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Message-ID: <20120322041841.GA32320@openwall.com>
Date: Thu, 22 Mar 2012 08:18:41 +0400
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: Re: New patch for OpenCL SHA-512
On Mon, Mar 19, 2012 at 08:34:16AM -0300, Claudio Andr? wrote:
> I have a $ 110,00 dolars GPU [1], 400 MHz (versus 3 Ghz 6 core AMD CPU
> in openMP) , only 128 bits.Not that good.
The Amazon link you posted is for Sapphire Radeon HD 6770 with 850 MHz
core clock. It is a decent one. 400 MHz is only the RAMDAC max speed,
which is irrelevant. The 128-bit memory bus is relatively unimportant.
So your GPU should actually deliver better performance per dollar than
e.g. 7970 does. It is only about 3 times slower, but is 5 times cheaper.
http://en.wikipedia.org/wiki/Comparison_of_AMD_graphics_processing_units#Northern_Islands_.28HD_6xxx.29_series
I think it should be possible to achieve much better SHA-512 crypt speed
on it.
Alexander
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