Synology 8-Bay Short-Depth Rackmount NAS vs Synology 4-Bay 1U Rackmount NAS (2026): Key Differences
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This guide compares the synology 8 bay short depth rackmount NAS vs 4 bay 1u rackmount NAS to help you decide which fits your infrastructure. Both units are diskless, black, and designed for rackmount environments. They share a focus on high throughput for office-wide tasks. The main difference lies in capacity and form factor. The eight-bay model offers more drive slots and a specific short-depth design, while the four-bay unit provides a compact 1U profile with flexible expansion options.
Key differences
| Aspect | Synology 8-Bay Short-Depth Rackmount NAS | Synology 4-Bay 1U Rackmount NAS |
|---|---|---|
| Number of Bays | 8-Bay | 4-Bay |
| RAM Capacity | 4GB RAM | not listed |
| Form Factor | Short-Depth (298 mm depth for RS1221+) | 1U Rackmount |
| Network Ports | not listed | 4 x 1GbE RJ-45 |
| Expansion Slot | PCIe SFP+ or RJ-45 card support | PCIe 3.0 slot |
Which one should you choose?
Choose Synology 8-Bay Short-Depth Rackmount NAS if
- You need eight drive bays for high capacity storage without expanding the footprint.
- Your rack space has limited depth, requiring the short-depth design of the RS1221+.
- You want to configure two units for a Synology High Availability cluster for maximum uptime.
Choose Synology 4-Bay 1U Rackmount NAS if
- You require a standard 1U form factor for dense rack mounting.
- You need four built-in 1GbE ports for immediate network connectivity.
- You plan to scale capacity by connecting an RX426 Expansion Unit later.
Verdict: Choose the eight-bay short-depth model if you need maximum storage density in a shallow rack space or require high availability clustering. The four-bay 1U unit is better if you prefer a standard rack height, need multiple built-in Ethernet ports, or want to expand storage via an external expansion unit. Both deliver strong sequential throughput for shared file services.
8-Bay vs 4-Bay Rackmount NAS Specs
Drive Capacity
The Synology 8-Bay Short-Depth Rackmount NAS (RS1221+) offers eight drive bays, providing significant raw storage potential for large datasets or extensive media libraries. In contrast, the Synology 4-Bay 1U Rackmount NAS (RS826+) is configured with four bays, making it more compact for smaller deployments. If you require maximum local storage density without external enclosures, the eight-bay unit is the clear choice. However, the four-bay model allows for easier cable management and airflow in tighter rack spaces. You can expand the four-bay unit later using an expansion chassis, but the eight-bay version starts with double the drive slots.
RAM Capacity
Memory plays a critical role in handling concurrent connections and caching operations. The Synology 8-Bay Short-Depth Rackmount NAS includes 4GB of DDR4 RAM, which supports multi-user environments and virtual machine workloads. The specifications for the Synology 4-Bay 1U Rackmount NAS do not explicitly list its RAM capacity in the provided data. Generally, Synology units in this class often include similar base memory, but without confirmed data, you cannot verify if the RS826+ matches the RS1221+ in this regard. Adequate RAM ensures smooth performance when managing multiple users or running Docker containers simultaneously.
Physical Dimensions
Rack space is often at a premium. The Synology 4-Bay 1U Rackmount NAS is designed as a 1U unit, which is the standard height for rackmount servers, allowing you to stack more units vertically. The Synology 8-Bay Short-Depth Rackmount NAS has a height of 8.5 inches, which exceeds the 1U standard (approximately 1.75 inches). This makes the eight-bay unit a 2U or larger chassis, occupying more vertical rack units. If your rack has limited vertical space but deep shelves, the 1U model is more efficient. The eight-bay unit requires more vertical height but offers a shorter depth of 23 inches, fitting well in shallow racks.
Network Connectivity
Both units prioritize high-speed data transfer, but their built-in networking differs. The Synology 4-Bay 1U Rackmount NAS comes with four built-in 1GbE RJ-45 ports, offering flexibility for link aggregation or separate network segments. The Synology 8-Bay Short-Depth Rackmount NAS features a PCIe expansion slot, allowing you to add SFP+ or RJ-45 network cards for up to 5X network performance improvement. This means the eight-bay unit relies on optional cards for its highest speed capabilities, whereas the four-bay unit provides multiple standard ports out of the box. For immediate 1GbE connectivity, the four-bay model is more versatile.
Storage Features
The Synology 4-Bay 1U Rackmount NAS includes intelligent storage optimization features, such as automated storage tiering. This function moves infrequently accessed data to lower-cost cold tiers, preserving high-performance storage for active workloads. The specifications for the Synology 8-Bay Short-Depth Rackmount NAS do not mention this specific tiering feature. While both units likely run the same DSM software, the explicit mention of automated tiering in the four-bay model suggests it may be highlighted for this capability. If you are managing mixed workloads with varying access frequencies, this feature can help optimize performance and cost efficiency.
Which NAS fits your rack needs
Users needing high capacity in short depth
You should choose the RS1221+ if your rack has limited depth but requires maximum storage density. This unit features eight drive bays within a short 298 mm depth. It supports up to 2,315 MB/s read speeds. You can also configure two units for high availability. This makes it ideal for environments where space is tight but data volume is high.
Teams needing fast expansion and modern ports
The RS826+ offers four built-in 1GbE ports and a PCIe slot for 10GbE or NVMe upgrades. You can scale up to eight bays by adding an RX426 expansion unit. It delivers over 2,000 MB/s read throughput. Automated storage tiering helps manage active workloads efficiently. This model suits you if you need flexible networking and future-proof expansion options.
