Intel’s Core Ultra 9 290HX Plus has started appearing in select high-end gaming laptops, including configurations like the Alienware 16 Area-51 and Acer Predator PHN18. Built on the same Arrow Lake platform as the Core Ultra 9 275HX, the 290HX Plus is best understood as a faster, higher-power version of the existing chip. That extra speed comes with a trade-off that power users will recognize immediately: noticeably higher CPU temperatures under heavy workloads.
In side-by-side testing using two different Alienware 16 configurations, both systems were pushed with the same Prime95 stress test while running in Overdrive mode (the setting that ramps fans to their maximum). The Core Ultra 9 275HX system stabilized around 3.8 GHz at roughly 92°C. The Core Ultra 9 290HX Plus, aiming higher, settled at about 4.1 GHz but reached approximately 103°C.
That 103°C number matters because many mobile processors are designed with a typical maximum junction temperature around 105°C. In other words, under an all-core stress load, the Core Ultra 9 290HX Plus can run extremely close to the thermal ceiling—about as hot as a laptop CPU realistically gets before it starts relying heavily on thermal limits to stay in check.
What makes this more interesting is how it compares to other popular gaming laptops under similar conditions. In the same type of Prime95 load, machines such as the MSI Vector 16 HX and Lenovo Legion 7 16IAX10 were reported to stabilize around 82°C. That puts them nearly 20°C cooler than the hotter-running Alienware configuration with the Core Ultra 9 290HX Plus, despite the Alienware’s aggressive performance profile.
The good news for most gamers is that these peak temperatures are tied to extreme, sustained CPU-only workloads—think 100% utilization scenarios like heavy rendering, stress testing, or long multi-threaded tasks. In more typical real-world use, especially gaming, temperatures on the Core Ultra 9 290HX Plus system tend to stay in the low 80°C range rather than living above 100°C. It’s still warmer than the Core Ultra 9 275HX version in the same laptop family, but the triple-digit spikes should be uncommon unless you’re regularly maxing the CPU.
For anyone shopping for an enthusiast-level gaming laptop, the takeaway is straightforward: the Core Ultra 9 290HX Plus can deliver higher clocks and stronger performance, but it may also demand more from the cooling system—particularly in chassis and thermal designs that already run hot. If your workload includes frequent sustained CPU-heavy tasks, thermals should be part of your buying decision right alongside GPU choice, display, and battery expectations.
