Three 5.25” drive bays
Four3.5” hard drive bays with 2.5” compatibility
Seven expansion slots
Front I/O panel contains:
Two USB 3.0 connectors
3.5” headphone and microphone connector
Power and reset switches
Dimensions: 19.1” x 8.3” x 17.7”
Supports graphics cards up to 450mm in length
Two 120mm/140mm top fan mount locations
Two side panel 120/140mm fan mount locations
Two front panel 120/140mm fan mount locations
Includes one front-mounted 140mm fan and one rear 120mm fan
Better cooling temperatures on both aftermarket cooler, it's crucial when overclocked the cpu, the temperatures will rise and the stock cooler won't be capable of offering decent temperatures.
The phanteks is a better cooler, the hyper 212 evo is known for being an effective cooler under a good price.
You need to stop and think. The place where the pc is going to be used hot. If heat is going to be an issue then research reviews and get a case with good cooling properties first. Adding fans raises noise levels and may not help a poorly design case.