AMD Ryzen 9 7845HX vs AMD Ryzen 9 8940HX vs AMD Ryzen 9 7940HX
AMD Ryzen 9 7845HX
► remove from comparison
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 9 8940HX
► remove from comparisonThe AMD Ryzen 9 8940HX is a flagship 16-core Dragon Range refresh lineup laptop processor that debuted in April 2025. The product offers 16 SMT-enabled Zen 4 cores (32 threads) running at 2.4 GHz to 5.3 GHz, along with a rather basic Radeon 610M RDNA 2 architecture iGPU. This Ryzen 9 8000 APU is essentially a Ryzen 9 7940HX with the Turbo clock speed increased by 100 MHz.
The 8940HX is composed of three 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 8940HX as of April 2025, we do have some Cinebench benchmark scores for the 7940HX. Based on those, the newer Ryzen 9 should have no trouble beating the Core i9-13950HX, Core i9-13980HX and Core i9-14900HX.
That being said, with this many cores the APU will probably do a much better job serving content creators rather than gamers.
Power consumption
Much like the 7940HX, the 8940HX has a base TDP (long-term power limit) of 55 watts that can officially be jacked up to as high as 75 watts. To dissipate 50+ watts, at least one high-RPM fan is needed.
AMD Ryzen 9 7940HX
► remove from comparisonThe AMD Ryzen 9 7940HX is a high-end notebook processor from the Dragon Range series with 16 cores and hyperthreading (SMT), which means it can process up to 32 threads simultaneously. The CPU uses the current Zen 4 architecture for the 16 cores and clocks these from 2.4 GHz (base clock) up to 5.2 GHz (single-core boost). The CPU offers 16 MB L2 cache and 64 MB L3 cache (i.e. a total of 80 MB cache). The 7940HX consists of three chiplets, two CCD clusters with 8 CPU cores each made with a 5nm node (71mm²) and one IO die on 6nm (122mm²), are all manufactured at TSMC's fabs.
The performance of the Ryzen 9 should be comparable to a Core i9-13900HX (24 hybrid cores, max 5.4 GHz) in the top range of mobile processors from 2024. AMD itself advertises a clear lead over the old Ryzen 9 6900HX (8 Zen 3 cores, 4.9 GHz), which can be explained by the additional cores, improved architecture and higher frequencies. Compared to the top model, the Ryzen 9 7945HX, the 7940HX is slightly lower clocked.
The chip also integrates 4x USB 3.2 Gen2 (10 Gbps) ports (no USB 4), 28 PCIe 5.0 lanes (for GPUs and SSDs), a dual-channel DDR5-5200 memory controller and a small AMD Radeon 610M graphics card (2CUs, 400 - 2200 MHz).
The R9 7940HX is specified with 55 watts TDP and can be configured up to 75 watts (cTDP).
| Model | AMD Ryzen 9 7845HX | AMD Ryzen 9 8940HX | AMD Ryzen 9 7940HX | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Codename | Dragon Range-HX (Zen 4) | Dragon Range refresh (Zen 4) | Dragon Range-HX (Zen 4) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Series | AMD Dragon Range (Zen 4, Ryzen 7X4X/8X4X) | AMD Dragon Range (Zen 4, Ryzen 7X4X/8X4X) | AMD Dragon Range (Zen 4, Ryzen 7X4X/8X4X) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Series: Dragon Range (Zen 4, Ryzen 7X4X/8X4X) Dragon Range-HX (Zen 4) |
|
|
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Clock | 3000 - 5200 MHz | 2400 - 5300 MHz | 2400 - 5200 MHz | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| L1 Cache | 768 KB | 1 MB | 1 MB | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| L2 Cache | 12 MB | 16 MB | 16 MB | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| L3 Cache | 64 MB | 64 MB | 64 MB | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Cores / Threads | 12 / 24 12 x 5.2 GHz AMD Zen 4 | 16 / 32 16 x 5.3 GHz AMD Zen 4 | 16 / 32 16 x 5.2 GHz AMD Zen 4 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| TDP | 55 Watt | 55 Watt | 55 Watt | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Transistors | 9900 Million | 9900 Million | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Technology | CCD = 5 nm, I/O = 6 nm | CCD = 5nm, I/O = 6 nm | 5 nm | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| max. Temp. | 100 °C | 100 °C | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Socket | FL1 | FL1 | FL1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Features | DDR5-5200 RAM, PCIe 5, MMX, SSE, SSE2, SSE3, SSSE3, SSE4A, SSE4.1, SSE4.2, AVX, AVX2, AVX-512, BMI2, ABM, FMA, ADX, SMEP, SMAP, SMT, CPB, AES-NI, RDRAND, RDSEED, SHA, SME | DDR5-5200 RAM, PCIe 5, MMX, SSE, SSE2, SSE3, SSSE3, SSE4A, SSE4.1, SSE4.2, AVX, AVX2, AVX-512, BMI2, ABM, FMA, ADX, SMEP, SMAP, SMT, CPB, AES-NI, RDRAND, RDSEED, SHA, SME | DDR5-5200 RAM, PCIe 5, MMX, SSE, SSE2, SSE3, SSSE3, SSE4A, SSE4.1, SSE4.2, AVX, AVX2, AVX-512, BMI2, ABM, FMA, ADX, SMEP, SMAP, SMT, CPB, AES-NI, RDRAND, RDSEED, SHA, SME | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| iGPU | AMD Radeon 610M (400 - 2200 MHz) | AMD Radeon 610M ( - 2200 MHz) | AMD Radeon 610M (400 - 2200 MHz) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Architecture | x86 | x86 | x86 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Announced | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Manufacturer | www.amd.com | amd.com | www.amd.com |
Benchmarks
Average Benchmarks AMD Ryzen 9 7845HX → 100% n=7
Average Benchmarks AMD Ryzen 9 8940HX → 112% n=7
Average Benchmarks AMD Ryzen 9 7940HX → 106% n=7
- Average benchmark values for this graphics card* Smaller numbers mean a higher performance
1 This benchmark is not used for the average calculation
