Expert Needed - Running 72 Gpu on a single board (72x PCIe)

[Heaven_34]

Hi Everyone!

I need an expert to answer my question because it's very tricky.

Here we go:
I have multiple MOBO: GIGABYTE GA-990FX-Gaming AM3+ AMD 990FX SATA 6Gb/s USB 3.1 USB 3.0 ATX AMD Motherboard

Currently, I'm running 6x470 amd per board using riser 1x to 16x pci-e and the performance of the card is perfect.

My question: How do I know ''how much a card is saturating my motherboard pci-e total speed?''

Why? Because i've seen pci splitter, 1 time 16x pci-e to 12 time pci-e 8x...

Would that work if I put 6 splitter on my motherboard, giving me 72 pci-e 8x ?! If we dont take PSU in the addition indeed.

I mean, how do I know my total speed available and how much a card consume before putting too much splitter and just saturating everything??

Thank you!

 

[COLGeek]

The 990FX chipset only supports 38 PCIe lanes. Once you saturate those lanes, I would suspect adding additional GPUs does little or nothing (in terms of additional performance.

For more info, see here: https://en.wikipedia.org/wiki/AMD_900_chipset_series#990FX

So, what are you trying to accomplish with this potential cluster of GPUs?