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Cooler Master MasterBox MB520 ARGB ATX Mid-Tower with ARGB Lighting System, 3x 120mm ARGB Fans, Tempered Glass, Front DarkMirror Panel with Mesh Side Intakes, MCB-B520-KGNN-RGA

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  • DarkMirror Front Panel: Shade light through the DarkMirror front panel for a sharper contrast of the ARGB fans.
  • Mesh Intakes: Large, mesh intakes span each side of the front panel to provide additional airflow to system.
  • ARGB Lighting System: Three pre-installed ARGB fans can be managed by either the motherboard or an included controller, connected by the included splitter, to create a comprehensive ARGB lighting system.
  • Tempered Glass Side Panel: Hardware, custom-loop cooling, and the pure pride of the builder is shown in panoramic view through an edge-to-edge tempered glass side panel.
  • Optimized Airflow: Filtered ventilation on the top panel provides additional thermal support while also offering mounting options for future cooling upgrades.

  • Overview
  • Specs
  • Warranty & Returns
  • Reviews
Cool As Good As It Looks
Cooler Master MasterBox MB520 RGB
Light 'em up.

With a transparent front panel, three front RGB fans, and an edge-to-edge tempered glass panel, the MasterBox MB520 RGB is a stylish, modern case for your build. Besides the stunning look, this mid tower case also accommodates oversized components, features bottom shroud to conceal PSU and cables, and has ample space behind motherboard tray to route and organize cables. With a budget-friendly price, the MasterBox MB520 RGB is a great choice for your rigs.

DarkMirror Front Panel

Shade light through a transparent, tinted front panel.

Performance Intake

Large intakes on each side of the front panel let the system breathe easy.

RGB LED Fans and Lighting Control

Three 120mm RGB LED fans in front are pre-installed to create an amazing lighting effect.

One RGB controller is included in the accessory pack. If your motherboard does not support the RGB control function, you can connect the RESET button and control the RGB lighting directly from the I/O panel.

Excellent Thermal Performance

Optimized airflow due to the large intakes on each side of the front panel.

Additional ventilation on the top panel adds thermal support.

Fan and Radiator Support

Front: Three 120mm or two 140mm fans and up to a 360mm radiator with a maximum thickness of 50mm without fans.

Top: Two 120mm or two 140mm fans and supports a 120mm or a 240mm radiator.

Rear: One 120mm fan or radiator. All to ensure you don’t have to compromise on performance.

Edge-To-Edge Tempered Glass Side Panel

Showcase your build and system lighting effect through the 4mm-thick tempered glass side panel. The side panel bracket hinges on an angle during removal, while two "captive" screws are held in place with rubber so they are not misplaced.

GFX Cable Routing

Conveniently route the graphics card cable through the PSU shroud grommet.


Learn more about the Cooler Master MCB-B520-KGNN-RGA

Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 1 year
  • Limited Warranty period (labor): 1 year
  • Read full details
  • Return Policies
    • Return for refund within: 30 days
    • Return for replacement within: 30 days
  • This item is covered by Newegg.com's Standard Return Policy.
Ownership: 1 week to 1 month
Verified Owner
5/ 5
Great case for you $$ 9/24/2020 4:51:15 AM

Pros: Super easy

Overall Review: Great case that won't hurt your budget

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Ownership: 1 week to 1 month
Verified Owner
5/ 5
good 9/21/2020 1:53:45 PM

Overall Review: good

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Anonymous
Ownership: 1 week to 1 month
Verified Owner
5/ 5
Extremely comfortable case to use for a build. 9/17/2020 8:56:00 AM

Overall Review: excelente case for many setups

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Anonymous
Ownership: 1 month to 1 year
Verified Owner
5/ 5
Great Case 9/16/2020 10:00:30 AM

Pros: Front mesh panel
3 RGB fans included
All 3 fans go to 1 cable

Cons: On the side panel (Not the temperd glass one) the thing you grab to pull it off had a dent in it but its okay because i cant see it.

Overall Review: AWESOME case for the price just came damaged.

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Ownership: 1 week to 1 month
Verified Owner
5/ 5
One of the best cases on the market. 9/14/2020 9:06:10 AM

Pros: - High air flow.
- Supports up to a 360mm AIO.
- Great RGB lighting.
- Plenty of room inside for various designs.
- Cable management was very nice.

Cons: - No grommets for cable management, but knew before purchase. You can probably get aftermarkets. No complaints.
- Limited HDD trays. Though I use only 1 of them. No eggs off.
- Might not be space friendly with PSUs larger than 1000w (with the longer designs). Most 850w or smaller fits fine.

Overall Review: This is probably one of the best mid-tower ATX cases on the market. It has some of the best airflow to keep components cool and has no issues getting air in.

Doesn't come with any filters for the fans, but you can always get aftermarket filters here on Newegg and install them. I highly recommend this for the front panels if you have a heavy dust environment.

The case supports up to a 360mm radiator so getting good thermals for an AIO or even an air cooler will be very easy. The high air intake means more fresh air for components and less hot air staying in the case.

Overall there is NOTHING to hate or dislike about this case. I love it.

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Anonymous
Ownership: 1 week to 1 month
Verified Owner
5/ 5
Looks great 9/12/2020 6:22:29 PM

Pros: -ARGB fans
-looks great
-Power supply shroud helps with cable management

Cons: -I though the ARGB option came with an output fan, but it doesn’t. Apparently, only the RGB option does.
-A bit tight for higher end air cooling options (ended up downgrading a bit)
-Sometimes cable management is a bit tight

Overall Review: Amazing case, looks cunning, ARGB is awesome, front mesh looks cool, you will probably need an output fan if you took the ARGB option

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Anonymous
Ownership: 1 week to 1 month
Verified Owner
5/ 5
Great Case! 9/12/2020 9:08:26 AM

Overall Review: Great space inside and good for cable management

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Ownership: 1 month to 1 year
Verified Owner
5/ 5
A great case with great airflow. 9/10/2020 5:53:38 PM

Pros: Tempered glass side panel

Overall Review: You really can’t go wrong with this case. It looks great loaded with RGB or without.

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    Ships from China.
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