Upgrading the NVIDIA RTX A4000: RTX PRO 4000 Blackwell, RTX 4500 Ada or a 16 GB card

RTX A4000 upgrade options in one table

NVIDIA names no successor for the RTX A4000. By published format the card that takes its place slot for slot is the NVIDIA RTX PRO 4000 Blackwell: single slot, 4.4 in high and 9.5 in long like the RTX A4000, with 24 GB of GDDR7 instead of 16 GB of GDDR6 and 145 W instead of 140 W. If 16 GB was enough, the NVIDIA RTX PRO 2000 Blackwell and the NVIDIA RTX 2000 Ada Generation keep that memory at 70 W. The NVIDIA RTX 4500 Ada Generation is the 24 GB card of the Ada generation and needs two slots.

NVIDIA's product page and line card (March 2023) for the RTX A4000; NVIDIA datasheets 5323450 (June 2026), 2895216 (October 2023), 5322351 (June 2026) and 2999417 (January 2024); power cables from NVIDIA's quick start guides.

We supply the four newer cards across the EU. The RTX A4000 itself was announced on 12 April 2021 and is the card this page starts from.

RTX A4000 vs RTX PRO 4000 Blackwell row by row

NVIDIA's product page, line card (March 2023) and press release of 12 April 2021 for the RTX A4000; NVIDIA datasheet 5323450 (June 2026) and product page of 15 October 2026 for the RTX PRO 4000 Blackwell; Video Encode and Decode GPU Support Matrix of 16 October 2026; "CUDA GPU Compute Capability" page of 16 October 2026; RTX PRO Sync Solutions page of 15 October 2026.

The outer dimensions stay. Height, length and slot width are the same in NVIDIA's figures, and the board power rises by 5 W. Memory grows by half, from 16 to 24 GB, and the memory bandwidth by half as well, from 448 to 672 GB/s. The display outputs move from DisplayPort 1.4 to 2.1b; for the new card the datasheet lists four displays at 3840 × 2160 and 165 Hz or two at 7680 × 4320 and 100 Hz.

The core counts belong to two generations, Ampere and Blackwell, and say little across them. NVIDIA's single-precision figures can be set side by side, with the caveat that its own documents disagree for the new card: NVIDIA's datasheet (June 2026) gives 1,178 AI TOPS and 37 TFLOPS, its product page 1,290 and 40. Either value is about twice the 19.2 TFLOPS of the RTX A4000. The Blackwell datasheet footnotes its figure as a peak rate based on the GPU boost clock; neither card's value is a measurement.

For AI work the compute capability belongs next to the core count. NVIDIA lists the RTX A4000 at 8.6 and the RTX PRO 4000 Blackwell at 12.0. NVIDIA's NIM support matrix for visual generative AI of 20 October 2026 ties FP8 to compute capability 8.9 and BF16 to 8.0, so by that matrix the old card is below the FP8 line, while the fifth-generation Tensor Cores of the new one add FP4 to FP8 and BF16.

In video the new card has two encoders with AV1 and 4:2:2 encoding where the RTX A4000 has one without AV1 encoding. Both cards are on NVIDIA's lists for the sync board, the RTX PRO Sync page and the sync table of the 621.14 release notes; that matters for a display wall or simulator that used the RTX A4000 with a sync signal.

We read no published test of the RTX PRO 4000 Blackwell against the RTX A4000. In its professional GPU roundup of 18 December 2025 Puget Systems, testing on a Ryzen 9 9950X3D, measured the new card against the generation in between, the RTX 4000 Ada: 83 per cent faster in V-Ray GPU, 40 per cent in Blender Cycles and 38 per cent in Unreal Engine. Our RTX PRO 4000 Blackwell vs RTX 4000 Ada comparison covers that step.

Checks in the older workstation before the swap

Power lead. NVIDIA's documents for the RTX A4000 name a PCI Express 6-pin cable. The RTX PRO 4000 Blackwell has one PCIe CEM5 16-pin connector, and the adapter in its box runs from one 8-pin PCIe cable. The machine therefore needs an 8-pin PCIe lead for the adapter; the 6-pin plug that fed the old card is not what the adapter takes. NVIDIA names no power-supply wattage for the card. Its board power is 5 W above that of the RTX A4000, so the figure to check is the power-supply rating the workstation's maker gives, with those 5 W added to today's load. Our overview of RTX power connectors lists the cables of all the cards.

Slot. The new card is a PCIe 5.0 x16 card, and NVIDIA's quick start guide asks for a PCI Express x16 slot. The NVIDIA documents we read say nothing about operation in a slot of an older PCIe generation. Look up the generation of the slot in the workstation's manual and ask its maker whether the card is offered for the model.

System memory. With 24 GB on the card, the quick start guide's minimum is 24 GB of system memory and its recommendation 48 GB; by the same rule a machine sized for the 16 GB card may hold less.

Driver. The card runs on the NVIDIA RTX Enterprise Production Branch driver, and the current Windows releases 621.14 (R620), 597.30 (R595) and 582.99 (R580) all list it. An image that was frozen for the RTX A4000 needs a newer driver. By our reading of NVIDIA's product lists the first Linux releases that name the card are 570.169, 575.64 and 580.65.06 in their branches, and the earliest Windows release NVIDIA's driver search returned for it is 573.42 of 17 June 2025.

Windows 10. A workstation bought with an RTX A4000 may still run Windows 10. NVIDIA's release notes for 621.14 say that Release 620 will be the last branch to support Windows 10, tested with version 22H2. A driver for the card under Windows 10 exists today, and no later branch will bring one. The branches and their dates are in our guide to the RTX Enterprise driver on Windows 10 and 11.

