If you are sizing a Dell PowerEdge R750 deployment, budgeting rack power and cooling, or trying to answer "which power supply do I actually order," you have hit the same wall we hear about every week: Dell publishes PSU ratings, not system draw, and the one genuine independent power test on the market measured a different model — the storage-dense R750xd, not the base R750. This page fills that gap. We receive, configure, test, and warranty R750s and the compatible power supplies, so the numbers here are grounded in the platform's real component makeup, not a spec-sheet copy-paste.

Below you get an estimated idle / typical / peak draw table by configuration, the full factory PSU option matrix with the 120 V low-line derating Dell buries in a footnote, the R750's FR / FTR redundancy modes and what Hot Spare really does, a plain sizing framework, BTU for cooling, and an energy-cost formula you can drop your own utility rate into. We cite every spec to Dell's techspecs, Intel ARK, the 80 PLUS standard, or a clearly labeled independent test.

Short answer: a Dell PowerEdge R750 CTO server draws roughly 90–120 W at idle in a light single-socket build and up to 850–1,050 W at peak in a dual-socket, top-bin configuration (two 270 W 3rd Gen Intel Xeon Scalable CPUs) packed with NVMe drives — and 1,450–1,700 W once you add two 300 W GPUs. These are engineering estimates from published component TDP plus platform overhead, not bench measurements; we show the methodology and its bounds in full below.

How much power does a Dell PowerEdge R750 actually draw?

The published numbers for this exact question openly contradict each other, which is why nobody has a clean answer. One widely-shared power calculator lists the R750 at 120 W idle; independent measured testing of the same-generation R750xd logged 360–390 W idle. Both can be "right" — they describe completely different builds. So here is a defensible, config-aware estimate instead of a single misleading figure.

The R750 is a 2U rack server built on up to two 3rd Gen Intel Xeon Scalable ("Ice Lake-SP") processors, up to 40 cores and 270 W TDP each, across 32 DDR4 DIMM slots, with up to 24 × 2.5-inch SAS/SATA or NVMe drives. The table below is built by summing published component power — Intel ARK CPU TDP plus DIMM, drive, and platform figures — for representative configurations. Every cell is a calculated estimate, not a measurement. Treat the ranges as planning numbers; actual draw depends on workload, DIMM density, drive type, and fan speed.

Methodology (so you can reproduce or adjust it): CPU power = number of sockets × Intel ARK TDP for the tier — 120 W for a low-tier Xeon Silver, 205 W for a mainstream Gold, and 270 W for a top-bin Platinum. Add roughly 4–5 W per RDIMM (significantly more for 64/128 GB LRDIMMs, which idle high), drive power by type (SATA/SAS SSD ~3 W, SAS HDD ~9 W active, enterprise NVMe up to ~25 W active), and a platform-overhead term of about 75–120 W for the board, iDRAC9, OCP NIC, PERC controller, and up to six hot-plug fans (fan power climbs steeply under high-TDP thermal load).

"Typical" assumes 30–50% CPU utilization; "peak" assumes sustained all-core load, where AVX-512 can briefly push a socket above its nameplate TDP.

Configuration class	CPUs (TDP tier)	DIMMs	Drives / GPU	Idle (est.)	Typical (est.)	Peak (est.)
Entry, single-socket	1 × Silver 4310 (120 W)	8	2 × SSD	~90–120 W	~130–180 W	~200–260 W
Entry, dual-socket	2 × Silver 4310 (120 W)	16	8 × SAS HDD	~150–200 W	~300–370 W	~430–520 W
Mainstream, dual-socket	2 × Gold 6338 (205 W)	16	8–12 SAS/SSD	~180–240 W	~400–500 W	~600–720 W
High-performance, dual-socket	2 × Platinum 8380 (270 W)	32	16–24 × NVMe	~230–340 W	~600–780 W	~850–1,050 W
GPU / AI (base R750)	2 × Platinum 8380 (270 W)	32	2 × 300 W GPU	~330–450 W	~1,000–1,300 W	~1,450–1,700 W

Reality check against measured data (different model — labeled). The only genuine measured R750-family power data available is VirtualBytes' review of the PowerEdge R750xd — the storage variant, not the base R750. Their unit — two Xeon Gold 6342 (24-core, 230 W each), 1 TB RAM (eight 128 GB DDR4 LRDIMMs), four 1.92 TB NVMe SSDs, dual 1400 W PSUs — logged (via iDRAC) idle 360–390 W and peak ~503 W. Two calibrations for that data point:

• The R750xd's 360–390 W idle sits above our high-performance idle range (~230–340 W) because of its 1 TB LRDIMM loadout — eight 128 GB LRDIMMs idle far higher than the 16–32 GB RDIMMs in our estimate rows. That is exactly why "idle" is config-sensitive, and why a generic "120 W idle" only describes a single-CPU build.
• The R750xd's ~503 W peak is a real-workload benchmark peak on 460 W of CPU nameplate, not a synthetic power-virus. Our "peak" column is the sustained-all-core planning ceiling and reads higher for equivalent silicon; most production workloads land between our "typical" and "peak."