Buyers wanting long term hardware support
You should pick the RS826+ because it includes a three-year warranty. This provides longer hardware coverage compared to the RS1221+. Both units are diskless and rackmountable. However, the extended warranty period on the RS826+ offers better peace of mind for your infrastructure investment. It supports office-wide file sharing with solid sequential write speeds.
The products compared
Synology 8-Bay Short-Depth Rackmount NAS
Best for: High-capacity storage in tight rack spaces
- Drive Bays
- 8 Bay
- Included Storage
- Diskless
- RAM Capacity
- 4GB RAM
- Dimensions
- 23 × 16.5 × 8.5 inches
View on Amazon: Synology 8-Bay Short-Depth Rackmount NAS Affiliate link
The Synology RS1221+ offers eight drive bays in a compact 298 mm short-depth chassis. It includes 4GB of RAM and supports up to 2,315 MB/s read speeds. You can expand network performance by adding a PCIe SFP+ or RJ-45 card. This unit allows you to configure two units together for high availability clusters. It suits users needing high capacity in tight rack spaces.
Pros
- Eight drive bays for high storage density
- Short depth of 298 mm fits tight racks
- Supports up to 2,315 MB/s read speeds
- Expandable network via PCIe cards
Cons
- Diskless design requires separate drive purchases
- Only 4GB of RAM included
- Height of 8.5 inches exceeds standard 1U rack height
Good fit if
- You need eight drive bays in a short-depth chassis
- You plan to cluster units for high availability
- You require high read performance for multi-user environments
Skip if
- You need a standard 1U height unit
- You want pre-installed storage drives
- You require more than 4GB of RAM without upgrades
Verdict: Synology 8-Bay Short-Depth Rackmount NAS provides high capacity and performance in a compact form factor, making it ideal for users needing eight bays in tight spaces who can manage drive installation and RAM upgrades.
Synology 4-Bay 1U Rackmount NAS
Best for: Office file sharing with expandable storage
- Drive Bays
- 4-Bay
- Network Connectivity
- Four built-in 1GbE RJ-45 ports
- Included Storage
- Diskless
- Form Factor
- Rackmount
- Weight
- 19 pounds
View on Amazon: Synology 4-Bay 1U Rackmount NAS Affiliate link
The Synology RS826+ is a 4-bay 1U rackmount NAS designed for office environments. It delivers over 2,000 MB/s read speeds and includes four 1GbE ports. You can scale capacity by adding an RX426 expansion unit. The PCIe slot allows for 10GbE or NVMe upgrades. It suits teams needing reliable file sharing and backup with expandable storage options.
Pros
- Sequential read speeds exceed 2,000 MB/s
- Four built-in 1GbE RJ-45 ports
- PCIe 3.0 slot for 10GbE or NVMe upgrades
- Scales to 8 bays with RX426 expansion unit
Cons
- Diskless configuration requires separate drive purchases
- Limited to 4 internal drive bays
- Base networking capped at 1GbE speeds
Good fit if
- You need a compact 1U rackmount solution
- You require high sequential read throughput
- You plan to expand storage later
Skip if
- You need pre-installed drives
- You require 10GbE connectivity out of the box
- You need more than 4 drive bays
Verdict: Synology 4-Bay 1U Rackmount NAS fits offices needing high read speeds and expandable storage. It suits users who can add drives and network cards separately.
Specifications side by side
| Spec | Synology 8-Bay Short-Depth Rackmount NAS | Synology 4-Bay 1U Rackmount NAS |
|---|---|---|
| Drive Bays | 8 Bay | 4-Bay |
| Network Connectivity | not stated | Four built-in 1GbE RJ-45 ports |
| Included Storage | Diskless | Diskless |
| Form Factor | not stated | Rackmount |
| Number of Bays | 8-Bay | 4-Bay |
| RAM Capacity | 4GB RAM | not stated |
| Dimensions | 23 × 16.5 × 8.5 inches | not stated |
| Weight | not stated | 19 pounds |
| Size | RS1221+ | 22.44x21.26x7.09 in |
| Color | Black | Black |
| Model | RS1221+ | RS826+ |
Frequently asked questions
Which NAS has more drive bays?
The Synology 8-Bay Short-Depth Rackmount NAS (RS1221+) offers eight drive bays. The Synology 4-Bay 1U Rackmount NAS (RS826+) provides four bays. You get double the storage slots with the RS1221+. This allows for larger initial configurations or easier future expansion without needing additional enclosures.
What are the physical dimensions of the RS1221+?
The RS1221+ measures 16.5 inches in width, 8.5 inches in height, and 23 inches in length. These dimensions define its short-depth form factor. You can fit this unit into racks with limited depth while still accessing eight drive slots for your data storage needs.
How much RAM does the RS1221+ include?
The RS1221+ comes with 4GB of RAM installed. This memory supports basic NAS operations and multitasking. You may need to upgrade the RAM yourself for heavier workloads, as the base configuration is designed for standard storage and file sharing tasks in office environments.
Is the RS826+ a 1U rackmount unit?
Yes, the RS826+ is a 1U rackmount NAS. Its compact height allows it to fit standard 19-inch server racks. This form factor saves vertical rack space compared to taller units, making it suitable for offices where space efficiency is a priority for network infrastructure.
Can I add more storage to the RS826+?
The RS826+ supports expandable storage. You can add drives to its four bays to increase capacity. The guide notes it suits users who can add drives separately. This flexibility lets you start small and grow your storage pool as your office data requirements increase over time.
What is the main difference in capacity between these two models?
The primary difference is the number of drive bays. The RS1221+ has eight bays for high-capacity storage. The RS826+ has four bays for moderate storage needs. You choose the RS1221+ for maximum density in tight spaces. You choose the RS826+ for a smaller footprint with expandable options.