A few weeks ago or perhaps a month ago now I posted asking for some help with picking a few parts to finish a new computer build. As I slowly gather the parts, I inspect them as they come in and also of course because I'm excited to start the building process.
Today, I got my Cooler Master HAF 922
! Now, I didn't expect it to have a fan in the back, just the front and top. I expected to have to add another case fan to the rear to complete the airflow. However, to my surprise, it came with the rear exhaust fan! My question is should I install any fans in any of the optional slots? I have pictures to show which spots are open and which have fans but I read a years ago that you want to have more negative pressure I think to avoid dust build up and improved cooling. In other words, more exhaust than intake air flow. Currently, the top and rear are exhaust and the front clear on in there is intake. The front one is the same large size as the top. I will be overclocking and I like to max out potential so cooling is important to me. Also this is my first build with quietness in mind. I will be using a Noctua NH-C14 for the CPU and I've heard it also helps cool down the rest of the inside of the case too. If I mount a side and/or bottom fan, I assume they'd both be intake facing fans as it wouldn't make sense to make either of those spots exhaust, traditionally anyway.
Should I mount any extra fans, would doing so greatly impact either positively or negatively cooling and would the potential noise increase be worth it? Or will what comes with this case be enough? There seems to be plenty of honeycomb passive airflow areas, so I'm leaning towards seeing how it goes without adding any and then toying with the idea later on if I feel like I can get more overclocking with more airflow in there. Thoughts?
Also, what are those two soft rubbery pizza slice holes in the top on the last picture for? Ive never had a case with those before.