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Item#: N82E16811119279

Cooler Master N300 - Mid Tower Computer Case with Meshed Front Panel

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  • Polymer, mesh front bezel ATX Mid Tower
  • 1 x USB 3.0 / 2 x USB 2.0 / Audio Front Ports
  • 2 External 5.25" Drive Bays
  • 7 Internal 3.5" Drive Bays

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  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews
Cooler Master N300 Mid-Tower Case
The N300/N500 series cases join the existing N200, N400, and N600 to complete the N Series. They do so with a full array of exciting options that have been designed specifically with cooling performance in mind, especially liquid cooling. Their full mesh front panels and well-ventilated layout provide for a more abundant flow of air throughout the case. Fully embracing liquid cooling, N300 supports liquid cooling radiators up to 240mm.
Scalable Cooling
Supports a 240mm liquid cooling radiator or two 120mm fans on the right side.
High-End Hardware Support
Supports long graphics cards and tall CPU coolers.
Expansive Air Cooling
Includes two XtraFlo 120mm Fans, with support for up to eight fans.
Rich I/O Panel
The rich I/O panel allows easy access to two USB 3.0 port, two USB 2.0 ports and two Audio In and Out jacks (supports HD Audio).
Easy Maintenance Dust Filters
Dust filters provided at the Top, Right, Side Panel, and PSU intakes prevent dust buildup.
What's in the Box
  • N300 Case
  • Accessory Box
  • User Manual
N Series Comparison
    This Model      
masterlogo n200 n300 n400 n500 n600
  N200 N300 N400 N500 N600
Size Mini Mid Mid Mid Mid
Dimensions 7.95in. x 14.9in. x 17.5in.
(202mm x 378mm x 445mm)
7.5in. x 16.7in. x 19.3in.
(190mm x 426mm x 491.5mm)
7.5in. x 16.7in. x 19.7in.
(190mm x 426mm x 501.4mm)
7.8in. x 18.3in. x 18.9in.
(200mm x 450mm x 475mm)
8.1in. x 17.9in. x 18.9in.
(207mm x 455mm x 520mm)
Expansion Slots 4 7 7 7 7
5.25in. Bays
(Optical Drives)
(Max. length of
5.25in.: 6.7in. (170mm))
2 (exposed) 2 (exposed) 3 (exposed) 3 (exposed)
3.5in. Bays
(Hard Drives)
3 1 (exposed)
7 (hidden)
1 (exposed)
7 (hidden)
4 (hidden) 7 (hidden)
2.5in. Bays
(Hard Drives
or SSDs)
4 1 (hidden) 3 (hidden) 4 (hidden) 5 (hidden)
4 in SSD cage
1 behind MB tray)
Side Panel Window No Optional No Optional Window & Non-Window Available
All-In-One (AIO)
DIY Watercooling
Radiator Support
1 x 120mm
up to 1 x 240mm
Up to 2 x 240mm Up to 2 x 240mm Up to 2 x 240mm Up to 2 x 240mm
Maximum CPU
Cooler Height
w/o 120mm side panel fan:


with 120mm side panel fan:

Maximum Graphics
Card Length


Learn more about the Cooler Master NSE-300-KKN1

Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 1 year
  • Limited Warranty period (labor): 1 year
  • Read full details

Customer Reviews of the Cooler Master NSE-300-KKN1

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  • gino g.
  • 10/4/2014 2:28:22 PM
  • Ownership: 1 day to 1 week
  • Verified Owner

4 out of 5 eggsn300

Pros: comes with 2 fans, usb 3.0 and a bunch of screws
decent price
good airflow
liquid cooling placement options

Cons: cable management..maybe? wish it had a better way to run them thru but, havent really bought custom wires/cables of desired length so we'll see bout that..

Did you find this review helpful? Yes No

  • Daryl K.
  • 9/24/2014 4:57:25 PM
  • Ownership: 1 day to 1 week
  • Verified Owner

4 out of 5 eggsExcellent product

Pros: Plenty of cooling options, looks amazing, installation is simple. Very well designed case (with exceptions)

Cons: Support for 240mm radiator on side panel doesn't work if you have a long VGA card. Top 240mm radiator support doesn't work well since motherboard is mounted exactly at the top of the case. Must have VERY low clearance to fit radiator AND fans. If you are water cooling like me, check with the pics to make sure there is at least an inch of clearance above the back plate of the motherboard at the top of the case.

Other Thoughts: Will have to do some modding to make it work, but I like a challenge, so not a big deal.

Sometimes wonder if case manufacturers actually put computers in their own cases before marketing them. :/

Did you find this review helpful? Yes No

  • David C.
  • 8/19/2014 7:05:12 AM
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsnice!

