Samsung 5nm Exynos W920 Chip Galaxy Watch

The Samsung Exynos W920 is the 5nm processor that powers the Galaxy Watch 4 and Galaxy Watch 4 Classic, and it delivers roughly 20% faster CPU performance and double the graphics speed compared to the older Exynos 9110 found in the Galaxy Watch 3. You get this chip when you buy a Galaxy Watch 4 series device, and it enables smoother Wear OS navigation, faster app launches, and better battery efficiency than previous Samsung wearables.

Formula

The calculator works out your average running pace and speed from a finish time and distance. Pace is the time it takes to cover one kilometer (or mile), and speed is the distance covered per hour. The formulas are:

Pace (min/km) = Total time (minutes) ÷ Distance (km)

Speed (km/h) = Distance (km) ÷ (Total time (minutes) ÷ 60)

Variables:
· t = total time in minutes (e.g., 50)
· d = distance in kilometers (e.g., 10)
· pace = minutes per kilometer
· speed = kilometers per hour

Worked Example

Using the default values from the calculator: t = 50 minutes, d = 10 km.

Step 1: Pace = 50 ÷ 10 = 5.00 min/km

Step 2: Speed = 10 ÷ (50 ÷ 60) = 10 ÷ 0.8333 = 12.00 km/h

So a 50-minute 10K means you ran at 5:00 per kilometer, which is 12 km/h.

Why the Exynos W920 Matters

The Exynos W920 is Samsung’s first wearable chip built on a 5nm process. That smaller transistor size means the chip uses less power while delivering more performance. In practice, the Galaxy Watch 4 series feels noticeably snappier than earlier models: swiping between watch faces, opening apps, and using the rotating bezel all respond faster. The chip also includes a dedicated LTE modem, so the cellular version of the watch can handle calls and data without draining the battery excessively.

Another key feature is the dual Cortex-A55 cores (1.18 GHz) paired with a Mali-G68 GPU. While two cores may sound modest, they are optimized for the low-power demands of a smartwatch. The GPU is roughly twice as fast as the one in the Exynos 9110, which makes Wear OS animations and maps smoother. The W920 also supports up to 2GB of RAM, which is what the Galaxy Watch 4 uses to run Wear OS 3 without lag.

How the W920 Compares to Older Samsung Chips

The previous generation, Exynos 9110, was used in the Galaxy Watch Active 2 and Galaxy Watch 3. It was built on a 10nm process and had two Cortex-A55 cores at 1.15 GHz. The W920 improves on that in three ways:

Smaller 5nm process – about 30% better power efficiency
Faster CPU – roughly 20% better single-core performance
Newer GPU – about double the graphics speed

That performance jump is the main reason the Galaxy Watch 4 series could run Wear OS 3 smoothly, while older watches were stuck with the older Tizen OS. If you own a Galaxy Watch 3, you will notice the difference immediately when scrolling through notifications or using the app drawer.

Battery Life and Real-World Usage

With the W920, battery life depends heavily on how you use the watch. In typical mixed use (notifications, heart rate monitoring, occasional GPS), a 40mm Galaxy Watch 4 lasts about 1.5 days, and the 44mm version about 2 days. The 46mm Classic can stretch to 2.5 days. If you enable always-on display, continuous GPS tracking, or LTE streaming, that drops to under a day.

The 5nm chip helps, but the display and GPS are the biggest battery drains. Samsung also includes a power-saving mode that switches to a simpler watch face and disables always-on display, which can extend battery life by several hours in a pinch.

How to Choose a Galaxy Watch 4 Model

All Galaxy Watch 4 models use the same W920 chip, so performance is identical across the lineup. Your choice comes down to size, materials, and LTE. The main options:

Galaxy Watch 4 (40mm or 44mm) – aluminum case, lighter, cheaper
Galaxy Watch 4 Classic (42mm or 46mm) – stainless steel case, physical rotating bezel
LTE vs Bluetooth – LTE lets you leave your phone at home, but costs more and uses more battery

If you want the classic look and the satisfying rotating bezel, choose the Classic. If you prefer a lightweight fitness watch, the standard Watch 4 is fine. Both run the same software and have the same health sensors (heart rate, ECG, blood oxygen, body composition).

Common Problems and Misconceptions

One common misconception is that the Exynos W920 is the same chip used in the Galaxy Watch 5. It is not – the Watch 5 uses the Exynos W920 too, but Samsung did not release a new processor for the Watch 5 series. The W920 remains the chip in both the Watch 4 and Watch 5, which is why performance is nearly identical between those generations.

Another issue some users report is that the watch can get warm during charging or heavy GPS use. That is normal for most smartwatches and not a defect. If the watch becomes uncomfortably hot, stop charging and let it cool down.

Battery drain after software updates is also common. If you notice your Watch 4 battery dropping faster than usual after an update, try restarting the watch, clearing the cache partition, or resetting it. This usually resolves the issue.

Alternatives to the Exynos W920

If you are shopping for a smartwatch and comparing chips, the main alternatives are:

Snapdragon Wear 4100+ – used in some Wear OS watches like the TicWatch Pro 3
Apple S8 chip – used in Apple Watch Series 8 and Ultra
Huawei Kirin A1 – used in Huawei Watch GT series

The Snapdragon 4100+ is comparable to the W920 in performance, but it is built on a 12nm process, so it is less power-efficient. Apple’s S8 is faster and more efficient, but it only works with iPhones. If you have an Android phone, the Galaxy Watch 4 or 5 with the W920 is the best-performing Wear OS option.

Frequently Asked Questions

Does the Exynos W920 support Wear OS 3?

Yes, the W920 was designed specifically for Wear OS 3, and it is the chip used in the Galaxy Watch 4 and Watch 4 Classic. It also powers the Galaxy Watch 5 series, which runs the same operating system.

Is the Galaxy Watch 4 still worth buying in 2024?

Yes, if you can find it at a discount. The Watch 4 still gets software updates and has the same performance as the newer Watch 5. The main difference is the Watch 5 has a slightly larger battery and a temperature sensor, but the core experience is identical.

Can I use the Galaxy Watch 4 with an iPhone?

No. The Galaxy Watch 4 requires an Android phone (Samsung recommends its own Galaxy phones). It does not work with iPhones because Samsung uses Google’s Wear OS, which does not have iOS support.

How long does the battery last on the Galaxy Watch 4?

With the W920 chip, typical battery life is 1.5 to 2 days depending on model and usage. The 40mm version lasts about 1.5 days, the 44mm about 2 days, and the 46mm Classic about 2.5 days. Always-on display and GPS reduce that significantly.

What is the difference between the Exynos W920 and the Snapdragon Wear 4100+?

The W920 is built on a 5nm process, making it more power-efficient than the 12nm Snapdragon 4100+. In benchmarks, the W920 has a faster CPU and GPU, but the Snapdragon 4100+ has four cores instead of two. In real-world use, the W920 feels smoother in Wear OS because it was optimized for that platform.

Formula used

in t | Finish time | min | 50 | 0
in d | Distance | km | 10 | 0 | 100000
out pace | Average pace | min/km | t / d | 2
out speed | Average speed | km/h | d / (t / 60) | 2

Each line is one input (in, sel, list) or one result (out: label, unit, formula, decimals). How the calculators work

Method: the standard formula for this calculation, rounded as each result states. See how the calculators work or report an error.

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