Slot spacing on motherboards is a challenge due to high frequency signal attenuation. You have finite limits on how far your slots can be from the CPU. Your s

Slot spacing on motherboards is a challenge due to high frequency signal attenuation. You have finite limits on how far your slots can be from the CPU. Your signal budget/allowable distances are decreasing as each successive PCIe generation runs at a higher frequency. Yes, you can space out slots widely, however this means you have to use PCIe redrivers/retimers which adds cost to the board. You can also use different materials for the motherboard but again, this adds cost. We'd love to provide better slot spacing configs, but there are technical and commercial tradeoffs to be made.