AMD Ryzen 9 7945HX3D vs AMD Ryzen Threadripper PRO 3955WX Comparison

The AMD Ryzen 9 7945HX3D and AMD Ryzen Threadripper PRO 3955WX are both 16-core, 32-thread processors, yet they occupy opposite ends of the AMD lineup: a mobile part with 3D V-Cache versus a desktop workstation chip with eight-channel memory. Their average benchmark scores are almost identical—56,635 for the 7945HX3D and 56,555 for the Threadripper, a 0.1% gap—but head-to-head testing tells a different story. The 7945HX3D wins all 19 benchmarks, with margins ranging from 11.3% to 125.3%.

FAQ

Q: Which processor has more L3 cache?

A: The Ryzen 9 7945HX3D has 128 MB of shared L3 cache, while the Threadripper PRO 3955WX has 64 MB. The 7945HX3D also includes a dedicated 64 MB 3D V-Cache slice.

Q: What are the memory bandwidth differences?

A: The Threadripper PRO 3955WX supports eight-channel DDR4 memory with 204.8 GB/s bandwidth, whereas the 7945HX3D uses dual-channel DDR5 at 83.2 GB/s. The Threadripper also offers 128 PCIe Gen 4 lanes, compared to 28 Gen 5 lanes on the 7945HX3D.

Q: Which CPU has a higher boost clock?

A: The 7945HX3D boosts to 5.40 GHz, while the Threadripper PRO 3955WX reaches 4.30 GHz. The Threadripper has a higher base clock at 3.90 GHz versus 2.30 GHz for the 7945HX3D.

Q: How do their average benchmark scores compare?

A: The 7945HX3D averages 56,635, and the Threadripper averages 56,555, a 0.1% difference. Both sit in the 94th percentile among all CPUs.

Q: Which processor is newer?

A: The 7945HX3D was released on 2023-07-26, while the Threadripper PRO 3955WX came out on 2020-07-13.

Q: Do both support ECC memory?

A: Yes, both processors support ECC memory.

The Verdict

The data is unambiguous: the Ryzen 9 7945HX3D outperforms the Threadripper PRO 3955WX in every single head-to-head benchmark. It leads by 43.1% in all Cinebench tests, 33.8% in Geekbench multi-core, and 64.4% in Geekbench single-core. The 7945HX3D also dominates math-heavy workloads, with a 125.3% advantage in prime-number finding and a 75.7% lead in physics simulation. The Threadripper, despite its higher base clock and massive memory bandwidth, fails to win a single test in the provided suite.

However, the Threadripper's strengths lie outside these compute benchmarks. Its eight-channel memory and 128 PCIe Gen 4 lanes make it a platform for memory-hungry or I/O-intensive applications, though none of that is reflected in the test results. For users prioritizing raw CPU performance, the 7945HX3D is the clear choice. The Threadripper PRO 3955WX had a launch MSRP of $1149, but that is not a performance metric. Within the scope of the data, the 7945HX3D is the superior processor.

Head-to-Head Benchmarks

The 7945HX3D's sweep is comprehensive. The largest margin is in PassMark's find prime numbers test, where it scores 446 versus 198, a 125.3% delta. Physics simulation follows with a 75.7% lead (4,321 vs. 2,460). Geekbench single-core shows a 64.4% gap (2,769 vs. 1,684), while floating-point math is 56% higher (121,619 vs. 77,979). Integer math sees a 51.9% advantage (201,217 vs. 132,456), and PassMark single-thread is 51.2% ahead (4,050 vs. 2,679).

Cinebench results are uniformly 43.1% in favor of the 7945HX3D across R15, R20, and R23, both multi-core and single-core. For example, Cinebench R23 multi-core scores 48,834 versus 34,131, and single-core 6,894 versus 4,818. Geekbench multi-core is 33.8% higher (16,758 vs. 12,523). Other PassMark tests show leads of 34.3% in extended instructions, 31.6% in random string sorting, 16.3% in data compression, and 11.3% in data encryption. The multithread score is 43.1% higher (57,476 vs. 40,155). The 7945HX3D wins all 19 tests; the Threadripper records zero wins.

Specification Differences

| Specification | Ryzen 9 7945HX3D | Threadripper PRO 3955WX |

|----------------|------------------|-------------------------|

| Base clock | 2.30 GHz | 3.90 GHz |

| Boost clock | 5.40 GHz | 4.30 GHz |

| TDP | 55 W | 280 W |

| Socket | AMD Socket FL1 | AMD Socket WRX8 |

| Architecture | Zen 4 | Zen 2 |

| Process node | 5 nm | 7 nm |

| Transistors | 17,840 million | 7,600 million |

| Die size | 2x 71 mm² | 2x 74 mm² |

| L2 cache per core | 1 MB | 512 KB |

| L3 cache | 128 MB shared | 64 MB |

| 3D V-Cache | 1x 64 MB slice | None |

| Memory support | DDR5 | DDR4 |

| Memory bus | Dual-channel | Eight-channel |

| Memory bandwidth | 83.2 GB/s | 204.8 GB/s |

| PCIe | Gen 5, 28 lanes | Gen 4, 128 lanes |

| Integrated graphics | Radeon 610M | None |

| Market segment | Mobile | Desktop |

| Release date | 2023-07-26 | 2020-07-13 |

| Launch MSRP | — | $1149 |

| Multiplier unlocked | Yes | No |

Architecture Differences

The 7945HX3D is built on Zen 4 at 5 nm, while the Threadripper PRO 3955WX uses Zen 2 at 7 nm. This process advantage helps the mobile chip pack 17,840 million transistors into a 2x 71 mm² die, compared to 7,600 million on the Threadripper's 2x 74 mm². The 7945HX3D also adds a 64 MB 3D V-Cache slice on top of its 128 MB L3, while the Threadripper has no V-Cache and only 64 MB L3. Per-core L2 is 1 MB on the 7945HX3D versus 512 KB on the Threadripper.

Memory architecture differs sharply: the 7945HX3D uses dual-channel DDR5, the Threadripper eight-channel DDR4. The Threadripper's 204.8 GB/s bandwidth is more than double the 83.2 GB/s of the 7945HX3D, and its 128 PCIe Gen 4 lanes dwarf the 28 Gen 5 lanes of the mobile part. The 7945HX3D includes a Radeon 610M integrated GPU; the Threadripper has none. The mobile chip is unlocked, the desktop part is not. These architectural choices reflect their intended roles: a power-efficient laptop CPU versus a workstation powerhouse.

Where Each One Wins

In the provided benchmark suite, the 7945HX3D wins every test. Its dominance spans single-thread and multi-thread workloads, from Cinebench and Geekbench to PassMark's encryption, compression, and math routines. The largest margins are in prime-number finding (125.3%) and physics (75.7%), indicating exceptional integer and floating-point throughput. The 7945HX3D's 3D V-Cache and higher boost clock likely contribute to these results, though the data does not isolate the cause.

The Threadripper PRO 3955WX, despite losing all compute benchmarks, holds clear advantages in memory bandwidth (204.8 GB/s vs. 83.2 GB/s) and PCIe lane count (128 vs. 28). For workloads that stress memory access patterns or require many expansion cards, the Threadripper's platform could be more suitable, but none of those scenarios appear in the tested benchmarks. The data shows that for CPU-bound tasks, the 7945HX3D is the superior performer; the Threadripper's strengths remain outside the scope of these tests.