How to build a 8 GPU password cracker

Hashview and Hashtopussy need to get together and talk. Would be a great combination of the technologies.

https://bitbucket.org/seinlc/hashtopussy

Eight GTX 1080s on a board that apparently has eight 16x PCI slots. The 2620 v3[1] has a maximum of 40 PCI lanes, so the GPUs are likely running in an 8x configuration.

At what point do issues with PCI bandwidth start to limit hashing power? Would this rig be faster with four Pascal Titan X cards?

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1. https://ark.intel.com/products/83352/Intel-Xeon-Processor-E5...