Five common lane-sharing inquiries
Five common lane-sharing inquiries
I'm considering the ASRock Z790 Nova WiFi for a new setup. It has a Gen 5 M.2 port and an X16 PCIe (Gen 5) slot that shares lanes. If I install a Gen 5 NVMe drive in the first M.2 slot, the X16 slot operates at Gen 5 x8 speed. My concern is whether the graphics card (Gigabyte WindForce 4070) would run at Gen 4 x8 or Gen 5 x8. Since x8 Gen 5 equals x16 Gen 4, it should work fine if it matches the effective speed of Gen 5 x8. However, if it runs slower than expected, that would be a notable difference. The document explains this behavior in detail.
They're using 40-series cards that support PCIe4, which means they'll operate at that speed. A 50-series setup would need Gen5, but a Gen5 SSD isn't really suitable for a gaming PC—Gen4 is more than enough.
The available pathways to the device remain fixed and cannot be altered by the PCIE standard. This means that regardless of whether the GPU lanes are reduced to eight using a PCI-E 5.0 M.2 slot, they will never exceed eight. It doesn't matter if your graphics card is from Gen 2 or Gen 5. Any Intel motherboard with a PCI-E 5.0 slot will share lanes because these processors lack extra PCI-E 5.0 channels. Are you considering older Intel CPUs instead of newer models like the 15th generation, Core Ultra, or AMD AM5?
The usable bandwidth would be restricted to gen4x8. The need to look at gen14 comes from the observation that gen15 appears to lag behind gen14 in certain games. Another point is cost efficiency. Recently, I've been checking how PCIe gen5 is implemented on gen14 versus gen15, and gen15 is now back on the radar. Besides that, any additional factors encouraging a move to gen15 over gen14? Also, regarding the 1851 socket—what generation should we anticipate it reaching (core ultra 3xx or 4xx)?
The 13th-14th generation processors may have issues (which is why you receive a five-year extended warranty on retail K/KF CPUs), and some users have even had to return them for exchange (RMA). There are mixed reports, but it seems possible that 1851 might only see a minor update or none at all. That’s uncertain.
When it aligns with their requirements, it becomes more effective.
They mentioned the 14th generation was being considered because the 15th appears to underperform in certain games, and the main reason was cost savings. It seems like there might be another purpose beyond gaming, though that's not explicitly stated.
You can try this... if it matters, just use the slot labeled m2_2. SSD speed mainly depends on their ability to manage low queue depths. It doesn't matter if the top limit is 14,000MBps when the "1% lows" are actually around 50MBps. Most PCIe Gen 5 SSDs only operate at full speeds for big file transfers and even then just for a short period. PCIe performance isn't really useful for video cards either. Something I’ll note is that Core Ultra CPUs seem to struggle with SSDs unless there’s a change.