Discussing X670E chipset and PCI lanes involves understanding its connectivity options and performance capabilities.
Discussing X670E chipset and PCI lanes involves understanding its connectivity options and performance capabilities.
I purchased a ROG Crosshair Hero X670E motherboard. The PCIe lane information is mixed up in different sources. On AMD's site for the Ryzen 7700X it lists up to 24 or 28 lanes, while Asus Manual suggests only 16 lanes for the GPU and 8 for storage. It seems the storage lanes are taken from the GPU, leaving the remaining lanes for other purposes. Clarifying this should help avoid confusion.
According to what I understand, these boards use M.2 cards that can accommodate up to four NVMe drives—sometimes eight. Each card provides four lanes, so they need 16 lanes total. The drives connect via a PCI-E port rather than the standard M.2 connector on the board. It seems this setup is designed for two drives, making it eight in total. Sometimes having both drives connected can cause one to be routed through the CPU lane while the other through the chipset lane, which might block SATA connections. The newer drives offer a bit more PCIe capacity (previously 20 lanes), so there’s usually a cap at one PCIe slot before other functions are affected.
It’s actually quite straightforward once you get the phrasing right. The setup includes two PCIe x16 ports. Initially, only the first one is active, allowing full x16 speed. Once the second port connects, the first operates at x8 and the second also at x8. There are four NVMe slots built into the board—two directly connected to the CPU using x4 PCIe Gen 5, and the other two via the chipset using x4 Gen 4. None of these slots interfere with the PCIe devices. The confusion arises because ASUS aimed to add another NVMe slot but ran out of space on the PCB. Instead, they included a PCIe Gen 5 adapter with the motherboard, so the message refers to how the GPU will behave when using that adapter—effectively limiting it to x8 performance regardless. If you won’t need that extra card, there’s no issue.
You explain the value comes from factors beyond just the CPU price, like RAM, storage, and connectivity options. You question whether PCIe lanes are necessary and emphasize that gaming isn't a priority. Your concern is about spending money on expensive motherboards that don’t deliver real benefits. You also mention considering returns if the purchase doesn’t meet expectations.
unlike previous jokes about crosshair boards failing against the proart line this time, the proart line seems to underperform compared to the crosshair in I/O. However, if you don’t really need a lot of I/O, it’s still not worth it. Still, those features of the crosshair that matter mostly are just pointless except for XOcers, but those people would likely prefer a board like the Z690 kingpin. Voltage regulators are common, but you won’t get much progress without direct die due to terrible IHS design (they’re also too thin). Good RAM topologies are useless because of the clock issue unless you have something above 8000 MHz or something similar.