ASRock Rack 2U4G-GENOA/M3 — 2U 4-GPU EPYC Barebone (PCIe 5.0, 1+1 2700 W)

A 2U rackmount built around a single SP5 socket that takes four full-length, triple-slot GPU on native PCIe 5.0 x16 — no switch, no lane sharing. Four hot-swap Gen5 NVMe bays, an OCP 3.0 slot for networking and a genuinely redundant 1+1 2700 W Platinum supply. It does in 2U what most of the market needs 4U to do.

Specification

Read the power budget before you choose cards

The 1+1 supply means one module has to carry the whole machine, so the honest budget is 2700 W, not 5400 W. That single number decides which GPU this chassis is for.

Note also that the three internal x16 positions have no external cutout, so an add-in card fitted there has no reachable I/O ports. For compute cards that is irrelevant. For anything you need to plug into, use the rear slots.

Where the 8 DIMM slots bite

SP5 is a twelve-channel platform and this board brings out eight slots at one DIMM per channel. You therefore run eight of twelve channels, whatever you populate, and memory bandwidth lands around two thirds of what the CPU could do. For GPU work, where the cards hold the working set, that trade buys you the 2U height and is usually the right one. For a memory-bound CPU workload it is the wrong chassis and we will tell you so.

It also sets the ceiling: 1 TB with 128 GB RDIMMs, 2 TB with 256 GB 3DS. If you are sizing system memory at twice total VRAM — which is what we recommend — four 96 GB cards want 768 GB, and that needs 96 GB or larger modules.

Rack and cooling

Front-to-back airflow, rated for continuous 24/7 operation in a datacentre rack. Plan a dedicated feed sized for the real load: around 2 kW for a four-card Max-Q build. Cold aisle below 24 °C and real airflow through the rack, not just perforated doors — 2U at this power density is unforgiving of a cabinet that merely looks ventilated.

What is included

What is in the box: chassis, backplane, motherboard, the full fan wall and the power supplies listed above, pre-fitted and cabled. It is a complete, working platform less the parts you choose.

What is not: CPU, memory, drives, GPU and any add-in NIC. Those are specified with you and priced separately — that is the point of buying a barebone rather than a finished server.

What Kentino adds

Every barebone we ship is unpacked, assembled, powered up and tested before it leaves Prague: fan wall and PSU redundancy checked, BMC firmware brought up to the current release, IPMI configured and the network details handed over in writing. You get a machine that has already been switched on once by somebody who knows what it should sound like.

Tell us the workload instead of the part numbers and we will specify the CPU, memory and storage for you, build it, burn it in and ship it as a finished server. The same chassis, the same price for the chassis — we simply add the parts and the work.

Price shown is EUR 5,526 excluding VAT for the barebone as described, EXW Prague (Incoterms 2020). Freight, insurance and any destination duties are for the buyer’s account. Typical lead time 10–28 days. Image: ASRock Rack.