3 ms·
> eg what requires 4.0 x4 could use 6.0 x1 FWIW, this is only true for newer hardware. ie if you plugged in a pcie gen3x16 device into a pcie gen4x8 slot, alth
by steelbrain 2y ago
> eg what requires 4.0 x4 could use 6.0 x1
FWIW, this is only true for newer hardware. ie if you plugged in a pcie gen3x16 device into a pcie gen4x8 slot, although the bandwidth provided is in the same ballpark, the device will only run at pcie gen3x8.
So we'll need until the devices upgrade themselves to gen4 in this scenario to make use of higher bandwidth.
- Arnavion 2y agoI'm not saying the device itself would negotiate a higher PCIe version. I'm saying that the 4.0 x4 M.2 NVMe slot on your mobo would map to only one 6.0 CPU lane.
- seritools 2y agoHuh, I was pretty sure that you need an extra chip in-between. Otherwise, the 4 CPU lanes will just drop to 4.0 level.
- Arnavion 2y agoYes you do.
- Dylan16807 2y agoYou'd need a bunch of those chips to make good use of a bunch of 6.0 lanes on the CPU, and at that point you're paying so much for the converters that I'm skeptical it would almost ever be worth it. I expect consumer machines to keep doing some conversion and expansion in the chipset, but nowhere else. I expect servers to directly attach almost everything and drop down to smaller lane counts for large numbers of devices. It's worth noting that when Kioxia first put out PCIe 5.0 EDSFF drives, they were marketing them as being optimized for 2 lanes at the higher speed.
- deleted 2y ago[deleted]
- KeplerBoy 2y agoIt could still help connecting the chipset. Not all pci-e lanes on your motherboard are created equal: Some are directly attached to the CPU others are connected to the chipset, which in turn is connected to the CPU. It's possible to convert a single 5.0 x16 connection coming from the CPU to 2 4.0 x16 connections.