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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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