L4 vs RTX PRO 4500 Server Edition: is it the NVIDIA L4 successor, and for which server slots

L4 vs RTX PRO 4500 Server Edition: the short answer

The card NVIDIA compares with the L4 is the RTX PRO 4500 Blackwell Server Edition. Its product page says it “delivers over 5x the performance of the previous-generation L4 GPU” in small-model inference, without test conditions, and does not call it a successor. The two cards fit different slots. The L4 is a 72 W low-profile, single-slot card powered from the PCIe slot, while the RTX PRO 4500 Server Edition is a 165 W full-height, full-length single-slot card with a 16-pin power connector. It can take the L4’s place in servers with full-size slots and GPU power cables, not in the low-profile slots of edge and general-purpose servers.

Per card, the Blackwell card brings 32 GB instead of 24 GB, 800 GB/s instead of 300 GB/s, FP4 Tensor Cores, MIG with two 16 GB instances and faster video decoders. Eight of them add up to 256 GB of GPU memory at 1,320 W of board power, against 192 GB at 576 W for eight L4. Where a server offers only low-profile slots or a tight power budget, the L4 remains the data-centre card for the job, and our comparison of the 70 W low-profile cards covers the workstation alternatives in that format.

L4 and RTX PRO 4500 Server Edition specifications

NVIDIA L4 product page, datasheet (AUG24) and product brief PB-11316-001_v01 (March 2023); NVIDIA RTX PRO 4500 Blackwell Server Edition product page, datasheet (Apr26) and product brief PB-12790-001_02 (20 April 2026); NVIDIA vGPU supported-GPU list (updated 2 October 2026); NVIDIA MIG user guide (updated 11 September 2026) for the JPEG engines. NVIDIA marks the L4’s tensor figures “Shown with sparsity”; the RTX PRO 4500 Server Edition datasheet carries no such note.

The tensor row does not compare like with like, because NVIDIA states the sparsity basis for the L4 only. Memory bandwidth sets token generation speed for one user, and the RTX PRO 4500 Server Edition has 2.7 times as much. Both depend on the server’s fans. NVIDIA’s product briefs give an ambient range of 0 to 50 °C for the L4 and 10 to 45 °C for the RTX PRO 4500 Server Edition, while Lenovo’s guide lists 0 to 50 °C for the latter; the limit that applies is the one the server maker sets for the chassis.

The Blackwell card’s product brief recommends a PCIe Gen5 x16, Gen5 x8 or Gen4 x16 link, so a PCIe Gen4 x16 slot is within NVIDIA’s recommendation. The brief gives a 100 W minimum power limit. A cap set with nvidia-smi has to be set again after each driver load, while one set out of band through SMBPBI stays in force across driver loads and reboots.

L4 successor and Blackwell alternatives: what NVIDIA says

The “over 5x” sentence appears in the small-model inference section of NVIDIA’s RTX PRO 4500 Server Edition page, with no footnote, so the model, precision and batch size behind it are unknown, and we do not use it for sizing. The word “successor” appears neither on that page nor in the card’s product brief.

NVIDIA’s vPC sizing guide, updated on 19 August 2026, is more specific about desktops. It states that “The NVIDIA RTX PRO 4500 Blackwell Server Edition is the primary recommended GPU for NVIDIA vPC” and calls it a modernisation path for customers moving from Ampere (A-series) or Ada Lovelace (L-series) data-centre GPUs. As of the update of 2 October 2026, NVIDIA’s vGPU list shows the L4 with “Full Support” and “Active” in its column for the date last shipped; the page sets no end date for the card.

We found no low-profile Blackwell data-centre card from NVIDIA as of October 2026. The low-profile Blackwell cards NVIDIA offers, the RTX PRO 4000 SFF and the RTX PRO 2000, are workstation cards, and neither is on the vGPU list. The RTX PRO 4500 Server Edition guide covers the card itself in more depth.

Language models in 24 GB and 32 GB

We size with the rule from our guide to how much VRAM an LLM needs: 90 per cent of the card’s memory, less about 3 GiB for activations and the runtime, holds the weights and the KV cache. Both cards have GDDR memory with ECC, and NVIDIA’s CUDA C++ Best Practices Guide states that with ECC enabled “the available DRAM is reduced by 6.25%”. That leaves about 17.2 GiB on an L4 and 23.9 GiB on an RTX PRO 4500 Server Edition with ECC on, or 18.5 and 25.7 GiB with it off. Qwen3-14B in FP8 has 15.2 GiB of weights on Hugging Face, so with an FP8 cache at a full 8,192-token context an L4 holds about 3 concurrent conversations with ECC on (5 with it off) and the Blackwell card about 13 (16). Qwen3-32B in FP8, at 32.0 GiB, fits neither card. NVIDIA’s NVFP4 checkpoint of Qwen3-32B takes 19.3 GiB, which leaves the Blackwell card room for about four such conversations (six with ECC off) and exceeds the L4’s budget.

Bandwidth then sets the speed. For the same model, single-user token generation on the RTX PRO 4500 Server Edition can run up to about 2.7 times faster than on the L4, the ratio of their bandwidths; that is a ceiling from the specifications, not a measurement. NVIDIA lists FP8 and INT8 rates for the L4 but no FP4 rate, so NVIDIA’s NVFP4 checkpoints use FP4 arithmetic only on the Blackwell card.

