Leaked Intel Panther Lake-H “25W” & Panther Lake-U “15W” CPUs: Core Ultra 300 Featuring Up To 16 Cores and 12 Xe3 GPU Cores

Recent leaks have unveiled key details about Intel’s upcoming Panther Lake-H and Panther Lake-U CPUs, outlining their core configurations and performance capabilities.

Intel’s Panther Lake-H and Panther Lake-U CPUs: A Look Ahead

Set to debut in late 2025, the Panther Lake-H series, featuring up to 16 cores, alongside the Panther Lake-U with a maximum of 8 cores, has been generating buzz among tech enthusiasts and developers alike. Intel previously showcased these processors at Computex 2023, offering a glimpse into what is now referred to as the Core Ultra Series 3 or the Core Ultra 300.

New specifications have been disclosed on platforms like CoreBoot, with insights from leaker @InstLatX64. While specific WeU names have not been confirmed, configurations for the PTL-H (Panther Lake-H) series have emerged, thanks in part to earlier leaks from @jaykihn0.

Intel Pantherlake code comparison screen showing power limits and SKU mapping with highlighted changes. — Image Source: CoreBoot

The PTL-H series introduces several configurations:

4 P-Cores + 8 E-Cores + 4 Xe3 iGPU Cores (4+8+4Xe)
4 P-Cores + 8 E-Cores + 12 Xe3 iGPU Cores (4+8+12Xe)
4 P-Cores + 0 E-Cores + 4 Xe3 iGPU Cores (4+0+4Xe)
2 P-Cores + 0 E-Cores + 4 Xe3 iGPU Cores (2+0+4Xe)

For clarity, each configuration denotes core types: the first number represents the Performance (P) cores, the second indicates Efficient (E) cores, and the final figure refers to the Xe3 GPU cores that represent the latest architecture succeeding the Xe2 used in the Lunar Lake processors.

The most robust model boasts 12 Xe3 cores, delivering enhanced graphical performance over configurations with fewer GPU cores. Interestingly, recent reports suggest that the Panther Lake-H series may see an increase in maximum turbo boost capabilities, with expectations shifting from an earlier anticipated range of 25-45W to a new ceiling of 64W.

Examining power limitations, designations such as PL1, PL2, PL3, and PL4 indicate various frequencies. PL1 specifies the base frequency, while PL2 captures the Max Turbo Boost frequency. PL3 and PL4 are reserved for occasional boosts. The performance mode will operate within a range of 25W to 64W, whereas baseline power levels, depending on configuration, will begin from either 15W or 25W and extend to a maximum of 64W.

This increase in power capacity signals a notable shift in energy consumption and potential performance advancements when compared to Intel’s Lunar Lake, which operates with a power range of only 17W to 30W. It is vital to remember that these specifications remain preliminary and subject to modifications prior to the official launch. Intel has yet to confirm details about the Panther Lake series, but indications suggest they will primarily cater to mobile platforms, notably including gaming handhelds.