# NVIDIA RTX PRO 4000 Blackwell: 24GB in a full-height single slot

Specifications and qualification steps for NVIDIA RTX PRO 4000 Blackwell, covering memory variants, LLM backends, Cycles and system integration.

Author: Retrivium team
Updated: 2026-11-02
Canonical URL: https://retrivium.ai/journal/rtx-pro-4000-blackwell-llm-rendering/
Language: en

NVIDIA RTX PRO 4000 Blackwell is assessed here as an exact Blackwell board configuration. Its published 24 GB capacity is the starting point for a workload qualification, not a measured serving or rendering result.

## Exact model and memory variants

The full-height4000 Blackwell is a 145 W active single-slot24 GB board. The 70 W SFF card has a different physical and power envelope.

| Variant | Memory | Published board power | Cooling / format |
|---|---|---|---|
| NVIDIA RTX PRO 4000 Blackwell | 24 GB GDDR7 ECC | 145 W | Active; 4.4 x 9.5 in; full-height single slot |

Specifications: [Official product/support documentation](https://www.nvidia.com/en-us/products/workstations/professional-desktop-gpus/rtx-pro-4000/).

## LLM backend and memory budget

24 GB Blackwell candidate for bounded quantized-model tests with a pinned compatible package. Full-height and SFF variants have different board envelopes, not just different brackets.

Passing the architecture requirement does not certify every model, quantization kernel or prebuilt package.

Compatibility evidence: [vLLM GPU requirements](https://docs.vllm.ai/en/stable/getting_started/installation/gpu/).

## Cycles and batch rendering

RTX render candidate for constrained slot layouts. Budget scene memory and verify sustained clocks after the board reaches thermal equilibrium.

[Blender 5.2 LTS GPU rendering manual](https://docs.blender.org/manual/en/latest/render/cycles/gpu_rendering.html).

## Integration into a server or workstation

One-slot width can simplify placement beside other expansion cards, but intake obstruction remains possible. Check the full-height bracket and 9.5-inch length. Retain neighboring-card positions when recording a render or inference result.

## A concrete qualification scenario

A workstation already contains a network adapter and capture board. Add the 4000 using a documented slot map, then run the same inference case before and after installing the other boards. For rendering, complete the reference scene in the final layout. A failure that appears only with neighboring equipment should trigger a placement investigation rather than an unsupported claim that24 GB is insufficient.

## The evidence to retain

Keep an ordinary qualification record with the actual test outputs.

Identify the tested variant, software build and execution mode before entering observations. Leave unavailable measurements explicitly unknown.

The fields below separate published specifications from observed allocation and job completion, so a later operator can repeat the same case.

| Evidence field | What this profile must retain |
|---|---|
| Hardware identity | NVIDIA RTX PRO 4000 Blackwell; physical variant and reported device identifier |
| Memory boundary | 24 GB published; observed free memory before and after loading |
| Inference artifact | Exact weights digest, quantization, context and offload configuration |
| Render artifact | Scene digest, renderer version, backend and denoising setting |
| System envelope | Driver, container/build digest, enclosure and cooling configuration |
| Completion evidence | Application exit status, output validity and observed memory failures |

The full-height145 W card and 70 W SFF sibling require separate thermal records even when the same 24 GB artifact loads.

Further reading: [Local LLMs on 24 GB VRAM: Test More Than the Weights](/journal/local-llm-24gb-vram/), [GPU drivers: a controlled comparison of two versions](/journal/gpu-driver-controlled-ab/), [NVIDIA and AMD GPU catalogue](/journal/nvidia-amd-gpu-catalog/).