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Kernel driver was 319.00, OS GNU Debian amd64 jessie. Experts in hardware can judge if the GPUs are working as they should on a shared mem machine.
Correspondigly, the speed burst was ca 13 percent (for molecular dynamics with a system of 500,000 atoms, using a code (namd) where, at each step, the calculation shifts from the GPU (long range) to the CPU (energy), through RAM). Because of this, I expected much more from PCIe 3.0.
All that for consumer stuff. When using the GPU machine at the computer center, with torus interconnections, then the power of the GPUs comes better out. However, to spare money, we try to carry out on our shared mem machines what does not require separate physical nodes. When these are needed, for replica exchange molecular dynamics, the shared mem machines can not be used.