800D has poor case airflow. By that account, it's an overrated case for $250+ imho.
Prepare to be amazed by the variation in cooling performance among cases. Often, some of the most popular cases are actually average or poor at airflow.
For good airflow, Antec Dark Fleet 85, Silverstone FT-02, Silverstone TJ11, Silverstone Raven RV02 or 03 series, Cooler Master HAF X clean up the competition.
If I was spending close to $250-300, I'd much rather grab the
Lian Li PC-A77F or the
P-80 series or the
Silverstone FT-02. Or save some $$ and go for cases with far better airflow.
The point of a large case is to be able to provide awesome airflow with 3-4 graphics cards and a hot CPU. The 800D fails on that promise. I can't stress enough how important good case air flow is. Any case that has poor airflow is a deal breaker, regardless if it costs $20 or $300.
Think about it, sometimes the difference between the best air coolers like NH-D14/ Silver Arrow and a tier below is only 4-5*C, while the difference between the top air coolers and a full-fledged watercooling system is 20*C. Now imagine that 10*C advantage is
completely eliminated by getting a case with inferior air flow? Makes no sense to me since you are just wasting $$$ and not addressing good case air flow. If you want to maximize the value of your cooling systems, prioritize good case airflow. An expensive case does not equal good airflow.
Prepare to be shocked: The difference in cooling between a good case (Silverstone FT-02) and a case with poor airflow (P183) is mind-blowing
http://www.pugetsystems.com/labs/articles/Vertical-vs-Horizontal-Case-Cooling-89/page2
30*C CPU temperature at load.....