B450 mobo with 2 PCI-E x16 slots populated. Am I losing GPU performance?
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Solved by YoungBlade,
You shouldn't be losing any performance at all. The bottom 3 slots are run out of the chipset and use the chipset lanes to communicate with the CPU. For this reason, the top x16 slot is unaffected by putting cards in the lower slots.
Looking through the manual, the only place where you lose connectivity is that the bottom PCIe slot is disabled if you install a second M.2 drive into the lower M.2 slot. If you ever install a second M.2 SSD, and you still want to use the soundcard, you'll need to invest in a riser cable and run it from one of the x1 slots.
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