The quad 5090 server rig

Four RTX 5090s: 128GB of VRAM and 7,168 GB/s of aggregate bandwidth, for people who know what a power budget is.

TECHNICAL DIFFICULTY: 4 OF 4 · SERVER ROOM

How hard is this to assemble? four graphics cards, dual power supplies, ECC system memory, rack-grade parts: board-level assembly and a tuning afternoon

This is the build the difficulty rating exists for. Four RTX 5090 cards mean two power supplies planned against a 2,400W draw, a case with the airflow of a wind tunnel, and tensor parallelism configured by hand. Nothing here is plug in and go: you are assembling a small server. What you get for the pain is the fastest token production per dollar that exists in 2026, and image and video generation that a Mac simply cannot touch. It will not run the 400B+ MoE class: 128GB of VRAM is huge but their weight matrices are bigger at usable quantization.

WHO THIS BUILD IS FOR

You know what a power budget is because you have exceeded one before. You want maximum tokens per second, image and video generation at production quality, and you accept that setup day is a project with a parts list. This is the home datacenter tier.

ESTIMATED TOTAL

$7,996

at MSRP, not yet price-checked
first check: next Monday

The parts

NVIDIA RTX 5090 32GB x4 32GB 1792GB/s nvidia

Four cards: 128GB VRAM total, 7,168GB/s aggregate. Dual PSU territory (2x 1,600W).

at MSRP, not yet price-checked

$7,996

What it runs

Ternary Bonsai 2 27B

6GB of ternary weights (1.76 bits per weight): this stack renders it faster than any single-GPU box on earth.

GLM-5.3-Flash

2-bit puts 80GB of weights across 128GB of VRAM with tensor parallelism: real context, four fans of noise.

Qwen3.8-Omni-Flash

4-bit is 62GB in 128GB: the omni model plus video generation headroom.

WHAT IT WILL NOT RUN

Nothing local, honestly - but the 2.8T MoE class is still out of reach, and the power bill is a real line item at 2,400W sustained.

POWER, NOISE, AND THE ROOM IT LIVES IN

Two power supplies, 2,400W at full load: you will want a dedicated circuit and you will hear it. The build assumes you enjoy cable management the way some people enjoy gardening.