GTX 970 Benchmarks

[Flomac]

Hash.Type......: WPA/WPA2
Speed.GPU.#1...: 129.0 kH/s
Speed.GPU.#2...: 142.5 kH/s
Speed.GPU.#3...: 118.4 kH/s
Speed.GPU.#*...: 389.9 kH/s

GPU.#1 - ASUS STRIX-GTX970-DC2OC-4GD5
GPU.#2 - Palit GTX 970 JetStream
GPU.#3 - Palit GTX 970 JetStream

Glad to see you're happy. But still your new case has a few huge fans and should be able to cool these cards down. I can see there is one fan directly above the GPUs. Is that one blowing in or out? It should be blowing out, front and top should be in, rear should be out.

This is a very good example why someone should buy refernece design cards for Hashcat. GPUs in reference design with radial coolers simply push air from the front through the card and out in the back.
This is how all refernce designs look like (either AMD or Nvidia):


It's called a closed design.

This is how shodans GPUs look like:


The axial coolers suck air in and blow it towards the board. Only a tiny fraction goes out in the back (depending on airflow) and the rest stays in the case, which gets hotter and hotter.

With only one card that doen't matter that much. But from 2 GPUs up they start heating up each other.

The case shodan bought (a Cooler Master, link above) has some huge but low spinning fans. There is merely a front-to-back air flow. Only the cooler above the GPUs is useful to push out hot air.

A server case is stuffed with a bunch of high-rev fans that are urged to push lots of air hrough the case. Equipped with some refernce design GPUs that air flow goes directly through the graphic cards and properly out in the back.

Since that still seems to confuse people, maybe a "how-to-build-a-proper-multi-GPU-setup"-thread wouldn't be that bad.