Galaxy Book6 Pro Leak Unwraps Intel Panther Lake: 12 Cores, Xe3 GPU & 32 GB RAM

Galaxy Book6 Pro Leak: First Real-World Look at Intel Panther Lake Power

An innocuous Geekbench upload has lifted the lid on Samsung’s upcoming Galaxy Book6 Pro—and, by accident, given us the most detailed preview yet of Intel’s next-gen Core Ultra Series 3 “Panther Lake” processors. From core counts to AI scores, here is everything the spill uncovered.

1. The Benchmark That Broke the Silence

On 30 October 2025 a Samsung device codenamed “Galaxy Book6 Pro” appeared in Geekbench’s AI 1.4.0 database, running an unannounced Intel Core Ultra 5 338H chip. The listing—quickly removed but cached by several outlets—confirms Samsung will skip Lunar Lake’s successor cycle and jump straight to Panther Lake for its 2026 flagship laptops.

2. Panther Lake Architecture at a Glance

Built on Intel’s 18A (1.8 nm-class) node, Panther Lake introduces RibbonFET gate-all-around transistors for higher drive current and lower leakage, plus PowerVia back-side power delivery to reduce IR-drop and boost frequency. The design uses a tri-tile layout: a CPU compute tile fabbed on Intel 3, a GPU tile on TSMC N3E, and an I/O extender tile.

3. Core Ultra 5 338H Inside the Galaxy Book6 Pro

The leaked machine carries a hybrid 12-core stack: four high-performance Cougar Cove P-cores, four energy-saving Darkmont E-cores, and four low-power E-cores. Base clock is 1.9 GHz with a 4.7 GHz boost, backed by 8 MB of memory-side cache. Graphics come from the new Arc B370 iGPU with four Xe3 compute units and four ray-tracing units, while an NPU 5 block is rated at 50 TOPS for on-device AI. Samsung pairs the processor with 32 GB of LPDDR5X memory and targets a 15–28 W power envelope, keeping the laptop in the ultra-light category but with higher frequencies and more GPU headroom than today’s Lunar Lake parts.

4. Early AI & Compute Scores

Because the benchmark ran ONNX on the CPU, results are conservative: 4,136 in single-precision, 1,764 in half-precision and 7,612 in quantised tests. Even so, the Ultra 5 338H outpaces Lunar Lake’s Core Ultra 7 258V by 12–18% in CPU-bound AI workloads, hinting at healthy IPC gains once GPU and NPU paths are enabled.

5. Bigger Batteries, Two Sizes

Samsung will ship the Galaxy Book6 Pro in 14-inch and 16-inch flavours. Battery capacity grows to 65.9 Wh for the smaller model and 76.6 Wh for the larger one—modest bumps over the Book5 Pro that should offset Panther Lake’s higher TDP ceiling and feed the Xe3 GPU during creative workloads.

6. What This Means for Buyers

Expect roughly eight to ten percent faster CPU performance and about twenty percent quicker graphics than the Book5 Pro in real apps once drivers mature. Early firmware points to ten-to-twelve-hour video playback, matching Lunar Lake despite the watt-up. With a 50 TOPS NPU, next-year Windows Studio Effects and Recall features should run fully on-device. Support for DDR5-6400 and PCIe 5 leaves headroom for 2026 GPU docks and high-speed SSDs.

7. Launch Road-Map & Pricing Rumours

Intel plans a soft launch of Panther Lake-U and -H chips in December 2025, followed by a CES 2026 blow-out. Samsung traditionally unveils Galaxy Books one day ahead of the show; insiders tip a starting price of €1,499 for the 14-inch Book6 Pro with 16 GB and 512 GB, climbing to €1,899 for the 32 GB and 1 TB 16-inch model.

Bottom Line

The Galaxy Book6 Pro leak confirms that Panther Lake is real, booting and already beating Lunar Lake in early benchmarks. While we still need full GPU and NPU numbers to crown a definitive winner, Samsung’s decision to fast-track Intel’s 18A silicon gives the 2026 Pro line a legitimate performance and AI edge—provided thermals and retail pricing stay within reason.

Sources

• SamMobile – Galaxy Book 6 Pro key hardware details leak

• XDA Developers – Intel Panther Lake CPU: Architecture, specs and a 2026 outlook

• Overclock3D – Intel Core Ultra 300 “Panther Lake” CPUs and clock speeds leak

• PCMag – Inside “Panther Lake”: What to Know About Intel’s Crucial First 18A Processors

• TechNetBooks – Samsung Galaxy Book6 Pro Leak Reveals Intel Panther Lake

• VideoCardz – Samsung Galaxy Book6 Pro to feature Core Ultra 5 338H Panther Lake CPU

• Wccftech – Samsung Galaxy Book6 Pro With Intel Core Ultra Series 3 “Panther Lake” CPU Leak

• Notebookcheck – Samsung Galaxy Book6 Pro shines in early benchmarks thanks to Intel Panther Lake and 32 GB RAM