Want a config-specific figure rather than a class estimate? Dell's free Enterprise Infrastructure Planning Tool (at dell.com/calc) lets you build your exact R750 and returns a power budget. Run your own configuration there for a purchase decision; the class ranges above are for quick planning.

R750 power supply options at a glance

The R750 takes up to two hot-plug power supply units with 1+1 redundancy. The factory menu is wider than the R740's and — the key difference — offers 80 PLUS Titanium across the wattage range, not just at one low wattage. Figures below are from Dell's R750 Technical Specifications. The peak-power column is Dell-published; read the heat column with the note beneath the table.

Wattage / class	Input mode	High-line output (200–240 V)	Low-line output (100–120 V)	Peak power (high-line)	Heat ceiling (computed)
700 W Titanium	Mixed Mode — 200–240 V only	700 W	Does not operate on 120 V	1,190 W	~2,388 BTU/hr
800 W Platinum	AC autoranging 100–240 V	800 W	800 W (no derate)	1,360 W	~2,730 BTU/hr
1100 W Titanium	AC autoranging / 240 V MM	1,100 W	1,050 W (derated 50 W)	1,870 W	~3,753 BTU/hr
1400 W Platinum	AC autoranging / 240 V MM	1,400 W	1,050 W (derated 350 W)	2,380 W	~4,777 BTU/hr
1800 W Titanium	Mixed Mode — 200–240 V only	1,800 W	Does not operate on 120 V	3,060 W	~6,142 BTU/hr
2400 W Platinum	AC autoranging / 240 V MM	2,400 W	1,400 W (derated 1,000 W)	4,080 W	~8,189 BTU/hr
2800 W Titanium	Mixed Mode — 200–240 V only, C22 inlet	2,800 W	Does not operate on 120 V	4,760 W	~9,554 BTU/hr

Dell also lists a 1100 W −48 to −60 V DC unit for telco and DC-plant deployments. The "heat ceiling (computed)" column is arithmetic, not a Dell-published BTU figure: it is the rated wattage × 3.412 (the watts-to-BTU/hr constant), shown here as a planning ceiling. Dell's own techspecs publishes an official maximum-heat-dissipation figure derived from maximum input power (output ÷ efficiency), which runs somewhat higher than these; use the actual-draw method in the cooling section for real numbers, not either nameplate.

Enterasource stocks the full Platinum ladder for this platform. Most refurbished R750 deployments land on the 800 W or 1400 W tier: the 800 W Platinum PSU is the 120 V-friendly, no-derate choice for light single-socket builds, and the 1400 W Platinum PSU is the mainstream workhorse for dual-socket and drive-dense configs. Between them sits a 1100 W Mixed-Mode Platinum PSU we carry for the R650/R750 platform — a Platinum Mixed-Mode unit, not Dell's factory 1100 W Titanium menu option, which we do not stock. GPU and top-bin builds move up to the 2400 W Platinum PSU; the one Titanium we stock is the 2800 W Titanium PSU (200–240 V, C22 inlet).

PSU redundancy on the R750: FR, FTR, Non-Redundant, and Hot Spare

The R750's 15th-generation firmware names three redundancy modes — and getting them right is the difference between a UPS that holds and one that trips. This is also where the R750 differs from the R740's simpler "1+1 vs 2+0" labeling. Per Dell's R750 Installation and Service Manual:

• Full Redundancy (FR): a single PSU can carry the entire system load, including transients, if its partner fails. Usable budget = one PSU's rating. A 1400 W FR pair gives you a 1,400 W redundant budget, not 2,800 W.
• Fault Tolerant Redundancy (FTR): allows a smaller PSU pair; if redundancy is lost, the system actively manages and caps the load increase to avoid an unexpected shutdown. This is the mode most R750 buyers actually run — the Dell forum buyer sizing a UPS had "PS Fault Tolerant Redundant (1+1), 1400 W, Mixed Mode," and never got a straight watts answer.
• Non-Redundant (1+0): one PSU, or two summed with no failover. The 2800 W Titanium is Non-Redundant (1+0) only.

