Does x16 SLI actually matter? on a Z270 cpu
4 hours ago, ProRules said:Hello, ive been wondering for a while if its worth taking a motherboard that supports X16 x2 pcie slots, if the cpu only has 16 pcie lanes?
Beacause if it has only 16 pcie lanes, doesn't this mean it will be x8 anyways on both cards?
It depends on the wiring. If the 16x slots are linked directly to the CPU, you won't get any more active lanes than the CPU can handle. But if the PCIe slots are routed through the chipset, you'll be limited by the bandwidth between CPU and chipset.
Typically, PCIe slots aimed at GPUs are meant to use the lanes coming from the CPU, so you are always limited by the CPU lanes, regardless of what the chipset provides (you can use those extra lanes for other things plugged in the other slots). But there are some exceptions to the rule (notice that, in any case, PCIe devices routed through the chipset will be even more limited in terms of bandwidth than an x8 slot).
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