iPhone 15 Pro Max Performance Review: Speed, Heat & Daily Use
The iPhone 15 Pro Max runs Apple’s A17 Pro — a 6-core CPU and 6-core GPU — in a 221 g titanium body with USB 3 speeds up to 10Gb/s, and that combination is the whole performance story: very fast in bursts, warm under sustained load, and still fast enough in daily use that the laboratory’s stress-test caveats matter more to gamers than to anyone else. Those core counts are manufacturer specifications, and this review keeps them labelled that way. The measured figures it adds are Notebookcheck’s laboratory results for this exact model: Geekbench 6.7 scores of 2,930 single-core and 7,244 multi-core, an AnTuTu v10 total of 1,487,075, stress-test stability down to 65.4% on the hardest test, and surface temperatures up to 45.8 °C under that laboratory’s game load. No benchmark score measured on the smaller iPhone 15 Pro or on any 16-series model is used here.
How This Review Was Researched
This is a desk review. It is based on Apple’s published technical specifications for this model — read from faithful mirrors of Apple’s own specifications text, because Apple’s live specifications page for this discontinued model is not directly readable (specifications checked 15 October 2026, and carried in the verified pack) — on Apple’s published September 2023 launch service fees, and on one named laboratory source for this exact model: Notebookcheck’s review of the iPhone 15 Pro Max (published December 2023), which benchmarked its 256GB test unit and measured its surface temperatures under load. FixUpPhone did not hands-on test an iPhone 15 Pro Max and did not benchmark it. Figures from Apple are labelled manufacturer specifications or manufacturer claims; Notebookcheck’s figures are labelled third-party laboratory measurements wherever they appear, and no figure measured on the smaller iPhone 15 Pro or on any 16-series model is used anywhere in this review.
Methodology note: specifications describe what Apple rates the device to do, and a laboratory measurement describes one tested unit under that lab’s conditions. Neither is presented here as the other.
ϟ Quick Expert Summary
The specification sheet is a flagship sheet of its generation: A17 Pro with a 6-core CPU, 6-core GPU and 16-core Neural Engine (manufacturer specifications), storage in 256GB, 512GB and 1TB with no smaller tier, USB-C with USB 3 up to 10Gb/s (a USB 3 cable is required for those speeds and was sold separately), Wi-Fi 6E, Bluetooth 5.3, Thread and a second-generation Ultra Wideband chip (manufacturer specifications). Notebookcheck’s laboratory recorded Geekbench 6.7 scores of 2,930 single-core and 7,244 multi-core and an AnTuTu v10 total of 1,487,075 for this exact model (third-party laboratory measurements) — roughly a tenth ahead of the previous generation’s single-core laboratory score in the same lab’s comparison. The sustained-load picture is the honest counterweight: the same laboratory’s stress-test stability fell to 78.9% on Wild Life, 65.4% on Wild Life Extreme and 66.1% on Solar Bay (third-party laboratory measurements), and its game-load surface temperatures reached a maximum of 45.8 °C on the upper side and 45.2 °C on the underside at a room temperature of 22 °C (third-party laboratory measurements). Daily use, by contrast, is where this phone is least controversial: fast web benchmarks in the same laboratory (Speedometer 2.0 at 445 runs per minute, third-party laboratory measurement) and a 120Hz ProMotion display mean ordinary tasks are not where this phone is tested. The ownership side is the battery: Apple’s ratings when new are 29 hours of video, 25 hours streamed and 95 hours of audio (manufacturer claims), a battery below 80% maximum capacity is treated by Apple as consumed, and Apple’s September 2023 launch battery fee is $99, or no extra charge with AppleCare+ below 80%.
Source-based editorial guidance, not a hands-on review or a FixUpPhone price quote. Laboratory figures are that lab’s measurements of its test unit, not FixUpPhone results.
