Cooler Master Masterbox MB520 RGB Review


Lately, you’ll notice that the market for budget chassis is soaring. And with more people getting into and enjoying PC gaming, as well as looking to build their own system, a lot of individuals are in need of a chassis.

Of course, each one of us wants to get our hands on the flagship chassis that is out and available in the market. But then we’ll realize that not everyone can really afford these since they can get quite pricey. Though the Cooler Master Masterbox MB520 RGB is one of the more cost-efficient options in the market, it also makes for a great chassis for those on a tighter budget who wants something cool and efficient.

With its non-tempered glass windowed side-panel combined with a distinct front panel design, the Cooler Master Masterbox MB520 RGB is aiming to stand out from the crowd. It also has enough room for a good amount of hardware which is convenient for all.

So with that, let’s go and learn more about this product from Cooler Master and have a closer look at it.

Cooler Master Masterbox MB520 RGB Review – What’s in the Box?

The Masterbox MB520 RGB that arrived, came in a big, standard, simple-looking cardboard box that was quite sturdy. It came to us undamaged which was really good because you know that Cooler Master guaranteed that the product will arrive to you safely and in tact.

You won’t see much on the box since the front part only sports an illustration of the chassis. The company’s name can be found on the upper left corner, and the name of the product on the lower right.

When you turn the box, you will see that the back part shows the name Masterbox MB520 RGB again. Aside from this, you will find other important details about the product written in different languages to help other customers understand what the Cooler Master Masterbox MB520 RGB has to offer.

Once done checking out the box’s exterior, you can go ahead and check out what’s inside the package. Here, you’ll notice that there aren’t any surprises offered: just the Masterbox MB520 RGB fixed in a plastic bag that is set in between two customized and formed foam bricks. This is to prevent the chassis from moving about in the package while in transit. Overall, it’s a pretty standard yet highly effective manner of packaging and shipping the PC case safely to the buyer.

Once you get the Cooler Master Masterbox MB520 RGB out of the box, you’ll have a better look at the PC case that you’ll be working with. All the gleaming and glossy surfaces are protected and kept safe with plastic. This is to prevent any smudging and scratches from appearing on the chassis. And since we received our PC case without any dents, scratches, or dings, we can definitely say that the company gave their packaging extra throught, and was overall effective.

The Product

Cooler Master Masterbox MB520 RGB Review

Like us, the first thing that will probably catch your attention is the side panel window of the MB520. It is a huge sheet of perspex which is okay; but considering that tempered glass is a standard on PC cases of this price range, it’s quite a surprise to see that Cooler Master took this path. But despite their choice of materials, the Masterbox MB520 RGB’s edge to edge window looks excellent, and its dark tint adds more aesthetics to the product as well.

But what really stands out is the rich and vibrant colored red trim on the sides and at the top of the front panel. It is a design that the company somewhat borrowed from their premium MasterCase collection; and the good thing is that it works perfectly for the Masterbox MB520 RGB. Its side-mounted ventilation provides added airflow while also maintaining the front portion of the PC case looking good and less cluttered.

For the front panel, it makes use of a shiny, translucent black plastic that gives it its nice mirror-like quality. Though if you have a couple of LED fans installed, they’ll light up really good. Just remember that since there’s a lot of plastic going on with the Masterbox MB520 RGB, it’ll be a dust magnet, so you’ll really need to keep a piece of cloth handy.

On the right portion of the PC case, you will find a solid and sturdy black panel. It isn’t anything fancy or very eye-catching, but it does get the job done well which is what matters. Not only that, but you will also notice more red flairs located on the front panel as well. Again, the Masterbox MB520 RGB is an affordable PC case, so it’s just common for everyone to not expect anything too outlandish or lavish when it comes to its features.

At the back, everything there is something that you’d expect from a PC case, though we’re really surprised to see something like a height adjustable fan mount since these make AIO cooler installations easier. In addition, Cooler Master also utilized a reusable expansion slot cover instead of the usual snap-offs that we usually see in PC cases that are in this price range.

At the top of the chassis, there’s another bonus for us which is actually a big magnetic dust filter. Behind, you will find support for 120 / 140 millimeter fans, as well as similarly-sized radiators; thing is, you should first check out the internal clearances there.

Interior of the Cooler Master Masterbox MB520 RGB

The mounts on the side panel make use of four thumbscrews just like with every other panels made from tempered glass. When you remove this, you will have enough access to the chassis’ interior, making the installation process easier and better. There’s also a ton of length to the PC case as well, meaning, it has outstanding clearance for bigger coolers and expansion cards in the front panel. You will find cable routing holes and even big cut-outs for mounting a CPU cooler from the back of the motherboard which is pretty neat.

