Intel’s Panther Lake CPU Frequencies Leak: Up to 5.1 GHz on 16-Core Flagship

Intel’s upcoming “Panther Lake” mobile processors, part of the Core Ultra Series 3, have seen their specifications and clock speeds leaked ahead of an official launch. The leaks reveal a range of SKUs, with the top-tier Core Ultra X9 388H processor expected to reach a boost clock of 5.1 GHz, featuring a 16-core configuration.

Key Takeaways

• Top Clock Speed: The flagship Core Ultra X9 388H is rumored to hit 5.1 GHz.
• Core Configuration: The highest-end models will feature a 4 P-Core, 8 E-Core, and 4 LPE-Core setup, totaling 16 CPU cores.
• GPU Power: These processors will integrate Xe3 graphics, with top SKUs boasting up to 12 Xe3 cores.
• TDP Range: SKUs are expected to span from 15-28W for U-series to 45W for H-series.
• Performance Concerns: Early benchmark leaks suggest performance may not significantly surpass previous generations.

Panther Lake SKU Details Emerge

Details from reliable leakers indicate that Intel plans to release approximately 14 Panther Lake SKUs across various segments. The processors will utilize a hybrid architecture, combining Performance-cores (P-Cores), Efficient-cores (E-Cores), and Low Power Efficient-cores (LPE-Cores). The top-tier Core Ultra X9 388H is slated to feature 4 P-Cores, 8 E-Cores, and 4 LPE-Cores, achieving a maximum turbo boost of 5.1 GHz. This flagship model will also be equipped with 12 Xe3 GPU cores.

Other H-series SKUs, such as the Core Ultra 386H and X7 368H, will share the same core configuration but operate at slightly lower clock speeds, ranging from 4.8 GHz to 4.9 GHz. The lineup also includes configurations with fewer E-cores, like the 4+4+4 core setup found in the Core Ultra 5 338H and 336H, which will feature 10 Xe3 GPU cores and clock speeds up to 4.7 GHz.

Here is a full list…

4+8+4 Core Configuration:

• Core Ultra X9 388H: 4 P-Cores, 8 E-Cores, 4 LPE-Cores, 5.1 GHz
• Core Ultra 386H: 4 P-Cores, 8 E-Cores, 4 LPE-Cores, 4.9 GHz
• Core Ultra X7 368H: 4 P-Cores, 8 E-Cores, 4 LPE-Cores, 5.0 GHz
• Core Ultra 366H: 4 P-Cores, 8 E-Cores, 4 LPE-Cores, 4.8 GHz
• Core Ultra X7 358H: 4 P-Cores, 8 E-Cores, 4 LPE-Cores, 4.8 GHz
• Core Ultra 356H: 4 P-Cores, 8 E-Cores, 4 LPE-Cores, 4.7 GHz

4+4+4 Core Configuration:

• Core Ultra X5 338H: 4 P-Cores, 4 E-Cores, 4 LPE-Cores, 4.7 GHz
• Core Ultra 336H: 4 P-Cores, 4 E-Cores, 4 LPE-Cores, 4.6 GHz

4+0+4 Core Configuration:

• Core Ultra 365: 4 P-Cores, 0 E-Cores, 4 LPE-Cores, 4.8 GHz
• Core Ultra 355: 4 P-Cores, 0 E-Cores, 4 LPE-Cores, 4.7 GHz
• Core Ultra 335: 4 P-Cores, 0 E-Cores, 4 LPE-Cores, 4.6 GHz
• Core Ultra 325: 4 P-Cores, 0 E-Cores, 4 LPE-Cores, 4.5 GHz

2+0+4 Core Configuration:

• Core Ultra 332: 2 P-Cores, 0 E-Cores, 4 LPE-Cores, 4.4 GHz
• Core Ultra 322: 2 P-Cores, 0 E-Cores, 4 LPE-Cores, 4.4 GHz

Power Efficiency and Graphics

Panther Lake processors will also cater to more mainstream and power-efficient segments. The U-series, designed for thin-and-light devices, will feature TDPs between 15-28W. These models, like the Core Ultra 365 and 325, will have configurations such as 4 P-Cores with 4 LPE-Cores, and will integrate 4 Xe3 GPU cores, with clock speeds reaching up to 4.8 GHz. The entry-level SKUs, such as the Core Ultra 332 and 322, will feature a 2 P-Core and 4 LPE-Core design, also with 4 Xe3 GPU cores and a clock speed of 4.4 GHz.

The integrated Xe3 graphics, based on the Celestial architecture, are expected to offer a significant performance uplift over previous generations, potentially blurring the lines between integrated and entry-level discrete graphics for mobile devices.

Performance Leaks Raise Questions

Despite the promising clock speeds and core counts, early benchmark leaks have cast some doubt on Panther Lake’s performance gains. Some alleged results for the Core Ultra X7 358H and Ultra X5 338H in Cinebench R23 suggest they might perform on par with, or even slightly worse than, their last-generation Arrow Lake predecessors. For instance, the X7 358H with its 16 cores reportedly scored around 20,000 points in the multi-threaded test, while a previous generation chip achieved higher scores within a similar power envelope. These results are based on engineering samples and may not reflect final retail performance, but they do indicate that Panther Lake might prioritize efficiency over raw performance leaps.

Intel is expected to officially unveil the Panther Lake Core Ultra Series 3 CPUs at CES 2026, with availability anticipated in January 2026.

Via @jaykihn0