SilverStone Technology RM52 5U Rackmount Server Chassis with Dual 360mm Liquid Cooling Capability, SST-RM52

This RM61-312 6U 12-Bay Rackmount Chassis is rock solid and very heavy, even when its empty.It fit my needs to be able to consoldate two NAS builds I had into ONE NAS server with ample drive space and use my existing ATX mobo, ATX PSU and my 240mm radiator CPU cooler. Once mounted in my rack, it only sticks out about 2", which is much less than a standard rack mount server would.The front upper bay allowed me to install two 5.25" bay hard drive cages (not included with case). It would've fit three but I didn't need a 3rd at this point and used the space to mount a 120mm intake fan.All in, I have 22 spindle 3.5" drives and 4 SSD drives installed.To connect up the 12-bay storage you will need- 3x - SFF-8643 cables (data)- 6x - molex adapters (power)They do include ample screws for just about any configuration imaginable you'd be throwing at this.Cable management was a breeze.The front removable cover does have a thin filter screen on it to block dust intake.Nuances/Annoyances:- On the bottom of the case is a grill to allow the PSU fan output - I had intially planned to have it sit on the bottom of my rack, but instead had to raise it's mounting 1U since my rack is not open bottomed.- I'm not sure if its the dimensions of my 5.25" bay cages, but I had gaps after I mounted the provided 5.25" face plates. They did provide a metal thing, I think, for the left most side, but it didn't fit. There are also the top mounting holes to attach the cages that appeared to be miss-aligned for the left-most bay causing the gap on the left. I ended up 3D designing and printing myself the needed face plates. Which in the end worked out better and made it so I could mount a front intake fan.- The price. Pretty steep. I bit the bullet and went with this one though versus some no-name knock off case because I wanted to ensure the case would be sturdy, not flimsy, with the number of drives it was going to contain. I also wanted piece of mind on the quality components of the HDD back plane. The individual HDD cages seem to be a little bit flimsy. Just be gentle with them.Overall, I'm very pleased with the quality of the case and I'm extemely happy with how the build turned out. This was my first SilverStone case. If I ever decide to build another PC/server, I wouldn't hesitate to get one from them again.

Pros:1) Only NAS chassis I'm aware of with 12 hot-swappable drive bays + 120mm to 360mm radiator support. Most other chassis either give you a lot of drive bays with limited CPU cooler support, or have a wide range of CPU cooler support, but limited drive bays.2) Built like a tank. I don't have this in a server rack mount, so its been taking its fair share of beating when I've had to move it around, but its sturdy as hell.Cons:1) Built like a tank. This thing is heavy even without all 12 bays populated...2) Very sharp corners and panel edges. I hope SilverStone takes some time to find ways to round off the sharp corners and panel edges. I can see someone cutting themselves when rotating this around for maintenance since its already so heavy.Other Notes:Someone else mentioned that the 3 OEM 80mm x 15mm hard drive fans are noisy. They are. According to the manuals the default fan profile when the fan headers are plugged into the backplane is drive temps >= 45C means 99%-100% fan speed. 12 fully populate bays will mean your drives will be 45C or more, so I wouldn't recommend using the backplane fan headers unless you like your fans always at basically 100%I did try a bunch of different brands of fans to test out, and the OEM fans are probably the best 80mm x 15mm fans to have in terms of noise to cooling capabilities.I tried 3 Noctua NF-A8s (80mm x 25mm) mounted behind the backplane bracket towards the PSU (compared to the OEM fans being mounted in front of the backplane bracket towards the backplanes), and while those were definitely quieter they could not sufficiently cool down twelve 3.5in drives without being on 100% speed (and at that point you can definitely hear them).If you want to mount 80mm fans from other brands in the same orientation as the OEM fans then you can get away with anything up to 80mm x 20mm. Otherwise you can go up to 80mm x 25mm without issues when mounting the fans behind the backplane fan bracket towards the PSU.You can technically go as deep as 80mm x 38mm when mounting the fans behind the backplane fan bracket instead of the default OEM orientation, but you may run into some issues with thread holes from the mobo preventing flush mounting of your fans.I settled on 3 Sanyo Denki 9GA0812P1H611 80mm x 38mm fans (mounted slightly crooked) at 6% - 14% duty cycle. That is sufficient for keeping all 12 drives between 38C and 45C during heavy drive loads while keeping the noise as low as possible.