✓ Performance Is a Reason to Buy When
- You want flagship burst speed — 2,930 / 7,244 in Geekbench 6.7 in Notebookcheck’s laboratory tests of this model
- You move large files — USB 3 up to 10Gb/s, with a measured SSD copy rate of 857.28 MB/s in Notebookcheck’s laboratory test
- You live in the browser — 445 runs per minute in Speedometer 2.0 in the same laboratory’s tests
- You want a phone whose daily-use speed is not its question — the caveats are about sustained load, not ordinary tasks
× Think Twice When
- You run sustained heavy loads all day — stress-test stability fell to 65.4% on the hardest test in Notebookcheck’s laboratory
- You are heat-sensitive about a phone in the hand — the laboratory measured up to 45.8 °C under game load
- You need Wi-Fi 7 — this model is Wi-Fi 6E, and the next generation is where that arrives
- Your battery is already below 80% — that is Apple’s consumed line, and the $99 launch battery fee is the restoration price
A17 Pro
6-core CPU, 6-core GPU
2,930 / 7,244
Geekbench 6.7, Notebookcheck laboratory
45.8 °C
Maximum upper-side temperature under game load, laboratory
$99
Apple’s September 2023 launch battery fee
Fast in bursts, warm under load.
Both halves are laboratory facts.
Burst benchmarks and stress tests answer different questions — this review prints both, labelled.
① Key Specifications
| Chip | A17 Pro — 6-core CPU, 6-core GPU, 16-core Neural Engine |
|---|---|
| Display | 6.7-inch Super Retina XDR OLED, 2796×1290, 460 ppi, ProMotion up to 120Hz, Always-On, Dynamic Island |
| USB-C | USB 3 up to 10Gb/s; DisplayPort out; a USB 3 cable is required for 10Gb/s speeds and was sold separately |
| Wireless | Wi-Fi 6E (not Wi-Fi 7); Bluetooth 5.3; Thread; second-generation Ultra Wideband |
| Battery ratings, when new | Video up to 29 hours; video streamed up to 25 hours; audio up to 95 hours (manufacturer claims; one set, no regional split) |
| Battery service line | Below 80% maximum capacity Apple treats the battery as consumed |
| Charging claim | Wired up to 50% in around 30 minutes with a 20W adapter or higher (manufacturer claim); MagSafe up to 15W with no separate MagSafe time claim |
| Weight | 221 g (manufacturer specification) |
| Dimensions | 159.9 × 76.7 × 8.25 mm (manufacturer specification) |
| Chip | A17 Pro — 6-core CPU, 6-core GPU, 16-core Neural Engine (manufacturer specification) |
| Storage | 256GB / 512GB / 1TB; there is no smaller tier on this model (manufacturer specification) |
| US launch starting price | $1,199 for 256GB — labelled historical anchor only; this model was discontinued in September 2024 and is not sold new by Apple at that price today |
| Announced / released | 12 September 2023 / 22 September 2023 (manufacturer record) |
| Controls | Action button present; no Camera Control button on this model (manufacturer specification) |
Apple Support — iPhone service and repair; Apple technical specifications for this model (via the verified pack, checked 15 October 2026; Apple’s live specifications page for this discontinued model is not directly readable)
Apple names no modem and no wireless chip for this model, and this review names none. Battery figures are manufacturer claims for a new battery, not measurements of a used unit’s runtime — a used phone’s battery health is a property of that unit, and only its own maximum-capacity reading settles it.
② Performance Deep-Dive
Analysis based on Apple’s published specifications and attributed laboratory sources for this model. No measurement by FixUpPhone is claimed anywhere in this section.
Burst speed, measured on this model
Notebookcheck’s laboratory benchmarked its 256GB iPhone 15 Pro Max test unit and recorded Geekbench 6.7 scores of 2,930 single-core and 7,244 multi-core, an AnTuTu v10 total of 1,487,075 and a CrossMark overall score of 1,408 (all third-party laboratory measurements). In the same laboratory’s comparison table, the previous generation’s phone recorded 2,639 single-core, and Notebookcheck’s own summary puts the single-core improvement at about 10% over that predecessor (that laboratory’s comparison). Graphics benchmarks in the same laboratory tell the same burst story with a qualification: 3DMark Wild Life Extreme scored 3,765 and Wild Life Unlimited scored 15,260 (third-party laboratory measurements), while the laboratory notes that its GFXBench values stagnated at times and even fell in places against the competition — a reminder that a benchmark suite is a set of different tests, not a single verdict. None of these figures is a FixUpPhone result, and none of them is borrowed from a sibling model: the smaller iPhone 15 Pro shares the chip name but is a different phone, and its results are not printed here.
