According to our information, the BG073 is the version with an insulated side panel, while the BG074 has a tempered glass side panel. The remaining specifications are identical.

The case itself does come with 2 140mm fans. They are amazing and as mentioned adding more 140mm in a case with airflow this good makes for very silent operation. If you have 120mm i would suggest to move the included case fans to the front for intake and install the 120mm to the rear and the top. Allows good airflow to enter the case and the exhaust of the air can be run at lower fan speed with the 120mm