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Date: Wed, 26 Jun 2013 16:16:49 +0400
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: Re: new dev box wishes (was: Contest)

On Wed, Jun 26, 2013 at 01:24:56PM +0200, magnum wrote:
> On 26 Jun, 2013, at 13:08 , Solar Designer <solar@...nwall.com> wrote:
> > OK, although card vendor's overclocking is a bit different
> 
> Maybe in terms of warranty and reliability

Yes, and also in terms of those clocks being somewhat standard - not for
the upstream vendor's reference design, but for the specific card model.
We just have to refer to the card as "Zotac GeForce GTX TITAN AMP!
Edition" rather than simply "GTX TITAN".

> but the extra MHz does not come cheap in terms of power usage and heat.

Apparently, in this case it does - only 9W extra under load (and none
when idle):

http://www.xbitlabs.com/articles/graphics/display/zotac-geforce-gtx-titan-amp-edition-6gb-sli_4.html#sect1

> I just don't see any benefit for development.

I agree about development, but I think this machine, unlike bull, may be
used by others to do some occasional computation.

> > Besides, with all recent cards having boost speeds, the point in sticking
> > with stock clocks is moot.  e.g. we're "lucky" to have the original 7970
> > in bull, but modern 7970's all have boost, so clock rates vary.
> 
> If it's settable and doesn't come with a hefty price tag, by all means pick one that supports OC - you could leave it at stock (or just lower than max) clocks when we're not participating in a contest.

Like I mentioned, I am not aware of a way to adjust the clocks on NVIDIA
cards from Linux.  (This is easy with AMD cards.)

Alexander

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