THE 509 ROG CERTIFIED EXTERIOR
Thanks to its clean lines and tempered glass panels the somewhat large (527mm tall, 235mm wide and 578mm long) 509 looks great (i still don't know if i like the 5.25" optical bay however).
The entire left side panel is made out of tempered glass (unfortunately unlike the 303 which has an easy removable panel the panel in the 509 is held in place with 4 thumbscrews) and the Rog certified logo is printed on the lower right corner.
As you can see the tempered glass fascia has plenty of space behind it allowing for air to reach the intake fans.
Worth pointing out is that the left tempered glass is 5mm thick while the fascia one is 3mm thick.
Again the front is probably less "attractive" than it would be without a 5.25" bay but still it looks nice.
The I/O is placed beneath and next to the 5.25" bay so here we have the on/off power button, reset button, two USB 3.0 ports, two USB 2.0 ports and the usual headphones and microphone ports.
The logo placed right beneath the bay lights up red unless you connect it to a controller (in which case you may access its RGB feature).
In order to access the air-filter and fan mounts behind the fascia you will need to remove both side panels as seen above.
Here you can either put 3x120mm fans, 2x140mm fans or a 360mm radiator.
As you can see the right side panel has a vertical perforated section as opposed to the 303 and its horizontal one.
Moving at the rear you will see the first glimpse of the why this is the ROG Certified Edition and of course we're talking about the 8 red painted PCI shields.
Unfortunately as mentioned earlier there are no fans inside the 509 but at the rear you can mount one 120/140mm exhaust fan.
A large removable air-filter takes most of the base of the 509.