Hello, a certain Ed Karrell used a couple of pc's equipped with 4 NVIDIA Gpu cards (GTX 690 and GTX 680) to compute the 8,000,000,000,000,000 'th position in binary of pi which is 0, using Bellard's formula and mine. That computer uses 1100 watts. some details are given here : http://www.karrels.org/pi/ best regards, simon plouffe