4x SLI GTX 1060 Hashcat Rig

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RAM is pretty cheap, better to have "too much" than not enough. RAM also helps with tasks like wordlist manipulation (e.g., ''sort -u -S 32000M''), or using hashcat features like --show and --left against large hash lists. So while I wouldn't go any lower than 16GB, there's certainly nothing wrong with 32GB if you can afford it (should only be like $100 extra)