AMD Ryzen 7 5700X3D vs AMD Ryzen 7 8840U Comparison

The AMD Ryzen 7 8840U and AMD Ryzen 7 5700X3D represent two distinct design philosophies from the same manufacturer. The 8840U is a mobile-first, power-efficient processor built on a modern 4 nm process, while the 5700X3D is a desktop-focused chip designed for maximum sustained throughput with a massive cache. The recorded data shows a clear split: the 5700X3D wins 14 of the 23 head-to-head benchmark comparisons, while the 8840U takes 9. The 5700X3D also holds a higher average benchmark score of 24709 compared to the 8840U's 23982, and it sits at the 77th percentile versus the 76th percentile for the 8840U. These are not interchangeable parts; they serve different workloads and system types.

The Verdict

The AMD Ryzen 7 5700X3D is the stronger overall performer in the database's measurements. Its average benchmark score of 24709 is 3% higher than the 8840U's 23982, and it wins the majority of the head-to-head tests. The 5700X3D is the pick for users who need maximum multi-threaded compute, cache-sensitive workloads, and sustained performance in a desktop platform. Its wins in Cinebench R23 multicore (22366 vs 12972, a 42% advantage) and PassMark physics (2686 vs 1176, a 56.2% advantage) demonstrate a substantial lead in heavily threaded and physics-based tasks.

The AMD Ryzen 7 8840U is the choice for single-thread responsiveness and specific math workloads, and it is the only one of the two with integrated graphics. It wins the 3DMark single-thread test (979 vs 804, a 21.8% advantage) and the PassMark single-thread test (3543 vs 2970, a 19.3% advantage). It also leads in floating-point math (48820 vs 46492, a 5% advantage) and integer math (85740 vs 81257, a 5.5% advantage). The 8840U is the appropriate selection for a mobile or compact system where its 28 W TDP and Radeon 780M integrated graphics are essential, and where single-thread performance is prioritized.

Architecture Differences

The two processors differ fundamentally in their underlying design. The 8840U is built on the Zen 4 architecture using a 4 nm process at TSMC, with a die size of 178 mm² and 25,000 million transistors. The 5700X3D uses the older Zen 3 architecture on a 7 nm process, also at TSMC, with a much smaller die size of 74 mm² and 8,850 million transistors. The 8840U's newer process node allows for higher efficiency, reflected in its 28 W TDP, while the 5700X3D consumes 105 W.

Cache configuration is a major differentiator. The 8840U has 1 MB of L2 cache per core and 16 MB of shared L3 cache. The 5700X3D has 512 KB of L2 cache per core but a massive 96 MB of shared L3 cache. This 80 MB difference in L3 is the defining feature of the 5700X3D and explains its dominance in cache-sensitive benchmarks. Both processors have 8 cores and 16 threads, but the 8840U has a higher base clock of 3.30 GHz and boost clock of 5.10 GHz, compared to the 5700X3D's 3.00 GHz base and 4.10 GHz boost.

Memory support also diverges. The 8840U supports DDR5 memory with a bandwidth of 89.6 GB/s, while the 5700X3D supports DDR4 with a bandwidth of 51.2 GB/s. The 8840U does not support ECC memory, while the 5700X3D does. The 8840U is a mobile part on AMD Socket FP8, while the 5700X3D is a desktop part on AMD Socket AM4. The 8840U includes integrated Radeon 780M graphics, whereas the 5700X3D has no integrated graphics. Both use PCIe Gen 4 with 20 lanes.

Where Each One Wins

The 5700X3D wins in the majority of multi-threaded and cache-heavy workloads. Its 96 MB of L3 cache provides a significant advantage in tasks that repeatedly access large datasets. The data shows wins in Cinebench R23 multicore (22366 vs 12972, a 42% lead), Geekbench multicore (11086 vs 9610, a 13.3% lead), and PassMark multithread (26318 vs 23346, an 11.3% lead). It also dominates in PassMark find prime numbers (224 vs 78, a 65.2% lead) and PassMark physics (2686 vs 1176, a 56.2% lead). These results indicate a processor that excels in rendering, scientific computing, and any workload that scales with thread count and cache capacity.

