AMD Ryzen 9 5900X vs AMD Ryzen 9 7945HX3D
AMD Ryzen 9 5900X
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The AMD Ryzen 9 5900X is a high-end 12-core, hyperthreaded (SMT) Vermeer series desktop processor that can process 24 threads simultaneously. Introduced on October 8, 2020, the Ryzen 9 5900X is the fastest 12-core processor and is specified at 105 watts TDP. The top model, the AMD Ryzen 9 5950X, offers even more power and at the same time offers another 4 cores and 8 threads.
The Ryzen 9 5900X clocks with 3.7 GHz base clock and reaches up to 4.8 GHz on one core in turbo mode. However, when all 12 cores are loaded, up to 4.5 GHz is still possible.
The performance of the AMD Ryzen 9 5900X is consistently excellent in all applications and significantly better than the AMD Ryzen 9 3900X. AMD has been able to significantly improve its single thread performance in particular and even beats the Intel Core i9-10900K in this discipline. The multi-thread performance could also be improved. In an in-house duel, the AMD Ryzen 9 5900X can even take on an AMD Threadripper 2950X.
The internal structure of the processor has not changed fundamentally at first glance. The CCX structure has changed a bit compared to Zen2, because now a CCX consists of up to 8 CPU cores. So each individual core can access the complete L3 cache (32 MByte). Furthermore the CCX modules are connected to each other via the same I/O die, which we already know from Zen2. According to AMD, the Infinity-Fabric should now reach clock rates of up to 2 GHz, which in turn allows a RAM clock of 4.000 MHz without performance loss.
For the manufacturing processes, AMD also relies on TSCM for the Vermeer processors for the 7nm production of the CPU cores, although the I/O die is still supplied in 12nm by Globalfoundries.
In games, the AMD Ryzen 9 5900X is convincing thanks to the significantly improved IPC. With the AMD Ryzen 9 5900X, streaming can be done simultaneously with gaming. But if you only want to play games, you are well advised to take a closer look at the AMD Ryzen 7 5800X or the AMD Ryzen 5 5600X.
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 5900X | AMD Ryzen 9 7945HX3D | ||||||||||||||||||||||||||||
| Codename | Vermeer (Zen3) | Dragon Range-HX (Zen 4) | ||||||||||||||||||||||||||||
| Series | AMD Vermeer (Ryzen 5000) | 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 | 3700 - 4800 MHz | 2300 - 5400 MHz | ||||||||||||||||||||||||||||
| L1 Cache | 768 KB | 1 MB | ||||||||||||||||||||||||||||
| L2 Cache | 6 MB | 16 MB | ||||||||||||||||||||||||||||
| L3 Cache | 64 MB | 128 MB | ||||||||||||||||||||||||||||
| Cores / Threads | 12 / 24 | 16 / 32 16 x 5.4 GHz AMD Zen 4 | ||||||||||||||||||||||||||||
| TDP | 105 Watt | 55 Watt | ||||||||||||||||||||||||||||
| Technology | 7 nm | 5 nm | ||||||||||||||||||||||||||||
| Die Size | 2x 80.7 + 125 (I/O) mm2 | |||||||||||||||||||||||||||||
| Socket | AM4 (1331) | FL1 | ||||||||||||||||||||||||||||
| Features | MMX(+), SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, SSE4A, x86-64, AMD-V, AES, AVX, AVX2, FMA3, SHA, Precision Boost 2 | |||||||||||||||||||||||||||||
| Architecture | x86 | x86 | ||||||||||||||||||||||||||||
| $549 U.S. | ||||||||||||||||||||||||||||||
| Announced | ||||||||||||||||||||||||||||||
| max. Temp. | 89 °C | |||||||||||||||||||||||||||||
| iGPU | AMD Radeon 610M (400 - 2200 MHz) | |||||||||||||||||||||||||||||
| Manufacturer | www.amd.com |
Benchmarks
Average Benchmarks AMD Ryzen 9 5900X → 100% n=30
Average Benchmarks AMD Ryzen 9 7945HX3D → 148% n=30
- Average benchmark values for this graphics card* Smaller numbers mean a higher performance
1 This benchmark is not used for the average calculation
