TheLostSwede
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Intel only does x16 PCIe 5.0 lanes for the "GPU", but board makers are splitting it into x8 for the "GPU" and x4 for one M.2 slot on a lot of boards, with four lanes being lost. Some higher-end boards get two PCIe 5.0 M.2 slots.This modern trend needs to die or I'm not updating my pc, simple.
Though to be fair x8 doesn't loose that much performance.
Also that's not right, you get 1x16 ,1x nvme and the southbridge unless you want two nvme attached direct to CPU no?!.
As AMD has two times x4 "spare" PCIe lanes (plus four to the chipset), it's not an issue on most AM5 boards, but there are some odd boards still split the PCIe 5.0 lanes to the "GPU" and use them for M.2 slots.
Yes, x8 PCIe 5.0 lanes are in theory x16 PCIe 4.0 lanes, the issue is that a x16 PCIe 4.0 card, ends up as a PCIe 4.0 x8 card in a PCIe 5.0 x8 slot.You could have 2-3 NVMe drives in the same system. That said, you'd also need a motherboard that only wires 4-8 PCIe5 lanes to the GPU slot, freeing the rest for your SSDs.
And really, we've had this discussion since PCIe2: every time a new PCIe revision comes out, it offers more bandwidth than the GPUs need. It's ok to not use the latest and greatest.
The PCIe spec doesn't allow for eight lanes to magically end up being 16 or 32 lanes of a lower speed grade, it requires an additional, costly chip.
As for the slot mix, with bifurcation it's not a problem to split the lanes on the fly, so as long as you don't use the M.2 slots, your x16 slot remains x16.
AMD allows that, Intel does not as yet.Completely seperate 1* 5.0 x16 for GPU, 2* 5.0 x4 for NVMe would be the best solution, whether it's AMD's or Intel's boards.