January 24, 20224 yr I'm upgrading my computer and got a new case to put it all in (Corsair 4000D). This is my first case that supports the possibility of a vertical GPU. I like this for aesthetics, cooling, and to support the weight of the graphics card. I have a RTX 3090 on an Asus Z690-E motherboard. My first go with a Corsair 300 mm riser PCIE 3.0 x16 riser (they almost all seem to be PCIE 3.0 x16), the computer would not boot with a motherboard error code for the GPU. I plugged the GPU straight in to the motherboard and it booted fine. So on to the thoughts and questions: 1. This motherboard has 3 PCIE x16 4.0 slots...a gen 3, gen 4, and gen 5. The gen 5 is the closest to the CPU and the one I used. Should I be using any slot in particular? 2. I've seen a recommendation to set PCIE to gen 3 in bios. This decreases the bandwidth. The few sites I found that gave any numbers, RTX 3090 performance is marginally affected, but very mildly. However, I question this, as the cables are almost all universally PCIE 3.0 x16 with statements that even the RTX 30 series do not saturate the PCIE 3.0 bandwidth. I have a USB expansion card (PCIE x1) and 3 m.2 NVME drives. Would changing the PCI to gen 3 affect these transfer rates as well? Does anyone have any comments on getting the riser to work, and/or any performance issues with any particular solutions (such as point 2)? Eric Szczesniak
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