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Date: Sun, 9 Dec 2012 01:01:31 +0200
From: Milen Rangelov <>
Subject: Re: GPU based cracking, AMD or NVIDIA

I would say that Kepler-based GPUs are faster than their Fermi counterparts
(more on "fast" algos and less on "slow" ones).

There is a reason for that. Generally speaking, the SM/clock speeds are
better for 6xx. However, Nvidia crippled the architecture in a way. They
just packed 4x more SPs in a CU, but the register file is just 2x larger.
This in turn means that on 6xx, running algos that require more GPRs will
suffer from occupancy problems much more as compared to 5xxx.

To simplify that: if you are to run "fast" algos like md5 or sha1, 6xx is
much better (both in MH/s per GPU and MH/watt per GPU). For slower algos it
might even turn out that 5xx is faster on some occasions.

You can have a look at my estimations table (based on hardware specs and
algorithm specifics, not real benchmarks):

On Sun, Dec 9, 2012 at 12:40 AM, magnum <> wrote:

> On 8 Dec, 2012, at 19:57 , Solar Designer <> wrote:
> > On Fri, Dec 07, 2012 at 07:45:21PM +0100, magnum wrote:
> >> Fact is even that current nvidia cards are often more or less slower
> than the previous generation. At first I thought it was due to compilers
> and optimizers not being mature but this fact stands. At best, a GTX680 is
> insignificantly faster than GTX580.
> >
> > Are you aware of any password cracking related task where GTX 680 is any
> > faster than GTX 580?  I've only seen (non-JtR) benchmarks showing it
> > being slower - often several times slower, even.  (I don't have one to
> > test myself, though.)
> With late OpenCL drivers the gap has decreased a lot, or the 680 has even
> become the winner at times - with a really tiny margin. I have never seen
> the 680 significantly outperform a 580 in any application. Like you, I have
> seen the opposite but I think that was mostly due to premature drivers that
> did not handle Kepler well.
> magnum

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