According to the NYT the new Top500 list (due out in the next few hours) will list the Japanese ‘K’ machine at the #1 spot of the Top500 at 8.2 PF.

The computer, known as “K Computer”, is three times faster than a Chinese rival that previously held the top position, said Jack Dongarra, a professor of electrical engineering and computer science at the University of Tennessee at Knoxville who keeps the official rankings of computer performance.
[…]
K is made up of 672 cabinets filled with system boards. Although considered energy-efficient, it still uses enough electricity to power nearly 10,000 homes at a cost of around $10 million annually, Mr. Dongarra said.

The research lab that houses K plans to increase the computer?s size to 800 cabinets. That will raise its speed, which already exceeds that of its five closest competitors combined, Mr. Dongarra said.

The excellent @HPC_Guru on Twitter said:

K Supercomputer Technical details: 80k+ SPARC64 VIIIfx CPUs, 640K+ cores, 1PB+ RAM, 6-dimensional Mesh/Torus interconnect

But I have a reliable source who claims that this is using GRAPE cards as APUs to reach its performance without causing (another) meltdown in Japan..

The press release for the new Top500 says:

Unlike the Chinese system it displaced from the No. 1 slot and other recent very large system, the K Computer does not use graphics processors or other accelerators.