RM-4U8G
ai-server-platform

RM-4U8G

SKU: LMT-RM-4U8G-LP

A purpose-built integrated-loop liquid-cooled AI server platform. Eight GPU slots in a four-rack-unit envelope, the cooling loop closed inside the chassis, and the rest of the build — motherboard, CPUs, RAM, storage — assembled from off-the-shelf enterprise parts. Designed in Slovenia by the EK engineering team. Engineered to deploy in standard server-room conditions, not just industrial datacentres.

Chassis
4U · 19" standard rack
GPU slots
8 · full-height PCIe
Cooling
Integrated liquid · in-chassis
Max chassis power
Up to 8000 W sustained
CPU sockets
AMD SP5 · Intel LGA 4677
Overview

A barebone server platform engineered as a single thermal and power system

RM-4U8G is the result of asking what an 8-GPU AI server should look like if you started over. The chassis is engineered around a closed liquid cooling loop with an in-chassis radiator. Power distribution is platform-level, separated from the motherboard's VRM. The PCIe slot layout is built around the cooling loop's physical envelope, not retrofitted around a board form factor.

What the platform does not do is force you onto a proprietary motherboard. The board, the CPUs, the memory, the storage, the network adapters — these are all off-the-shelf enterprise parts, sourced and refreshed independently of the chassis. The reason customers buy RM-4U8G is the cooling and the chassis discipline; the reason customers stay with RM-4U8G is that nothing else about the build is locked to one supplier.

Engineered and assembled in Komenda, Slovenia. Cooling system designed by the EK engineering team, twenty-five years deep in high-performance liquid cooling. Pressure envelope, materials, and operating range are documented at the supplier level and do not differ from the rest of the LM TEK liquid-cooling catalogue.

A barebone server platform engineered as a single thermal and power system
At a glance

Six things that matter.

4U envelope

4U envelope

Eight full-height GPU slots in a four-rack-unit chassis. Density that normally needs 6U or 8U.

Eight GPU slots

Eight GPU slots

Full-height PCIe slots, each provisioned for liquid-cooled GPU water blocks at the platform's power envelope.

Integrated liquid cooling

Integrated liquid cooling

Closed loop, in-chassis radiator, no external CDU. Deploys in standard server rooms without facility plumbing.

No motherboard lock-in

No motherboard lock-in

Standard EATX and EEB server boards from your vendor of choice. CPU, RAM, NVMe, NICs are all off-the-shelf.

EK-engineered cooling

EK-engineered cooling

Materials discipline, pressure envelope, and manifold geometry from the EK liquid-cooling reference, transferred to enterprise rack scale.

Platform model

Platform model

Barebone chassis with integrated cooling, power, and platform support. GPUs and internals specified per deployment.

Key engineering

Three design decisions worth calling out.

EATX-compatible · 4U · 19" rack

The chassis is engineered around standard EATX server motherboards rather than a proprietary board. PCIe slot positions and clearance accommodate the cooling loop without needing custom riser cards. Mounting hardware is rack-standard. The platform takes ordinary enterprise components and arranges them at extraordinary density.

Closed integrated liquid loop · in-chassis radiator

Pump, manifold, GPU and CPU water blocks, radiator, and reservoir are all inside the chassis. The radiator faces the front intake; airflow paths are engineered alongside the loop, not as an afterthought. Working pressure 2 500 Pa, max 75 000 Pa otherwise. Materials stack: nickel-plated copper, stainless steel, POM Acetal, EPDM seals.

Redundant high-density PDU · platform-level distribution

Power distribution is engineered at the platform level so the GPU power budget does not depend on the motherboard's VRM. Redundant PSUs, hot-swap modules, and headroom for the full 8-GPU configuration at maximum sustained load. The customer's motherboard chooses CPU and memory; the platform chooses how power reaches the GPUs.

Reference configurations

From starter footprint to production maximum.

Reference configurations · examples drawn from real customer builds. Final BOM is specified per deployment — LM TEK supplies the platform; the GPUs, CPUs, memory, and storage are sourced separately and can vary.

