TerraMaster Forum

Hello, i find on my u4-500 free pcie x4 slot, he is gen4 ? possible add on this slot another nvme or 25gbps NIC ?

zerom1nd wrote: ↑30 Sep 2026, 20:29… found on u4-500 a free pcie x4 slot, is it gen4 ?
possible add on this slot another nvme or 25gbps NIC ?

If it's not behind a 600 series PCH on the motherboard, then yes, it's Gen4×4, right from the CPU itself.

Technically, you could add anything into the slot (with an extension since the 1U height would limit vertical install), however TOS might not recognize it if drivers aren't available/installed for it; if you're running an alternate OS & drivers exist or can be injected/installed, then you can use whatever you've installed.

The U4-500 has a reserved standard PCIe slot position inside the chassis. The physical form factor of the slot is PCIe x4, while the actual signal runs at PCIe 3.0 x2. Due to the structural constraints of the U4-500 enclosure, no PCIe expansion devices can be installed in this slot.

TMjack wrote: ↑Yesterday, 09:27 The U4-500 has a reserved standard PCIe slot position inside the chassis. The physical form factor of the slot is PCIe x4, while the actual signal runs at PCIe 3.0 x2. Due to the structural constraints of the U4-500 enclosure, no PCIe expansion devices can be installed in this slot.

Hello, slot is not actived ? devices in this slot not will be work ? if i try install nvme ?

zerom1nd wrote: ↑Today, 00:14

The PCIe slot itself is electrically active and is not disabled at the hardware level.

However, due to structural and space constraints inside the 1U chassis, as well as a lack of driver and hardware support in TOS, installing PCIe expansion devices (including NVMe) is neither supported nor recommended.

Thank you for your understanding!