Searching for suitable options for 9950x3d with an 870E motherboard.
Searching for suitable options for 9950x3d with an 870E motherboard.
Typically, most x870e boards allocate CPU lanes for USB4, making it a necessity. If you're not keen on USB4 and prefer using two NVMes with PCIe 5.0 without changing the x16 connection in the main slot, consider alternatives for x670e models. It's clear this situation exists. Consumer CPUs usually have fewer than 30 PCIe lanes, so achieving dual x16 would demand 32 lanes in total.
For instance, when both PCIEX16_1 and PCIEX16_2 are active, each will operate in x8 mode.
Ryzen 7000 and 9000 models feature a combined 28 PCIe lanes. About four are dedicated to the chipset, which reduces your general-purpose capacity to 24 lanes. Four of these are consistently reserved for NVMe, leaving just 20 lanes available. On the X870E, four lanes are fixed for USB4, so you’re left with 16 lanes. This often means the main PCIe slot is limited to eight lanes, which is why adding another NVMe connection caps it at x8. With other chipset designs, you might fit another NVMe in the CPU area, giving you 16 lanes—enough for one card or two sharing the x8 slot. Intel’s ARL supports 20 PCIe 5.0 lanes for general use, typically pairing a high-end GPU with four NVMe lanes. Raptor Lake offered 16 PCIe 5.0 plus four x4 lanes, ideal for GPUs and NVMe devices.
Thanks, that resolved the final piece of the puzzle. I think this is where you begin exploring Threadripper and similar options to increase PCIe lanes. At this stage, it depends on whether they utilize dedicated lanes like USB4 or if they share them in a way that limits performance or splits the bandwidth further.