02-26-2016, 12:00 AM
I understand the chassis fans are what are making noise. What I'm saying is drop the chassis fans down in the bios (bios should have some feature to let it control the fan speed automatically). Then spin your GPU fans up to 100% before starting Hashcat, and drop them back down to 25% when you're done. You don't need crazy chassis fans with only 4 GPUs, the GPU fan is what matters.
No, 80C is not normal for a 980, that's 10-20 degrees higher than you should be running in a 4-GPU setup. To clarify, you won't do any short-term damage running at 80C, but that's only a 160W GPU, so your temps are a strong indication you are doing something very wrong. Maybe you're using OEM design cards, maybe you're letting the GPU BIOS control the GPU fan speed automatically, maybe you hashcat will manage your GPU fan speed for you. Whatever it is, you're doing it wrong, and focusing on the chassis fans is not the place to start looking.
No, 80C is not normal for a 980, that's 10-20 degrees higher than you should be running in a 4-GPU setup. To clarify, you won't do any short-term damage running at 80C, but that's only a 160W GPU, so your temps are a strong indication you are doing something very wrong. Maybe you're using OEM design cards, maybe you're letting the GPU BIOS control the GPU fan speed automatically, maybe you hashcat will manage your GPU fan speed for you. Whatever it is, you're doing it wrong, and focusing on the chassis fans is not the place to start looking.