With 8 drives in a mounting system with only minimal dampening and an aluminium case, I think the baseline noise will be high enough that fan configuration is not going to be the biggest issue for noise. Are you absolutely set on that case?
Perhaps it is better to understand what it is you intend you use the computer for? Is it likely to be running highly parallelised, CPU intensive calculations for hour after hour or only occasional times when it will be running hot?
Yes edh, I realize it will be hard on the noise issue, but need a case with 8-9 hot-swappable drives.
Need enterprise quality on the drives which also doesn't help.
I can't find any alternative utilizing that.
It's a combination of a normal desktop usage, occasional gaming and a server, most of the time it will be idle.
Planning to damp the case and bays with bitumen plates