The Thermaltake Core X9 is a builder's dream. There is just a ton of space. You can put a license plate on the X9 and take the family camping. Stack two cases together and you have a condo on the beach. Ok, I exaggerate, but the large internal volume and modular design allow for almost unlimited options for fan and radiator mounting. HDD space? Not a problem. There are dedicated hard drive cages as well as a few places under the motherboard tray to sneak in a few more HDDs. Do you have a custom water cooling system that leaves you grumbling and compromising with other cases? Not a problem with the Core X9. It can handle everything from extra tall CPU coolers to long GPUs.