Certified software. A certification follows the workstation model. In Dassault's SOLIDWORKS 2026 list, read 10 November 2026, a row certifies one computer model with one card and one driver. The list has rows with desktop workstations and the RTX PRO 4000 Blackwell, but an older workstation model may have rows with the RTX A4000 and none with the new card.

If the cards go into machines you already run, send us the workstation models, the number of RTX A4000 cards and the operating system, and we reply with a written quote within one business day.

RTX PRO 2000 Blackwell, RTX 2000 Ada and RTX 2000E Ada vs RTX A4000 where 16 GB is enough

Three cards we supply have the 16 GB of the RTX A4000 at half its power or less. They suit a move to a smaller chassis or a lower power budget. NVIDIA's single-precision figures for them are below that of the RTX A4000.

NVIDIA's product page and line card (March 2023) for the RTX A4000; NVIDIA datasheets 5322351 (June 2026), 2999417 (January 2024) and 4328932 (October 2025); RTX PRO Sync Solutions page of 15 October 2026 and RTX Enterprise release notes 621.14.

All three are half-height (2.7 in), the format usually called low profile, and 6.6 in long. The RTX PRO 2000 Blackwell and the RTX 2000 Ada are two slots wide, so in slot width they take more than the RTX A4000 did. NVIDIA's quick start guides say that neither uses a power cable. The NVIDIA RTX 2000E Ada Generation is the one of the three that stays in a single slot, at 50 W and with the lowest single-precision figure.

Three things change against the RTX A4000 besides power. The outputs are Mini DisplayPort instead of DisplayPort, which means other cables or adapters at the desk. The memory bandwidth is lower, 288 or 224 GB/s against 448 GB/s. And the sync board is gone: the rule in NVIDIA's RTX PRO Sync user guide is "4000-class and above", and NVIDIA's lists do not contain these cards. On the other side stand AV1 encoding on all three and, on the RTX PRO 2000 Blackwell, compute capability 12.0 with FP4, DisplayPort 2.1b and 4:2:2 encoding.

The details are on the card pages: buy the RTX PRO 2000 Blackwell and its specs, buy the RTX 2000 Ada and its specs, buy the RTX 2000E Ada and its specs. Owners of the smaller RTX A2000 find their path in RTX 2000 Ada vs RTX A2000.

The Ada cards with 24 GB and 20 GB

The RTX 4500 Ada has 24 GB of GDDR6 with ECC, 7,680 CUDA cores and 39.6 TFLOPS of single precision, about twice the figure of the RTX A4000. It is a different size of card: two slots wide, 10.5 in long, 210 W, with a 16-pin connector and, by NVIDIA's quick start guide, an adapter from two 8-pin PCIe cables. Its memory bandwidth of 432 GB/s is slightly below the 448 GB/s of the RTX A4000. Its outputs are DisplayPort 1.4a and its interface is PCIe 4.0 x16. NVIDIA lists it at compute capability 8.9, which brings FP8 and no FP4.

For the sync board the documents differ. 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.

The RTX 4500 Ada is the sound order where a fleet and its images have been validated on Ada cards and the chassis has two free slot widths and two 8-pin leads. Its pages are buy the RTX 4500 Ada and RTX 4500 Ada specs; how it stands against the Blackwell cards is the subject of RTX 4500 Ada vs RTX PRO 4500 and 4000 Blackwell. The Ada card in the RTX A4000's own format is the RTX 4000 Ada, single slot with 20 GB, 360 GB/s and 130 W; the existing comparison linked above deals with it. For the larger Ampere cards see RTX 4500 Ada and 5000 Ada vs RTX A4500 and A5000.

What 24 GB loads that 16 GB does not

The GPU memory figures in the application makers' requirement pages that we read on 10 November 2026 end at 16 GB, so the RTX A4000 still meets those figures. The reason for 24 GB lies in your own scenes and models.

For language models our sizing rule gives the numbers. It takes 0.9 times the memory the driver reports and subtracts 3 GiB, which leaves 11.3 GiB for weights plus KV cache on a 16 GB card and 18.5 GiB on a 24 GB card. The reported memory is scaled from the 95.6 GiB the driver shows on the 96 GB card. We assume that the ratio holds for smaller cards; the driver on the delivered card shows the real figure. By file size on Hugging Face, read 10 November 2026, gpt-oss-20b in MXFP4 (12.82 GiB) is above the budget of a 16 GB card and inside that of a 24 GB card. Ministral 3 14B Instruct in FP8 (14.65 GiB) and Granite 4.2 8b in BF16 (16.38 GiB) do not fit 16 GB and fit 24 GB.

Image models show the same step. By our arithmetic against nine tenths of the card's memory, FLUX.2 klein 4B, which is under Apache 2.0, fits a 24 GB card together with its text encoder, while on 16 GB only the model file fits and the encoder has to stay in system memory.

Ordering the upgrade for one workstation or a fleet

Where the RTX A4000 was bought for a whole row of CAD or visualisation seats, the upgrade is a fleet question. A request that can be quoted without a second round names the workstation models, the number of cards, the operating system and whether you need cards alone or new workstations with the cards built in. The written quote follows within one business day and names the price, the lead time and the warranty terms; the price depends on the quantity, the delivery address and the date of the order.

An order runs on one European contract with an invoice from Austria, and the manufacturer warranty is handled through us. The order of the card is described on our page to buy the RTX PRO 4000 Blackwell, its full sheet is in the RTX PRO 4000 Blackwell specs, and the other one-slot boards are in our comparison of single-slot NVIDIA RTX cards. If you are unsure which of the cards fits, tell us what the RTX A4000 no longer handles and we answer with the card that solves it.

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