CUDA-C GPU port of VASP

Several core algorithms of VASP have been ported to run on GPU-accelerated hardware (as of VASP.5.4.1.05Feb16).

Electronic minimisation: the blocked-Davidson and RMM-DIIS algorithms (ALGO= Normal, Fast, and VeryFast).
Hybrid functionals: the action of the Fock-exchange potential on the wave functions (LHFCALC=.TRUE.).

LREAL=.FALSE. is currently unsuported . The GPU port of VASP requires the use of real-space-projection operators (i.e., LREAL= Auto | .TRUE.).
LCALCEPS=.TRUE.
NCORE ≠ 1 (or equivalently: NPAR ≠ #of-MPI-ranks / KPAR) is not supported at the moment. The GPU port of VASP requires NCORE=1 (default).
The use of scaLAPACK for the orthonormalization of the wave functions is not supported by the GPU port of VASP. Actually, this particular operation has been ported to the GPU, just not by means of scaLAPACK. If you have compiled your code with -DscaLAPACK you have to set:

LSCAAWARE = .FALSE.

in your INCAR to avoid the use of scaLAPACK for the orthonormalization of the wave functions.

N.B.: The GPU port of VASP is freely available to VASP5-licensees.

Hardware/Software requirements

The GPU port of VASP only exist because of the excellent work of the following people:

Maxwell Hutchinson (University of Chicago) and Mike Widom (Carnegie Mellon)
Xavier Rozanska and Paul Fleurat-Lessard (ENS-Lyon)
Mohamed Hacene, Ani Anciaux-Sedrakian, Diego Klahr, and Thomas Guignon (IFPEN)
Jeroen Bedorf, Przemyslaw Tredak, Dusan Stosic, Arash Ashari, Paul Springer, Darko Stosic, Christoph Angerer, and Sarah Tariq (NVIDIA)

Accelerating VASP Electronic Structure Calculations Using Graphic Processing Units, M. Hacene et al., J. Comput. Chem. 33, 2581 (2012).
VASP on a GPU: Application to exact-exchange calculations of the stability of elemental boron, M. Hutchinson and W. Widom, Comput. Phys. Comm. 183, 1422 (2012).
Electronic Structure Calculations on Graphics Processing Units: From Quantum Chemistry to Condensed Matter Physics, Ross Walker and Andreas Goetz (Editors), John Wiley & Sons, Inc., UK.
Speeding up plane-wave electronic-structure calculations using graphics-processing units, S. Mainz et al., Comput. Phys. Comm. 182, 1421 (2011).