CWWK N355 DIY NAS Review

CWWK N355 DIY NAS Motherboard Review

The CWWK N355 DIY NAS motherboard is a Mini-ITX board designed for users looking to build a compact yet powerful NAS system with high storage capacity and expansion potential. Featuring the Intel Twin Lake N355 processor, dual 2.5GbE networking, six SATA ports, and two NVMe slots, it balances performance and affordability. With PCIe 3.0 expansion and a power-efficient CPU, it provides a solid foundation for home lab enthusiasts and small-scale NAS builders. However, it does come with some limitations, particularly in PCIe lane allocation and component placement. This review covers design, hardware, storage, performance tests, and overall value to determine whether it’s the right choice for your next DIY NAS project.

Available in two configurations, the N150 quad-core version ($174) and the N355 octa-core version ($288), this motherboard positions itself as a budget-friendly but capable alternative to more expensive NAS solutions. While the onboard features are generous for the price, the placement of components and some design choices might limit expandability for certain users. Let’s dive deeper.

Component	Details
Processor (SoC)	Intel Twin Lake N355 (8 cores, 8 threads, 3.9GHz max turbo)
Memory	1x SO-DIMM DDR5 4800 MHz (up to 48GB, Non-ECC)
Storage Slots	2x M.2 NVMe PCIe 3.0 x1 (2280)
SATA Support	6x SATA3.0 ports (ASM1166 controller)
Networking	2x 2.5GbE RJ45 (Intel i226V controllers)
USB Ports	1x USB 3.0, 3x USB 2.0, 1x USB 3.0 internal header, 1x USB 2.0 internal header
Video Output	1x HDMI 2.0, 1x DP 1.4 (4K@60Hz)
Expansion	1x PCIe 3.0 x4 slot
Power Supply	24-pin ATX + 4-pin CPU power connector
BIOS Features	Auto Power On, Wake-on-LAN (WoL), PXE Boot
Form Factor	Mini-ITX (17 x 17 cm)

Where to Buy? CWWK N355 MITX NVMe NAS ($184-295 AliExpress) – HERE CWWK x86 P6 NVMe NAS Box ($160 AliExpress) – HERE DIY N355 NAS Products ($254-349 Amazon) – HERE

CWWK N355 NAS Review – Quick Conclusion

The CWWK N355 DIY NAS motherboard provides a solid balance between affordability and performance, making it a strong option for NAS builders and home lab users. With six SATA ports and two NVMe slots, it offers flexible storage options, while dual 2.5GbE networking ensures decent network speeds. The PCIe 3.0 x4 slot allows for expansion, but lane allocation limitations could be a bottleneck for certain configurations. Power efficiency is excellent, and during testing, the N355 CPU handled multiple VMs, media streaming, and general NAS tasks well. However, thermal management and component placement could have been better, particularly around the PCIe and SATA ports.

Overall, the CWWK N355 is a capable Mini-ITX NAS motherboard, especially for those comfortable with DIY setups. The lack of ECC memory support, PCIe lane sharing, and close component placement are drawbacks, but for the price, it remains a versatile and well-featured board.

BUILD QUALITY - 9/10

HARDWARE - 9/10

PERFORMANCE - 8/10

PRICE - 9/10

VALUE - 9/10

8.8

PROS

👍🏻Compact Mini-ITX design, ideal for NAS builds
👍🏻Dual 2.5GbE ports for enhanced network performance
👍🏻Six SATA ports for ample storage expandability
👍🏻Two NVMe slots for high-speed SSD caching or storage
👍🏻Energy-efficient Intel N355 CPU with low power draw
👍🏻Good virtualization support for lightweight VMs and containers
👍🏻Strong media streaming performance, including Plex compatibility
👍🏻Affordable price point compared to similar NAS motherboards

CONS

👎🏻PCIe slot placement may block SATA ports with larger cards
👎🏻Limited PCIe lanes constrain high-speed expansion options
👎🏻No ECC memory support, which may be a concern for some user

CWWK N355 NAS Review – Design

The CWWK N355 DIY NAS motherboard follows a compact Mini-ITX design, offering a good mix of functionality and space efficiency. Its 10-layer high-density PCB provides durability, while the standard ATX 24-pin power and 4-pin CPU power connectors make it easy to integrate into various NAS chassis. The purple PCB aesthetic is unique, setting it apart from many other DIY NAS motherboards. However, despite its compact build, some of the design choices create challenges when it comes to expandability.

