AMD Ryzen 9 7940HX vs AMD Ryzen 9 7900 vs AMD Ryzen 9 7945HX3D
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 7900
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The AMD Ryzen 9 79 00 is a high-end desktop processorfrom the Raphael series with 12 cores and hyperthreading (SMT), which means it can process up to 24 threads simultaneously. Launched in early 2023, the Ryzen 9 7900 is the fastest 12-core processor with 65 watts TDP.
The Ryzen 9 7900 clocks at 3.7 GHz base clock and reaches up to 5.4 GHz on one core in Turbo mode. This is also the difference to the higher clocked Ryzen 9 7900X.
At first glance, the internal structure of the processor has not changed fundamentally. The AMD Ryzen 9 7900 is still based on the chiplet design consisting of two CCD clusters, each containing a CCX with 8 cores. However, the manufacturing process has been scaled down to 5 nm, which ensures higher clock rates. There is also the IO die, which contains the memory controller and the iGPU, among other things. This is now manufactured in a 6 nm structure width.
The AMD Ryzen 9 7900 can impress in games thanks to the significantly improved IPC.
AMD Ryzen 9 7945HX3D
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The AMD Ryzen 9 7945HX3D is a fast high-end laptop processor of the Dragon Range series. It offers 16 cores based on the Zen 4 architecture that supports hyperthreading (32 threads). The cores clock from 2.3 (base) up to 5.4 GHz (single core boost). Compared to the similar R9 7945HX, the 7945HX3D offers an additional 64 MB 3D V-Cache on one CCD-Cluster. This helps in some workloads that can use the additional fast cache (e.g. some games). The guaranteed base clock however was reduced from 2.5 to 2.3 GHz.
The performance of the R9 7945HX3D is similar to the R9 7945HX in workloads that wont make use of the bigger L3 cache. Most games however can use the additional memory. AMD e.g. was advertising the HX3D with 4% to 53% higher performance in 1080p high settings.
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.
The R9 7945HX3D is rated at a TDP of 55 Watt and can be configured up to 75 Watt (cTDP).
| Model | AMD Ryzen 9 7940HX | AMD Ryzen 9 7900 | AMD Ryzen 9 7945HX3D | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Codename | Dragon Range-HX (Zen 4) | Raphael (Zen4) | Dragon Range-HX (Zen 4) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Series | AMD Dragon Range (Zen 4, Ryzen 7X4X/8X4X) | AMD Raphael (Zen 4, Ryzen 7000) | 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 | 3700 - 5400 MHz | 2300 - 5400 MHz | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| L1 Cache | 1 MB | 768 KB | 1 MB | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| L2 Cache | 16 MB | 12 MB | 16 MB | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| L3 Cache | 64 MB | 64 MB | 128 MB | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Cores / Threads | 16 / 32 16 x 5.2 GHz AMD Zen 4 | 12 / 24 | 16 / 32 16 x 5.4 GHz AMD Zen 4 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| TDP | 55 Watt | 65 Watt | 55 Watt | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Transistors | 9900 Million | 9.9 Million | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Technology | 5 nm | 5 nm | 5 nm | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| max. Temp. | 100 °C | 95 °C | 89 °C | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Socket | FL1 | AM5 (LGA 1718) | 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 | MMX(+), SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, SSE4A, x86-64, AMD-V, AES, AVX, AVX2, AVX512F, FMA3, SHA, Precision Boost 2 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| iGPU | AMD Radeon 610M (400 - 2200 MHz) | AMD Radeon Graphics (Ryzen 7000) ( - 2200 MHz) | AMD Radeon 610M (400 - 2200 MHz) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Architecture | x86 | x86 | x86 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Announced | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Manufacturer | www.amd.com | www.amd.com | www.amd.com | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Voltage | 0.650 - 1.475V V | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Die Size | 262 mm2 |
Benchmarks
Average Benchmarks AMD Ryzen 9 7940HX → 100% n=7
Average Benchmarks AMD Ryzen 9 7900 → 102% n=7
Average Benchmarks AMD Ryzen 9 7945HX3D → 110% 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