At the bottom, you will see a full-sized integrated PSU shroud. It comes with a vertical GPU cable route with a grommet, a PSU ventilation, as well as a cutaway in front for mounting radiators that are thicker than usual. What we’re happy about with the Masterbox MB520 RGB is the presence of the vertical routing hole since it’s great for GPU power cables.

On the rear portion, there are a total of seven expansion slots wherein each of these have reusable ventilated covers. You’ll also get to mount two additional SSDs at the back of the motherboard which screws in from this particular side. We suggest that you fit these first before adding them to the motherboard. Also, there’s a pre-installed fan at the back part which is great for the exhaust. When it comes to the fans, it is quite interesting that there aren’t any in the front part; it’s a bit of a pain for some, but if you’re someone who wants to install, let’s say, a 360 millimeter AIO for your computer, you can just mount it in front, and you’re all set.

Its huge cutout is great since it means that the entire length of the front panel can be utilized for radiators that are thicker than your standard ones. At the back of the motherboard tray, there is an ample number of cable routing space; also, there are tons of cable tie loops, and if those aren’t enough, then you can cram your additional cables right under the PSU shroud which, we think is really convenient.

Product Features

Dark Mirror Front Panel

The Masterbox MB520 RGB features a tinted transparent front panel. It provides you with a nice aesthetic look to this PC case.

Top-Notch Thermal Performance

Due to large intakes of air on each of the front panel’s side, the airflow in the chassis is optimized. With additional ventilation on the top panel, thermal support is improved since it allows for easy breathing of  the system.

LED Fans with RGB Effects and Lighting Control

This chassis features three preinstalled RGB LED front fans measuring 120 millimeters which create a stunning lighting effect. In the accessory pack, you will find one RGB controller; and if your motherboard does not support this function, you can link the reset button and manage the RGB lighting right from the I/O panel.

Tempered Glass Side Panel from Edge to Edge

Showcase your rig and system’s RGB lighting through the chassis’ side panel. This is made of tempered glass and has a thickness of 4 millimeters. The bracket of the side panel hinges on a certain angle when being removed, while two screws are held in place with rubber so these do not get replaced.

Greater Possibilities

For your gaming needs, the Cooler Master Masterbox MB520 supports all standard motherboards that are available today.

GFX Cable Routing

This allows for convenient routing of the graphics card cables via the PSU shroud grommet.

Clearance of Main Components

The MB520 RGB chassis supports graphics cards measuring 410 millimeters loong, CPU coolers with a maximum height of 165 millimeters, and power supplies with a length of up to 180 millimeters.


The Masterbox MB520 RGB from Cooler Master has dimensions of 496 x 218 x 468 millimeters (L x W x H) and comes with 7 expansions slots and two 2.5 / 3.5-inch drive bay combos. There are a total of 4 SSD drive bays, plus an I/O panel that has two USB 3.0’s, and an Audio In-Out that supports all HD audio. For the motherboard, it supports ATX, Mini ITX, and Micro ATX.

When it comes to its pre-installed fans, the Cooler Master Masterbox MB520 RGB has three 120 millimeter RGB fans in front and one 120 millimeter black fan on its rear. The PC case also has a 165 millimeter clearance CPU cooler, a clearance GPU that is 410 millimeters, and clearance PSU that’s 180 millimeters.

The company has conveniently allowed for cable routing behind the chassis’ motherboard tray which is about 19 to 27 millimeters.

Using the Product

The Cooler Master Masterbox MB520 RGB’s function is the case’s strong point, and it’s definitely something that won’t limit you in your customizations. For any standard gaming build, you will definitely be set on this PC case.

There are a ton of storage options available, and its size makes it really easy for you, and everyone else, to install extended motherboards, or even huge graphics cards. Despite this, there is still a whole lot of room for customized liquid cooling systems; so if this is your option, then it’s definitely possible with the Masterbox MB520 RGB which is really cool.

Overall, the Cooler Master Masterbox MB520 RGB has a ton of potential to provide you with a good amount of cooling. All in all, we’re giving this PC case a thumbs up for its build and efficiency.


The Cooler Master Masterbox MB520 comes with a lot of amazing features that made the chassis more fun and exciting to use. Aside from the aesthetic appeal that it offers, the case is also nice and durable, which is something expected from a Cooler Master product.

Another thing we really appreciate is that hardware installation was simple and cable management was extremely easy. In fact, we were able to complete this task in just a few minutes which is great, especially for PC builder newbies.

When it comes to the wires, there are a lot of areas where these can be hidden and tied, to keep the interior of the case neat. Since all the storage are located at the back of the PSU isolation shroud, the messy cables aren’t visible from the motherboard’s side.

All in all, we think that the Cooler Master Masterbox MB520 RGB is worth the price so we definitely recommend this. It comes with a lot of features and it’s one of the best chassis in its price range.

Where to Buy

You can purchase the Cooler Master Masterbox MB520 RGB from the company’s website. You can also check out Cool Master’s store locator to find shop that sells this product in your location.