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Date: Sat, 13 Jul 2013 11:52:19 +0200
From: marcus.desto <marcus.desto@...pl>
To: john-dev@...ts.openwall.com
Subject: Re: new dev box wishes

Hi Jeremi

Dnia 13 lipca 2013 9:12 Jeremi Gosney <epixoip@...dshell.nl> napisaƂ(a):

> > Advantages are obvious, besides low noise. Esspecially live time is an issue.
> 
> IIUC this box is colocated in a datacenter. No respectable datacenter
> will allow you to rack up anything water cooled. They will laugh you out
> of the building.

Ok. Have you ever heard about Cray? They used to build systems using liquid cooling for more than 20 years.
Selfmade patch works may leak, of course. But isolated and solid cooper tubed construction may not leak.
That kind of machines have also been placed in datacenters.

A solid not self patched solution for GPGPUs could be planted in a datacenter w/o any problems.

> 
> > I am wondering why vendors still ship high end gpu devices with air fans knowing the gpus produce enormous heat.
> 
> Water cooling was a passing fad. It's expensive, it's a major pain in
> the ass, and when it fails, it fails spectacularly. All of the serious
> password crackers who have flirted with water cooling have gone back to
> air cooling.

I never used liquid cooling, but friends who/did do told me about their experiences, which are positive with one
exception: if your liquid cooling leaks, then it really turns into pain in the butt.

> > I am wondering whether it is really necessary to use high end gpu devices in high end PCIe slots (i.e. AMD 7990 in PCIe v3 16x) when using the device for GPGPU purposes.
> 
> No, it's not necessary. You can run a GPU on a 1x slot if you'd like.
> 

Thanks for reply.

Marcus

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