3200
X-Fi XtremeMusic
Logitech DFP
WinXP
Tested this with the above spec at stock settings, and overclocked. Pc was definately not overheating when LFS locked up, and I'm running nothing like MSN / Messenger in the background, just the usual WinXP services and Blueyonders' PCGuard software ( firewall )