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Silver 2U rackmount barebone server chassis with twelve front drive bays

ASUS

ASUS RS521A-E12-RS12U-20TW1G barebone server 1 CPU 24 DDR5 12 NVMe 2000W

SKU CH-1GMX-14QZW MPN RS521A-E12-RS12U-20TW1G

A 2U barebone server supporting a single AMD EPYC 9005 processor, 24 DDR5 ECC memory slots, 12 hot-swap NVMe bays, five PCIe 5.0 slots for two dual-slot GPUs.

  • Single AMD EPYC 9005 up to 192 cores for heavy compute
  • 24 DDR5 ECC channels deliver 5200 MHz memory bandwidth
  • 12 hot-swap NVMe bays plus 2 M.2 slots scale storage fast
  • 5 PCIe 5.0 slots support 2 dual-slot GPUs for AI workloads
  • 1+1 redundant 2000 W 80PLUS Titanium PSU ensures uptime

Single-Socket EPYC 9005 Platform

This 2U barebones server accepts one AMD EPYC 9005 or 9004 series processor up to 192 cores and 400 W TDP. It targets data-centre teams that need dense compute for AI, HPC or virtualisation workloads in a standard rack footprint.

24-Channel DDR5 ECC Memory Subsystem

Twenty-four DDR5 registered ECC slots run in 12-channel mode at 5200 MHz, supporting up to 3 TB total capacity. This bandwidth ceiling decides whether the chassis can feed your working set without stalling.

Twelve Hot-Swap NVMe Bays

The front panel holds twelve hot-swap NVMe drives, while two rear M.2 slots and five PCIe 5.0 slots accommodate up to two dual-slot GPUs such as NVIDIA A100 or AMD Instinct. Builds needing more than twelve front NVMe devices or more than two full-length accelerators will outgrow this chassis.

How it compares

Measured against everything we stock in Barebone Servers & DIY Kits, at today’s prices. Recalculated every night.

Price $2,311.99
Cheaper than about 55% of the 532 comparable items (median $2,503.49).

New to this? Buying server hardware with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Size & build
Shipping weight31.96 kg
Package size1105 × 584 × 279 mm

Questions about this item

What does the 24 DDR5 slots mean for memory capacity in this server?

The board provides 24 DDR5 ECC registered slots in a 12-channel layout, supporting up to 3 TB total at 5200 MHz.

How does PCIe 5.0 affect the 12 NVMe bays and five expansion slots?

The 12 front hot-swap bays and five full-length slots all run at PCIe 5.0, giving each NVMe drive and add-in card the full 5.0 bandwidth.

What physical space and power connections does the 2U chassis require?

The unit occupies 2U in a 19-inch rack and draws power through the dual 2000 W 80PLUS Titanium supplies.

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