Date: Mon, 11 Jul 2016 21:51:28 -0400 From: Rich Rumble <richrumble@...il.com> To: john-users@...ts.openwall.com Subject: Re: best way to attack bcrypt, for me On Sun, Jul 10, 2016 at 8:31 AM, Solar Designer <solar@...nwall.com> wrote: > Rich, > > On Sun, Jul 10, 2016 at 03:14:16PM +0300, Solar Designer wrote: >> There are also slightly older/smaller CPUs like "Intel Xeon E5 2670 V2 >> ES 2.30GHz 25MB 22nm 115W 10 Core LGA2011 QDNR Processor" for around >> $140 from sellers in Hong Kong. These could be more cost-effective if >> you find inexpensive dual-socket motherboards and choose to build 2+ >> cheaper systems. > > Actually, with offers like "Intel Xeon E5 2670 V3 ES 2.2Ghz 30MB 12 Core > LGA2011-3 120W 22nm Processor CPU" for $194, it makes little sense to go > for anything older than v3 even if you build many cheaper systems. > > You need v3 for AVX2, which provides almost a 2x speedup (over AVX) for > many hash types other than bcrypt. (You'll run many of those other hash > types on GPUs once you add GPUs to the system, though.) For bcrypt, v3+ > is about 30% faster than v2 and older. Thanks for all to answers, from my reading I thought this would be the case for my budget. Thanks! -rich
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