PS3 titles to be played in 3D, requiring a compatible display for use. System software update 3.50 prepared it for 3D films. While the game itself must be programmed to take advantage of the 3D technology, titles may be patched to add in the functionality retroactively. Titles with such patches include Wipeout HD, Pain, and Super Stardust HD. Hardware PlayStation 3 is convex on its left side, with the PlayStation logo upright, when vertical (the top side is convex when horizontal) and has a glossy black finish. PlayStation designer Teiyu Goto stated that the Spider-Man-font-inspired logo "was one of the first elements SCEI president Ken Kutaragi decided on and the logo may have been the motivating force behind the shape of PS3". On March 22, 2007, SCE and Stanford University released the Folding@home software for PlayStation 3. This program allows PS3 owners to lend the computing power of their consoles to help study the process of protein folding for disease research. Use in supercomputing PS3's hardware has also been used to build supercomputers for high-performance computing. Fixstars Solutions sells a version of Yellow Dog Linux for PlayStation 3 (originally sold by Terra Soft Solutions). RapidMind produced a stream programming package for PS3, but were acquired by Intel in 2009. Also, on January 3, 2007, Dr. Frank Mueller, Associate Professor of Computer Science at NCSU, clustered 8 PS3s. Mueller commented that the 256 MB of system RAM is a limitation for this particular application and is considering attempting to retrofit more RAM. Software includes: Fedora Core 5 Linux ppc64, MPICH2, OpenMP v 2.5, GNU Compiler Collection and CellSDK 1.1. As a more cost-effective alternative to conventional supercomputers, the U.S. military has purchased clusters of PS3 units for research purposes. Retail PS3 Slim units cannot be used for supercomputing, because PS3 Slim lacks the ability to boot into a third-party OS. In December 2008, a group of hackers used a cluster of 200 PlayStation 3 computers to crack SSL authentication. In November 2010 the Air Force Research Laboratory (AFRL) created a powerful supercomputer by connecting together 1,760 Sony PS3s which include 168 separate graphical processing units and 84 coordinating servers in a parallel array capable of performing 500 trillion floating-point operations per second (500 TFLOPS). As built the Condor Cluster was the 33rd largest supercomputer in the world and would be used to analyze high definition satellite imagery. Technical specifications PlayStation 3