AMD Ryzen 9 7845HX vs AMD Ryzen 7 8745HX

AMD Ryzen 9 7845HX

The AMD Ryzen 9 7845HX is a fast high-end laptop processor of the Dragon Range series. It offers 12 of the 16 cores based on the Zen 4 architecture that supports hyperthreading (24 threads). The cores clock from 3 (base) up to 5.2 GHz (single core boost). The 7845HX is the second-fastest mobile Ryzen CPU at launch and derived from the desktop Ryzen 9 7900X.

The Dragon Range series still uses a chiplet design with two CCD-clusters (each with 8 possible cores) in 5nm and an IO-die (including the memory controller and the Radeon 610M iGPU) in 6nm. The chip integrates 4x USB 3.2 Gen2 (10 Gbps) ports (no USB4), 28 PCIe 5.0 lanes (for GPU and SSDs) and a dual-channel DDR5-5200 memory controller.

Performance

The average 7845HX in our database is in the same league as the Core i9-13900HX, as far as multi-thread benchmark scores are concerned. This is a super-fast chip, as of mid 2023; of course, your mileage may vary depending on how competent the cooling solution of your laptop is and how high the CPU power limits are.

The R9 7845HX is rated at a TDP of 55 Watt and can be configured from 45 to 75 Watt (cTDP).

AMD Ryzen 7 8745HX

The AMD Ryzen 7 8745HX is a higher-end octa-core Dragon Range refresh lineup processor that debuted in April 2025 and is primarily targeted at gaming laptops. This is essentially a rebadged Ryzen 7 7745HX; as such, the product offers 8 SMT-enabled Zen 4 cores (16 threads) running at 3.6 GHz to 5.1 GHz, along with a rather basic Radeon 610M RDNA 2 architecture iGPU.

This Ryzen 7 8000 APU is composed of two dies made on two different nodes (5 nm for CPU cores; 6 nm for other componentry). It features a very healthy 28 PCIe 5 lanes for connecting graphics cards and SSDs as fast as 15.75 GB/s. The RAM controller is limited to DDR5-5200 or slower; there is no NPU and no Thunderbolt support, the product page on amd.com indicates, but the clock multiplier is unlocked for easy overclocking.

Performance

While we have not tested a single system featuring the 8745HX as of April 2025, multi-threaded Cinebench benchmarks put the 7745HX in the same ballpark as the Core Ultra 9 285H, Core Ultra 9 185H and Core i5-13500HX which is fast enough for any 2025 game.

Power consumption

Much like the 7745HX, the 8745HX has a base TDP (long-term power limit) of 55 watts that can officially be jacked up to as high as 75 watts. That's precisely what Minisforum did with only 7745HX system Notebookcheck has tested so far. Either way, to dissipate 50+ watts, at least one high-RPM fan is needed.