this post was submitted on 10 Dec 2023
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Ah, I think I'm starting to understand this a little better. Is that 4 lanes for SATA and 1 for the PCIe x1 slot?
Where do you reckon the PCIe 2.0 x16 slot's lanes come from?
Nah SATA is built into the chipset. That second x16 is actually only electrically x4 in an x16 form factor, and there's that x1 slot, adding up to 5 lanes in total. The first x16 and first nvme slot (x4) are connected to the CPU directly (which IIRC most have 20 lanes on AM4, but not always).
Oh, that makes sense, thanks
My CPU (1600 AF) only has 16 lanes, but I have a graphics card and an NVMe SSD and both seem to be getting all the lanes. I wonder what's going on here
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Edit:
Huh that's interesting, I believe that GPU should've been running at x8 with that CPU, but if it works then whatever I suppose.
I believe there are PCIe bandwidth benchmarks, if you really want to confirm, but I wouldn't worry.
Also it isn't uncommon for the device to just report the wrong speed, for example my Intel Arc reports running at x1, but benchmarks show otherwise.