New details about Intel’s upcoming Core Ultra 300 series, codenamed Panther Lake, have emerged via a major leak, offering an early look at the core configurations, clock speeds, and thermal characteristics of the next generation of mobile CPUs. While the chips may not deliver massive boosts in CPU single-threaded performance, the leak strongly suggests they are being engineered to excel in onboard GPU gaming.
The information, sourced from serial leaker @jaykihn0 on X, shows that the Panther Lake range will max out at 16 cores. This top-tier configuration includes only four Performance (P) cores, supplemented by eight Efficient (E) cores. Additionally, every chip in the lineup will feature four dedicated low-power cores designed to optimize efficiency in less demanding scenarios.
The flagship chip, the Core Ultra 300 388H, is set to lead the range with its 4 P-cores, 8 E-cores, and 4 low-power cores. Its maximum boost clock is 5.1GHz, slightly higher than the rest of the range, which is primarily differentiated by varying counts of E-cores.
The true highlight for performance enthusiasts, however, appears to be the integrated graphics. All Panther Lake chips will support Xe3 graphics, though the core count will vary from two on entry-level models to four on the majority of the lineup.
The X variants are touted as the real standouts for gaming. Models like the Core Ultra X9 388H, Ultra X7 368H, and Ultra X7 358H will feature the powerful 12-core Arc B390 Xe3 onboard GPU. Even the Core Ultra 5 338H will get a robust 10-core variant called Arc B370, according to related reports.
In terms of power management, the high-performance H variants of the Panther Lake series will offer OEMs two different TDP (Thermal Design Power) modes: 65W and 80W. This flexibility allows manufacturers to customize laptop designs for different markets, whether optimizing for thin-and-light portability or prioritizing raw, sustained performance in heavier systems. However, the leak also hinted that the new architecture might present some cooling difficulties during demanding single-threaded workloads.
Finally, the new generation is introducing a major source of confusion for consumers: the naming convention. Both Intel and rival AMD are releasing their flagship lines using the “300” moniker. Intel has the Core Ultra 300 range, while AMD has the AI Max 300 range, creating a confusing overlap for anyone attempting to purchase a new laptop. Consumers are advised to exercise caution and conduct thorough research before committing to a purchase.