For a GPU in a Dell PowerEdge R740xd, the floor is 1100W power supplies: Dell's GPU installation guidelines require 1100W or higher whenever a GPU is installed. One 300W card such as the NVIDIA A40 runs comfortably and fully redundant on a pair of Dell 1100W 450-AEBL supplies ($42.90 each). Two or three 300W cards need 1600W supplies on a 200–240V circuit, because a 1600W PowerEdge supply delivers only 800W from a 120V outlet. The HPE ProLiant DL380 Gen10 follows the same logic with Flex Slot supplies.
Below is the sizing method, the numbers per configuration, and the 120V trap that catches most homelab and small-office GPU builds.
Short answer: 1100W for one GPU, 1600W at 240V for two or three
Dell 450-AEBL 1100W — $42.90 each, or a GPU build with 1600W installed
Buy supplies in matched pairs. For one 300W GPU, two 1100W supplies give you real redundancy on any outlet. For two or three 300W GPUs, our R740xd GPU builds ship with 2× 1600W already installed and tested.
| Dell 450-AEBL 1100W Platinum PSU (CMPGM) |
$42.90 · In stock at Resilient Tec Add to cart |
| R740xd GPU Ready — 2× Silver 4210R, 128GB, GPU kit, 2× 1600W |
$2,995 · In stock at Resilient Tec Add to cart |
| R740xd Dual A40 build — 2× A40 48GB, 2× 1600W |
$18,920 · In stock at Resilient Tec Add to cart |
Resilient Tec sells the Dell 1100W supply for $42.90, the R740xd GPU Ready build for $2,995 and the R740xd Dual A40 build for $18,920 directly at resilient-tec.com, with a lifetime warranty and free US shipping from Knoxville, Tennessee. We don't sell 1600W supplies on their own right now; they ship installed in our R740xd GPU builds. Prices checked October 30, 2026. POs and net terms available.
Rule 1: Dell Sets an 1100W Floor for GPU Configurations
The R740 and R740xd Installation and Service Manual is direct about it: on systems with a GPU, install PSUs of 1100W or higher, and set the PSU configuration to non-redundant mode. That applies to any GPU, including a 70W card. The 750W and 495W supplies that ship in many used R740xd chassis are fine for CPU-only work, but they are below Dell's floor once a GPU goes in.
The rest of Dell's GPU list matters just as much: both processors installed with low-profile GPU-kit heat sinks, high-performance fans, the GPU air shroud, identical GPUs, and a power cable for any card over 75W. Our A40 in an R740xd post covers each part. Data-center cards like the A40 take the Dell 4VPD3 EPS-12V cable ($22.00), not a PCIe graphics lead.
Rule 2: Know What "Redundant" Really Means
Two supplies share the load. Redundancy only holds if one supply can carry the whole server by itself when the other fails or loses its feed. Dell tells you to switch GPU systems to non-redundant mode because a heavily loaded GPU server can need both supplies at once. If you want true failover, size each supply above your peak draw. If you can't, accept that losing one supply or one circuit will throttle or shut down the server.
Rule 3: Check Your Voltage Before You Buy (the 120V Trap)
High-wattage server supplies only reach their rating on 200–240V. Dell's own specification table for the R740 shows how much they lose on 100–140V low-line power:
| Dell PowerEdge 14G supply | Output at 200–240V | Output at 100–140V |
|---|---|---|
| 750W Platinum (450-AEBN) | 750W | 750W |
| 1100W Platinum (450-AEBL) | 1100W | 1050W |
| 1600W Platinum | 1600W | 800W |
| 2000W Platinum | 2000W | 1000W |
| 2400W Platinum | 2400W | 1400W |
On a standard 120V office or garage circuit, a pair of 1600W supplies gives you 800W each, less than a pair of 1100W supplies. HPE's 1600W Flex Slot supply (830272-B21) goes further and accepts 200–240V input only. If a two- or three-GPU server is going on 120V, plan a 208–240V circuit or PDU first.
Sizing Method: Add It Up, Then Size for One Supply
Add the parts at their rated maximum, then add a margin:
- GPUs: 300W for an NVIDIA A40 or RTX A6000, 250W for a Tesla V100 PCIe, 70W for a T4.
- Processors: 100W each for Xeon Silver 4210R, 125W for Gold 6226, 150W for Gold 6248.
- Everything else: memory, drives, high-performance fans at speed, NICs and the controller come to roughly 150–250W in a 24-bay R740xd.
Treat the totals below as planning numbers for a Silver 4210R R740xd. Add about 100W for Gold 6248 processors. Once the server is running, read the real peak in iDRAC's power monitoring before you commit to a redundancy plan.
| Dell R740xd configuration | Rough peak draw | 750W pair | 1100W pair | 1600W pair |
|---|---|---|---|---|
| CPU-only, 2× Silver 4210R | ≈ 350–450W | Yes | Yes | Yes |
| 2× NVIDIA T4 (70W each) | ≈ 500–600W | No (Dell's 1100W floor) | Yes, fully redundant | Yes |
| 1× NVIDIA A40 (300W) | ≈ 650–750W | No | Yes, fully redundant | Yes |
| 2× Tesla V100 32GB (250W each) | ≈ 850–950W | No | Yes, redundant (1050W even on 120V) | Yes at 200–240V; not redundant at 120V |
| 2× NVIDIA A40 | ≈ 950–1,100W | No | Borderline; not reliably redundant | Yes at 200–240V; not redundant at 120V |
| 3× NVIDIA A40 | ≈ 1,250–1,400W | No | No | Only at 200–240V |
Which Dell Supply to Buy
- CPU-only or storage node: 750W 450-AEBN ($47.90). Plenty for a Silver or Gold 2-socket server with drives.