The 8840U wins in single-thread and specific math operations. Its higher boost clock of 5.10 GHz gives it an edge in lightly threaded tasks. The 3DMark single-thread score of 979 is 21.8% higher than the 5700X3D's 804, and the PassMark single-thread score of 3543 is 19.3% higher than 2970. The 8840U also wins in 3DMark 2-threads (1863 vs 1575, an 18.3% lead) and 3DMark 4-threads (3289 vs 3097, a 6.2% lead). In PassMark floating-point math, it scores 48820 versus 46492, a 5% lead, and in integer math it scores 85740 versus 81257, a 5.5% lead. The 8840U also wins in random string sorting (32158 vs 31492, a 2.1% lead). This makes it the better choice for responsive single-threaded applications and certain numerical workloads.

FAQ

Q: Which processor has the higher average benchmark score?

A: The AMD Ryzen 7 5700X3D has an average benchmark score of 24709, which is higher than the AMD Ryzen 7 8840U's 23982.

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

A: The 8840U leads in single-thread tests. It scores 979 in 3DMark single-thread versus 804 for the 5700X3D, a 21.8% advantage, and 3543 in PassMark single-thread versus 2970, a 19.3% advantage.

Q: Which processor has more L3 cache?

A: The AMD Ryzen 7 5700X3D has 96 MB of shared L3 cache, while the AMD Ryzen 7 8840U has 16 MB of shared L3 cache.

Q: Does the AMD Ryzen 7 8840U have integrated graphics?

A: Yes, the 8840U includes Radeon 780M integrated graphics. The 5700X3D has no integrated graphics.

Q: What memory types do these processors support?

A: The 8840U supports DDR5 memory with a bandwidth of 89.6 GB/s. The 5700X3D supports DDR4 memory with a bandwidth of 51.2 GB/s.

Q: Which processor has a higher TDP?

A: The AMD Ryzen 7 5700X3D has a TDP of 105 W, which is significantly higher than the 8840U's 28 W.

Head-to-Head Benchmarks

The largest win for the 5700X3D comes in Cinebench R23 singlecore, where it scores 3157 against the 8840U's 1703, a 46.1% advantage. This is a surprising result given the 8840U's higher boost clock, but the data is clear. The 5700X3D also wins Cinebench R23 multicore by a 42% margin (22366 vs 12972). In PassMark find prime numbers, the 5700X3D scores 224 versus 78, a 65.2% lead, and in PassMark physics it scores 2686 versus 1176, a 56.2% lead. These are the most decisive victories in the entire comparison.

The 8840U's biggest wins are in single-thread and low-thread-count tests. In 3DMark single-thread, it scores 979 versus 804, a 21.8% lead. In PassMark single-thread, it scores 3543 versus 2970, a 19.3% lead. The 8840U also wins 3DMark 2-threads by 18.3% (1863 vs 1575) and 3DMark 4-threads by 6.2% (3289 vs 3097). In PassMark integer math, the 8840U scores 85740 versus 81257, a 5.5% lead, and in floating-point math it scores 48820 versus 46492, a 5% lead.

The 5700X3D wins the remaining multi-threaded tests. In 3DMark 16-threads, it scores 6764 versus 5691, a 15.9% lead. In 3DMark 8-threads, it scores 5357 versus 4896, an 8.6% lead. In 3DMark max-threads, it scores 6755 versus 5677, a 16% lead. In Cinebench R15 multicore, it scores 2254 versus 2024, a 10.2% lead. In Geekbench multicore, it scores 11086 versus 9610, a 13.3% lead. In PassMark data compression, it scores 307237 versus 267525, a 12.9% lead. In PassMark data encryption, it scores 18788 versus 16072, a 14.5% lead. In PassMark extended instructions, it scores 21202 versus 18654, a 12% lead. In PassMark multithread, it scores 26318 versus 23346, an 11.3% lead.

The only Cinebench R15 singlecore test is won by the 5700X3D, with a score of 318 versus 266, a 16.4% lead. This is notable because it contradicts the 8840U's wins in other single-thread tests, but the recorded data shows the 5700X3D ahead in this specific workload. Overall, the 5700X3D's 14 wins versus the 8840U's 9 wins, combined with its higher average score, establishes it as the more capable processor in the database's measurements.