Dell recommends the 2400 W Platinum PSU over the 1400 W for Full Redundancy on heavy builds, because transients on a loaded dual-Ice-Lake configuration can exceed 1,400 W and trip protection. Both PSUs must also match: if two differ at POST only the larger is enabled with a mismatch warning, and a run-time hot-add is enabled only if its wattage equals the installed unit. Order matched pairs.

Hot Spare is Dell's efficiency feature for redundant pairs, configured in iDRAC. When enabled, one PSU drops to a low-power sleep state so the active PSU runs at a more efficient operating point. Per the R750 Hot Spare feature documentation: if load on the active PSU falls below 20% of its rated wattage the partner sleeps; if load rises above 50% the partner wakes. The sleeping unit monitors the active PSU's output and re-activates instantly on a sag. So if you glance at iDRAC and see one R750 PSU drawing almost nothing, that is Hot Spare working as designed — not a dead supply. It adds no redundancy beyond 1+1; it is purely an efficiency tweak.

The 200–240 V requirement and low-line derating

This is where North American field deployments get bitten. On a standard 120 V branch circuit, most of the higher-wattage R750 PSUs cannot deliver their rated output — and the Titanium HLAC units will not power on at all.

PSU	High-line (200–240 V) output	Low-line (100–120 V) output	Capacity lost on 120 V
800 W Platinum	800 W	800 W	None (autoranging)
1100 W Titanium	1,100 W	1,050 W	50 W (~5%)
1400 W Platinum	1,400 W	1,050 W	350 W (~25%)
2400 W Platinum	2,400 W	1,400 W	1,000 W (~42%)
700 W Titanium	700 W	Does not operate	200–240 V only
1800 W Titanium	1,800 W	Does not operate	200–240 V only
2800 W Titanium	2,800 W	Does not operate	200–240 V only

The takeaways that matter to real orders: on a 120 V branch, the only R750 PSU that keeps its full rating is the 800 W Platinum (autoranging). The mainstream 1400 W Platinum loses 350 W on 120 V, dropping to 1,050 W — so a drive-dense build that peaks near 1 kW has almost no headroom on low line. The 2400 W Platinum effectively halves to 1,400 W; a "2400 W" spec on a 120 V rack is really a 1,400 W supply. Every Titanium HLAC unit (700 / 1800 / 2800 W) is 200–240 V only, and the 2800 W additionally uses a C22 inlet, so the PDU and cable must match.

Practical rule: a 120 V branch circuit effectively caps a redundant R750 at the 800 W (full) or 1400 W-derated-to-1,050 W tier. Anything needing more than ~1,050 W of real redundant headroom, and any Titanium PSU, needs 208/240 V. When you size the circuit itself, work from input current, not output watts: approximate max input current ≈ low-line output W ÷ efficiency ÷ line voltage. A 1400 W Platinum delivering its 1,050 W low-line max at ~92% efficiency on 120 V pulls about 9.5 A; on 208 V the same output pulls about 5.5 A. Size breakers and PDU off that input current.

Which PSU should you order? An R750 sizing framework

Match your worst-case draw (from the estimate table) to a single-PSU rating with headroom for redundancy and growth, then confirm your input voltage supports it. The matrix below is the starting point; drop back to the estimate table for the actual watts.

Configuration	Est. peak draw	Recommended PSU (Full Redundancy)	Voltage needed
Single-socket, low-TDP, few drives	~200–260 W	800 W Platinum	120 V or 208/240 V
Dual-socket, low/mid-TDP, 8–12 drives	~430–720 W	800 W Platinum (light) to 1400 W Platinum (headroom)	120 V (1400 W derates to 1,050 W) or 208/240 V
Dual-socket, high-TDP, 16–24 NVMe	~850–1,050 W	1400 W minimum; 2400 W for FR transient headroom	208/240 V recommended
GPU / AI (up to 2 × 300 W GPU)	~1,450–1,700 W	2400 W Platinum	208/240 V required (2400 W derates to 1,400 W on 120 V)

GPU configs have hard requirements. The base R750 supports up to two double-width 300 W GPUs — 600 W of accelerator board power before CPUs and drives — and Dell recommends redundant 1100 W-or-higher PSUs for GPU builds. At the two-GPU-plus-dual-8380 end that means the 2400 W tier on 208/240 V, since it derates to 1,400 W on 120 V, below the config's peak: a GPU R750 on a 120 V circuit is a non-starter. Denser accelerator counts move to the dedicated R750xa variant, a separate quote-only SKU.

