Quick answer- Tom's Hardware found that GaN chargers are worth the modest extra cost and that chargers under 67W held full output in its 30-minute test.
- Match the charger to the device: Apple lists 40W or higher for the fastest wired charging on iPhone 17 models and 30W or higher for MagSafe.
- All three 140W chargers Tom's Hardware tested throttled under load, while its favorite 110W model held full output.
The charger in the box is fine until you lose it, buy a laptop, or want to charge several devices from one outlet. Then wattage, ports, and protocols start to matter.
This guide explains what GaN means, how much power your devices actually need, which chargers performed well in Tom's Hardware testing, and why some high-wattage models slow down under load. It ends with a short buying checklist and a reminder to check current prices before you order.
1. What GaN means and whether it matters
GaN stands for gallium nitride. Tom's Hardware says the material debuted in chargers in 2018 and allows more efficient, cooler, and smaller designs than older silicon chargers, which lets makers pack more watts into a compact body. Its writer sums up the question of whether GaN is worth paying for with a plain yes, with the main drawback being a higher price.
Tom's Hardware also explains the labels you will see on packaging. USB Power Delivery, or USB-PD, is the broadly compatible standard and runs up to 240W over USB-C.
PPS, or Programmable Power Supply, is part of USB-PD 3.0 and adjusts voltage and current on the fly to reduce conversion loss and heat. Quick Charge is Qualcomm's vendor-specific protocol, while FCP and SCP are Huawei's.
On efficiency, most chargers Tom's Hardware tested sat between 89 and 93 percent. The older Samsung 15W model scored 85 percent and the Belkin 20W scored 86 percent.
Idle draw was small: about 0.3W without a screen and closer to 1W with one. At 17 cents per kWh, Tom's Hardware calculates a constant 1W load for 30 days costs just over 12 cents.
My take (20 years in IT): Check the wattage your device actually needs before buying a bigger charger. Extra watts that your phone cannot use do not make it charge faster.
2. How many watts do you need?
The right wattage depends on the device, and manufacturers publish the numbers. Apple's fast-charging page, updated September 18, 2026, says iPhone 17, 17 Pro, and 17 Pro Max can reach 50 percent in around 20 minutes with a 40W adapter or higher.
For iPhone 17e and iPhone Air, a 20W adapter or higher reaches 50 percent in around 30 minutes. For iPhone 18 Pro models, Apple names its 40W Dynamic Power Adapter with 60W Max, or a comparable third-party 60W-capable adapter that uses Adjustable Voltage Supply and supports USB-PD 3.2.
For wireless charging, Apple says iPhone 16, iPhone 17, and iPhone Air need a MagSafe Charger and an adapter of 30W or greater. Apple also accepts comparable third-party USB-C adapters that support USB-PD.
Laptops need more. Anker's own charger guide, a manufacturer source dated August 18, 2026, says a 67W output charges most 13 to 14 inch laptops fast.
Check your laptop's label or support page for its wattage. Tom's Hardware notes that most modern electronics are smart enough to reject the wrong voltage, so a higher-rated charger is generally not a problem.
For households charging several devices at once, add up the wattage of each device and leave some headroom.
3. Chargers that did well in testing
Tom's Hardware tested 20 chargers from 15W to 140W for sustained output, temperature, efficiency, and idle draw. It tracked output over 30 minutes using a 240W-rated cable. The prices below were listed at publication on June 11, 2026, and have likely changed.
| Group | Tom's Hardware favorite | Why |
|---|
| 100W to 140W | Cuktech 10 Ultra, 110W, $59.99 | Held full output and gave the best balance of price, features, and temperature |
| 45W to 68W | Anker Nano, 45W, about $30 | Kept output, ran cool, and was the most efficient tested |
| 15W to 30W | Ugreen 30W, under $14 | Full output over time and the coolest 30W model |
Other outlets point to similar classes. CNN Underscored, in a February 27, 2026 guide, reported a close race between the Belkin 45W BoostCharge Pro Dual USB-C GaN charger and the Mophie Speedport 45W. Android Authority named the Anker Prime 100W GaN its best multiport charger, listed at an MSRP of $84.99 in its November 2025 update.
Narrowing it down? Prices and availability change often, so check the current listing.
65W USB-C chargers → 4. Why some chargers slow down
Heat is the main limit. Tom's Hardware found that charging at full wattage for a long time can push small plastic bodies past their ability to shed heat, so some chargers throttle.
In its test, all three 140W chargers throttled. The Anker Prime 140W held the most, delivering 118W at 30 minutes at a peak of 67.2 degrees Celsius.
The Baseus Enerfill dropped the most, to 88W at 76.4 degrees, and the Sharge Pixel held 99W.
Among chargers around 100W, the Anker Prime 100W fell from 99W to 89W and the Belkin BoostCharge Pro 112W dropped from 101W to 71W after 15 minutes. The Baseus Enercore 100W and the Cuktech 10 Ultra held full output with temperatures in the 63 to 65 degree range.
Chargers rated 45W to 68W did not throttle at all, and Tom's Hardware saw full output from even the cheapest chargers under 67W. Its conclusion is that even the newest chargers can throttle when they are asked for everything at once, but they still charge, only more slowly.
5. A practical buying checklist
Tom's Hardware concludes that picking the right charger is not as complicated as it seems, and that in a pinch even a cheap one will charge a device if the output is appropriate. A few habits still help.
- Match the wattage to the device. Use the manufacturer's page, such as Apple's fast-charging page for iPhones.
- Count the ports. Multiport chargers list a total output and a per-port maximum, as Android Authority's spec tables show, so check what each port delivers when several are in use.
- Look for USB-PD. It is the most universal protocol. PPS adds finer voltage adjustment, which Tom's Hardware says lowers conversion loss and heat.
- Check protections and certifications. Tom's Hardware looks for overvoltage and overcurrent protection and marks such as UL or CE.
- Use a good cable. A cable rated for the wattage matters, and Tom's Hardware tested with a 240W-rated cable.
- Check the price. Compare the current listing at a retailer, since the figures here are from the dates given.
If you already own a charger that meets your device's stated wattage, you do not need to replace it.
My take (20 years in IT): The throttling result for the 140W models is a useful reminder that bigger numbers on the box are not a guarantee. Look at tested output under load, not just the label.
Frequently Asked Questions
Is a GaN charger worth the extra cost?
Tom's Hardware says yes. GaN allows smaller, cooler, more efficient chargers, with the trade-off being a higher price than older designs.
Can I use a non-Apple charger with my iPhone?
Apple's fast-charging page says a comparable third-party USB-C adapter that supports USB-PD works, and it lists the wattage to look for by iPhone model.
Do chargers waste power when nothing is plugged in?
A little. Tom's Hardware measured about 0.3W idle for most models and nearer 1W for models with displays, which it calculated at just over 12 cents for 30 days at 17 cents per kWh.
Why does my high-wattage charger slow down?
Tom's Hardware found all three 140W chargers it tested throttled output as they heated up when pushed for 30 minutes, while chargers rated 45W to 68W did not.
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Last updated: October 22, 2026.
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