Is RTX3090 suitable for multiple GPUs working together in the same chassis?

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I dont think 3090 FE will fit into any existing 19" case from brands like Tyan or Supermicro. It needs a 3 Slot spacing, which probably no Server Mobo has plus you will likely run into issues concerning height, at least with something 4U high.

2 in a desktop chassis might work, but it has to be determined how much the hot exhaust from the lower one affects the upper one.

I agree with Sondero, Mining-style open frames are probably the only way of stacking more than 2.