NVIDIA RTX power connectors and power supply: RTX A400 to RTX PRO 5000 Blackwell
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- Six of the eleven cards on this page have the connector NVIDIA calls PCIe CEM5 16-pin: RTX PRO 4000 Blackwell (145 W), RTX PRO 4500 Server Edition (165 W), RTX PRO 4500 Workstation Edition (200 W), RTX 4500 Ada (210 W), RTX 5000 Ada (250 W) and RTX PRO 5000 Blackwell (300 W)
- NVIDIA's quick start guides list an adapter from one 8-pin PCIe cable for the RTX PRO 4000 Blackwell and from two 8-pin PCIe cables for the RTX PRO 4500 Workstation Edition, the RTX PRO 5000 Blackwell, the RTX 5000 Ada and the RTX 4500 Ada
- The same guides say that the RTX PRO 2000 Blackwell and the RTX 2000 Ada, both 70 W, do not use a power cable
- For the RTX A1000 and the RTX A400, NVIDIA's datasheet gives a maximum power consumption of 50 W and names no auxiliary power connector; the datasheet of the RTX 2000E Ada gives 50 W and has no connector row
- NVIDIA publishes no power-supply wattage for any of these cards, so the check is made on the workstation: its supply rating, its free power leads and the rating of its slot
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Power connector and board power of the eleven cards
This page covers eleven of the NVIDIA professional cards we supply, and they fall into three classes of power connection. Six have the 16-pin connector that NVIDIA calls PCIe CEM5 16-pin: the NVIDIA RTX PRO 4000 Blackwell at 145 W, the NVIDIA RTX PRO 4500 Blackwell Server Edition at 165 W, the NVIDIA RTX PRO 4500 Blackwell Workstation Edition at 200 W, the NVIDIA RTX 4500 Ada Generation at 210 W, the NVIDIA RTX 5000 Ada Generation at 250 W and the NVIDIA RTX PRO 5000 Blackwell at 300 W. Two cards of 70 W, the NVIDIA RTX PRO 2000 Blackwell and the NVIDIA RTX 2000 Ada Generation, use no power cable according to NVIDIA's quick start guides. For three cards of 50 W, the NVIDIA RTX 2000E Ada Generation, the NVIDIA RTX A1000 and the NVIDIA RTX A400, the datasheets name no connector.
The last column of the table says where NVIDIA states the connector, because the documents are not equally complete.
| CARD | MAXIMUM POWER | AUXILIARY CONNECTOR | STATED IN |
|---|---|---|---|
| RTX PRO 5000 48 GB | 300 W | 1 × PCIe CEM5 16-pin | datasheet |
| RTX 5000 Ada | 250 W | 16-pin PCIe CEM5 | quick start guide |
| RTX 4500 Ada | 210 W | 16-pin PCIe CEM5 | quick start guide |
| RTX PRO 4500 (workstation) | 200 W | 1 × PCIe CEM5 16-pin | datasheet |
| RTX PRO 4500 Server Edition | 165 W | 1 × PCIe CEM5 16-pin | datasheet, product brief |
| RTX PRO 4000 Blackwell | 145 W | 1 × PCIe CEM5 16-pin | datasheet |
| RTX PRO 2000 Blackwell | 70 W | none, no power cable | quick start guide |
| RTX 2000 Ada | 70 W | none, no power cable | quick start guide |
| RTX 2000E Ada | 50 W | no connector row | datasheet |
| RTX A1000 | 50 W | none named | datasheet |
| RTX A400 | 50 W | none named | datasheet |
NVIDIA datasheets 5349550 (June 2026), 2898211 (August 2023), 2895216 (October 2023), 5108623 (April 2026), 5192801 (April 2026), 5323450 (June 2026), 5322351 (June 2026), 2999417 (January 2024), 4328932 (October 2025), RTX A1000 (April 2024) and 3279761 (May 2024), in the order of the rows; NVIDIA's quick start guides for the RTX PRO Blackwell cards and for the RTX Ada cards (2023); product brief PB-12790-001_02 (20 April 2026).
The power figure is the one the datasheet prints as total board power or maximum power consumption. The datasheets of the RTX 5000 Ada and the RTX 4500 Ada have no row for the connector at all; for these two the quick start guide is the only NVIDIA document that names it.
The 16-pin connector and the adapters NVIDIA lists
NVIDIA's Blackwell datasheets write "1x PCIe CEM5 16-pin", and the quick start guide of the Ada cards speaks of a 16-pin PCIe CEM5 connector. The product brief of the Server Edition adds the designation 12V-2x6 for the same connector. This page keeps NVIDIA's wording and uses no other name for it. The names that Dell, HP and Lenovo use in their workstation documents are compared in RTX PRO cards in Dell, HP and Lenovo workstations.
