台式机NVMe SSD连接数量上限及非原生插槽多盘连接方案咨询
Hey there! Let's work through how you can get all 25 of your NVMe 2230 SSDs hooked up to your ROG Crosshair VIII Hero, without relying on the motherboard's native M.2 slots. Here are the most practical methods:
1. PCIe Switch扩展卡（优先推荐，高带宽）
Your Crosshair VIII Hero has plenty of traditional PCIe slots (not the M.2 ones) we can leverage with PCIe Switch chips—these are the key to scaling up your NVMe count.
- High-density cards for large slots: A single PCIe 4.0 x16 slot can handle an 8-port NVMe expansion card (thanks to a Switch chip that splits the x16 bandwidth into 8 separate x4 channels, perfectly matching PCIe 4.0 x16's total bandwidth). Just make sure the card supports the 2230 form factor, or grab cheap 2230-to-2280 adapters if needed.
- Utilize all your PCIe slots: Your motherboard has:
- CPU-direct PCIe 4.0 x16 + x8 slots: Pop an 8-port card in the x16, and a 4-port card in the x8 (x8 bandwidth is exactly enough for 4 x4 NVMe drives)
- Chipset-driven PCIe 4.0 x4 + x4 slots: Drop a 4-port card in each of these
That’s already 8+4+4+4=20 drives covered.
- Fill gaps with x1 slots: For the remaining 5 drives, use PCIe x1-to-NVMe adapters. PCIe 4.0 x1 gives 8GB/s bandwidth—plenty for daily storage tasks with 256GB drives, even if it’s not full-speed PCIe 4.0 x4. Your board has 2 x1 slots, so that’s 2 more drives, leaving 3 to cover with other methods.
2. USB4/Thunderbolt 3 NVMe Dock（补充剩余磁盘）
If you install a Thunderbolt 3 expansion card (your Crosshair VIII Hero has a ready-to-use Thunderbolt 3 header), a USB4/Thunderbolt 3 dock with NVMe support can add up to 4 more drives (using an internal Switch chip) with 40GB/s total bandwidth. That covers your remaining 3 drives easily, and even leaves room for future expansions.
- If you don’t want a full dock, a basic USB 3.2 Gen 2x2-to-NVMe adapter works for single drives too—speeds cap around 2GB/s, which is still totally fine for storage purposes.
Critical Tips to Avoid Headaches
- Power supply check: 25 NVMe drives draw roughly 125-175W total (5-7W each). Make sure your PSU has enough spare wattage, and don’t skip connecting the 6/8-pin power cables on your PCIe expansion cards—they need the extra juice.
- Cooling is key: Stacked NVMe drives get hot fast. Pick expansion cards with built-in heat sinks, or add small fans to keep temperatures in check and avoid performance throttling.
- BIOS setup tweak: Enable PCIe bifurcation in your motherboard’s BIOS (e.g., split the x16 slot into 8x4) so the Switch cards can recognize all connected drives properly.
With this setup, you’ll have all 25 of your NVMe 2230 drives up and running without touching your motherboard’s native M.2 slots.
备注：内容来源于stack exchange，提问作者Alpay Aydıngüler
