The interior of the MasterCase Pro 6 is divided into two chambers. The bottom chamber is where the PSU mounts, and it also holds a removable tray that can hold two 2.5” or 3.5” drives. Cooler Master recommends that PSU length not exceed 7.9”, or 200 mm. The bottom drive tray can be repositioned or removed by loosening three thumbscrews.
The divider between the top and bottom chambers has two grommeted cable holes for clean cable management. Two metal trays for SSDs mount to this divider in the main chamber, and they can be moved to the back of the motherboard tray, as well. The main chamber provides another three 2.5” or 3.5” drive bays through tool-free sleds mounted in a dedicated cage.
Both the 5.25” bays and 3.5” drive cage can be repositioned or removed using Cooler Master’s FreeForm modular system. Even with the drive bays installed, the case has enough room for graphics cards as long as 11.7” (296 mm), and it can hold cards as long as 16.2” (412 mm) if the drive cage is removed entirely. This case can support ATX, Micro-ATX, and Mini-ITX motherboards with a maximum CPU cooler height of 190mm.
After the left side panel was removed for the first time, I noticed a decent gap in between the thumbscrew and its respective hole, about .375”. The panel doesn’t quite seem to be square with the rest of the case. I also noticed a missing screw in the plastic window on the left side of the case. Other TR case writers have noticed similar fit-and-finish issues with MasterCases in the past, and it’s a little disconcerting that CM still hasn’t nailed down these problems. This is a $160 case, so it should be free of these minor issues.
I found all of the MasterCase’s thumbscrews to be too tight from the factory, so I needed a screwdriver to loosen them. That wasn’t that big of a deal, but it was mildly annoying for a system that’s ostensibly tool-free. A stubby screwdriver will be needed to remove the bottom 3.5” drive cage. That being said, there is plenty of room in between the PSU and the drive cage, The thumbscrews are all captive in the modular components they hold in place. That sounds great in theory, but I found that the screws bind up in their brackets quite often.
The modular 3.5” drive cage is nice, as you can move the cage up or down on the peg area at the front of the case—all the way up, even, if you remove the 5.25” cage. I had enough room for the graphics card prior to removing or adjusting the cage. Cooler Master’s modular system means builders can install more drive cages down the line for extra capacity, should they need it.
Installing the standoffs for my ATX motherboard was an easy task, thanks to the imprinted labels next to each hole and a quick look at the included instructions. The motherboard was easy to slide in and had plenty of clearance. The built-in wiring easily reached the headers on my motherboard, except for that of the front two fans. Only one of the fans had lengthy enough wiring to reach the motherboard headers.
Cooler Master did provide adapters to connect the fans to four-pin Molex plugs on the PSU, but a three-pin extension or two would have been preferable. Otherwise, I had no problems routing my cables and keeping them organized.
To finish off the build, I grabbed Cooler Master’s MasterLiquid 120mm liquid cooler and tried mounting it in a push-pull configuration on the radiator mount on the top of the case. Because of the tight clearances between the top bracket and motherboard, though, there was only room for one fan on the radiator. There was no way to add the “pull” fan on the other side, as it ran into the motherboard. Ultimately, I opted to replace the rear 140-mm fan with the liquid-cooling radiator instead.
While I was building the system, I found the rear plastic bezel to be a small hassle to remove every time I needed to open the side panel, as it covered the thumbscrews and all the cables plugged into the back of the computer. The hinged front plastic panel looks good, but I feel like having to swing it away to gain access to the 5.25” bays could be frustrating if you need access to those bays a lot. Once it’s built and running, though, this case does look good.
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