How many drive bays does this case provide for 5.25-inch and 3.5-inch drives?

It has 3 external 5.25-inch drive bays and 8 internal 3.5-inch drive bays.

What type of power supply does the SilverStone SST-RM400 support, and how deep can it be?

It supports PS2 / ATX / Mini Redundant power supplies, with support for units up to 160 mm deep.

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Specs

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Model
Brand	SilverStone
Model	SST-RM400

Details
Case Material	SGCC
With Power Supply	No
Power Supply	PS2 / ATX / Mini Redundant (supports up to 160mm)
PSU Mount	Rear
Motherboard Compatibility	CEB / Micro ATX / ATX / Mini-ITX

Expansion
External 5.25" Drive Bays	3
Internal 3.5" Drive Bays	8
Internal 2.5" Drive Bays	2 x 2.5” (up to 15mm) 1 x 2.5” (up to 15mm) or slim optical (12.7mm)
Expansion Slots	Standard profile PCI / PCIe x 7

Front Panel Ports
Front Ports	2 x USB 3.1 Gen1 Type-A

Cooling System
Fan Options	Front: 1 x 80mm fan or 1 x 120mm fan (1 x 120mm fan included) Rear: 2 x 80mm fan (one fan included)

Dimensions & Weight
Max GPU Length	Compatible up to 8.6" (220mm) in length, width restriction - 4.2" (106mm) Compatible up to 13.3" (339mm) in length, width restriction - 4.2" (106mm) with no drives in 3.5" drive cage
Max CPU Cooler Height	130 mm
Dimensions	6.93" x 16.93" x 17.56"
Weight	23.81 lbs.

Additional Info
Features	Supports up to SSI-CEB motherboard Supports ATX (PS2)/Mini redundant power supply up to 160mm deep Supports Standard profile PCI / PCIe x 7 slots Front door with key lock for extra security Three 5.25" drive bays for flexible 5.25" device installation 5Gbps Super Speed USB 3.1 Gen 1 interface, backward compatible with USB 2.0 / 1.1 Mounting holes ready for quick rail slide installation (rail slide sold separately)

Additional Information
First Listed on Newegg	October 10, 2026