AMD Ryzen 9 7845HX vs AMD Ryzen 9 7900X3D Comparison

FAQ

Q: Which processor is faster in multi-threaded workloads according to the database?

A: The AMD Ryzen 9 7900X3D wins 22 of the 23 recorded head-to-head benchmarks. Its largest multi-threaded advantage comes in Cinebench R23 multi-core, where it scores 42,767 versus 26,876 for the Ryzen 9 7845HX, a 59.1% lead.

Q: Does the Ryzen 9 7845HX win any benchmark at all?

A: Yes, it wins a single test: Cinebench R15 multi-core, scoring 4,320 against the 7900X3D's 4,310, a delta of only 0.2%. It is a narrow victory and the only recorded case where the mobile chip takes the lead.

Q: How do the two compare in single-threaded performance?

A: The 7900X3D leads in every single-thread test. In Cinebench R23 single-core it scores 6,037 versus 1,852, a 226% advantage. Geekbench single-core shows 2,456 against 2,389, a 2.8% edge. PassMark single-thread records 4,126 versus 3,935, a 4.9% lead.

Q: What is the difference in cache configuration?

A: The 7900X3D has 128 MB of shared L3 cache with a 1x 64MB 3D V-Cache slice. The 7845HX has 64 MB of shared L3 cache and no 3D V-Cache slice. Both have 64 KB of L1 per core and 1 MB of L2 per core.

Q: Which processor has a higher boost clock?

A: The 7900X3D boosts to 5.60 GHz, while the 7845HX boosts to 5.20 GHz. The base clocks differ more substantially: 4.40 GHz for the desktop part versus 3.00 GHz for the mobile part.

Q: Are both processors unlocked for overclocking?

A: Yes, both have an unlocked multiplier. They also both support DDR5 memory with dual-channel configuration and ECC memory, and both are built on TSMC's 5 nm process.

Architecture Differences

The two chips share the same Zen 4 architecture, but they are built for entirely different sockets and market segments. The 7900X3D is a desktop processor on AMD Socket AM5, codenamed Raphael, while the 7845HX is a mobile processor on AMD Socket FL1, codenamed Dragon Range. Both are 12-core, 24-thread parts, but the desktop chip is designed to run at much higher clocks. The 7900X3D has a base clock of 4.40 GHz and a boost clock of 5.60 GHz, whereas the 7845HX starts at 3.00 GHz and boosts to 5.20 GHz. That 1.40 GHz base clock difference is the single biggest architectural driver of performance separation.

The cache hierarchy is another major split. The 7900X3D carries 128 MB of shared L3 cache, including a 64 MB 3D V-Cache slice. The 7845HX has only 64 MB of shared L3 cache and no V-Cache. Both have identical per-core L1 and L2 configurations: 64 KB L1 per core and 1 MB L2 per core. The added L3 capacity on the desktop chip is a direct result of the 3D V-Cache packaging, and it shows up in workloads that are sensitive to memory latency and repeated data access.

Transistor counts also differ. The 7900X3D has 17,840 million transistors, while the 7845HX has 13,140 million. Both use a dual-die design with 2x 71 mm² die size, so the transistor gap comes from the additional cache die on the 7900X3D. The process node is identical: 5 nm at TSMC.

Other architectural differences are smaller but worth noting. The 7900X3D has 24 PCIe Gen 5 lanes (CPU only), while the 7845HX has 28 PCIe Gen 5 lanes. Integrated graphics differ as well: the desktop part uses Radeon Graphics, while the mobile part uses the Radeon 610M. Both support DDR5 memory on a dual-channel bus with 83.2 GB/s of memory bandwidth, and both support ECC memory.

The 7900X3D is rated at 120 W TDP, reflecting its desktop thermal envelope. The 7845HX is rated at 55 W TDP, which is typical for a high-end mobile chip. The release dates are identical, both launching on 2023-01-03. The 7900X3D has a recorded launch MSRP of $599; no launch MSRP is recorded for the 7845HX.

Head-to-Head Benchmarks

The recorded data is overwhelmingly one-sided. The 7900X3D wins 22 of 23 benchmarks, and the margins range from razor-thin to more than double. The largest win for the desktop chip is in Cinebench R23 single-core, where it scores 6,037 against 1,852, a 226% advantage. That is not a small gap; it is the kind of difference that changes how a system feels in everyday use.

Cinebench R15 single-core tells a similar story. The 7900X3D scores 608 versus 295, a 106.1% lead. PassMark physics also shows a huge gap: 4,728 versus 2,346, a 101.5% advantage. These results are consistent with the base clock and boost clock differences.

Multi-threaded results are not as extreme in percentage terms, but they are still decisive. Cinebench R23 multi-core gives the 7900X3D a 59.1% lead (42,767 versus 26,876). PassMark multi-thread shows an 11.8% edge (50,317 versus 45,010). Geekbench multi-core records a 13.1% lead (18,808 versus 16,633). The 3DMark tests, which scale across different thread counts, all favor the 7900X3D, with the 4-thread test showing the largest gap at 6.1% (4,041 versus 3,807) and the 16-thread test showing the smallest at 0.8% (10,144 versus 10,068).

The 7845HX's only win is Cinebench R15 multi-core, where it scores 4,320 against 4,310, a 0.2% edge. That result is essentially a statistical tie. It does not indicate a multi-core advantage; it just means the mobile chip can briefly match the desktop part in one specific legacy workload.

