NVIDIA RTX 4500 Ada vs RTX PRO 4500 and 4000 Blackwell: 24 or 32 GB, one slot or two

RTX 4500 Ada and the two Blackwell cards beside it

The NVIDIA RTX 4500 Ada Generation has two counterparts in the Blackwell generation, depending on what is held constant. By number it is the NVIDIA RTX PRO 4500 Blackwell Workstation Edition, which has 32 GB instead of 24 GB in the same dual-slot format at 200 W. By memory it is the NVIDIA RTX PRO 4000 Blackwell, which keeps 24 GB and moves into a single slot at 145 W. NVIDIA names no successor for the RTX 4500 Ada, so the choice follows from the workstation and the workload.

NVIDIA datasheets 2895216 (October 2023), 5323450 (June 2026) and 5108623 (April 2026).

By our arithmetic from these rows, the RTX PRO 4000 offers the same memory size with 56 per cent more bandwidth for 65 W less, in half the slot width. The RTX PRO 4500 Workstation Edition offers a third more memory at a little over twice the bandwidth for 10 W less, in the same slot position.

Why the model numbers do not line up between the generations

A model number stands for a different memory size in each generation. Among the Ada cards the RTX 4000 Ada has 20 GB, the RTX 4500 Ada 24 GB and the RTX 5000 Ada 32 GB. Among the Blackwell cards the RTX PRO 4000 has 24 GB and the RTX PRO 4500 Workstation Edition 32 GB. The Blackwell card with the memory of the RTX 4500 Ada therefore carries the number 4000, and the one numbered 4500 has the memory of the RTX 5000 Ada. The 20 GB card of the Ada generation has its own page, RTX PRO 4000 Blackwell vs RTX 4000 Ada.

That also settles the search for an "RTX 4500 Ada 32GB": no such card exists, and NVIDIA's datasheet gives the RTX 4500 Ada 24 GB. The 32 GB workstation cards are the RTX 5000 Ada (buy, specs) and the RTX PRO 4500 Workstation Edition, and those two meet in RTX 5000 Ada vs RTX PRO 4500 Blackwell.

NVIDIA announced the RTX 4500 Ada on 8 August 2023 at SIGGRAPH and the two Blackwell cards on 18 March 2025 at GTC. Published comparisons pair the cards by number, as Puget Systems' roundup of 18 December 2025 and our tier-by-tier overview of RTX Ada and RTX PRO Blackwell do. This page adds the pairing by memory.

A second card is called RTX PRO 4500 Blackwell: the Server Edition, a passive single-slot card with 165 W for rack servers. It is no workstation card and stays outside this comparison; its pages are buy the RTX PRO 4500 Server Edition and the Server Edition specs.

GDDR6 at 432 GB/s, GDDR7 at 672 and 896 GB/s

All three cards have memory with ECC. The RTX 4500 Ada reaches 432 GB/s with GDDR6 on a 192-bit interface. The RTX PRO 4000 keeps the 192-bit width and reaches 672 GB/s with GDDR7; the RTX PRO 4500 Workstation Edition has a 256-bit interface and 896 GB/s.

Bandwidth is the rate at which the GPU reads its own memory. For local AI the memory size comes first, because it decides what loads at all. By our sizing rule a 24 GB card has a budget of 18.5 GiB for model weights plus KV cache and a 32 GB card 25.7 GiB: 0.9 times the memory the driver reports, less 3 GiB. The reported memory is scaled from the 95.6 GiB the driver shows on the 96 GB card, an assumption, and the driver on the delivered card decides.

The RTX 4500 Ada and the RTX PRO 4000 therefore have room for the same files. Sizes read from Hugging Face on 10 November 2026 give two examples inside 18.5 GiB: gpt-oss-20b in MXFP4 with 12.82 GiB and Ministral 3 14B Instruct in FP8 with 14.65 GiB. Gemma 4 12B-it in BF16 (22.28 GiB) and Devstral Small 2 24B Instruct in FP8 (24.02 GiB) need the 25.7 GiB of the 32 GB card. The Ada side is worked through in RTX 5000 Ada and RTX 4500 Ada for AI.

