NVIDIA RTX PRO 2000 Blackwell vs RTX PRO 4000 Blackwell: 16 GB at 70 W or 24 GB at 145 W

RTX PRO 2000 Blackwell vs RTX PRO 4000 Blackwell in one table

Between the NVIDIA RTX PRO 2000 Blackwell and the NVIDIA RTX PRO 4000 Blackwell the chassis decides first and the memory second. The RTX PRO 2000 brings 16 GB into a half-height bay at 70 W without a power cable. The RTX PRO 4000 brings 24 GB, more than twice the memory bandwidth and twice the video engines into one full-height slot at 145 W, and it needs a 16-pin power cable. We supply both cards to companies across the EU.

NVIDIA datasheets 5322351 and 5323450 (both June 2026); power cables from NVIDIA's quick start guide for RTX PRO Blackwell cards; RTX PRO Sync Solutions page (15 October 2026), MIG User Guide (4 November 2026) and vGPU supported-GPU list (2 October 2026); the last row is our sizing rule, explained below.

The compute rows need a sentence instead of a cell. For the RTX PRO 2000 the datasheet gives 17 TFLOPS in single precision and 545 AI TOPS. For the RTX PRO 4000 NVIDIA's own documents disagree: NVIDIA's datasheet (June 2026) gives 1,178 AI TOPS and 37 TFLOPS, its product page 1,290 and 40. By either document the larger card has 2.2 to 2.4 times the figures of the smaller one, by our arithmetic. AI TOPS is NVIDIA's theoretical FP4 rate with sparsity and no measured speed.

Small-form-factor chassis and power budget

A full-height card of 4.4 in does not go into a half-height bay, so in a small-form-factor workstation the bay makes the choice: of the two, only the RTX PRO 2000 fits. Its height of 2.7 in is half-height, the format usually called low profile, and it is 6.6 in long; converted, about 69 by 168 mm against about 112 by 241 mm for the RTX PRO 4000. The smaller board is the wider one, though. It takes two slot widths, while the RTX PRO 4000 occupies a single slot.

Power separates the cards in the same way. The RTX PRO 2000 has a maximum power consumption of 70 W, and NVIDIA's quick start guide states that it does not use a power cable, so the slot supplies it. The RTX PRO 4000 is specified with 145 W of total board power through one PCIe CEM5 16-pin connector, and according to the guide its box contains an adapter from one 8-pin PCIe cable. A workstation with neither a spare 8-pin lead nor a 16-pin cable for a graphics card therefore takes the RTX PRO 2000 only. NVIDIA publishes no power-supply wattage for either card, so the check is the system maker's rating: add 70 W or 145 W per card to the load the machine already has. For a fleet the difference adds up. Fifty seats come to 3.5 kW of maximum board power with the RTX PRO 2000 and to 7.25 kW with the RTX PRO 4000, by our arithmetic.

Two smaller rows belong to the chassis check as well. Both cards use PCIe 5.0, the RTX PRO 2000 with eight lanes on a full-length interface and the RTX PRO 4000 with sixteen, and the quick start guide asks for a PCI Express x16 slot. The same guide asks for system memory of at least the GPU memory and recommends twice as much: 16 and 32 GB for the RTX PRO 2000, 24 and 48 GB for the RTX PRO 4000.

We supply both cards across the EU; send us the workstation models and what runs on them, and we reply with the matching card and a written quote within one business day.

16 GB vs 24 GB and what the extra memory loads

For CAD and visualisation the published GPU memory figures do not separate the cards. On the software makers' pages we read on 10 November 2026, 16 GB meets every memory figure, including the 16 GB lines that Lumion 2026 gives for its high-end tier and that Blackmagic's readme of 4 November 2026 gives for the advanced AI tools of DaVinci Resolve Studio 21.2. The step to 24 GB is a matter of the size of your own scenes, assemblies and textures, which no maker's table answers.

For AI models the step can be counted. By our sizing rule a card has a budget for weights plus KV cache of 0.9 times the memory the driver reports, less 3 GiB. The reported memory is our scaling of the 95.6 GiB that the driver shows on the 96 GB card; that step is an assumption, and the figure on the delivered card decides. The result is 11.3 GiB on 16 GB and 18.5 GiB on 24 GB. By file size on Hugging Face, read 10 November 2026:

• Ministral 3 8B Instruct in FP8 (9.70 GiB) fits both cards and leaves 1.6 GiB for context on the RTX PRO 2000 and 8.8 GiB on the RTX PRO 4000;
• gpt-oss-20b in MXFP4 (12.82 GiB), Ministral 3 14B Instruct in FP8 (14.65 GiB) and Gemma 4 E4B-it in BF16 (14.89 GiB) lie inside the budget of the RTX PRO 4000 only;
• Gemma 4 12B-it in BF16 (22.28 GiB) fits neither.