MIG changes how small models share a card. The RTX PRO 4500 Server Edition splits into two instances, each with its own memory, cache and compute cores according to the product brief. A 16 GB instance takes an embedding model, a reranker or a model of up to about 8B parameters in FP8, at one byte per parameter. The L4 has no MIG, so two models on one L4 share its memory and compute without that isolation.

Eight cards per server: memory, power and cables

For a platform serving several departments, compare per server. NVIDIA’s vPC sizing guide gives a maximum of 8 RTX PRO 4500 Server Edition boards or 16 L4 boards per 2U server; whether a given chassis takes that many is set by its maker.

Our arithmetic from the specifications in the first table, before processors and fans. Desktops: NVIDIA vGPU user guide (L4-2B, maximum 12 per GPU, updated 29 September 2026) and NVIDIA vPC sizing guide (16 per RTX PRO 4500 Server Edition with a 2 GB profile, updated 19 August 2026); maximum density, not a recommendation.

Sixteen L4 give more memory and more decoders than eight RTX PRO 4500 Server Edition cards at slightly less board power, but in 24 GB slices without MIG and with 300 GB/s per card. Eight Blackwell cards give fewer, faster and larger devices that MIG can split into sixteen isolated 16 GB instances. Capped at 100 W, eight cards draw 800 W, with lower performance.

The cables are part of the order. Lenovo’s product guide for the card, updated on 28 July 2026, states that auxiliary power cables do not ship with the GPU and that “Cables are server-specific due to length requirements.” An L4 needs no auxiliary cable, so it also fits servers without GPU power cabling where the maker lists it for the slot.

We build AI servers to order with either card and check the rack, power and airflow before we quote. Send us the server model, its slot types and the power per rack position through the form below.

Video engines, decoders and camera streams

The L4 has 4 NVDEC decoders, 2 NVENC encoders and 4 JPEG decoders; the RTX PRO 4500 Server Edition has 3 of each video engine and, per NVIDIA’s MIG guide, 2 JPEG engines. NVIDIA’s NVDEC application note for Video Codec SDK 13.1 gives indicative rates per engine at 1920 × 1080: 903 frames per second for H.264 and 1,641 for HEVC on Ada, and 2,172 and 1,872 on Blackwell. By our arithmetic the decode ceiling at 30 frames per second is 120 H.264 or 218 H.265 streams for an L4 and 217 H.264 or 187 H.265 streams for an RTX PRO 4500 Server Edition. NVIDIA measured those rates at the highest video clock and says performance “should scale according to the video clocks”, so these are upper bounds.

For H.265 cameras the L4 therefore keeps a slightly higher decode ceiling at less than half the power, while the Blackwell card decodes H.264 faster and adds 4:2:2 encoding and decoding for H.264 and HEVC; both cards encode AV1. In NVIDIA’s DeepStream 7.1 documentation, updated 15 September 2025, one L4 ran 68 H.264 or 81 H.265 streams at 1080p30 through the TrafficCamNet sample pipeline; we found no published DeepStream stream count for the RTX PRO 4500 Server Edition. The DeepStream 9.1 performance table, updated on 28 July 2026, has a column headed “RTX 4500” without saying which card it is, so we do not attribute its figures to the Server Edition. Camera counts per card and server are in our guide to GPU servers for video analytics.

vGPU profiles, seats and MIG

Both cards are on NVIDIA’s vGPU list. The L4 offers B-series desktop profiles of 1, 2 and 3 GB for up to 24, 12 and 8 users per card, Q-series profiles from 1 to 24 GB, and compute profiles from L4-4C, six per card, to L4-24C. Our page on L4 vGPU profiles lists them all.

The RTX PRO 4500 Server Edition needs vGPU release 20.0 or later, and its product brief names R595 or later drivers. NVIDIA’s vPC sizing guide gives 16 users per board with a 2 GB profile, against 12 for an L4 at the same size, and marks 1 GB profiles “Not supported on Blackwell”, where the L4 reaches 24. For compute, NVIDIA AI Enterprise lists time-sliced profiles of 8, 16 and 32 GB, up to four per card, and MIG-backed profiles of 8, 16 and 32 GB. The vPC guide warns that its maximum densities are not “a recommended deployment point” and recommends a proof of concept on the target GPU, since current desktop operating systems and applications need larger frame buffers. Both cards are on the NVIDIA AI Enterprise 8.2 support matrix, which supports them on servers listed as NVIDIA-Certified Systems.

When the L4 remains the right card

Our reading of the NVIDIA specifications, the vPC sizing guide and the decode arithmetic above; check that the server maker lists the card for the exact chassis and slot.

Where the slots, cables and rack power allow 165 W cards, the RTX PRO 4500 Server Edition gives more memory, 2.7 times the bandwidth, FP4 and MIG in one full-height slot. Our L4 vs L40S comparison covers the larger Ada card for models of up to 48 GB.

We supply both cards for servers you already run and in AI servers built to order. Tell us which servers you run today and what the cards should serve, and we reply with the card for each slot and the number per server.

What we supply

We supply the NVIDIA L4 and the RTX PRO 4500 Server Edition as GPUs for servers you already run, or in AI servers built to order, assembled and burn-in tested, with manufacturer warranty, on one EU contract and invoice. We check the rack, power and airflow before we quote, and we build on your own chassis after a compatibility check of the platform, power and cooling. NVIDIA vGPU and NVIDIA AI Enterprise licences come on the same invoice as the hardware. Configuration and quote follow within one business day.

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