Slots, length and power cable in an existing workstation

The RTX PRO 4500 Workstation Edition and the RTX 4500 Ada have the same published outline: 4.4 in high and 10.5 in long, about 112 by 267 mm converted, two slots, active cooling. Both have a 16-pin PCIe CEM5 connector, and NVIDIA's quick start guides list an adapter from two 8-pin PCIe cables in either box. For the Ada card the connector is named only in the guide, because its datasheet has no such row. Where an RTX 4500 Ada sits today, the Blackwell card asks for the same slot position and the same two 8-pin leads, at 200 W instead of 210 W.

The RTX PRO 4000 is a different board. It is 9.5 in long, about 241 mm converted, takes a single slot of full height and comes with an adapter from one 8-pin PCIe cable for its 145 W. Against the Ada card it frees one slot width and one power lead, which matters in towers that hold several cards; our comparison of single-slot NVIDIA RTX cards covers that use.

NVIDIA publishes no power-supply wattage for any of the three cards. Its quick start guide for the Blackwell cards asks for system memory at least equal to the GPU memory and recommends twice as much, which is 48 GB for the RTX PRO 4000 and 64 GB for the RTX PRO 4500 Workstation Edition.

We supply all three cards across the EU; send us the workstation model and the card it holds today and we name the Blackwell card that fits its slots and power leads, with a written quote within one business day.

PCIe 5.0, DisplayPort 2.1b and 4:2:2 encoding

NVIDIA datasheets 2895216, 5323450 and 5108623; the connector of the RTX 4500 Ada and all adapters from NVIDIA's quick start guides for the RTX Ada and the RTX PRO Blackwell cards. The Ada datasheet also lists 4 × 5120 × 2880 at 60 Hz.

None of the three cards has an HDMI output, and each drives four displays at most. The line for two 8K displays rises from 60 to 100 Hz with DisplayPort 2.1b. NVIDIA's quick start guide for the Ada cards lists a DisplayPort-to-HDMI adapter in the box.

The video engines are the same in number: two encoders and two decoders on each card. NVIDIA's Video Encode and Decode GPU Support Matrix of 16 October 2026 lists all three with AV1 encoding and an unrestricted number of NVENC sessions, and it lists 4:2:2 encoding for the two Blackwell cards and not for the Ada card.

FP8 on the Ada card, FP4 on the Blackwell cards

NVIDIA datasheets 2895216, 5323450 and 5108623; NVIDIA's product page for the RTX PRO 4000 Blackwell (15 October 2026) for the second value; NVIDIA's CUDA GPU Compute Capability page of 16 October 2026.

The core counts belong to two generations and do not rank the cards against each other. In single precision NVIDIA's documents disagree on the RTX PRO 4000: its datasheet (June 2026) gives 1,178 AI TOPS and 37 TFLOPS, its product page 1,290 and 40. Either value is close to the 39.6 TFLOPS of the RTX 4500 Ada, so on paper the RTX PRO 4000 gains through memory bandwidth and features. The RTX PRO 4500 Workstation Edition, with 51 TFLOPS, is above both.

The Tensor figures cannot be compared across the generations. The Ada datasheet states 634.0 TFLOPS as an effective FP8 rate with sparsity, while the 1,617 AI TOPS of the RTX PRO 4500 Workstation Edition and the two values of the RTX PRO 4000 are FP4 figures with sparsity; all of them are peak figures on paper, not measured rates.

FP4 is the format the Ada card lacks. NVIDIA describes the fifth-generation Tensor Cores of the Blackwell cards as adding FP4 precision; its documents give the Ada generation FP8 and no FP4 acceleration in hardware. Model files in NVFP4 compute natively only on the Blackwell cards.

Puget, Blender and SPEC results for the three cards

Puget Systems ran its professional GPU roundup of 18 December 2025 on a Ryzen 9 9950X3D. For the RTX PRO 4500 Workstation Edition against the RTX 4500 Ada its text gives a lead of 73 per cent in V-Ray GPU, 50 per cent in Blender Cycles, 43 per cent in OctaneBench, 35 per cent in After Effects 3D, 32 per cent in Topaz Video AI and 28 per cent in Unreal Engine. The RTX PRO 4000 is set against the RTX 4500 Ada once: 30 per cent ahead in V-Ray GPU. The scores are in chart images, so only the percentages can be quoted; our page on the 32 GB RTX PRO 4500 Blackwell discusses them.

