SilverStone RM4A: 4U Rackmount Server/Workstation Chassis That's Great For Liquid Cooling

Written by Michael Larabel in Enclosures on 27 February 2026 at 10:43 AM EST. Page 2 of 2. 9 Comments.

👁 SilverStone RM4A with 360mm radiator

For this SilverStone RM4A server build I carried out an AMD EPYC 9005 "Turin" server build using the Gigabyte MZ33-AR1 E-ATX motherboard with a 500 Watt AMD EPYC 9755 128-core Zen 5 server processor. This was a full load-out with 12 x DDR5 Micron MTC40F2046S1RC64BDY memory, and PCIe Gen 5.0 NVMe SSD storage.

👁 SilverStone RM4A with AMD EPYC liquid cooling setup

For testing the 360mm radiator capacity at the front of the chassis, I was using a SilverStone XE360-SP5 liquid cooling AIO setup. This 360mm radiator fit without issue in the SilverStone RM4A rackmount chassis. Even with the E-ATX motherboard there was enough room at the front of the chassis for not only the three 120mm intake fans to push air through the radiator but also to still add three more 120mm fans behind the radiator to help with airflow and pulling more air through the chassis. Just enough space! The only downside is that having the large radiator setup in the front makes it more difficult to access the 2.5-inch drive mounting areas at the bottom of the chassis after you have mounted the radiator.

👁 SilverStone RM4A assembled

There was enough space as well for using a Corsair HX1500i power supply with this AMD EPYC server build. Two 80mm exhaust fans proved sufficient with this 500 Watt EPYC Turin server build. Even with the radiator installed, there still was space with this server build for accommodating multiple full height expansion cards as needed.

Once the build was up and running I also put it through an array of tests for assessing the thermal performance of the SilverStone RM4A paired with the SilverStone XE360-SP5 for this server build using the AMD EPYC 9755 500 Watt processor and twelve DDR5 RDIMMs.

These results were collected over hours of benchmarking with a variety of different workloads and the EPYC 9755 pulling as much as 583 Watts according to the PowerCap/RAPL interface.

The SilverStone RM4A build with the XE360-SP5 liquid cooling still proved plenty capable of cooling this 500 Watt 128-core processor. The CPU temperature on average was 47 degrees with a recorded peak of just 62 degrees. The noise with the six 120mm fans was a bit high but still quieter than many 2U/4U servers we see in the lab. Not bad at all compared to the smaller, noisier fans. This 4U server build with the SilverStone liquid cooling proved great for the AMD EPYC 9005 1P server build.

Monitoring the drive and memory temperatures too were in good standing with no thermal issues there either with plenty of airflow through the SilverStone RM4A.

👁 SilverStone RM4A with six 120mm fans

The SilverStone SST-RM4A is a well built 4U rackmount chassis that can easily accommodate up to a 360mm radiator or even just air cooling if that's all you need. It's real benefit though is the lack of any obstructions at the front to allow plenty of room for liquid cooling, even if wanting to use six 120mm fans in total for a push-pull setup around the radiator. With the E-ATX Gigabyte MZ33-AR1 motherboard was still enough room for the liquid cooling plus plenty of 2.5-inch storage drives still accessible and the eight expansion slots too for allowing quite a high-end server/workstation build with this 4U server chassis.

As of writing the SilverStone RM4A is currently retailing online for around $281 USD in the US. During these times the pricing isn't all that bad considering basic Rosewill 4U enclosures in the like are up to $200~300 these days (years ago sub $100) in the US. Especially for those wanting to liquid cool a 4U server build, the SilverStone RM4A is a very fine and capable option. Thanks to SilverStone for having sent over the RM4A review sample for testing at Phoronix.

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