One of the most noticeable issues is the placement of the PCIe 3.0 x4 slot in relation to the SATA ports. While the board allows for expansion cards like RAID controllers or 10GbE adapters, the proximity of the PCIe slot to the six SATA ports means that larger cards can obstruct some of the SATA connections.

This could force users to choose between additional network connectivity and full SATA drive support, which is an unfortunate trade-off. Ideally, an SFF-8087 or OCuLink alternative for SATA connectivity would have been a better approach, reducing port congestion.

The built-in cooling options are fairly basic, with a single CPU fan header and two system fan headers (only one supporting PWM). While the board is designed for low-power efficiency, adding high-performance storage or running multiple VMs may generate additional heat that requires better cooling.

The included stock CPU cooler is not ideal, as it sits too close to nearby components, making it harder to install without interfering with the SO-DIMM DDR5 memory slot. Users are advised to invest in a third-party low-profile cooler for better thermal management.

On the connectivity side, dual 2.5GbE network ports (Intel i226V) provide solid networking performance for most NAS use cases, with support for SMB Multichannel and link aggregation. The limited USB selection, however, could be a concern.

With only one USB 3.0 port and three USB 2.0 ports, users relying on external storage or bootable USB setups may find the available connections restrictive. That said, the internal USB 3.0 and USB 2.0 headers provide some additional flexibility for internal USB-based boot drives, but a few more rear-facing USB ports would have been welcome.

CWWK N355 NAS Review – Storage

Storage is a key strength of the CWWK N355 motherboard, with a combination of six SATA3 ports and two M.2 NVMe slots offering flexibility for different storage configurations. The ASM1166 SATA controller is responsible for managing the six SATA ports, providing stable performance for hard drives and SSDs. Users looking to build a NAS with high-capacity drives will appreciate the dedicated SATA expansion, which supports RAID configurations through software.

The two M.2 NVMe slots, while a welcome addition, are limited to PCIe 3.0 x1 speeds, meaning they can only reach maximum sequential throughput of around 780-800MB/s. This is a clear limitation compared to PCIe 3.0 x4 NVMe slots found in higher-end boards. However, these slots are still useful for caching or fast-access storage, especially when paired with SATA drives for bulk data storage.

During testing, a RAID 0 setup with six 4TB HDDs achieved 650MB/s sustained throughput, showing that the ASM1166 controller handles multiple drives efficiently. Performance with SATA SSDs was better, with speeds saturating the SATA3 interface at 550-560MB/s per drive. Users expecting enterprise-level speeds may find this limiting, but for general NAS applications, it performs well.

Another consideration is PCIe lane allocation. Because the ASM1166 controller operates on a PCIe 3.0 x1 interface, total throughput is shared across all six SATA ports. This means that in heavy read/write operations across multiple drives, users might encounter bottlenecks. Those planning on maximizing SATA performance should ensure efficient data distribution across drives.

Ultimately, while the storage configuration is flexible and functional, the PCIe 3.0 x1 restrictions on both NVMe and SATA controllers present some limitations. For users needing high-speed NVMe storage, a motherboard with PCIe 3.0 x4 support per NVMe slot would be preferable, but for most NAS applications, the N355 provides good storage expandability at a reasonable price.

Interestingly, when I rand 100x 1GB File tests via terminal on each of the Gen 3×1 m.2 NVMe, the numbers were pretty good (factoring in the efficient class CPU and 1 lane of Gen 3 – so was never gonna exceed 800-900MB/s anyway).