Sustained load and heat: the laboratory’s caveat, stated in full
Sustained load is where this phone’s laboratory record gets careful. Notebookcheck’s laboratory, having no sustained-load benchmark available for its test conditions, used Genshin Impact at the highest detail and frame-rate setting as its load, and reported that the phone’s surface became very warm but never hit any critical values (that laboratory’s account). Its measured surface temperatures under that load reached a maximum of 45.8 °C on the upper side (average 41.4 °C) and 45.2 °C on the underside (average 40.4 °C), at a room temperature of 22 °C, with an idle upper-side average of 34 °C (all third-party laboratory measurements). Its 3DMark stress tests recorded stability of 78.9% on Wild Life, 65.4% on Wild Life Extreme and 66.1% on Solar Bay (third-party laboratory measurements), and the laboratory’s own summary is that the chip is not cooled as effectively as on the previous generation’s phone and suffers severe performance drops under stress. This review prints those stability figures as the laboratory printed them and does not convert them into a single invented throttling percentage: a stability figure is a ratio of sustained to peak performance in that test, and different tests give different ratios. The practical reading is straightforward: short, intense tasks stay fast; long, intense tasks get slower and warmer, and a phone that is already hot — from charging, sunlight or a case that traps heat — will feel that sooner.
Daily use: where the numbers stop mattering
For ordinary daily use, the laboratory’s web benchmarks are the most transferable figures it published: Speedometer 2.0 at 445 runs per minute, Jetstream 2 at 254.048 points and WebXPRT 3 at 304 points (all third-party laboratory measurements, on the laboratory’s Safari build). Those are browser-engine figures, not app-launch timings — this review prints no app-launch timing, because none is published for this model in the laboratory source used. The rest of daily-use speed is specified, not measured: a 120Hz ProMotion display (manufacturer specification) makes scrolling and animation smoother than a fixed-rate panel, and the USB-C port’s USB 3 speeds matter when moving photos and video. Notebookcheck’s laboratory measured an average SSD copy rate of 857.28 MB/s with a connected SSD (third-party laboratory measurement) — a concrete illustration of what the USB 3 specification means in practice, with the caveat that a USB 3 cable is required for those speeds. Storage speed itself is not separately benchmarked in the laboratory source used, and no storage benchmark figure is invented here.
Heat, restarts and the repair ladder
Heat on its own is not a fault: a phone under sustained load gets warm, and the laboratory temperatures above are load temperatures, not idle ones. Heat becomes a repair question when it arrives with symptoms — unexpected restarts, a phone stuck on its logo, rapid battery drain, or a temperature warning that will not clear. Those symptoms have their own diagnostic ladders, and the guides linked in the repair section work through the free checks (software, settings, a faulty app, a degraded battery) before any repair decision. One safety line is absolute and belongs in every performance discussion of a phone this age: if the phone is swollen, stop using and charging it, and never mail a hot or swollen phone. A degraded battery can also masquerade as a performance problem — throttled-feeling daily use on a phone whose battery health is below 80% is a battery question first, and Apple’s September 2023 launch battery fee of $99 (no extra charge with AppleCare+ below 80%) is the cheapest restoration this phone offers.
③ Pros & Cons
✓ Pros
- Flagship burst benchmarks on this exact model — Geekbench 6.7 at 2,930 / 7,244 and AnTuTu v10 at 1,487,075 (Notebookcheck laboratory)
- USB 3 up to 10Gb/s with a measured 857.28 MB/s SSD copy rate in the same laboratory’s test
- Strong web benchmarks — Speedometer 2.0 at 445 runs per minute (Notebookcheck laboratory)
- 120Hz ProMotion display and a 6-core GPU generation that brought hardware ray tracing to this line
× Cons
- Sustained-load stability fell to 65.4% on Wild Life Extreme in Notebookcheck’s stress tests — long heavy loads slow down
- Surface temperatures up to 45.8 °C under the laboratory’s game load — warm in the hand under sustained use
- Wi-Fi 6E, not Wi-Fi 7, and no Camera Control button — both arrive with later generations
- A battery below 80% maximum capacity reads as a performance problem before it reads as a battery problem
The Repair Angle: What Restoring Performance Costs
Performance restoration is usually a battery or a diagnosis, not a chip replacement. Apple’s published September 2023 launch fees frame the cost; FixUpPhone quotes independently after assessment and publishes no fixed price for this model.
