AMD Ryzen 7 8745HX vs AMD Ryzen 9 7945HX3D Comparison

The AMD Ryzen 7 8745HX and AMD Ryzen 9 7945HX3D are both high-end mobile processors built on the same Zen 4 architecture, yet they target distinctly different user profiles. The benchmark data is unambiguous: the Ryzen 9 7945HX3D wins all 11 head-to-head comparisons, often by massive margins, while the Ryzen 7 8745HX offers a lower-cost entry point into the same platform. The 7945HX3D is the clear choice for users who need maximum multi-threaded throughput and are willing to accept its lower base clock and older release date. The 8745HX, despite its 8-core configuration, delivers surprisingly competitive single-thread performance and remains a strong option for those who prioritize a newer release timeline and do not require the extreme core count.

The Verdict

The data dictates a simple verdict: choose the AMD Ryzen 9 7945HX3D for uncompromising performance, and the AMD Ryzen 7 8745HX for a more balanced, newer platform entry. The 7945HX3D posts a 45.2% higher PassMark multithread score (57476 vs 31517) and a 61.1% higher physics score (4321 vs 1681), making it the definitive performance king. Its 16 cores and 32 threads double the 8745HX's 8 cores and 16 threads, which is the primary driver of these victories. However, the 8745HX is not a weak processor; its PassMark single-thread score of 3879 is only 4.2% behind the 7945HX3D's 4050, showing that for lightly-threaded tasks, the gap narrows considerably. The 8745HX also has a newer release date (2025-04-22 vs 2023-07-26) and a higher base clock (3.60 GHz vs 2.30 GHz), which may appeal to users who value platform freshness over raw core count. The 7945HX3D is the pick for content creators, data scientists, and anyone running heavily parallel workloads. The 8745HX is the pick for gamers or professionals who need solid performance with a preference for newer hardware.

Architecture Differences

Both processors share the same fundamental architecture: Zen 4, codenamed Dragon Range, built on a 5 nm process from TSMC. They also share the same socket (AMD Socket FL1), memory support (DDR5, dual-channel, 83.2 GB/s bandwidth), and PCIe configuration (Gen 5, 28 lanes). The core differences lie in the chip design and cache hierarchy. The 7945HX3D packs 16 cores and 32 threads, while the 8745HX has 8 cores and 16 threads. This core count disparity is reflected in the transistor count: the 7945HX3D has 17,840 million transistors across a dual-die design (2x 71 mm²), whereas the 8745HX has 6,570 million transistors on a single 71 mm² die. The most significant architectural divergence is in the L3 cache. The 7945HX3D features 128 MB of shared L3 cache, including a dedicated "1x 64MB Slice" of 3D V-Cache, while the 8745HX has only 32 MB of shared L3 cache. This massive cache advantage is a major reason for the 7945HX3D's dominance in data-heavy workloads. Both chips have identical L1 (64 KB per core) and L2 (1 MB per core) caches, and both feature Radeon 610M integrated graphics. One notable difference: the 7945HX3D supports ECC memory, while the 8745HX does not.

Where Each One Wins

The 7945HX3D wins every single benchmark in the head-to-head comparison, but the magnitude of those wins tells a story about where each processor excels. The 7945HX3D's largest victory is in the PassMark find prime numbers test, where it scores 446 versus the 8745HX's 159, a 64.3% advantage. This indicates a massive lead in pure integer throughput, likely benefiting from the larger cache and higher core count. Similarly, in PassMark physics (4321 vs 1681, a 61.1% gap) and integer math (201217 vs 100328, a 50.1% gap), the 7945HX3D crushes the 8745HX. The 7945HX3D also wins the data compression test by 48% (699988 vs 363759) and encryption by 48.5% (42367 vs 21840). These results point to the 7945HX3D being the superior choice for any workload that saturates multiple cores, including video rendering, scientific simulations, and database processing. The 8745HX's only competitive area is single-thread performance: its PassMark single-thread score of 3879 lags only 4.2% behind the 7945HX3D's 4050. This suggests that for everyday tasks like web browsing, office applications, or older games that rely on single-core speed, the 8745HX will feel nearly identical to the 7945HX3D. The 8745HX's higher base clock (3.60 GHz vs 2.30 GHz) likely contributes to this relative strength.

