Rumors...
Code:
 470  480  480U  GTX
 448  480  512   Cuda Cores
  56   60   64   TMUs
  40   48   48   ROPs
1280 1536 1536   MiB
 320  384  384   Bit GDDR5
 225  250  270   Watt TDP
So it seems Nvidia did reduce the TDP. It's 250W for the version with 480 cuda cores.