Polyphony Digital's Kazunori Yamauchi has estimated in an interview with Venturebeat that Gran Turismo 5 will use "80 percent" of PS3's processing power.
Asked how much of the system's capability the racer will use compared to Uncharted 2, Yamauchi replied: "It is about the same for the PS3, about 80 percent of the processing power.
"The PS3 hardware has a very high peak performance. The better you manipulate it, the better it performs."
Yesterday, Sony delayed Gran Turismo 5, but only for Japan's release in March.
There is no date yet for the US or Europe: something SCEE will be announcing "in due course."
It was announced earlier this week that the GT Time Trial demo, seen as a taster for the full game, was downloaded over 1 million times since its launch in December last year.