Blender Open Data is a crowd-sourced cross-check without control of processor or driver. Read on 10 November 2026 for Blender 4.5.0, with OptiX and CUDA submissions pooled, the median is 5,673.65 samples per minute for the RTX 4500 Ada (5 submissions), 6,255.71 for the RTX PRO 4000 (40) and 8,486.57 for the RTX PRO 4500 Workstation Edition (17; the Server Edition has a row of its own). By our arithmetic the two Blackwell cards lie 10 and 50 per cent above the Ada card.

SPEC has published results with the RTX 4500 Ada, among them SPECapc for SolidWorks 2024 on a Dell Precision 3680 with a GPU composite of 5.40 at Full HD with FSAA (summary updated 26 November 2024); we found none with a Blackwell card. For language models we can quote no token rate for any of the three cards.

Drivers, certification, sync board, MIG and vGPU

Drivers. The newest releases of all three branches list the three cards, the Workstation Edition under the name NVIDIA RTX PRO 4500 Blackwell: 582.99 (R580), 597.30 (R595) and 621.14 (R620) on Windows, 580.196.07, 595.112.07 and 620.70.06 on Linux. One current driver therefore runs a mixed fleet, as our article on mixing Ada and Blackwell GPUs describes. A frozen image is the exception. By our reading of NVIDIA's product lists the two Blackwell cards first appear in Linux 570.169, 575.64 and 580.65.06 in their branches, and the earliest Windows release that NVIDIA's driver search shows for them is 573.42 of 17 June 2025; an image on an older driver has to be updated before a Blackwell card goes into it.

Certification. Dassault's SOLIDWORKS 2026 certification list, read 10 November 2026, has rows with desktop workstations for the RTX 4500 Ada, the RTX PRO 4000 Blackwell and the RTX PRO 4500 Blackwell; it does not separate the two editions of the last one. Each row stands for one computer model with one card and one driver, so the thing to look up is the workstation model.

Sync board. The RTX PRO 4000 and the RTX PRO 4500 Workstation Edition are on NVIDIA's RTX PRO Sync page of 15 October 2026 and in the sync table of the 621.14 release notes. For the RTX 4500 Ada, NVIDIA's datasheet and its RTX PRO Sync page list the card as compatible; the sync table in the 621.14 driver release notes does not.

MIG and vGPU. None of the three is on NVIDIA's vGPU list of 2 October 2026. The RTX 4500 Ada and the RTX PRO 4000 are not in the MIG guide of 4 November 2026. NVIDIA's MIG guide lists an RTX PRO 4500 Blackwell without naming the edition; the Workstation Edition datasheet does not mention MIG. We do not plan on it; the details are in MIG and vGPU on RTX PRO and RTX Ada cards.

The card to order, case by case

• A fleet validated on the RTX 4500 Ada is extended. Order the same card: the image, the driver and the certification row stay as they are. See buy the RTX 4500 Ada and the RTX 4500 Ada specs.
• 24 GB is enough and the seat is new. The RTX PRO 4000 gives the same memory at 672 GB/s and 145 W in one slot: buy the RTX PRO 4000 Blackwell, specs.
• Scenes or models outgrow 24 GB. The RTX PRO 4500 Workstation Edition takes the slot position of the Ada card with 32 GB: buy the RTX PRO 4500 Blackwell. The step between the two Blackwell cards is in RTX PRO 4000 vs RTX PRO 4500 Blackwell.
• GPU rendering is the main load. The published results point to the RTX PRO 4500 Workstation Edition; the RTX PRO 4000 is ahead of the Ada card by a smaller margin.
• Model files in FP4, 4:2:2 video or DisplayPort 2.1b displays. Either Blackwell card; the Ada card has none of the three.

If two of these cases apply at once, describe the application and the workstation the card goes into and we quote the card that fits, or two of them side by side.

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