AMD Ryzen 9 7940HX vs AMD Ryzen 9 7845HX
AMD Ryzen 9 7940HX
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The 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 7845HX
► remove from comparisonThe 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).
| Model | AMD Ryzen 9 7940HX | AMD Ryzen 9 7845HX | ||||||||||||||||||||||||||||||||||||||||
| Codename | 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) | ||||||||||||||||||||||||||||||||||||||||
| Series: Dragon Range (Zen 4, Ryzen 7X4X/8X4X) Dragon Range-HX (Zen 4) |
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| Clock | 2400 - 5200 MHz | 3000 - 5200 MHz | ||||||||||||||||||||||||||||||||||||||||
| L1 Cache | 1 MB | 768 KB | ||||||||||||||||||||||||||||||||||||||||
| L2 Cache | 16 MB | 12 MB | ||||||||||||||||||||||||||||||||||||||||
| L3 Cache | 64 MB | 64 MB | ||||||||||||||||||||||||||||||||||||||||
| Cores / Threads | 16 / 32 16 x 5.2 GHz AMD Zen 4 | 12 / 24 12 x 5.2 GHz AMD Zen 4 | ||||||||||||||||||||||||||||||||||||||||
| TDP | 55 Watt | 55 Watt | ||||||||||||||||||||||||||||||||||||||||
| Transistors | 9900 Million | 9900 Million | ||||||||||||||||||||||||||||||||||||||||
| Technology | 5 nm | CCD = 5 nm, I/O = 6 nm | ||||||||||||||||||||||||||||||||||||||||
| max. Temp. | 100 °C | 100 °C | ||||||||||||||||||||||||||||||||||||||||
| Socket | 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 | ||||||||||||||||||||||||||||||||||||||||
| iGPU | AMD Radeon 610M (400 - 2200 MHz) | AMD Radeon 610M (400 - 2200 MHz) | ||||||||||||||||||||||||||||||||||||||||
| Architecture | x86 | x86 | ||||||||||||||||||||||||||||||||||||||||
| Announced | ||||||||||||||||||||||||||||||||||||||||||
| Manufacturer | www.amd.com | www.amd.com |
Benchmarks
Average Benchmarks AMD Ryzen 9 7940HX → 100% n=7
Average Benchmarks AMD Ryzen 9 7845HX → 95% 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
