Question about PCIe technology
Question about PCIe technology
Hello, I'm assembling a Z790 Aorus with a 14700k build. I plan to keep my 3080 until the next generation drops. I want a larger SSD that supports up to 4.0. I had to adjust the lane to 3.0 for my GPU, so will the new SSD run at 4.0 or are all lanes now set to 3.0? I’m aware there are some BIOS tweaks but haven’t found specifics. I understand it’s backward compatible, but I’d like to take advantage of the 4.0 feature. Thanks for the Aorus z790 Elie 14700k Asus Tuff RTX 3080 Corsair V 32gb 6400.
The MB needed to upload a video. I adjusted it to 4.0 afterward, but experienced significant frame rate drops until I switched it back to 3.
I believe there are some misunderstandings about how these systems operate. PCIe gen is assigned per slot, meaning altering one slot's version won't impact another. Lane counts can change depending on board capabilities like x16/x0 or x8/x8 features, but that’s unrelated here. Setting the GPU to PCIe Gen 3 shouldn’t make your SSD run at Gen 4—it’s unrelated. This seems more like a hardware problem. If you’re using a PCIe riser, that could be the cause, otherwise it might indicate a faulty motherboard.
I'm testing a riser setup and should have mentioned that. It's unclear if the M.2 slot connects to the CPU or PCIe lane operating at 3.0 due to the riser. I think the PCH/PCIe is on a different chipset not meant for OS use. In short, adding a new Samsung 990 would it support 3.0 or 4.0? I'll need to research bandwidth distribution and how M.2 impacts the bus.
From the view in the photo, you really manage all CPU lanes together at once. If there are no alternatives, you might have to accept that. Still, it’s not a big deal. Even with PCIe 3.0 speeds on your SSD, you seldom face needs for more than 3.5GB/s continuous writes. And SSDs only handle such high speeds until their cache gets full. Their random read/write performance (IOPS) matters much more, and the PCIe type doesn’t influence it. You can just pick any SSD you prefer!
You're relying on a 3.0 riser, meaning you'll have to accept 3.0 or discontinue the riser, probably. Comparing 3.0 to 4.0 is mainly about marketing; it's faster but usually not noticeable in everyday use.