I too have not got a real answer on NB GTL's but I cannot run Minus only Auto or Positive.

I am at 475FSB on 1.27v NB & VTT and NB seems best at +40.

I can get 485FSB stable with Ket's Bios but the gain in voltage although not too high is not worth 10MHZ IMO.

I want next 500FSB or I simply will stay at 475FSB.

Today I wasted all my time on once again trying to clock this POS to stable 490+FSB and no matter how much voltage or what tweaks its no go for long if it even boots (ain't the same any 2 boots).

If I were you I would be thankful and clock down to 5000FSB and lower voltages (yours are crazy high).