{"product_id":"silverstone-rm400-4u-rackmount-server-chassis-flexible-server-build","title":"SilverStone RM400 4U Rackmount Server Chassis - Flexible Server Build","description":"\u003cp\u003eOur review of the SilverStone RM400 finds it is a practical, no-frills 4U rackmount chassis for professionals who need a roomy, secure case for server or workstation builds. The single biggest reason to buy is its support for large motherboard form factors up to \u003cstrong\u003eSSI-CEB\u003c\/strong\u003e and accommodation for standard ATX or Mini redundant power supplies, which gives builders flexibility for dense, rack-oriented systems. The RM400 is clearly aimed at engineers and small data center teams who prioritize space, drive bay flexibility, and a simple front lock over aesthetic extras.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSSI-CEB and ATX support:\u003c\/strong\u003e Accepts large server-class motherboards and standard ATX boards so you can choose a high-performance platform.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThree 5.25 in drive bays:\u003c\/strong\u003e Provides flexible installation for optical drives, hot-swap bays, or front-mounted controllers when serviceability matters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRedundant power supply compatibility:\u003c\/strong\u003e Fits ATX (PS2) or Mini redundant power supplies up to 160mm deep to support resilient power configurations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFront USB 3.1 Gen1 ports:\u003c\/strong\u003e Includes 5Gbps USB connectivity that is backward compatible with USB 2.0\/1.1 for fast external transfer and tool-less setup convenience.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded cooling:\u003c\/strong\u003e Ships with one 120mm and one 80mm PWM fan to provide baseline airflow for server components out of the box.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe RM400 is best for IT professionals, lab technicians, and small data center operators who need a durable 4U chassis that supports larger server motherboards like \u003cstrong\u003eSSI-CEB\u003c\/strong\u003e and offers flexible drive bay options. Its front door with key lock and room for redundant power supplies appeal to environments that require controlled access and uptime.\u003c\/p\u003e\n\u003cp\u003eThose who should look elsewhere include users seeking silent consumer desktop cases, compact home lab builds that must fit into shallow racks, or buyers wanting built-in advanced cable management and aesthetic accents; the RM400 is functional rather than decorative.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRoomy interior that accommodates \u003cstrong\u003elarge ATX and SSI-CEB motherboards\u003c\/strong\u003e and multiple PCIe slots for expandability.\u003c\/li\u003e\n\u003cli\u003eThree front 5.25 in bays give clear options for drives or front-panel devices when serviceability matters.\u003c\/li\u003e\n\u003cli\u003eDurable construction with a front door key lock improves physical security in shared rack environments.\u003c\/li\u003e\n\u003cli\u003eFront USB 3.1 Gen1 ports provide modern connectivity while remaining backward compatible.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSome users report mixed installation experience with ATX motherboards, and noise levels vary depending on fan setup and components.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eForm factor support\u003c\/td\u003e\n\u003ctd\u003eSSI-CEB \/ ATX \/ mATX \/ mITX\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDrive bays\u003c\/td\u003e\n\u003ctd\u003e3 x 5.25 in front bays\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower supply\u003c\/td\u003e\n\u003ctd\u003eATX (PS2) \/ Mini redundant up to 160mm deep\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExpansion slots\u003c\/td\u003e\n\u003ctd\u003eStandard profile PCI \/ PCIe x7 slots\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFront I\/O\u003c\/td\u003e\n\u003ctd\u003eUSB 3.1 Gen1 (5Gbps), backward compatible with USB 2.0\/1.1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCooling included\u003c\/td\u003e\n\u003ctd\u003eOne 120mm PWM fan and one 80mm PWM fan\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe SilverStone RM400 is a solid, value-oriented 4U rackmount chassis for professionals who need flexibility for large motherboards, multiple front 5.25 in devices, and redundant power options. It is good value for engineers and small data centers that prioritize expandability and security over visual design.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it support redundant power supplies?\u003c\/strong\u003e\u003cbr\u003eYes. The RM400 supports ATX (PS2) and Mini redundant power supplies up to 160mm deep.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat motherboard sizes fit this chassis?\u003c\/strong\u003e\u003cbr\u003eThe case accepts SSI-CEB, ATX, mATX, and mITX motherboard form factors.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre USB 3.1 ports available on the front?\u003c\/strong\u003e\u003cbr\u003eYes. Front I\/O includes USB 3.1 Gen1 ports at 5Gbps that are backward compatible with USB 2.0 and 1.1.\u003c\/p\u003e","brand":"SilverStone","offers":[{"title":"Default Title","offer_id":48637304471771,"sku":"B07MKSH1B8","price":241.15,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/61mqFwrQXqL._AC_SL1500.jpg?v=1778590538","url":"https:\/\/gearmusthave.com\/products\/silverstone-rm400-4u-rackmount-server-chassis-flexible-server-build","provider":"GearMustHave","version":"1.0","type":"link"}