---
product_id: 378534395
title: "SilverStone Technology 2U Rackmount Server Case with 4 X 3.5\" Hot Swap Bays Micro-Atx Support RM21-304"
brand: "silverstone"
price: "€ 6.24"
currency: EUR
in_stock: false
reviews_count: 5
url: https://www.desertcart.at/products/378534395-silverstone-technology-2u-rackmount-server-case-with-4-x-3
store_origin: AT
region: Austria
---

# 4 x 3.5" hot-swap drive bays Micro-ATX motherboard support Tool-less rail design SilverStone Technology 2U Rackmount Server Case with 4 X 3.5" Hot Swap Bays Micro-Atx Support RM21-304

**Brand:** silverstone
**Price:** € 6.24
**Availability:** ❌ Out of Stock

## Summary

> 🚀 Elevate your data game with SilverStone’s sleek, rack-ready powerhouse!

## Quick Answers

- **What is this?** SilverStone Technology 2U Rackmount Server Case with 4 X 3.5" Hot Swap Bays Micro-Atx Support RM21-304 by silverstone
- **How much does it cost?** € 6.24 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.at](https://www.desertcart.at/products/378534395-silverstone-technology-2u-rackmount-server-case-with-4-x-3)

## Best For

- silverstone enthusiasts

## Why This Product

- Trusted silverstone brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Compact Powerhouse Design:** Optimized for Micro-ATX boards, balancing space efficiency with robust server performance.
- • **Flexible PSU Compatibility:** Supports both standard and redundant 2U power supplies, ensuring uptime and power reliability.
- • **Tool-Free Rack Integration:** Install or remove the chassis quickly with ergonomic, tool-less rails—because your time is money.
- • **Effortless Hot-Swap Storage:** Seamlessly swap up to four 3.5" drives without downtime, perfect for dynamic data environments.
- • **Engineered for Cooling & Durability:** Precision fan assembly and sturdy build keep your drives cool and your data safe under pressure.

## Overview

The SilverStone RM21-304 is a 2U rackmount server chassis designed for professional storage solutions. It supports Micro-ATX motherboards and features four hot-swappable 3.5" drive bays compatible with 2.5" drives, tool-less rails for easy rack installation, and flexible mounts for standard or redundant 2U power supplies. Engineered for efficient cooling and durability, it’s ideal for data center engineers and professionals seeking a cost-effective, high-performance storage server case.

## Description

Silverstone's rm21-304 is a high performance storage Server Chassis designed for the professional storage environment. It is equipped with hard drive trays compatible with 2.5" Or 3.5" Drives and has fan Assembly with motherboard Support for up to Micro-ATX form factor. There are also flexible mounts to accommodate most 2U single/ 2U redundant server, PS2 (ATX) power supplies. Rm21-304 also has ergonomic, tool-less rail* designs for easy rack mount integration. With an overall package Designed for maximizing efficiency, flexibility, and durability, The rm21-304 is a great choice for professionals or data center engineers looking to build a storage Server.

Review: Pros: -Parts are meticulously organized: bags are labelled for every type of screw you'll need. -Fans are easily replaceable though it's a tight squeeze for standard width fans (25mm). -Fit my XFX 850w ATX power supply perfectly. -Good temps while drives are in use. -It's hard to tell from the photos, but it supports 2x2.5" internal drives (in addition to the hot swap bays). Cons: -An extra half inch of clearance between the fan mounts and the back plane would remove headaches for replacing the fans. Slim fans don't provide much static pressure. -Cable management can be a pain with long cables - get as short as your situation allows. I bought some extra molex cables to connect the back plane to the power supply less of a hassle. May not be necessary for others. The back plane uses 2x mini-sas SFF-8087 connectors. Don't buy breakout cables without realizing like I did. Impressed so far with performance as Unraid host. To buy an equivalent pre-built NAS solution, it would've easily run me 4-5 times as much as I spent for the entire setup + license.
Review: Great case to work with. Hot swap bays are excellent, although one was slightly mis aligned but easy fix with a flathead! Top is easy to remove for easy repairs. Option to have regular or hot swap PSU's is excellent!

