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

Great upgrade 4U case for my home lab cloud server. I needed more room to add a RTX-5090 to this rig, and didn't want to go all the way to a 5U case. To be clear, there is only one 5090 card brand (Zotac) that will fit this 4U case with enough room on top to comfortably fit the 600W connector & wiring. If using another brand, I would probably go with a 5u case. I installed the Zotac Solid OC specifically in this build. Other Zotac models will likely fit as well. The SOLIDs 137mm height is a perfect fit for this case (which specifies a154mm max height). The case came with a number of front GPU support brackets. I used one, and it makes for a very solid mount. The 5090s aluminum frame holes at the front of the card lined up perfectly with the holes in the provided bracket. With the card secured with three screws in the back, and the case bracket in the front, I am confident the card will not come loose when removing/installing this case in my rack.As far as cooling, the case will fit one Noctua NF-A14x25r G2 PWM (140mm) and two NF-A12x25 PWM (120mm) in the front panel. It is tight, but can be done. Use the adjustable slots instead of fixed holes to slide the two 120mm fans far to the left and right sides of the case to leave room for the 140mm in the middle. I loaded this case up with a total of 8 fans (added a custom slot bracket with (2) 40mm fans for a total of 7 case fans and a Noctua NH-D12L CPU cooler w/fan). This configuration provides fantastic airflow and dropped the CPU temp by a solid 20C over the previous 2U case which was cooling challenged even with a Ghost S1 CPU cooler and (4) 80mm case fans.. Overall well made case. Even with a 10G NIC card and the RTX 5090 installed, there is still room to access at least 2 of the SATA 2.5" mounting plates comfortably (no wires/cards in the way). I now plan on adding a couple of large SATA drives in raid mirror as a home network file server and for backups, making this machine even more of a Swiss army knife of a server. This combination of fans is almost completely silent, even with a moderate load. With the fans at 100% it is only noticeable if you are in the same room, but I doubt you would hear it in the next room. Overall very happy with this case.One negative ,but not enough to remove a star, the manufacturer does not sell a set of sliding rails that fits this case in short racks (slightly less than 22" deep). This case uses screwless rail studs to connect the rails, and there is no option for screw on rails. The only rails designed for this case are too long for my rack. I ended up using the Cyber Power 4POSTRAIL, which worked, but is VERY tight when sliding in the heavy duty rack ears on this case. Installer trick, don't lock down the rail mounting screws (just hand snug them). After you slide the case in fully (might take some wiggling), lock the back screws and the bottom two screws in front. This will lock the rails in place with perfect spacing/alignment, then you can pull the case out and lock down the top two front screws.

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.