The five workstation cards with this connector come with an adapter, according to the box contents in NVIDIA's quick start guides. The number of 8-pin PCIe cables it takes differs, and the table multiplies the board power for systems with several cards.
| CARD | ADAPTER PER GUIDE | ONE CARD | TWO CARDS | FOUR CARDS |
|---|---|---|---|---|
| RTX PRO 4000 Blackwell | from 1 × PCIe 8-pin | 145 W | 290 W | 580 W |
| RTX PRO 4500 (workstation) | from 2 × PCIe 8-pin | 200 W | 400 W | 800 W |
| RTX 4500 Ada | from 2 × PCIe 8-pin | 210 W | 420 W | 840 W |
| RTX 5000 Ada | from 2 × PCIe 8-pin | 250 W | 500 W | 1,000 W |
| RTX PRO 5000 48 GB | from 2 × PCIe 8-pin | 300 W | 600 W | 1,200 W |
adapters from NVIDIA's quick start guides for the RTX PRO Blackwell and the RTX Ada cards; board power from the datasheets; the columns for two and four cards are our multiplication and say nothing about whether a chassis takes that many cards.
With these adapters the workstation needs one free 8-pin PCIe lead per RTX PRO 4000 Blackwell and two per card for the other four. The Ada guide is specific on two points: it asks for two separate 8-pin PCI Express cables from the system power supply, and it tells the user to use only the adapter that NVIDIA includes. Four RTX PRO 4000 Blackwell therefore occupy four 8-pin leads for 580 W of board power, and two RTX PRO 5000 Blackwell occupy four leads for 600 W.
We supply all of these cards across the EU; send us the workstation model and the power leads it has free and we reply with a written quote within one business day.
70 W and 50 W cards and the 75 W slot
Below the 16-pin class the documents get shorter, and each card is best quoted for what its own papers say.
- RTX PRO 2000 Blackwell and RTX 2000 Ada, 70 W. NVIDIA's quick start guides for the Blackwell and the Ada cards state that these two do not use a power cable.
- RTX 2000E Ada, 50 W. The datasheet gives a total board power of 50 W and has no connector row. Lenovo's product guide for its option with this card (LP2207, updated 6 October 2025) states that the card does not require an auxiliary power cable.
- RTX A1000 and RTX A400, 50 W. NVIDIA's datasheet gives a maximum power consumption of 50 W and names no auxiliary power connector.
A card without a cable takes all of its power through the slot. NVIDIA's power guidelines for workstation products, version 15 of 27 July 2023, put the typical rating of a PCIe slot at 75 W. The 70 W cards sit 5 W under that typical figure and the 50 W cards 25 W under it. That version dates from before NVIDIA announced the RTX 2000 Ada, the RTX A1000, the RTX A400 and the RTX PRO 2000 Blackwell, so the sentence is a reference point and no approval of a particular card or machine.
"No power cable" therefore moves the question from the power supply to the slot. What a slot delivers is set by the maker of the system, and compact systems are where it is worth reading: check in the documentation of the chassis that the slot intended for the card is rated for 50 W or 70 W. All five cards are 2.7 in high; the page on low-profile NVIDIA RTX cards compares them, and single-slot NVIDIA RTX cards shows which of them take one slot.
One further point concerns fleets. A seat that moves from an NVIDIA T400 (30 W by its datasheet) or a Quadro P1000 (47 W) to an RTX A400 or an RTX A1000 moves to a 50 W card, as our article on replacing Quadro P1000, T400 and T1000 cards sets out.
The Server Edition at 165 W, adjustable down to 100 W
For the RTX PRO 4500 Blackwell Server Edition, NVIDIA's product brief states a range where the other sheets state one figure: 165 W as default and as maximum, 100 W as minimum. The limit is set with nvidia-smi, where it is reset when the driver loads, or through SMBPBI, where it persists.
The brief describes one 16-pin auxiliary power connector that carries up to 165 W. It also describes the case in which the two sense pins of the connector are shorted: the connector then delivers at most 150 W, and the rest, up to the 165 W of the card, comes through the PCIe edge connector. The card is passive and built for servers; which cable a given server uses for it is stated in the documentation of the server's maker. The workstation card of the same number is a different product with 200 W and active cooling, as RTX PRO 4500 or RTX PRO 4500 Server Edition explains.
