Woo Hoo! Another happy camper over here! I'm using the LE-GT at 1.4V from thugsrooks.
The boot disk linked here wouldn't boot, so I used an old dos disk i had and swapped once it was booted up. I think Vallybally is right about needing to format it as a system disk. I didn't uninstall the drivers/reinstall the drivers until after flashing since they shouldn't affect anything that's going on in dos, but rivatuner could do funny things like keeping the oldsettings when booted back up.
Vally, there are two places to get to the OC options, one on the right of "256-bit NV40....Customize" and one on the right of "ForceWare detected...Customize". The OC option is only accesable in the Forceware one.
I used the detect Optimal Frequencies once I got the OC options in the driver and now have a nice cool running 350/1240 2D and 426/1240 3D card. The detection is kinda crazy as the screen flickers and the fan ramps up and down for a couple minutes until it finishes up.
I'm ideling at 54-55 GPU, 39 ambiant(as per GPU), 35CPU 32 abiant(as per mobo). I'll do a load test and update.
update:
3DMark03 had stuttering issues at 423/1224 so I tuned it down to 400/1200 and ran it again with no problems. It's late, so I'll do more tuning tomorrow sometime. As for numbers:
3Dmark03
325/1100 (stock bios): 10018
350/1100 (LE-GT 1.4V): 10736
400/1200 (LE-GT 1.4V): 11924
load temps: 77GPU, 52 ambient (per gpu), 50CPU, 35 ambiant (per mobo)