[Beowulf] NVIDIA GPUs, CUDA, MD5, and "hobbyists"

Chris Samuel csamuel at vpac.org
Thu Jun 19 19:32:11 EDT 2008

----- "Kilian CAVALOTTI" <kilian at stanford.edu> wrote:

> AFAIK, the multi GPU Tesla boxes contain up to 4 Tesla processors, but
> are hooked to the controlling server with only 1 PCIe link, right?
> Does this spell like "bottleneck" to anyone?

The nVidia website says:


# 6 GB of system memory (1.5 GB dedicated memory per GPU)
# Connects to host via cabling to a low power PCI
# Express x8 or x16 adapter card

So my guess is that you'd be using local RAM not the
host systems RAM whilst computing.

I took a photo of an open Tesla box at SC'07:


(click on "All sizes" for a larger version), my guess
is that the DIMMS are hidden under the shrouds.

There's a lot of fans there..

Christopher Samuel - (03) 9925 4751 - Systems Manager
 The Victorian Partnership for Advanced Computing
 P.O. Box 201, Carlton South, VIC 3053, Australia
VPAC is a not-for-profit Registered Research Agency
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