Date: Sun, 9 Dec 2012 00:34:14 +0100 From: magnum <john.magnum@...hmail.com> To: john-users@...ts.openwall.com Subject: Re: GPU based cracking, AMD or NVIDIA On 9 Dec, 2012, at 0:19 , Solar Designer <solar@...nwall.com> wrote: > On Sat, Dec 08, 2012 at 11:40:38PM +0100, magnum wrote: >> On 8 Dec, 2012, at 19:57 , Solar Designer <solar@...nwall.com> wrote: >>> 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. > > This is interesting. Can you post any specific benchmark results? Will do. The only concrete example I have from memory is NTLMv2, which is not a good comparison because it is severaly limited by transfer speed. Anyhow, I saw the Kepler win with what looked "significant" to my eye (but that might be just above 19M vs just below 18M, which is not a great deal) and the two machines were identical except for the GPU cards. This fits with what Milen says. But I am also pretty sure I have seen "slow" formats perform just a tiny bit better with Kepler at slow formats, with decent drivers. I'll collect some statistics next time I get a chance. Regardless of what single-digit percentage boosts I *may* report later, this is silly. A GTX680 released 2012 should be significantly faster than a GTX580 from 2010. Someone please explain Moore law to nvidia :-) magnum
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