## Features

- New production batch now available at
- https://www.desertcart.com/dp/B0B7KPWB31

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07LB74S6J |
| Brand Name | SilverStone |
| Colour | RM21-304 |
| Compatible Devices | Server |
| Customer Reviews | 4.0 4.0 out of 5 stars (44) |
| Enclosure Material | Metal |
| Global Trade Identification Number | 00844761014537 |
| Is Assembly Required | Yes |
| Manufacturer | SilverStone Technology |
| Manufacturer Part Number | SST-RM21-304 |
| Model Number | SST-RM21-304 |
| Mounting Type | Rack Mount |
| Size | 2U (88.9 mm height) |
| UPC | 844761014537 |

## Product Details

- **Brand:** SilverStone
- **Colour:** RM21-304
- **Compatible devices:** Server
- **Material:** Metal
- **Size:** 2U (88.9 mm height)

## Images

![SilverStone Technology 2U Rackmount Server Case with 4 X 3.5" Hot Swap Bays Micro-Atx Support RM21-304 - Image 1](https://m.media-amazon.com/images/I/61Eh4ET5a3L.jpg)
![SilverStone Technology 2U Rackmount Server Case with 4 X 3.5" Hot Swap Bays Micro-Atx Support RM21-304 - Image 2](https://m.media-amazon.com/images/I/61I9bzxVLQL.jpg)
![SilverStone Technology 2U Rackmount Server Case with 4 X 3.5" Hot Swap Bays Micro-Atx Support RM21-304 - Image 3](https://m.media-amazon.com/images/I/61UxT9MMtVL.jpg)
![SilverStone Technology 2U Rackmount Server Case with 4 X 3.5" Hot Swap Bays Micro-Atx Support RM21-304 - Image 4](https://m.media-amazon.com/images/I/61KHoEdKGZL.jpg)
![SilverStone Technology 2U Rackmount Server Case with 4 X 3.5" Hot Swap Bays Micro-Atx Support RM21-304 - Image 5](https://m.media-amazon.com/images/I/71HExtp17JL.jpg)

## Available Options

This product comes in different **Color** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by R***H on 25 March 2021*

Pros: -Parts are meticulously organized: bags are labelled for every type of screw you'll need. -Fans are easily replaceable though it's a tight squeeze for standard width fans (25mm). -Fit my XFX 850w ATX power supply perfectly. -Good temps while drives are in use. -It's hard to tell from the photos, but it supports 2x2.5" internal drives (in addition to the hot swap bays). Cons: -An extra half inch of clearance between the fan mounts and the back plane would remove headaches for replacing the fans. Slim fans don't provide much static pressure. -Cable management can be a pain with long cables - get as short as your situation allows. I bought some extra molex cables to connect the back plane to the power supply less of a hassle. May not be necessary for others. The back plane uses 2x mini-sas SFF-8087 connectors. Don't buy breakout cables without realizing like I did. Impressed so far with performance as Unraid host. To buy an equivalent pre-built NAS solution, it would've easily run me 4-5 times as much as I spent for the entire setup + license.

### ⭐⭐⭐⭐⭐ Review
*by A***N on 9 January 2021*

Great case to work with. Hot swap bays are excellent, although one was slightly mis aligned but easy fix with a flathead! Top is easy to remove for easy repairs. Option to have regular or hot swap PSU's is excellent!

### ⭐⭐⭐⭐⭐ Review
*by B***T on 9 October 2025*

Fans are loud, as expected in a server chassis. Build quality is great Super easy to build in SAS backplane + hotswap bays all work flawlessly Manages to fit my Noctua L9x65 CPU cooler Highly recommended to use a modular power supply as there is not room for any kind of cable management.

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---

*Product available on Desertcart Austria*
*Store origin: AT*
*Last updated: 2026-05-05*