NVIDIA publishes no power-supply wattage
Searches such as "RTX PRO 5000 Blackwell power supply" or "RTX 2000 Ada PSU requirements" expect one number. NVIDIA prints none: neither the datasheets of these eleven cards nor the quick start guides we read contain a wattage for the power supply. The guides refer to NVIDIA's power guidelines for workstation products instead. For GeForce cards NVIDIA does publish a "Required System Power", which it ties to a named test system; the professional datasheets have no such row, and we do not print a figure of our own in its place.
What can be checked is the workstation itself, in four steps.
- The rating of the power supply. Add the board power of the planned cards to the load the system already has and compare the sum with the rating its maker gives. The table above supplies the first number.
- The power leads. Count the free 8-pin PCIe leads: one per RTX PRO 4000 Blackwell, two per card for the other four workstation cards with the 16-pin connector. The Ada guide asks for two separate cables.
- The slot. The quick start guides of the Blackwell and the Ada cards ask for a PCI Express x16 slot; for the cards without a cable the rating of that slot counts as well.
- The room in the chassis. Slot width and length decide whether the planned number of cards fits before power does.
For a build with several cards the wall power is an estimate of its own. Our pages on four RTX PRO 4000 in one workstation and on two RTX PRO 6000 Workstation Edition cards work such an estimate through, from the board power of the cards, the processor and an allowance for the rest of the system. If the cards go into machines you already run, tell us the models and the number of cards per machine, and the written quote names the card and the adapter for each.
Replacing an older card changes the cable
The larger RTX A-series cards of the Ampere generation have 6-pin and 8-pin connectors. Every card of 145 W and more on this page has the 16-pin connector, so an upgrade changes the cabling even where the board power stays the same. The closest current card for each RTX A-series card is set out in our upgrade map for RTX A-series cards.
| OLDER CARD | BOARD POWER | CONNECTOR | SLOTS |
|---|---|---|---|
| RTX A2000, 6 or 12 GB | 70 W | none | dual, 2.7 in high |
| RTX A4000 | 140 W | 6-pin | single |
| RTX A4500 | 200 W | 1 × 8-pin PCIe | dual |
| RTX A5000 | 230 W | 8-pin | dual |
| RTX A6000 | 300 W | 8-pin, CPU type | dual |
NVIDIA datasheets of the RTX A2000 (1987439 r5) and the RTX A4500 (May 2022), NVIDIA's product pages of the RTX A4000, RTX A5000 and RTX A6000 and NVIDIA's quick start guide for the RTX A-series cards.
Three pairs show the pattern. The RTX A4000 has a 6-pin connector at 140 W; the RTX PRO 4000 Blackwell in the same single-slot format needs one 8-pin PCIe lead for its adapter. The RTX A4500 and the RTX PRO 4500 Workstation Edition are both 200 W cards, the first with one 8-pin connector and the second with a 16-pin connector whose adapter takes two 8-pin leads. The RTX A6000 and the RTX PRO 5000 Blackwell are both 300 W cards; the older one uses an 8-pin connector of the CPU type, the newer one the adapter from two 8-pin PCIe leads. Only the 70 W step stays cable-free on both sides, from the RTX A2000 to the RTX 2000 Ada or the RTX PRO 2000 Blackwell. The upgrade paths are worked through in RTX A4000 upgrade: RTX PRO 4000 Blackwell or Ada and in RTX 4500 Ada and RTX 5000 Ada vs RTX A4500 and RTX A5000.
Where each card is described
- 300 W: RTX PRO 5000 Blackwell with 48 GB: 48 GB vs 72 GB specs, buy.
- 250 W and 210 W: RTX 5000 Ada: specs, buy. RTX 4500 Ada: specs, buy.
- 200 W and 165 W: RTX PRO 4500 Blackwell Workstation Edition: specs, buy. RTX PRO 4500 Blackwell Server Edition: specs, buy.
- 145 W: RTX PRO 4000 Blackwell: specs, buy.
- 70 W: RTX PRO 2000 Blackwell: specs, buy. RTX 2000 Ada: specs, buy.
- 50 W: RTX 2000E Ada: specs, buy. RTX A1000: specs, buy. RTX A400: specs, buy.
The cards in order of memory, with the tasks each one suits, are in our guide to NVIDIA RTX workstation GPUs from 4 GB to 48 GB.
FAQ
Which power connector does the RTX PRO 4000 Blackwell have?
Which power cable do the RTX PRO 4500 Blackwell and the RTX PRO 5000 Blackwell need?
Which power connector do the RTX 5000 Ada and the RTX 4500 Ada use?
What are the PSU requirements of the RTX 2000 Ada?
What are the power supply requirements of the RTX A1000 and the RTX A400?
Which power supply does NVIDIA recommend for RTX PRO Blackwell cards?
What does PCIe CEM5 16-pin mean?
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