AMD Ryzen 7 7745HX vs AMD Ryzen 7 7840U: comparison
Comparison of AMD Ryzen 7 7745HX and AMD Ryzen 7 7840U: key differences and a full specification table.
Key differences
AMD Ryzen 7 7745HX has a higher base clock (3.6 GHz vs 3.3 GHz), a larger L3 cache (32 MB vs 16 MB) and a newer PCIe version (5 vs 4).
At the same time, AMD Ryzen 7 7840U has a lower TDP (28 W vs 55 W), a finer process node (4 nm vs 5 nm), a higher maximum memory size (256 GB vs 64 GB) and a higher maximum integrated graphics clock (2.7 GHz vs 2.2 GHz).
Both processors match on: core count (8), thread count (16), maximum clock (5.1 GHz), memory channels (2).
These are specification values: they show differences between the models but do not determine a performance winner. For a specific workload, rely on independent benchmarks.
Key specifications
| Parameter | AMD Ryzen 7 7745HX | AMD Ryzen 7 7840U |
|---|---|---|
| Cores / threads | 8 / 16 | 8 / 16 |
| Max boost clock | 5.1 GHz | 5.1 GHz |
| L3 cache | 32 MB | 16 MB |
| TDP | 55 W | 28 W |
| Process | 5 nm | 4 nm |
| Integrated graphics | AMD Radeon 610M | AMD Radeon 780M |
Full specification table
Differing values are highlighted. This is not a better/worse rating: numbers from different architectures are not always comparable.
| Parameter | AMD Ryzen 7 7745HX | AMD Ryzen 7 7840U |
|---|---|---|
| General | ||
| Codename | Dragon Range | Phoenix |
| Segment | Mobile | Mobile |
| Product line | AMD Ryzen 7 Processors with Radeon Graphics | AMD Ryzen 7 Processors with Radeon Graphics |
| Product family | AMD Ryzen Processors | AMD Ryzen Processors |
| Architecture | "Zen 4" | "Zen 4" |
| Process | 5 nm | 4 nm |
| Dies per package | 2 | 1 |
| Unlocked for overclocking | Yes | No |
| Operating system support | Windows 11 - 64-Bit Edition, Windows 10 - 64-Bit Edition, RHEL x86 64-Bit, Ubuntu x86 64-Bit | Windows 11 - 64-Bit Edition, Windows 10 - 64-Bit Edition, RHEL x86 64-Bit, Ubuntu x86 64-Bit |
| Regional availability | Global, China, NA, EMEA, APJ, LATAM | Global, China, NA, EMEA, APJ, LATAM |
| Consumer oriented | Yes | Yes |
| Commercial oriented | — | Yes |
| CPU | ||
| Cores | 8 | 8 |
| Threads | 16 | 16 |
| Multithreading (SMT/HT) | Yes | Yes |
| Base clock | 3.6 GHz | 3.3 GHz |
| Max boost clock | 5.1 GHz | 5.1 GHz |
| L1 cache | 512 KB | — |
| L2 cache | 8 MB | 8 MB |
| L3 cache | 32 MB | 16 MB |
| TDP | 55 W | 28 W |
| Configurable TDP | 45–75 W | 15–30 W |
| Instruction set | x86-64 | x86-64 |
| Instruction set extensions | AES, AMD-V, AVX, AVX2, AVX512, FMA3, MMX(+), SHA, SSE, SSE2, SSE3, SSE4.1, SSE4.2, SSE4A, SSSE3, x86-64 | AES, AMD-V, AVX, AVX2, AVX512, FMA3, MMX(+), SHA, SSE, SSE2, SSE3, SSE4.1, SSE4.2, SSE4A, SSSE3, x86-64 |
| Boost technology | Precision Boost 2 | — |
| Memory | ||
| Max memory size | 64 GB | 256 GB |
| Memory types | DDR5 | DDR5, LPDDR5 |
| Memory channels | 2 | 2 |
| ECC memory supported | No | Yes |
| Memory speed (text) | 2x1R | DDR5-5200 | | | 2x2R | DDR5-5200 | 4x2R | DDR5-5600 | | | 4x2R | LPDDR5x-7500 |
| Memory form factor | SO-DIMM | UDIMM |
| Graphics | ||
| Integrated graphics | AMD Radeon 610M | AMD Radeon 780M |
| Has integrated graphics | Yes | Yes |
| Graphics max frequency | 2.2 GHz | 2.7 GHz |
| Graphics units | 2 | 12 |
| Max displays | 4 | 4 |
| DirectX | 12 | 12 |
| DisplayPort over USB-C | Yes | Yes |
| HDCP version | 2.3 | 2.3 |
| Adaptive sync | — | Yes |
| DisplayPort version | 2.1 | 2.1 |
| HDMI version | — | 2.1 |
| Multi-display support | Yes | Yes |
| Wireless display | Miracast | Miracast |
| I/O and interfaces | ||
| PCI Express revision | 5 | 4 |
| PCI Express lanes | 28 | 20 |
| USB 2.0 ports | 1 | 4 |
| USB 3.2 Gen 2 ports | 4 | 2 |
| NVMe support | Boot, RAID0, RAID1, RAID10 | Boot, RAID0, RAID1, RAID10 |
| USB Type-C support | Yes | — |
| Package and thermal | ||
| Sockets supported | FL1 | FP7, FP7r2, FP8 |
| TJUNCTION | 100 °C | 100 °C |
| Die size | 71 mm² | 178 mm² |
| I/O die process | 6 nm | — |
| I/O die size | 122 mm² | — |
| Security and virtualization | ||
| Execute Disable Bit | Yes | Yes |
| AMD PRO technologies | No | No |
| Technologies | ||
| Precision Boost Overdrive | Yes | No |
| AMD EXPO memory profiles | Yes | No |
| Curve Optimizer | — | No |
| Identifiers | ||
| Product ID (OEM) | 100-000000721 | 100-000000830 (FP7r2), 100-000000829 (FP7), 100-000001131 (FP8) |