Would a 3x5.25" to 1x120mm fan adapter work in this case to allow 2x120mm intakes on the front, one on either side?

This Chenbro case comes with a 120mm fan mounted on a removable enclosure on the left side. It may be possible to purchase that same fan and enclosure and mount it on the right side - in place of the hard drives. This particular case also has two 120mm fans mounted on the inside of the top lid - facing downward. I ordered this case by mistake and ended up ordering another Chenbro case. This one features 8 slots and the one I needed features 7 slots. This one - with 8 slots would not accommodate the dual redundant Chembro 820w power supplies (model 5820) that I needed to install.

Is this compatible with Micro atx and ATX?

Yes very much so. thought it will looked VERY tiny in this case. I currently use an EATX board and its looks so small in this chassis.

I'm having a hard time finding 4U power supplies. Am I correct in saying this case must take regular PC type PSUs?

It just takes a regular ATX PSU.

Specs list 3x 120mm fans. if mounts are available, where are they? and will they accommodate a radiator for water cooling?

There is one mounted in the left side of the front of the case and the other two are mounted vertically about mid-case on the top up against the vent you can see in the picture. I had to remove them to install a graphics adapter. You could probably get a radiator in there if you didn't need a graphics card, or other large expansion card.

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Main image of CHENBRO RM41300-FS81 Black Steel / Plastic 4U Rackmount Server Case for Tesla GPU 3 External 5.25" Drive Bays

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CHENBRO RM41300-FS81 Black Steel / Plastic 4U Rackmount Server Case for Tesla GPU 3 External 5.25" Drive Bays

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3 External 5.25" Drive Bays
Rear: 2 x 80 mm (Option) 80mm Fans Front: 1 x 120 mm (120 x 25 mm), PWM 120mm Fans

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RM41300-FS81

4U High-Performance Industrial Server Chassis

A solidly-built server case, the CHENBRO RM41300-FS81 is ready to house four Tesla GPU cards along with multiple 3.5" & 5.25" drives. The whole system will stay cool for stable performance thanks to five pre-installed case fans.

Supports 8-slot rear window for four GPU cards
Truly isolated anti-vibration design on internal HDD and drive cages
Front door lock prevents tampering and unauthorized access
Pre-installed two 80mm fans and three 120mm fans for efficient cooling

Model
Brand	CHENBRO
Model	RM41300-FS81

Details
Chassis Type	Rackmount
Form Factor	4U
Color	Black
Case Material	Steel / Plastic
Motherboard Compatibility	EEB (12"x13")

Expansion
External 5.25" Drive Bays	3
External 3.5" Drive Bays	1
Internal 3.5" Drive Bays	4
Expansion Slots	8
External Slim Drive Bays	1

Ports
Front Ports	2 x USB 2.0

Cooling System
80mm Fans	Rear: 2 x 80 mm (Option)
120mm Fans	Front: 1 x 120 mm (120 x 25 mm), PWM

Features
Features	RM41300 for Tesla GPU Support 4 x Tesla GPU cards Support Intel / AMD up Quad

Dimensions & Weight
Dimensions	21.5" x 16.9" x 6.9"

Additional Information
First Listed on Newegg	June 13, 2013

Warranty & Returns

Warranty, Returns, And Additional Information

Return Policies

We want to ensure your holiday shopping this year is hassle-free. That’s why we’re automatically extending our return policies on almost every product! For purchases placed between November 1st, 2026 and December 31, 2026 you will have until January 31, 2027 to return your product.

Return for refund until: January 31, 2027
Return for replacement until: January 31, 2027
This item is covered by Newegg.com's Extended Holiday Return Policy.
Read full return policy for details.

CHENBRO RM41300-FS81 Black Steel / Plastic 4U Rackmount Server Case for Tesla GPU 3 External 5.25" Drive Bays

RM41300-FS81

4U High-Performance Industrial Server Chassis

Learn more about the Chenbro RM41300-FS81

Customer Reviews of the Chenbro RM41300-FS81

Warranty & Returns

Warranty, Returns, And Additional Information

Return Policies

Manufacturer Contact Info

Item#: N82E16811123178

CHENBRO RM41300-FS81 Black Steel / Plastic 4U Rackmount Server Case for Tesla GPU 3 External 5.25" Drive Bays

RM41300-FS81

4U High-Performance Industrial Server Chassis

Learn more about the Chenbro RM41300-FS81

Customer Reviews of the Chenbro RM41300-FS81

Warranty & Returns

Warranty, Returns, And Additional Information

Return Policies

Manufacturer Contact Info