Will Nividias 3090 fit?

They fit after removing one of the drive cages

Will a NH-D15 fit in here?

No, the RM400 will only fit CPU coolers that are 148mm tall or less. At 160mm, the NH-D15 will not fit in any 4U server chassis. As an alternative, you can look into getting our KR02, which fits in the RM400: https://www.amazon.com/dp/B07S6CYK7Y

Can this fit an eatx dual socket motherboard?

There are several types of EATX motherboards, this case can fit up to SSI-CEB form factor motherboard (12-inch x 10.5-inch). But if your dual socketed motherboard is SSI-EEB (12-inch x 13-inch), then no, this case will not fit. For SSI-EEB form factor EATX board, please check out our RM42-502 instead (currently out of stock as of September 2, 2021 but more are coming in about a week): https://www.amazon.com/dp/B09227RQV2

How loud are the included case fans?

The noise at maximum speeds are 43.6 dBA and 33.7 dBA for the included 120mm and 80mm fans respectively, Below are additional specs. for the included fans: Dimensions: 120mm x 120mm x 25mm Voltage: 6.0V ~ 13.2V Rated current: 0.45A +/- 0.05A Speed: 2800 rpm +/- 10% Max. airflow: 108.76 CFM Air pressure: 5.63 mmH2O Max. noise: 43.6 dBA Dimensions: 80mm x 80mm x 25mm Voltage: 6.0V ~ 13.2V Rated current: 0.17A +/- 0.02A Speed: 3000 rpm +/- 10% Max. airflow: 43.05 CFM Air pressure: 4.18 mmH2O Noise: 33.7 dBA

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🚀 Power your professional edge with SilverStone’s RM400 – where performance meets precision.

ROBUST SECURITY - Front door with key lock ensures your critical drives and components stay protected.
OPTIMIZED COOLING - Includes dual PWM fans (120mm + 80mm) to maintain peak performance under heavy workloads.
HIGH SPEED CONNECTIVITY - Front USB 3.1 Gen1 ports deliver blazing 5Gbps data transfer speeds, future-proofing your setup.
EXPANDABLE STORAGE OPTIONS - Three 5.25" drive bays allow seamless integration of optical drives or hot-swap devices.
VERSATILE MOTHERBOARD COMPATIBILITY - Fits SSI-CEB, ATX, mATX, and mITX boards for ultimate build flexibility.

The SilverStone RM400 is a premium 4U rackmount server chassis designed for professionals and data center engineers. It supports a wide range of motherboard sizes including SSI-CEB, ATX, mATX, and mITX, and accommodates mini redundant power supplies up to 160mm deep. Featuring three 5.25" front bays, a secure front door lock, and USB 3.1 Gen1 front ports for ultra-fast connectivity, the RM400 combines flexibility, security, and efficient cooling with included PWM fans, making it an ideal choice for high-performance server builds.

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Number of USB 2.0 Ports	1
Number of USB 3.0 Ports	1
Brand	SilverStone
Series	RM400
Item model number	SST-RM400
Item Weight	23.8 pounds
Product Dimensions	16.93 x 17.56 x 6.93 inches
Item Dimensions LxWxH	16.93 x 17.56 x 6.93 inches
Color	grey
Manufacturer	SilverStone Technology
ASIN	B07MKSH1B8
Date First Available	December 1, 2018

SilverStone Technology 4U Rackmount Server Chassis with 3 X 5.25 Front Bays with CEB/ATX/mATX/Mitx Support RM400 Cases SST-RM400

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