R750 heat output and cooling: read the BTU number correctly

The heat-ceiling column in the PSU table above is a rating-derived worst case, not your actual heat load. For cooling and CRAC planning, use actual draw instead:

• Watts to BTU/hr: 1 W = 3.412 BTU/hr. A server drawing 400 W at the wall sheds about 1,365 BTU/hr; one pulling 700 W sheds about 2,388 BTU/hr — far below any high-wattage PSU's nameplate ceiling.
• Count only the actively-drawing PSU. In a 1+1 pair (especially with Hot Spare), one PSU carries the load and the other is idle or asleep. Cooling load is 1 × actual draw, not 2 × the nameplate.
• Multiply by real utilization. Take the typical-draw estimate for your config, convert to BTU/hr, and size cooling off that. Summing two PSUs' nameplate BTU can over-provision CRAC capacity several times over — the single most common heat-planning mistake.

What an R750 costs to run: an evergreen formula

Energy cost depends on your draw, your run hours, and your local electricity rate, so use a formula rather than a fixed number:

Annual energy cost = average draw (kW) × 8,760 hours × your local $/kWh

Worked example (for illustration — substitute your local utility rate): a dual-socket R750 averaging 0.45 kW, running continuously, at an illustrative $0.15/kWh:

0.45 kW × 8,760 h × $0.15/kWh ≈ $591 per year

Two adjustments make it accurate for your site. First, multiply by your facility's PUE (power usage effectiveness) to include cooling and distribution overhead — a PUE of 1.5 makes the example roughly $887/year all-in. Second, efficiency tier matters most at light load. Per the 80 PLUS 230 V Internal Redundant standard:

Load point	Platinum (230 V redundant)	Titanium (230 V redundant)
10%	not certified	90%
20%	90%	94%
50%	94%	96%
100%	91%	91%

This is the R750's real efficiency story. Unlike the R740 — whose only factory Titanium was the 750 W unit — the R750 offers Titanium factory across the range (700 / 1100 / 1800 / 2800 W). Titanium is the only tier certified at 10% load and reaches 96% at 50% load versus Platinum's 94% — exactly the light, always-on band a redundant server lives in. The trade-off: the 700 / 1800 / 2800 W Titanium units run on 208/240 V only. The one Titanium we stock for the platform is the 2800 W Titanium PSU.

R750 vs R740 vs R760 power efficiency

Buyers cross-shopping 14th-, 15th-, and 16th-generation Dell 2U servers ask the same thing: how much more efficient is newer? Principled Technologies measured it on a common workload with an external power meter.

Server	Generation	Performance per watt (Ops/s per watt)	vs R740	vs R750
R740	14th (Cascade Lake)	62,179	baseline	—
R750	15th (Ice Lake)	70,698	+13.7%	baseline
R760	16th (Sapphire Rapids)	77,265	+24.3%	+9.3%

The plain reading: the R750 does about 13.7% more work per watt than the R740, and the R760 adds about 9.3% on top of the R750. The R750 is the performance-and-efficiency step up from the R740's value platform; the R760 is the further upgrade when a workload is genuinely power-bound. If the 14th-generation platform is the one you are actually pricing, the Dell PowerEdge R740 buying guide covers where it stands on end of life and what to check before buying. For the older platform's full breakdown, see our R740 power consumption guide. When you are ready to compare live configurations, browse Dell PowerEdge servers across generations.

Frequently asked questions

How many watts does a Dell PowerEdge R750 use?

It depends on configuration. Estimated from component TDP plus platform overhead, an R750 runs from about 90–120 W idle in a light single-socket build to roughly 850–1,050 W peak in a dual-socket, top-bin (2 × 270 W Xeon) build with many NVMe drives, and 1,450–1,700 W with two 300 W GPUs. Independent same-generation testing of the R750xd (not the base R750) by VirtualBytes measured 360–390 W idle and ~503 W peak on dual Xeon Gold 6342 with 1 TB RAM and 4 NVMe — a useful anchor for a heavy build.

What is the idle power consumption of a Dell R750?

Roughly 90–340 W at idle depending on socket count, DIMM count and density, and drive type — about 90–120 W for an entry single-socket build and 230–340 W for a loaded dual-socket build (calculated estimate). Idle scales with memory density: VirtualBytes' 1 TB-LRDIMM R750xd idled at 360–390 W, higher than a same-CPU RDIMM build, because 128 GB LRDIMMs draw far more at idle. A generic "120 W idle" figure applies only to a single-CPU config, not a real dual-Ice-Lake server.

