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SilverStone's RM4A (SST-RM4A) is a 4U rackmount chassis designed to accommodate both large server motherboards (up to SSI-EEB) and a 360mm liquid cooling radiator simultaneously. It supports up to eight full-height expansion slots, two 3.5-inch or three 2.5-inch drives plus four additional 2.5-inch drives, front I/O with USB-C and two USB 3.0 ports, and two 80mm rear exhaust fans. For those not using liquid cooling, it can fit CPU heatsinks up to 137–148mm tall. The build quality is noted as excellent, consistent with SilverStone's reputation.

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