A Look Inside
The Q300P and Q300L are exactly the same inside. Removing the side panel reveals a very open design, which is becoming more and more popular. This case does support Mini-ITX and Micro-ATX motherboards.
At the bottom of the inside of the case is where you’ll find the power supply mount. Cooler Master lets us know these cases support power supplies up to 160 mm. The entire bottom section of the case is ventilation, which will help cool your power supply, but you can also install a 120 mm fan in the bottom of the case. There are four expansion slots, they are the ones that are attached to the case frame and need to be popped off.
Looking at the rest of this compartment we can see there is a CPU cutout in the motherboard tray and multiple large cable routing holes.
Removing the opposite side panel we can take a look at the area behind the motherboard tray. Below the CPU cutout there is a removable hard drive tray that supports a single 3.5-inch hard drive. Towards the left there are holes to mount two 2.5-inch drives, so in total you have support for three hard drives.
If you are wondering about space behind the motherboard tray you have a little over an inch of space between the back of the motherboard and the backside of the case.