AMD Ryzen 7 8745HX vs AMD Ryzen 9 7940HX vs AMD Ryzen 9 7840HX
AMD Ryzen 7 8745HX
► remove from comparison
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.
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).
AMD Ryzen 9 7840HX
► remove from comparisonThe AMD Ryzen 9 7840HX is a high-end notebook processor from the Dragon Range series with 12 cores and hyperthreading (SMT), which means it can process up to 24 threads simultaneously. The CPU uses the current Zen 4 architecture for the 12 cores and clocks these from 2.9 GHz (base clock) up to 5.1 GHz (single-core boost). The CPU offers 12 MB L2 cache and 64 MB L3 cache (i.e. a total of 76 MB cache). The 7840X consists of three chiplets, two CCD clusters with a maximum of 8 CPU cores on 5nm (71mm²) and one IO die on 6nm (122mm²) which are all manufactured by TSMC.
The performance of the Ryzen 9 should be significantly faster than the old Ryzen 9 6980HX (top model Rembrandt H, 8 cores, max 5 GHz). This is achieved by the additional cores, higher clock rate and improved architecture. Compared to the one year older Ryzen 9 7845HX, the 7840HX is clocked 100 MHz lower.
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 7840HX is specified with 55 watts TDP and can be configured from 45 to 75 watts (cTDP).
| Model | AMD Ryzen 7 8745HX | AMD Ryzen 9 7940HX | AMD Ryzen 9 7840HX | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Codename | Dragon Range refresh (Zen 4) | Dragon Range-HX (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 | 3600 - 5100 MHz | 2400 - 5200 MHz | 2900 - 5100 MHz | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| L1 Cache | 512 KB | 1 MB | 768 KB | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| L2 Cache | 8 MB | 16 MB | 12 MB | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| L3 Cache | 32 MB | 64 MB | 64 MB | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Cores / Threads | 8 / 16 8 x 5.1 GHz AMD Zen 4 | 16 / 32 16 x 5.2 GHz AMD Zen 4 | 12 / 24 12 x 5.1 GHz AMD Zen 4 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| TDP | 55 Watt | 55 Watt | 55 Watt | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Technology | CCD = 5nm, I/O = 6 nm | 5 nm | 5 nm | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| max. Temp. | 100 °C | 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 ( - 2200 MHz) | AMD Radeon 610M (400 - 2200 MHz) | AMD Radeon 610M (400 - 2200 MHz) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Architecture | x86 | x86 | x86 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Announced | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Manufacturer | www.amd.com | www.amd.com | www.amd.com | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Transistors | 9900 Million | 9900 Million |
Benchmarks
Average Benchmarks AMD Ryzen 9 7940HX → 0% n=0
Average Benchmarks AMD Ryzen 9 7840HX → 0% n=0
- Average benchmark values for this graphics card* Smaller numbers mean a higher performance
1 This benchmark is not used for the average calculation