Pros: It's been years since I built a PC, back in the Pentium 4 days. Decided to build my own again, and saw this case with their GXII power supply as a bundle. Everything bolted in nicely with wiggle room. Front panel works with the ASUS M5A97 Mobo, and wow - a pair of 120mm fans! Couple that with the 120 mm fan in the PS and it's decently quiet. Like the quick secure hard drive clips - sure beats the screws from back in the day!

Cons: none.

Other Thoughts: I like the all black case - very unassuming; not a con for me. However, those looking for bling/flash would probably want to look elsewhere.

Did you find this review helpful? Yes No

  • Lincoln H.
  • 8/18/2014 8:08:25 AM
  • Ownership: 1 day to 1 week
  • Verified Owner

4 out of 5 eggsGood value and brand

Pros: Cooler Master is a brand I can rely on and use it when I can due to this fact. Good price/performance crossing point. Never had a issue with cases or power supplies. (all PS fail after a while. But warranty is good on these. Why buy a no name brand with no warranty?

Cons: none

Did you find this review helpful? Yes No

  • Robert C.
  • 7/11/2014 12:28:14 PM
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsall I ever use

Pros: well built, good looking and cheap

Cons: none

Other Thoughts: I been building systems with this brand case for the last 5 or 6 years, always a good product

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  • Alex F.
  • 2/2/2014 7:53:53 PM
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsGreat Case for the Price and AWESOME SUPPORT!

Pros: Great case, easy to work on. Awesome support from Cooler Master as well for a relatively small issue. The case comes with 2 SickleFlow 120 fans. Upon receiving the case, the front fan developed a slight rattle. I contacted Cooler Master and after giving them my info they say they would send a new fan right away. A few hours later, I received a personal call from Patrick J, my support rep. He informed me that they were out of stock of the fan and that to make things right, they were going to send me 2 (not just the one that was broken) new JetFlo 120 fans. Awesome customer service and support by both Patrick and Cooler Master. This was a really minor issue of a $10-$15 fan but they treated me as if I was a top customer.

Cons: The fan that rattled when I received it but I can't call it a con after the support I received to fix the issue

Other Thoughts: Awesome support from Cooler Master!

1 out of 1 people found this review helpful. Did you? Yes No

4 out of 5 eggsAnother solid Cooler Master Case

Pros: Lightweight considering size
Ample interior room
Good Cooling capabilities
Lots of room for Hard Drives
Supports 240mm AIO water coolers
CPU tray cutout is large for easy CPU cooler access
USB 3.0 ports up front

Cons: Metal used is thin
Included fans are a little noisy
Limited options for clean wiring
Only one standard SSD mounting position
Not all intake positions have dust filters

Other Thoughts: The CoolerMaster N300 is a solid good looking case. It offers excellent cooling opportunities allowing for many AIO water Cooling options. It comes with one intake and one exhaust fan, but can accommodate several more if needed. Since this build was for my Amahi server I just added an additional intake fan to blow across my 6 hard drives.

The case was pretty easy to work with. Bottom mount PSU position is great and the intake for it has a dust filter. The Motherboard tray has a large opening in the back in case you use a higher end cooler and need access to the back side of the mobo. USB 3.0 ports up front are nice to have.

The included fans are a little audible with a slight hum. Nothing bad, just can notice it compared to my dead silent LEPA fans.

The case materials are a bit thin, so denting them could be a concern as it seems like it would not take much to crease it. However, thus far I have had no such issues and the frame appears solid and strong.

I like the fact that the case can accommodate several hard drives, although I wish it had more than one 2.5" drive mounting position as SSD's are becoming more relevant.

Hiding wiring is a concern as there are few options for cable routing. Using a modular PSU would help here.

For $50 the N300 is a good case. It is not perfect, but offers enough positives to overlook some of it's cost cutting measures.

1 out of 1 people found this review helpful. Did you? Yes No

  • Nicolas D.
  • 1/15/2014 10:27:53 AM
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsSleek

Pros: - Esthetically beautiful.
- 1 USB 3.0.
- Can fit a dual 120mm radiator, in two spots.
- Comes with 2 case fans, easily expected from Cooler Master.
- Lots of 120mm fan options including 140mm for optimized air flow.

Cons: Maybe cable management would be a pain for first time builders.

Other Thoughts: Some reviewers say this case is mediocre. Not me.

Did you find this review helpful? Yes No

  • Thomas F.
  • 12/30/2013 6:53:16 AM
  • Ownership: 1 month to 1 year
  • Verified Owner

4 out of 5 eggsUpdated Review

Pros: After Actually Finishing A Build In The Case & Testing Extensively It is more solid after everything is buttoned up.

Cons: The SSD issue can be fixed with a 3.5 inch Adapter.

Other Thoughts: None

Did you find this review helpful? Yes No

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Item#: N82E16811119279
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