need help to Finish my first Rig of 8 GPU titan x? (perhaps somthing is missing?)

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Yes with 8x Titan X you will have 96GB of VRAM, but iirc hashcat doesnt use the full amount of VRAM available. But in the end you cant go wrong with 128GB.

Ah good, just wanted to be sure, your wording sounded abit strange, no wrong though.