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I'm running two RTX 3090 at PCIe 4.0 x8 on a X570 board w/ 128GB DDR4 @ 3200. Going beyond that is very expensive right now. The AMD X670 chipset offers 28 PC
by Tepix 3y ago
I'm running two RTX 3090 at PCIe 4.0 x8 on a X570 board w/ 128GB DDR4 @ 3200.
Going beyond that is very expensive right now.
The AMD X670 chipset offers 28 PCIe 5.0 lanes, can't you make a mainboard with three x16 PCIe 4.0 slots out of that?
Ideally two models:
One with 2-slot spacing (for watercooling) and another (oversized) board with 3-slot spacing for cases like the Fractal Design Meshify 2 XL.
- c_o_n_v_e_x 3y agoSlot 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.
- Tepix 3y agoThere are boards on the market that offer four PCIe 4.0 x16 slots at 2x spacing. Offering three PCIe 4.0 x16 slots at 3x spacing means just going one slot position further. I hope it's possible.