| Your route | Published price | What it means |
|---|---|---|
| Apple — battery, no cover | $99 | Apple’s published September 2023 launch out-of-warranty battery fee — 8.3% of the $1,199 launch starting price (calculated). |
| Apple — battery, with AppleCare+ | $0 | No extra charge where capacity is below 80% and a plan is active. |
| Apple — other damage, no cover | $699 | The launch fee where damage falls outside the named rows; with AppleCare+ the service fee is $99. |
| FixUpPhone — diagnosis & repair | Quote after assessment | No fixed price is published. The cause is confirmed first — battery, software or hardware — and work proceeds only after you approve the quote. |
Check Apple’s current iPhone repair terms, fees and coverage routes
Request a diagnosis and an assessed quote for your exact phone
Apple fees below are Apple’s published September 2023 launch figures for this model. Apple’s interactive repair estimator was re-checked at write time on 27 October 2026: the Apple Support repair page renders per-model fees through an interactive selector and no per-model figure was readable in text, so no post-launch revision was found as of October 2026 and the launch figures are headlined as launch figures, not as verified-current figures. Prices and terms can change. None of Apple’s figures is a FixUpPhone price. The full diagnosis and options are in the iPhone 15 Pro Max battery draining fast guide.
④ Repairability & Common Issues
Overheating has a ladder, not a single cause
Sustained load, charging, sunlight, a faulty app and a degraded battery all heat a phone. The overheating guide works through the free checks before any repair decision.
Random restarts point at battery or software first
A phone that restarts on its own is rarely a chip failure. The randomly restarting guide separates software, battery and hardware causes.
Stuck on the logo is a different fault
A phone that will not boot past its logo needs a different ladder from a phone that runs hot. The stuck on logo guide covers the recovery steps and when to seek diagnosis.
After any performance-related work, check the phone under the conditions that showed the problem: sustained use, charging and, where relevant, battery health — then keep the paperwork with the phone. Every FixUpPhone repair includes a 3-month warranty, and the general repair timeframe is 1–7 days. Never mail a hot or swollen phone.
Overheating or Slowing Down on Your iPhone 15 Pro Max?
Tell FixUpPhone what the phone is doing under load and choose a local store or a mail-in enquiry.
- Phone gets hot during games or long video use
- Random restarts or sudden shutdowns
- Phone stuck on the logo and will not boot
- Battery draining fast or health below 80%
An online booking is a request; the team confirms the next step with you.
Mail-In Repair Service
Start with the repair request form and choose Mail-In Repair. You pay to ship the phone to FixUpPhone; FixUpPhone pays the return shipping. Do not send the device until the receiving store and shipping instructions have been confirmed.
Start Mail-In Repair →Back up first where possible. Say what the phone is doing — it speeds up the diagnosis. Never mail a hot or swollen phone. Questions: support@fixupphone.com.
Prefer to visit? Find a repair location →Visit a FixUpPhone Store
Lynwood, CA · 3100 E Imperial Hwy, Store M1002, Lynwood, CA 90262 · Every day 11 AM–8 PM · (805) 857-4225
Santa Barbara, CA · 619 A State St, Santa Barbara, CA 93101 · Mon–Fri 11 AM–8 PM; Sat 10 AM–8 PM; Sun 12 PM–7 PM · (805) 857-4226
Las Vegas, NV · 875 S Grand Central Pkwy, Unit TT32, Las Vegas, NV 89106 · Mon–Sat 10 AM–8 PM; Sun 10 AM–7 PM · (818) 482-3605
How It Works
- BookSubmit the model, store or mail-in choice, and symptoms for review.
- DiagnoseThe team confirms what is at fault.
- ApproveReview the finding and confirmed quote before authorising work.
- RepairThe general repair timeframe is 1–7 days, plus shipping time for mail-in.
- Collect or ReturnCollect in store or receive the mail-in return; repairs include a 3-month warranty.
⑤ Who Should Buy It — and Who Should Skip
This is a fast phone with a documented sustained-load caveat, not a slow phone and not a phone without limits. Buy it for burst speed and daily use; budget for heat management and, on a used unit, for a battery.
| Reader | Verdict | Why |
|---|---|---|
| Everyday users and browsers | Buy | Burst speed and web benchmarks in the laboratory’s tests leave ordinary tasks unstressed. |
| Photo, video and file movers | Buy | USB 3 speeds and the 6-core GPU generation serve exactly this use. |
| Sustained heavy-load users | Check first | Stress-test stability down to 65.4% and 45.8 °C load temperatures are the honest caveats. |
| Used buyers | Check the battery first | Below 80% maximum capacity, the $99 launch battery fee is the first performance restoration to price. |
⑥ Alternatives & Comparison
Newer chips and cooling generations raise sustained performance — at current-model prices.