What power supply options does the Dell PowerEdge R750 have?

Factory AC options are 800 W, 1400 W, and 2400 W Platinum, plus 700 W, 1100 W, 1800 W, and 2800 W Titanium (plus an 1100 W −48 V DC unit for telco). All are hot-plug, up to two, with 1+1 redundancy. The 700 W, 1800 W, and 2800 W Titanium units are 200–240 V only; the 800 / 1100 / 1400 / 2400 W units autorange but derate on 120 V. Source: Dell R750 Technical Specifications.

What PSU do I need for a Dell R750 with dual CPUs and NVMe drives?

A dual high-TDP (2 × 205–270 W) build with 16–24 NVMe drives peaks around 850–1,050 W (estimate). For Full Redundancy — where usable budget equals one PSU's rating — Dell recommends the 2400 W over the 1400 W, because transients on a loaded dual-Ice-Lake build can exceed 1,400 W. On a 120 V circuit the 2400 W derates to 1,400 W, so drive-dense or GPU builds should run on 208/240 V.

Does the R750 2400 W or 1400 W PSU derate on 110–120 V power?

Yes. On low line (100–120 V), the 2400 W Platinum drops to 1,400 W and the 1400 W Platinum drops to 1,050 W (a 350 W loss); the 1100 W Titanium drops to 1,050 W. Only the 800 W Platinum keeps its full rating on 120 V. The 700 W, 1800 W, and 2800 W Titanium units do not operate on 120 V at all — they require 200–240 V. Source: Dell R750 Technical Specifications.

What is the BTU/hr heat output of a Dell R750?

Compute it from actual draw, not the PSU nameplate: BTU/hr = wall draw (W) × 3.412. A server pulling 400 W sheds about 1,365 BTU/hr; one pulling 700 W sheds about 2,388 BTU/hr. In a redundant pair (especially with Hot Spare), count only the actively-drawing PSU, not both nameplates. Dell's published per-PSU heat figure is a rating-derived ceiling that assumes full PSU output, which a real server rarely reaches.

What is the difference between FR, FTR, and Non-Redundant PSU modes, and what is Hot Spare on the R750?

Full Redundancy (FR): one PSU can carry the whole load including transients if the other fails, so usable budget equals one PSU's rating. Fault Tolerant Redundancy (FTR): allows a smaller PSU pair and actively manages load if redundancy is lost, avoiding shutdown. Non-Redundant (1+0): one PSU, or two summed with no failover. Hot Spare puts one redundant PSU to sleep below 20% load and wakes it above 50%, keeping the active PSU at a more efficient operating point — it adds no redundancy beyond 1+1. Source: Dell R750 Installation and Service Manual.

Is the R750 available with 80 PLUS Titanium power supplies?

Yes — and unlike the R740 (factory Titanium only at 750 W), the R750 offers Titanium across the range: 700 W, 1100 W, 1800 W, and 2800 W factory. Titanium reaches 96% efficiency at 50% load and is certified at 10% load, versus Platinum's 94% at 50% and no 10%-load certification — the biggest gain is on lightly loaded, always-on servers. Note the 700 / 1800 / 2800 W Titanium units run on 200–240 V only.

How much does it cost to run a Dell R750 per year?

Use annual cost = average draw (kW) × 8,760 hours × your local $/kWh, then multiply by your facility PUE for cooling and distribution overhead. For illustration only (substitute your own rate): a server averaging 0.45 kW at $0.15/kWh is about $591/year before PUE; at a PUE of 1.5, about $887/year all-in. Titanium PSUs trim a few points at light load, which compounds on always-on hardware.

Is the R750 more or less power-efficient than the R740 or R760?

More efficient than the R740, less than the R760. Principled Technologies measured 62,179 Ops/s per watt (R740), 70,698 (R750), and 77,265 (R760) — the R750 does about 13.7% more work per watt than the R740, and the R760 adds about 9.3% on top of the R750. The R750 is the performance-and-efficiency step up from the R740's value platform; the R760 is the further upgrade when a workload is power-bound.

If you are sizing PSUs or planning power and cooling for a specific R750 configuration, our team runs this math every day — send us your configuration and we will return a sized recommendation with availability on the matching refurbished PSU. Or browse R750-compatible power supplies and configure a Dell PowerEdge R750 CTO server directly.