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Date: Sat, 29 Feb 2020 10:16:44 -0500
From: Powen Cheng <>
Subject: Re: PCI express

Thank you Alexander for your input.

Do you know or anyone know if
this type of cracking, Will the speed of the pci express matter much?


On Sat, Feb 29, 2020 at 9:45 AM Solar Designer <> wrote:

> Hi,
> On Sat, Feb 29, 2020 at 09:11:20AM -0500, Powen Cheng wrote:
> > Does it matter is a card is on pci express 3.0 x16 or pci express 2.0 x1
> > slot?
> >
> > Will the higher bandwidth perform better and generate more hash rate?
> This depends on hash type and cracking mode.  For slow hashes (and
> "non-hashes"), the difference will be small.  For faster hashes, the
> difference will be substantial, except that for the fastest hashes when
> using on-device mask mode it'll be small again.
> In other words, when using JtR, PCIe bandwidth has the most impact on
> medium-speed hashes - e.g., on md5crypt.  It is mostly irrelevant for
> the slowest hashes (they're similarly slow either way) and for the
> fastest hashes (even the fastest PCIe isn't fast enough for them, so
> they need on-device mask mode to reach the device's full potential).
> Alexander

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