Date: Sat, 29 Feb 2020 10:16:44 -0500 From: Powen Cheng <madtomic@...il.com> To: john-users@...ts.openwall.com Subject: Re: PCI express Thank you Alexander for your input. Do you know or anyone know if tezos2john.py <https://github.com/magnumripper/JohnTheRipper/blob/bleeding-jumbo/run/tezos2john.py> this type of cracking, Will the speed of the pci express matter much? Powen On Sat, Feb 29, 2020 at 9:45 AM Solar Designer <solar@...nwall.com> 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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