10G Typical Power Consumption of Just 1.79W – A Power Consumption Breakdown for 24/7 NAS

For NAS devices that run 24/7, network card power consumption is never an isolated parameter – it directly determines chassis heat and noise. The LEKUO PR27F11 consumes just 1.79W at typical 10G speeds. What does this number really mean? It's worth breaking down from a deployment perspective.

Putting 1.79W into a 24/7 NAS Context

First, let's do the long-term math: 1.79W × 8,760 hours per year ≈ 15.7 kWh annually. The electricity cost alone is almost negligible, but that's not the core value of low power consumption in a NAS. The real key lies in heat and noise:

  • Heat: With a 1.79W chip generating extremely low heat, the entire card requires virtually no additional cooling structure. Even during sustained full-speed transfers, it won't become a noticeable heat source inside the chassis.
  • Noise: There's no active cooling fan, so there's no fan whine. The chassis fan doesn't need to spin up specifically for this card.
  • Stability: In compact devices where internal temperatures and airflow budgets are already tight, one less heat source means more thermal headroom for the overall system.

First, Let's Be Clear – What Kind of Card Is This?

The PR27F11 is a PCIe to single-port 10G SFP+ fiber optic network card, powered by the Realtek RTL8127 controller. The physical interface is standard PCIe X4 (compatible with X4/X8/X16 slots, actually running on PCIe 3.0 X2 lanes). On the network side, it offers a single SFP+ fiber port. The card does not provide dual ports, does not require external power, and does not use a USB4 bridge – it is positioned as a standard PCIe internal network card. This simplified design is precisely what enables its low power consumption and compact footprint.

Compact Size: A Must-Have for Tight Chassis

In small-form-factor chassis, physical dimensions matter beyond just "will it fit?" – it's about whether effective airflow remains after installation. The thinner the card and the less it obstructs adjacent slots, the lower the chance of physical conflicts when adding M.2 adapter cards, capture cards, or other expansion devices later. For space-constrained NAS devices and small hosts, this is a practical metric that directly impacts expandability.

Use Cases and Boundaries

  • Best suited for: NAS devices, half-height mini PCs, and industrial PCs that run 24/7; environments where single-link 10G is the primary requirement (e.g., NAS-to-editing workstation direct transfers for 4K/8K素材); users who demand quiet operation, low temperatures, and 24/7 stability from their network card; and those who need basic networking features like VLAN, WoL, and PXE.

Frequently Asked Questions

Q: Does the PR27F11's SFP+ fiber port require purchasing optical modules separately?
✅ Yes. The SFP+ fiber port must be used with a 10G SFP+ optical module (multi-mode or single-mode, depending on cable distance) and fiber patch cables. It does not directly connect to RJ45 copper devices. Just make sure to confirm that the modules and patch cables are included with your order – this is not a product defect.

Q: Does it support Wake-on-LAN (WoL) and PXE network boot?
✅ Yes. The PR27F11 fully supports WoL remote wake-up, PXE, and EFI network boot, making it suitable for diskless boot, virtualisation host NICs, and other scenarios that require power-on self-boot or remote wake-up.

Q: Can it be installed directly in a half-height chassis without replacing the bracket?
✅ Yes. The PR27F11 ships with a low-profile bracket pre-installed, designed specifically for half-height chassis. Users can install it directly into a half-height slot without needing to replace the bracket themselves.

Summary
The LEKUO PR27F11 PCIe to single-port 10G SFP+ fiber optic network card, powered by the Realtek RTL8127 controller, delivers just 1.79W of typical 10G power consumption with extremely low heat output and a fanless silent design. It ships with a low-profile bracket as standard, making it ideal for NAS devices, half-height mini PCs, industrial PCs, and other 24/7 always-on systems. With support for VLAN, WoL, PXE, and other essential networking features, it is a practical choice for low-power 10G fiber network upgrades in compact chassis.