Infiniband and commodity hardware

From: Thomas Albers (talbers_at_binghamton.edu)
Date: Sat Sep 17 2011 - 14:59:20 CDT

Hello!

Has anyone on this list perhaps experience with Infiniband and commodity
PC motherboards?

Recently SDR Infiniband cards have appeared on the market at very good
prices. The Mellanox manual states that a MHEA28-XTC card requires a
PCI-E x8 slot, however the average motherboard with two PCI-E x16 slots
tends to have only one slot with full x16 bandwith, the other one is
usually x4.

Does the Infiniband card fall back to x4 bandwith when plugged into the
x4 slot as your usual graphics card does?

If it doesn't do that, and the CUDA graphics card has to go into the x4
slot, will bus bandwith be a limiting issue for performance?

Regards,
Thomas

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