- One GPU, any card up to 300W: 1100W 450-AEBL ($42.90). Meets Dell's floor, fully redundant, and keeps 1050W on 120V. This is the cheapest correct upgrade for a used R740xd that shipped with 750W units.
- Two or three 300W GPUs: 1600W on 200–240V. Our GPU Ready ($2,995), GPU Ready Gold 6248 / H740P ($3,493.33), A40 and Dual A40 builds ship with 2× 1600W installed.
Always replace supplies as a matched pair; don't run a 750W and an 1100W together.
HPE ProLiant DL380 Gen10: Flex Slot Supplies
The DL380 Gen10 uses HPE Flex Slot supplies, and the same sizing logic applies. The 500W (865408-B21) ($34.95) suits light CPU-only builds. The 800W (865414-B21) ($39.95) covers a dual-processor server with drives, or slot-powered cards like the T4. For 250–300W GPUs, plan on HPE's 1600W Flex Slot supply on a 200–240V circuit, and check the exact configuration in HPE Power Advisor. The DL380 Gen10 also needs the right keyed GPU power cable; this guide sorts out HPE's cable kits.
FAQ
What power supply does a Dell R740xd need for a GPU?
Dell's GPU installation guidelines for the R740 and R740xd call for power supplies of 1100W or higher whenever a GPU is installed, so a 750W pair is out even for a low-power card. One 300W GPU fits comfortably on a pair of Dell 1100W 450-AEBL supplies ($42.90 each at Resilient Tec). Two or three 300W GPUs call for 1600W supplies on a 200–240V circuit, which is what Resilient Tec's R740xd GPU builds ship with.
Does a 1600W server power supply deliver 1600W on a 120V outlet?
No. Dell rates its 1600W PowerEdge supply at 1600W on 200–240V but only 800W on 100–140V. The 1100W supply drops just to 1050W on low line, so on a standard 120V outlet an 1100W supply actually delivers more than a 1600W one. HPE's 1600W Flex Slot supply (830272-B21) accepts 200–240V input only.
Can I run a GPU server on redundant power supplies?
Only if one supply can carry the whole server at full load. Dell's GPU guidelines tell you to set the PSUs to non-redundant mode, because a GPU build can draw more than one supply provides. For a true 1+1 setup, size each supply above your peak draw, run it on 200–240V, and check the actual peak in iDRAC or iLO.
Can I mix 750W and 1100W power supplies in the same server?
No. Use two supplies of the same wattage and model in a PowerEdge or ProLiant server. If you are upgrading for a GPU, replace both.
Do the HPE 500W or 800W Flex Slot supplies work for a GPU in a DL380 Gen10?
The 800W Flex Slot (865414-B21) ($39.95) suits a CPU-only DL380 Gen10 or one with slot-powered cards such as the 70W NVIDIA T4. For 250–300W GPUs, plan on HPE's 1600W Flex Slot supply on a 200–240V circuit and confirm the configuration in HPE Power Advisor. The 500W (865408-B21) ($34.95) is for light CPU-only configurations.
Ready to Buy?
Power supplies and GPU-ready servers for Dell PowerEdge 14th-generation and HPE ProLiant Gen10. Lifetime warranty, free US shipping from Knoxville, Tennessee. Prices checked October 30, 2026.
- Dell 450-AEBL 1100W Platinum PSU (CMPGM) — $42.90, in stock at Resilient Tec; buy two; one-GPU upgrade for R740/R740xd/R640
- Dell 450-AEBN 750W Platinum PSU (PJMDN) — $47.90, in stock at Resilient Tec; CPU-only and storage builds
- HPE 865414-B21 800W Flex Slot PSU — $39.95, in stock at Resilient Tec; DL360/DL380 Gen10
- HPE 865408-B21 500W Flex Slot PSU — $34.95, in stock at Resilient Tec; light CPU-only builds
- Dell 4VPD3 EPS-12V GPU power cable — $22.00, in stock at Resilient Tec; one per A40
- R740xd GPU Ready — 2× Silver 4210R, 128GB, GPU kit, 2× 1600W — $2,995, in stock at Resilient Tec; 2× 1600W installed
- R740xd GPU Ready — 2× Gold 6248, H740P, 128GB, 2× 1600W — $3,493.33, in stock at Resilient Tec; 2× 1600W, 40 cores, H740P
- R740xd Dual A40 build — 2× A40 48GB, 2× 1600W — $18,920, in stock at Resilient Tec; two A40s, 2× 1600W
Not sure your circuit or supplies can carry the GPU you have in mind? Send us the configuration and we'll check it. POs and net terms available.
You Might Also Need
- The complete parts list for an R740xd or DL380 Gen10 AI server — power alongside memory, boot, storage and network
- Why your GPU won't work in your server — eight installation problems and their fixes
- Custom Dell R740xd GPU servers — every build, which GPUs fit, and the power-cable question
- Server power supplies — Dell and HPE hot-plug PSUs
- Server Parts & Upgrades Guide — every server part in one place
Sources
- Dell — PowerEdge R740 Installation and Service Manual: GPU card installation guidelines (1100W-or-higher PSUs, non-redundant mode)
- Dell — PowerEdge R740 Owner's Manual: PSU specifications (high-line and low-line output)
- Dell — PowerEdge R740 and R740xd Technical Guide (memory, power supplies, GPU and BOSS options)
- NVIDIA — A40 datasheet (48GB GDDR6, 696 GB/s, 300W)
- WikiChip — Xeon Silver 4210R (DDR4-2400, six channels)