RTX PRO 4000 SFF, RTX PRO 2000 or L4: choosing a 70 W GPU for compact workstations and edge servers

Why 70 W is its own category

A graphics card that stays at or below about 70 W can run from the PCIe slot alone. That opens machines that cannot take a bigger card: small-form-factor workstations, edge boxes in a factory or a shop, and rack servers with low-profile slots and no GPU power cables. NVIDIA’s quick start guide says it directly: the “RTX PRO 4000 SFF and RTX PRO 2000 do not use a power cable”, and the L4 lists no power connector either.

The catch is the slot. NVIDIA’s power guidelines put it carefully: “Typically, the PCIe slot is rated for 75 W”. Earlier revisions of the PCIe card specification allowed low-profile cards far less power than full-height ones, so a low-profile slot in a compact PC is not automatically a 75 W slot. Before ordering, check that the maker lists a 70 W low-profile card for the exact chassis.

The three cards side by side

NVIDIA datasheets and product pages: RTX PRO 4000 SFF (August 2025), RTX PRO 2000 (August 2025), L4 (2023). NVIDIA publishes the Blackwell cards’ tensor rate in FP4 and the L4’s in FP8, so the tensor row does not compare like with like.

Read the tensor row carefully. At the same precision, FP8 with sparsity, the two Blackwell cards would come to about half their FP4 figures, roughly 385 and 272 TFLOPS by our arithmetic against the L4’s 485, so on paper the L4 has the highest FP8 and FP32 rates of the three. The RTX PRO 4000 SFF has the most memory bandwidth, and bandwidth decides how fast a language model generates tokens.

Cooling decides where each one goes

The L4 is a data-centre card. NVIDIA describes it as “passively cooled” and “requiring system airflow to operate”, with a heatsink that accepts air in either direction, rated for 0 to 50 °C. In a server with front-to-back airflow that is an advantage: no fan to fail, and the server’s fans do the work. In a desktop PC without directed airflow over the slot, a passive card is the wrong choice.

The two RTX PRO cards are workstation cards with their own blower fans, display outputs and the full-height and low-profile brackets both supplied. They work in a compact desktop, drive four monitors and need nothing from the chassis except a slot rated for a 70 W low-profile card and some fresh air. In a server they can work where the server maker supports them, but they bring display hardware the server does not need and are not on NVIDIA’s vGPU list.

Local AI in 16 or 24 GB

Memory sets the model size. A 24 GB card takes gpt-oss-20b at 13.8 GB with a long context, an 8B model in BF16 or FP8, a 14B model in FP8, or a 32B model in 4-bit at about 18 to 20 GB with a short context. A 16 GB card takes gpt-oss-20b, 8B models at 8-bit and 14B models at 4-bit. Bandwidth then sets the speed of token generation: 432 GB/s on the RTX PRO 4000 SFF against 300 on the L4 and 288 on the RTX PRO 2000.

Formats differ too. The Blackwell cards run NVFP4, the 4-bit format NVIDIA’s TensorRT-LLM supports on Blackwell; the L4 runs FP8, and 4-bit weights as INT4 through AWQ or GPTQ. For measured numbers on the smallest card, a hosting provider tested the RTX PRO 2000 with language models and reported 62.5 tokens per second on gpt-oss-20b and 27.8 on a 14B model in 4-bit, at about 65 W under load. Puget Systems measured the RTX PRO 2000 about 25 per cent faster than the RTX 2000 Ada in its local language-model test. Our VRAM guide has the full sizing arithmetic.

Video: the L4’s speciality

For video, the L4 has four decoders and four JPEG decoders, more than either RTX PRO card, and two encoders, as many as the RTX PRO 4000 SFF; all three cards encode AV1. NVIDIA quotes up to 1,040 concurrent AV1 streams at 720p30 for a server with eight L4 cards, about 130 per card, and 120 times the AI video performance of a dual-socket CPU server in an end-to-end analytics pipeline, both for eight cards. For camera analytics, transcoding and video search, it is the card built for the job.

The Blackwell cards bring what the L4 lacks: 4:2:2 encoding and decoding for H.264 and HEVC, which broadcast and professional video formats use, and display outputs for a video workstation. The RTX PRO 4000 SFF has two encoders and two decoders, the RTX PRO 2000 one of each.

Sharing: vGPU only on the L4

Of the three, only the L4 is on NVIDIA’s vGPU list, supported since vGPU 15.2 and still listed as fully supported in NVIDIA’s lifecycle page of August 2026. It splits into profiles from 1 to 24 GB: up to 24 virtual desktops per card with 1 GB profiles, or up to six compute vGPUs of 4 GB each (L4-4C) under NVIDIA AI Enterprise. Both need NVIDIA licences. None of the three supports MIG. For virtual desktops in low-profile servers, the L4 is the only choice among them.

Which card for which machine

The Blackwell cards also improve on their own predecessors in the same format. Puget Systems measured the RTX PRO 2000 44 per cent faster than the RTX 2000 Ada in V-Ray GPU and 31 per cent faster in Blender, and our comparison of the RTX PRO 4000 and the RTX 4000 Ada covers the SFF pair.

What comes after the L4

NVIDIA now calls the L4 “previous-generation” and, as of September 2026, lists no 70 W Blackwell data-centre card to replace it. The card it compares with the L4 is the RTX PRO 4500 Blackwell Server Edition: 32 GB at 800 GB/s, 165 W, passive, in a single-slot full-height, full-length format, which NVIDIA says delivers “over 5x the performance of the previous-generation L4 GPU” in small-model AI inference, a claim that comes without published test conditions. For virtual workstations, NVIDIA’s own sizing guide puts the gain over the L4 at 90 per cent. The RTX PRO 4500 Server Edition is a successor for servers with full-size slots and power to spare, not for the low-profile slots the L4 was made for. Where the slot is low-profile and the budget is 72 W, the L4 remains the data-centre option.

What we supply

Eurokommerz supplies the RTX PRO 4000 SFF, the RTX PRO 2000 and the NVIDIA L4 EU-wide with manufacturer warranty, as cards or in configured workstations and servers, alongside the rest of the professional GPU range. Send us the chassis model, and we will confirm the slot and the cooling before the order.

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