AMD's Ryzen mobile processors have long been a staple in the laptop market, appearing in roughly one-third of all productivity laptops sold today. The company's latest offering, the Ryzen AI 400 series, promises improved performance and efficiency, but recent real-world battery tests tell a different story. For users who prioritize long battery life, the results are far from encouraging.

Testing Methodology: Streaming Video for Realistic Results

Traditional battery benchmarks often rely on looping a locally stored video file, which doesn't accurately reflect modern usage patterns. Streaming video, on the other hand, keeps the screen, processor, and Wi-Fi radio active simultaneously. To better measure real-world endurance, a new test was designed: streaming episodes of the anime One Piece on repeat until the laptop shuts down. This approach simulates a common scenario for users who watch content online.

The test laptop was an Acer Swift Go 14 AI equipped with AMD's Ryzen AI 7 445 processor—a midrange chip with six cores and twelve threads. The display was set to a fixed brightness, and the Wi-Fi connection remained active throughout.

The Contenders: A Mix of Laptops and Processors

The competition included a variety of laptops with different processors and battery capacities, all tested under identical conditions:

• Acer Swift Go 14 AI – Ryzen AI 7 445, 1920×1200 display, 65Wh battery
• Asus Zenbook S16 – AMD Ryzen AI 9 365, 2880×1800 display, 78Wh battery
• Asus Zenbook Duo – Intel Core Ultra X9 388H, 2880×1800 display, 99Wh battery
• Asus Zenbook S 14 – Intel Core Ultra 7 258V, 2880×1800 display, 72Wh battery
• Microsoft Surface Laptop 7 – Qualcomm Snapdragon X Elite, 2304×1536 display, 54Wh battery
• Asus Zenbook A16 – Snapdragon X2 Elite Extreme X2E94100, 2880×1800 display, 73Wh battery

Among these, the Ryzen AI 7 445 sits at the bottom of AMD's processor stack, but it represents the entry point for many mainstream laptops. The test results would be critical for budget-conscious buyers.

Raw Battery Life Results: AMD at the Bottom

The streaming test produced a clear hierarchy. The Intel Core Ultra 9 388H, with its massive 99Wh battery, led the pack with the longest runtime. However, battery capacity differed significantly across devices, so raw runtime alone doesn't tell the whole story.

When adjusted for efficiency—dividing the total battery life by the battery capacity in watt-hours—the results shifted dramatically. The Qualcomm Snapdragon X Elite emerged as the efficiency champion, delivering the best runtime per watt-hour. Intel's Core Ultra series, despite smaller batteries in some configurations, also outperformed AMD's offering. The Ryzen AI 7 445 ranked last on both raw battery life and efficiency, trailing even its own predecessor in some cases.

Historical Context: AMD's Mobile Processor Journey

AMD entered the mobile processor market with its Ryzen series in 2017, quickly gaining a reputation for strong multi-core performance and competitive pricing. However, battery efficiency has remained a challenge. The company's early Ryzen mobile chips often fell short of Intel's offerings in power consumption, requiring larger batteries to achieve similar runtimes. With the Ryzen AI 400 series, AMD aimed to close that gap by integrating dedicated AI accelerators and optimizing the architecture for low-power tasks.

Yet the streaming test suggests that significant work remains. The Snapdragon X Elite, based on ARM architecture, demonstrates what is possible with a design focused on efficiency from the ground up. Intel's Core Ultra series, built on the Lunar Lake architecture, also benefits from extensive power optimizations. AMD's x86 roots may be holding it back in this regard.

Implications for Laptop Buyers

With the Ryzen AI 400 series appearing in mainstream productivity laptops from Acer, Lenovo, HP, and others, the poor battery results are concerning. A separate review of the Lenovo IdeaPad 5a 2-in-1, which uses the same processor, noted that it delivered adequate performance but was let down by poor battery life. The headline of that review summed it up: "A good laptop with a slow CPU."

For users who frequently work on the go, every hour of battery life matters. The Ryzen AI 7 445 may be fine for light tasks, but heavy streaming or multitasking will drain it quickly. Competitors from Intel and Qualcomm offer better endurance, often without requiring larger, heavier batteries.

Looking Ahead: AMD's Roadmap

AMD has not publicly commented on these test results, but the company's future mobile processors—codenamed "Strix Point" and beyond—are expected to refine the power efficiency. In the meantime, laptop manufacturers may need to pair AMD chips with larger batteries to remain competitive, but that adds cost and weight. The Snapdragon X2 Elite, tested in the Asus Zenbook A16, showed improvement over its predecessor but still lagged behind the original Snapdragon X Elite, suggesting that efficiency gains are incremental.

Intel, meanwhile, is preparing its next-generation "Wildcat Lake" platform aimed at budget devices, which could further raise the bar for battery life. For now, AMD's Ryzen AI 400 series seems to be a step backward in a market that increasingly values longevity over raw performance.

Source:PCWorld News