Afterwards, I wanted to check if the PCIe slot was sharing lane space with the 2nd m.2 slot (as is the case on some of the N100/N305 NAS Moos before) and I am pleased to confirm that I was able to use terminal and 100x 1GB Read on both the 2nd M.2 NVMe slot AND another m.2 NVMe on a PCIe Card mounted on via the PCIe 3×4 slot.

So I am quite happy with the data/internal bandwidth in these tests with such a modest CPU. Let’s discuss this internal hardware and performance more.

CWWK N355 NAS Review – Tests & Performance

The Intel N355 CPU offers efficient performance for NAS-related tasks, including file sharing, virtualization, and media streaming. During testing, it handled multiple VMs running concurrently, with each assigned a virtual CPU and minimal RAM. Even under load, the CPU maintained stable performance without excessive heat generation, making it suitable for users who need a lightweight but capable processing unit for home lab applications.

Network performance was another highlight, with the dual 2.5GbE interfaces providing a combined throughput of up to 550MB/s in link aggregation mode. Real-world file transfers over SMB showed consistent multi-gigabit speeds, demonstrating the board’s ability to handle data-heavy operations effectively. However, users aiming for 10GbE connectivity will need to rely on the PCIe slot, which introduces some trade-offs in terms of expansion options.

In media applications, the N355 CPU managed simultaneous 1080p and 4K Plex streams, with CPU usage remaining under 60% during software transcoding. Native playback and direct-streaming performed significantly better, with no noticeable impact on system resources. While the board lacks dedicated hardware transcoding support, it remains a viable option for users relying on direct-play workflows.

Power efficiency remained a strong suit, with idle power consumption measuring around 9-10W with SSDs installed, increasing to 30-40W under load with multiple drives and VMs active. The low TDP ensures minimal heat output, but active cooling is still recommended for prolonged high workloads. Overall, performance results confirm that this board is well-optimized for NAS duties, though users with high-end processing needs may require a more powerful solution.

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CWWK N355 NAS MITX Board Review – Verdict & Conclusion

The CWWK N355 DIY NAS motherboard is an excellent choice for those seeking an affordable and feature-rich Mini-ITX solution for NAS applications. Its combination of dual 2.5GbE networking, six SATA ports, and two NVMe slots offers a strong foundation for storage and high-speed connectivity. Performance-wise, the N355 CPU handles virtualization and media streaming well, maintaining a low power draw while running multiple tasks efficiently. However, the limited PCIe lane allocation can restrict certain use cases, particularly when adding high-performance storage or networking upgrades. Despite these constraints, this motherboard delivers solid performance for users prioritizing a cost-effective and power-efficient NAS setup.

That being said, users should carefully consider their expansion needs before purchasing, as PCIe slot placement and bandwidth limitations may impact future upgrades. Additionally, the lack of ECC memory support may be a concern for enterprise-level deployments, though most home users and small-scale NAS setups will not be significantly affected. Ultimately, the CWWK N355 stands out as a capable and versatile board, offering good performance, reasonable expandability, and excellent value for money.

PROs of the CWWK N355 NAS MoBo

CONs of the CWWK N355 NAS MoBo

Compact Mini-ITX design, ideal for NAS builds Dual 2.5GbE ports for enhanced network performance Six SATA ports for ample storage expandability Two NVMe slots for high-speed SSD caching or storage Energy-efficient Intel N355 CPU with low power draw Good virtualization support for lightweight VMs and containers Strong media streaming performance, including Plex compatibility Affordable price point compared to similar NAS motherboards

PCIe slot placement may block SATA ports with larger cards Limited PCIe lanes constrain high-speed expansion options No ECC memory support, which may be a concern for some user

Where to Buy? CWWK N355 MITX NVMe NAS ($184-295 AliExpress) – HERE CWWK x86 P6 NVMe NAS Box ($160 AliExpress) – HERE DIY N355 NAS Products ($254-349 Amazon) – HERE

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