Date: Sat, 29 Feb 2020 15:45:08 +0100 From: Solar Designer <solar@...nwall.com> To: john-users@...ts.openwall.com Subject: Re: PCI express 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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