FAQ

Q: Which processor has more cores and threads?

A: The AMD Ryzen 9 7945HX3D has 16 cores and 32 threads, while the AMD Ryzen 7 8745HX has 8 cores and 16 threads.

Q: How much larger is the L3 cache on the 7945HX3D?

A: The 7945HX3D has 128 MB of shared L3 cache, which includes a 1x 64MB 3D V-Cache slice, compared to the 8745HX's 32 MB of shared L3 cache.

Q: Is the 8745HX faster in any benchmark?

A: No. The head-to-head data shows the 7945HX3D wins all 11 benchmark comparisons, including single-thread tests, albeit by a slim margin there.

Q: What is the difference in their release dates?

A: The 8745HX was released on 2025-04-22, while the 7945HX3D was released earlier on 2023-07-26.

Q: Do both processors support ECC memory?

A: No. The 7945HX3D supports ECC memory, while the 8745HX does not.

Q: Which processor has a higher boost clock?

A: The 7945HX3D has a higher boost clock of 5.40 GHz, compared to the 8745HX's 5.10 GHz. However, the 8745HX has a higher base clock of 3.60 GHz versus 2.30 GHz.

Head-to-Head Benchmarks

The benchmark data shows a consistent, overwhelming victory for the 7945HX3D. The largest single win is in the PassMark find prime numbers test, where the 7945HX3D scores 446 versus the 8745HX's 159, a delta of -64.3%. This test is highly sensitive to cache size and core count, making it a clear demonstration of the V-Cache advantage. The physics test follows closely, with the 7945HX3D scoring 4321 against the 8745HX's 1681, a 61.1% gap, indicating a huge lead in simulating real-world physical interactions. In integer math, the 7945HX3D nearly doubles the 8745HX's score (201217 vs 100328, a 50.1% delta), and in floating-point math, it posts a 49% advantage (121619 vs 61972). Data encryption shows a 48.5% gap (42367 vs 21840), while data compression is 48% higher for the 7945HX3D (699988 vs 363759). Extended instructions follow at 47.2% (52310 vs 27638), and random string sorting at 47% (83919 vs 44494). The multithread score, which is a broad measure of overall parallel performance, shows the 7945HX3D at 57476 versus 31517, a 45.2% advantage. The smallest gap is in single-thread performance, where the 7945HX3D scores 4050 versus the 8745HX's 3879, a delta of only 4.2%. This near-parity in single-thread tests is the only area where the 8745HX remains competitive, suggesting that its higher base clock and newer design help mitigate the core count disadvantage for lighter workloads.

Specification Differences

The most critical difference is the core and thread count: the 7945HX3D has 16 cores and 32 threads, while the 8745HX has 8 cores and 16 threads. The 7945HX3D also has a higher boost clock (5.40 GHz vs 5.10 GHz) but a much lower base clock (2.30 GHz vs 3.60 GHz). The cache configuration is starkly different: the 7945HX3D has 128 MB of shared L3 cache with a 1x 64MB 3D V-Cache slice, whereas the 8745HX has 32 MB. The transistor count and die size reflect the core disparity: 17,840 million transistors on 2x 71 mm² for the 7945HX3D, versus 6,570 million on a single 71 mm² for the 8745HX. The 7945HX3D supports ECC memory, while the 8745HX does not. Their release dates differ significantly, with the 8745HX launching on 2025-04-22 and the 7945HX3D on 2023-07-26. Both share the same TDP of 55 W, socket (AMD Socket FL1), memory support (DDR5, dual-channel, 83.2 GB/s), PCIe configuration (Gen 5, 28 lanes), integrated graphics (Radeon 610M), and have unlocked multipliers. The series names also differ, with the 8745HX in the 8000 series and the 7945HX3D in the 7000 series, and the part numbers are 100-000001851 and 100-000001086, respectively.