On the 16 GB card gpt-oss-20b is above our budget, and we do not plan on it: its weights exceed 11.3 GiB and stay below 0.9 times the memory, so little or no room would remain for context. Image models show the same step. For FLUX.2 klein 4B, published under Apache 2.0, the model file is 7.22 GiB and the whole pipeline with its text encoder 14.87 GiB; set against 0.9 times the memory, the pipeline fits a 24 GB card whole, while on 16 GB the text encoder has to be unloaded or kept in system memory. The model lists are in our articles on local LLMs on 16 GB cards, on the RTX PRO 4000 Blackwell for local LLMs and on ComfyUI on the RTX PRO 2000, 4000 and 4500.

Published speed figures for the two cards

NVIDIA's rows give the ratios: 2.3 times the memory bandwidth, 2.1 times the CUDA cores and 2.1 times the power on the RTX PRO 4000, by our arithmetic. They are specifications and no measurements.

One public database holds both cards. Blender Open Data, read 10 November 2026, shows for Blender 4.5.0 a median of 6,255.71 samples per minute over 40 submissions for the RTX PRO 4000 and of 3,609.05 over 3 submissions for the RTX PRO 2000, a factor of about 1.7. The database is crowd-sourced, without control of processor or driver, and three entries are a thin basis.

Puget Systems' professional GPU roundup of 18 December 2025, run on a Ryzen 9 9950X3D, tested both cards, each against the Ada card of the same number. The RTX PRO 2000 came out 44 per cent ahead of the RTX 2000 Ada in V-Ray GPU and 31 per cent in Blender Cycles; the RTX PRO 4000 was 83 and 40 per cent ahead of the RTX 4000 Ada. The baselines differ, so these percentages say nothing about the distance between the two Blackwell cards. For language models no measurement in tokens per second exists for either card in the sources we accept.

Video engines, displays and the sync board

Both cards carry NVENC engines of the ninth and NVDEC engines of the sixth generation, and NVIDIA's support matrix of 16 October 2026 lists AV1 encoding, 4:2:2 encoding and an unrestricted number of sessions for both. The RTX PRO 4000 has two encoders and two decoders, the RTX PRO 2000 one of each. A seat that records, transcodes or plays several streams in parallel has twice the engines on the larger card.

Either card drives four displays. The outputs are Mini DisplayPort 2.1b on the RTX PRO 2000 and full-size DisplayPort 2.1b on the RTX PRO 4000, and neither has HDMI. The datasheets list four displays at 4K and 165 Hz for both, written as 3840 × 2160 on the RTX PRO 4000 sheet, and two at 8K and 100 Hz, which the RTX PRO 2000 sheet qualifies with DSC.

The sync board divides them. NVIDIA's RTX PRO Sync page of 15 October 2026 and the sync table of the 621.14 driver release notes list the RTX PRO 4000; neither lists the RTX PRO 2000, and the rule in NVIDIA's user guide for the board is "4000-class and above". A display wall or a simulator that synchronises several GPUs is therefore built with the RTX PRO 4000.

Several cards in one workstation

Here the single slot of the RTX PRO 4000 counts. Four of them sit in four adjacent slots and bring 96 GB in four separate 24 GB units at 580 W of board power, by our arithmetic; our page on four RTX PRO 4000 in one workstation describes such a tower. The RTX PRO 2000 needs two slot widths for 16 GB. Per slot width the RTX PRO 4000 therefore carries three times the memory, while per watt the RTX PRO 2000 carries more: 16 GB at 70 W against 24 GB at 145 W.

Each card's memory stays its own. Neither datasheet lists NVLink, and neither card is in NVIDIA's MIG guide or on its vGPU list, so by our reading each card works as one separate GPU. Two cards hold two models or serve two users; whether one model can be spread over both depends on the software, as our article on llama.cpp across several RTX PRO cards explains.

RTX PRO 4000 SFF Edition with 24 GB at half height

A third card sits between the two. The RTX PRO 4000 Blackwell SFF Edition has the 24 GB and the 8,960 CUDA cores of the RTX PRO 4000 on the board format of the RTX PRO 2000.

NVIDIA datasheets 5322351 (June 2026), 4016700 (August 2025) and 5323450 (June 2026); power cables from NVIDIA's quick start guide.

The SFF Edition has Mini DisplayPort 2.1b outputs, a PCIe 5.0 x8 link and two encoders and two decoders. It is on NVIDIA's RTX PRO Sync page, though not in the sync table of the 621.14 release notes. We supply it as well, and our comparison of the SFF Edition with the RTX PRO 2000 and the L4 goes into it; the overview of low-profile NVIDIA RTX cards shows all half-height boards.

Which card to order for which system

our reading of the NVIDIA documents and file sizes named above.

Ordering, with what the written quote contains, is described on the pages to buy the RTX PRO 2000 Blackwell and to buy the RTX PRO 4000 Blackwell. The full sheets are in the RTX PRO 2000 Blackwell specs and the RTX PRO 4000 Blackwell specs. Where 24 GB is not the end of the question, the next comparison is RTX PRO 4000 vs RTX PRO 4500 Blackwell, and how the smaller card stands next to GeForce cards is in RTX PRO 2000 Blackwell vs RTX 5060 Ti and 5070.

A fleet that mixes compact desktops and towers can need both cards. Tell us the chassis types, the software and the number of seats, and we quote each machine type with the card that fits it.

FAQ