Tier GPU CPU RAM Storage Use case
Modest start 2× NVIDIA RTX 6000 Ada 1× AMD EPYC 9354 (32-core) 256 GB DDR5 ECC 2× 3.84 TB NVMe Workstation crossover · departmental AI · single-team inference
Mid-tier 4× NVIDIA RTX A6000 2× AMD EPYC 9474F (48-core) 512 GB DDR5 ECC 4× 3.84 TB NVMe Lab / research group · multi-user inference · light fine-tuning
Production maximum 8× NVIDIA H200 NVL 2× Intel Xeon Platinum 8580 1 TB DDR5 ECC 8× 7.68 TB NVMe Enterprise inference · production fine-tuning · multi-tenant
Compatible components

Everything in the loop, from the same catalogue.

The cooling loop inside RM-4U8G is built from the same components that ship into LM TEK workstation deployments. Same materials discipline, same pressure envelope, same supplier.

Data centre

H200 NVL

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Pro workstation

RTX 6000 Ada Rack

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Data centre

H100 NVL Rack

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enterprise

CPU WB sTR

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enterprise

EK-Pro CPU WB 4677 Rack Ni + Acetal

View →
Browse the full catalogue →
Technical data

Full datasheet

Form factor 4U · 19" rack chassis
Dimensions (L × W × H) 760 × 482 × 178 mm
Net mass (barebone) 38 kg · approximate
GPU slots 8 × full-height PCIe Gen 5
GPU power envelope Up to 700 W per slot · sustained
CPU sockets supported AMD SP5 · Intel LGA 4677 · per chosen motherboard
Motherboard form factors EATX · EEB · server reference
Memory slots Per chosen motherboard · typically 24 × DDR5 RDIMM
Storage bays 8 × NVMe U.2 · hot-swap · front access
Networking Per chosen motherboard · OCP 3.0 mezzanine supported
Cooling type Integrated liquid · in-chassis closed loop
Coolant materials stack Nickel-plated copper · stainless steel · POM Acetal · EPDM seals
Working pressure 2 500 Pa
Max pressure 30 000 Pa (with EK-Pro PRM) · 75 000 Pa (otherwise)
Operating temperature range 5 – 35 °C ambient · 5 – 60 °C coolant
Power supply Redundant 3000 W · 80 PLUS Titanium · hot-swap
Power distribution Platform-level PDU · independent of motherboard VRM
Country of origin Slovenia

All figures measured at supplier level. Third-party independent measurement reports are available on request under NDA.

Technical drawing

Top & side view, in millimetres

Envelope drawing for rack-integration work. All measurements in mm. Use this to verify clearance to adjacent rack units, to the rack rear, and to any cable-management hardware before specifying.

RM-4U8G dimensional drawing — front, side, and rack envelope. All measurements in mm.

These drawings represent copyrighted material of LM TEK® and they are meant only for your personal use.

Compatibility

Compatibility

Motherboards: EATX and CEB form factors. Server reference boards from major vendors. Workstation boards in the same envelope are also supported but not the primary use case.

CPU sockets: AMD SP5 (EPYC 9004 / 9005) and Intel LGA 4677 (Xeon Scalable 4th / 5th gen) verified. Other server sockets supported via available motherboard choices.

GPUs: Full-height PCIe Gen 5, up to 700 W per slot sustained, water-block-equipped. Verified with the GPU water-block catalogue (RTX 6000 Ada, RTX A6000, H100 NVL, H200 NVL, A100, RTX PRO 6000 Blackwell, others on request).

Networking: OCP 3.0 mezzanine and standard PCIe NICs supported.

Contact Team
In the Box

Shipped contents

  • · Chassis with rack rails and front bezel
  • · Integrated cooling loop · pre-filled, pre-tested with EK-CryoFuel coolant
  • · Redundant power supply assembly
  • · Platform-level power distribution unit
  • · GPU and CPU water blocks per chosen configuration (separately specified)
  • · Mounting hardware kit and integration manual
  • · Quick-disconnect couplings for serviceability
  • · Not included: motherboard, CPUs, GPUs, RAM, storage, network adapters — sourced separately per the configuration BOM

Specifying RM-4U8G into a deployment?

Tell us what is going inside the chassis — board, CPUs, GPUs, memory, storage — and what the deployment envelope looks like. LM TEK engineering will confirm compatibility, validate the cooling capacity for your GPU choice, and produce an integration spec before any quote conversation starts.

Talk to an engineer Back to platform
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