PCIexpress 3.0 for MD with NAMD on GPUs

From: Francesco Pietra (chiendarret_at_gmail.com)
Date: Mon Nov 11 2013 - 03:51:02 CST

Which version of the nvidia driver is needed to activate PCIexpress 3.0
between the GPUs and RAM for MD with NAMD2.9 or NAMD2.10? As far as I can
remember, nvidia deactivated PCIe 3.0 for linux from version 295.xx until
at least 310.xx. Is that correct?

With a PCIe 3.0 certified consumer motherboard, on replacing sandy bridge
i7-3930 with ivy bridge i7-4930, with two GTX-680 cards, under nvidia
304.88, such as with Debian stable wheezy, PCIe was left to 2.0, instead of
the expected 3.0. Even with a heavy job, half a million atoms, while
replacing 1066MHz with 1866MHz RAM, speed increase was of only a few

I wonder whether nvidia 319.xx, available with Debian testing (jessie)
could open the bottleneck between the GPUs and RAM.

Thanks a lot for advice

francesco pietra

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