Quad 1080 ti Build | Need Hardware Advice
#1
Hi All-

I'm looking to purchase a new GPU cracker with the following hardware below.  Would love to get some feedback on the build.  I have already procured the 4x1080ti FE graphics cards, so no need to comment how they are very low stock at this point.
  • Motherboard: ASUS X99-E WS/USB 3.1 LGA 2011-v3 Intel X99 SATA 6Gb/s USB 3.1 USB 3.0 CEB Intel Motherboard
  • GPU: 4x EVGA GeForce GTX 1080 Ti FE DirectX 12 11G-P4-6390-KR
  • CPU: Intel Core i7-6800K Broadwell-E 6-Core 3.4 GHz LGA 2011-v3 140W BX80671I76800K Desktop Processor
  • Memory: G.SKILL TridentZ Series 64GB (4 x 16GB) 288-Pin DDR4 SDRAM DDR4 3200 (PC4 25600) Intel X99 Platform Desktop Memory Model F4-3200C16Q-64GTZKO
  • CPU Cooler: New Cooler Master GeminII S524 Ver 2 RR-G5V2-20PK-R1 120mm CPU Fan For Intel
  • Case: Phanteks Enthoo Pro Series PH-ES614P_BK Black Steel / Plastic ATX Full Tower Computer Case
  • PSU: Rosewill 1600W Modular Gaming Power Supply, Continuous @ 50 Degree C, 80 PLUS GOLD Certified, SLI & CrossFire Ready – HERCULES-1600S
  • HDD: SAMSUNG 850 EVO 2.5″ 500GB SATA III 3-D Vertical Internal Solid State Drive (SSD) MZ-75E500B/AM
I'm open to all advice, but my primary question is if the LGA 2066 socket motherboards and CPU is something I should be considering at this point?  I'm not sure if the LGA 2066 motherboards offer the PCI-e x16/x16/x16/x16 speed throughput that the ASUS X99 offers and is known for.
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#2
x16 throughput is not important for most hashcat attacks. x4 is the minimum from my testing, for both hashcat and john.

Having some RAM and CPU to feed the GPUs for some attacks is a good call. Ditto for the choice of FE. I've read that having the same amount of system RAM as GPU VRAM is recommended. I don't fully understand the reasoning for that yet. GPU-resistant algorithms like scrypt can certainly use some system RAM when used on CPU.

I don't have experience with the Tis so I'm not sure about real-world power draw, but back of the napkin, this looks sane.
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#3
Looks ok so far. You might want to get a better PSU with Platinum auf Titanium rating, if your system will run a lot of 24/7s.
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#4
(11-29-2017, 12:42 AM)royce Wrote: x16 throughput is not important for most hashcat attacks. x4 is the minimum from my testing, for both hashcat and john.

Having some RAM and CPU to feed the GPUs for some attacks is a good call. Ditto for the choice of FE. I've read that having the same amount of system RAM as GPU VRAM is recommended. I don't fully understand the reasoning for that yet. GPU-resistant algorithms like scrypt can certainly use some system RAM when used on CPU.

I don't have experience with the Tis so I'm not sure about real-world power draw, but back of the napkin, this looks sane.

Max is 300w if you raise the limit with nvidia-smi, but realistically I don't see mine get past about 260w each.
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