Explore option →If your current phone is fast enough for your daily tasks, the upgrade case rests on more than burst benchmarks.
Explore option →Price the battery before pricing a replacement — the full numbers are in the battery draining guide.
Explore option →⑧ Frequently Asked Questions
How fast is the iPhone 15 Pro Max?
Notebookcheck’s laboratory recorded Geekbench 6.7 scores of 2,930 single-core and 7,244 multi-core and an AnTuTu v10 total of 1,487,075 for this exact model (third-party laboratory measurements). Apple’s specification is the A17 Pro with a 6-core CPU and 6-core GPU.
Does it slow down under sustained load?
Yes, measurably, in laboratory stress tests: Notebookcheck recorded stability of 78.9% on Wild Life, 65.4% on Wild Life Extreme and 66.1% on Solar Bay (third-party laboratory measurements). This review does not convert those figures into a single invented throttling percentage.
How hot does it get?
Under Notebookcheck’s game load, surface temperatures reached a maximum of 45.8 °C on the upper side and 45.2 °C on the underside, at a room temperature of 22 °C (third-party laboratory measurements). Idle, the upper-side average was 34 °C in the same laboratory.
Does it have Wi-Fi 7?
No. This model is Wi-Fi 6E (manufacturer specification). Wi-Fi 7 arrives with the next generation.
What does a battery replacement cost through Apple?
Apple’s published September 2023 launch out-of-warranty battery fee for this model is $99, or no extra charge with an active AppleCare+ plan where capacity is below 80%. No post-launch revision was found as of October 2026.
Is a hot phone a fault?
Not on its own. Sustained load warms any phone. Heat becomes a repair question when it arrives with restarts, a stuck logo, rapid drain or a temperature warning that will not clear — work through the linked guides’ free checks first.
What if the phone is swollen?
Stop using and charging it, do not puncture or press it, and never mail a hot or swollen phone. Seek a diagnosis in store.
Where can FixUpPhone check my phone’s performance?
At the Lynwood, Santa Barbara or Las Vegas stores, or by mail-in after instructions are confirmed. An online booking is a request the team confirms; the general repair timeframe is 1–7 days and repairs include a 3-month warranty.
Sources & Editorial Notes
Prepared by FixUpPhone Editorial. Documentation checked October 2026. Apple specifications and service fees are distinguished from the third-party laboratory measurements cited and from FixUpPhone’s assessed repair process. No hands-on testing, measurement, customer experience or fixed FixUpPhone price is claimed for this model. The featured artwork is an original illustration. Apple is not affiliated with FixUpPhone; Apple’s specifications and fees are included only as a public reference.
- Apple — iPhone 15 Pro Max technical specifications (via faithful mirrors of Apple’s specifications text, checked 15 October 2026 — A17 Pro core counts, storage, USB 3 up to 10Gb/s, DisplayPort, Wi-Fi 6E, Bluetooth 5.3, Thread, second-generation Ultra Wideband, battery ratings, charging claims, 221 g — manufacturer specifications and claims). Apple names no modem and no wireless chip for this model.
- Notebookcheck — Apple iPhone 15 Pro Max review and laboratory tests (published December 2023; page read at write time, October 2026) — Geekbench 6.7 at 2,930 / 7,244, AnTuTu v10 at 1,487,075, CrossMark at 1,408, 3DMark Wild Life Extreme at 3,765 and Unlimited at 15,260, stress-test stability at 78.9% / 65.4% / 66.1%, game-load surface temperatures up to 45.8 °C upper and 45.2 °C underside at 22 °C room temperature, idle upper average 34 °C, Speedometer 2.0 at 445 runs per minute, Jetstream 2 at 254.048, WebXPRT 3 at 304, SSD copy rate 857.28 MB/s (third-party laboratory measurements of Notebookcheck’s 256GB test unit).
- Apple Support — iPhone service and repair (inspection determines the final fee; battery consumed below 80%; AppleCare+ terms; page re-checked 27 October 2026 — per-model fees render through an interactive selector and no per-model figure was readable in text)
- Apple’s published US service fees for this model, September 2023 launch figures (battery $99; other damage $699; AppleCare+ battery $0 below 80%, other $99) — no post-launch revision found as of October 2026
- FixUpPhone — Phone Repair Services and Mail-In Phone Repair, checked October 2026
- FixUpPhone — Locations, checked October 2026
For corrections or device help, contact FixUpPhone.