In the PassMark suite, the 7900X3D wins every category. Data compression shows a 9.3% lead (593,838 versus 543,539). Data encryption is 7.6% ahead (35,293 versus 32,789). Extended instructions are 8.6% ahead (44,567 versus 41,020). Floating point math is 3.1% ahead (97,246 versus 94,287). Integer math is 3.6% ahead (160,779 versus 155,118). Random string sorting is 11.8% ahead (70,662 versus 63,223). Prime number finding is 35.3% ahead (445 versus 329). The pattern is consistent: the desktop chip wins everywhere, with the largest margins in tests that depend on clock speed or cache behavior.

The average benchmark scores in the database confirm the overall picture. The 7900X3D has an average benchmark score of 47,908, and it sits at the 90th percentile among all CPUs. The 7845HX has an average score of 46,654 and sits at the 89th percentile. Both are strong parts, but the desktop chip is measurably ahead across the full test suite.

Specification Differences

| Specification | AMD Ryzen 9 7900X3D | AMD Ryzen 9 7845HX |

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

| Base clock | 4.40 GHz | 3.00 GHz |

| Boost clock | 5.60 GHz | 5.20 GHz |

| TDP | 120 W | 55 W |

| Socket | AMD Socket AM5 | AMD Socket FL1 |

| Codename | Raphael | Dragon Range |

| Transistors | 17,840 million | 13,140 million |

| L3 cache | 128 MB (shared) | 64 MB (shared) |

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

| PCIe lanes | Gen 5, 24 Lanes (CPU only) | Gen 5, 28 Lanes (CPU only) |

| Integrated graphics | Radeon Graphics | Radeon 610M |

| Market segment | Desktop | Mobile |

| Launch MSRP | $599 | Not recorded |

| Part number | 100-000000909 | 100-000000871 |

Both processors share the same core and thread counts, the same 5 nm TSMC process, the same dual-die 2x 71 mm² layout, the same DDR5 dual-channel memory support, the same 83.2 GB/s memory bandwidth, the same ECC support, and the same unlocked multiplier. The differences above are the complete set of specification deltas recorded in the database.

The Verdict

The data points to a clear conclusion: the 7900X3D is the stronger processor in nearly every recorded workload. It wins 22 of 23 benchmarks, often by large margins. Its Cinebench R23 single-core lead of 226% and its Cinebench R15 single-core lead of 106.1% are not incremental improvements; they are generational-scale differences. Multi-threaded performance is also firmly in its favor, with a 59.1% lead in Cinebench R23 multi-core and a 13.1% lead in Geekbench multi-core.

The 7845HX is not a weak chip. It sits at the 89th percentile among all CPUs, and its average benchmark score of 46,654 is close to the 7900X3D's 47,908. Its nearest rivals in the database include the Intel Core i7-13700K and the AMD Ryzen 9 5900, both strong parts. But in a direct comparison against the 7900X3D, it loses every meaningful test except one legacy multi-core workload by 0.2%.

The 55 W TDP of the 7845HX is a critical context. This is a mobile processor designed for laptops, where power and thermal limits are tight. The 120 W TDP of the 7900X3D reflects its desktop design. The performance gap is partly the price of that power difference. For anyone choosing between these two parts, the decision should be based on the platform, not on raw performance. If the system is a desktop, the 7900X3D is the obvious choice. If the system is a laptop, the 7845HX is the only option in this pairing.

Where Each One Wins

The 7900X3D wins in every category that the recorded data covers, but the margin varies by workload type. In single-threaded and lightly threaded tasks, the desktop chip is dominant. The 226% lead in Cinebench R23 single-core and the 106.1% lead in Cinebench R15 single-core make it the clear pick for applications that rely on one or two cores, such as everyday desktop responsiveness, legacy software, and lightly threaded productivity tools. The 4.9% PassMark single-thread lead and the 4.2% 3DMark 2-thread lead reinforce this pattern.

In multi-threaded workloads, the 7900X3D is still ahead, but the margin shrinks. The 59.1% lead in Cinebench R23 multi-core is substantial, yet the 0.8% lead in 3DMark 16-threads shows that heavily threaded workloads can narrow the gap. Still, the desktop chip wins these tests, so it is the better choice for rendering, video encoding, and compilation workloads that scale across all 24 threads.

The 7845HX's only recorded win is Cinebench R15 multi-core, where it edges out the 7900X3D by 0.2%. That result should not be overinterpreted. It is a single legacy benchmark with a margin that is effectively noise. The mobile chip also shows competitive results in some PassMark math tests: floating point math is only 3.1% behind, and integer math is only 3.6% behind. These are the areas where the 7845HX is closest to the desktop part.

The real strength of the 7845HX is not in the benchmark data; it is in the platform. With a 55 W TDP and a mobile socket, it is designed for high-end laptops where the 7900X3D cannot physically fit. The 7900X3D, with its 120 W TDP and AM5 socket, is a desktop part through and through. Users who need a laptop CPU with 12 cores and 24 threads should choose the 7845HX. Users who want maximum performance in a desktop system should choose the 7900X3D, which wins 22 of 23 benchmarks and holds a 90th percentile ranking among all CPUs.