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Date: Sat, 25 Jul 2015 19:08:49 +0200
From: Solar Designer <solar@...nwall.com>
To: discussions@...sword-hashing.net
Subject: Re: [PHC] GPU vs CPU benchmarks for Makwa

On Sat, Jul 25, 2015 at 05:08:31PM +0100, Samuel Neves wrote:
> Of particular note, they have a GTX 780 Ti card [...]

BTW, this card is similar to the GTX TITAN that we have in "super",
which Thomas has access to:

https://en.wikipedia.org/wiki/GeForce_700_series

> The 780 Ti has a lower TDP of 250 W

Same for the GTX TITAN, and after the recent driver upgrade the
nvidia-smi command reports its current power usage (it says around 25 W
at idle now).

> instead of the HD 7990's 375 W

HD 7990's actual peak power usage is commonly somewhere in the 450 W to
500 W range - and yes, this card can't cool itself then, relying on
chassis fans and such.  It is unclear whether Thomas' code gets it this
far or (more likely) not.  Unfortunately, a driver update broke Thomas'
code performance, so he'll probably run new benchmarks and we'll measure
the actual power usage delta (load vs. idle) - can do it via IPMI -
later.  BTW, there's yet another AMD driver update pending - sorry!

Alexander

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