AMD Ryzen 9 5900X vs AMD Ryzen 9 7940H Comparison

Head-to-Head Benchmarks

The recorded data reveals a sharp split between these two AMD processors. The desktop-oriented Ryzen 9 5900X dominates the majority of the shared workload tests, while the mobile Ryzen 9 7940H takes a decisive lead in single-threaded and certain multi-threaded rendering tasks.

Starting with the most lopsided result, the Ryzen 9 5900X posts a 217.3% advantage in PassMark's find prime numbers test, scoring 257 versus the 7940H's 81. This is the largest margin in the entire comparison. The desktop chip also wins PassMark data encryption by 47.4%, scoring 31106 versus 21096, and PassMark physics by 53.4%, at 1994 versus 1300. In integer math, the 5900X leads 140851 to 101977, a 38.1% gap. Floating point math goes the same way: 77700 versus 62057, a 25.2% delta. The PassMark multithread score favors the 5900X at 39002 versus 29063, a 34.2% edge. Data compression sees a 42% win for the 5900X, 499968 versus 352077. Extended instructions favor the desktop part by 23.6%, 33119 versus 26804, and random string sorting by 22.7%, 51646 versus 42093.

The Ryzen 9 7940H, however, wins the tests that lean on per-core efficiency and newer architecture. In Cinebench R23 single-core, the mobile chip scores 3487 against the 5900X's 1527, a 56.2% lead. Cinebench R15 single-core also goes to the 7940H, 351 versus 250, a 28.8% margin. PassMark single-thread shows a 12.2% win for the 7940H, 3952 versus 3469. Interestingly, the 7940H also wins Cinebench R23 multi-core, scoring 24703 versus 16262, a 34.2% advantage, despite having fewer cores. In Cinebench R15 multi-core, the 5900X fights back with a narrow 8.2% win, 2695 versus 2490.

The overall win count stands at 10 for the 5900X and 5 for the 7940H across the shared benchmarks, but that tally hides the qualitative difference: the 7940H's wins are concentrated in the most modern rendering and single-thread metrics.

The Verdict

The data points to two different user profiles. The Ryzen 9 5900X is the stronger choice for workloads that rely on raw multi-core throughput across many threads, particularly math-heavy, encryption, and compression tasks. Its PassMark multithread score of 39002 is 34.2% above the 7940H, and its data encryption result is 47.4% higher. The 217.3% lead in prime number finding is almost absurdly large, indicating a fundamental advantage in certain integer-heavy algorithms.

The Ryzen 9 7940H, by contrast, is the pick for anyone whose applications depend on single-core speed and the latest rendering engine. Its Cinebench R23 single-core score of 3487 is 56.2% above the 5900X, and its R23 multi-core score is 34.2% higher despite using only 8 cores versus 12. This suggests that for newer, well-threaded workloads, the 7940H's architecture is significantly more efficient per core.

Both processors sit at the 87th percentile among all CPUs in the database, and their average benchmark scores are close: 41376 for the 5900X against 40431 for the 7940H. The 5900X's nearest rivals include the Intel Core Ultra 7 366H and Intel Core i7-14650HX, while the 7940H sits near the Intel Core i9-13905H and Intel Xeon parts. Neither chip is a clear overall winner; they are specialized tools.

Architecture Differences

The underlying designs could hardly be more different. The Ryzen 9 5900X uses the Zen 3 architecture, codenamed Vermeer, built on a 7 nm process at TSMC. The Ryzen 9 7940H uses Zen 4, codenamed Phoenix, on a 4 nm process, also at TSMC. The node shrink is substantial, and the transistor counts reflect it: the 5900X packs 8,300 million transistors across a die size of 2x 74 mm², while the 7940H integrates 25,000 million transistors on a single 178 mm² die.

Core counts differ as well. The 5900X has 12 cores and 24 threads, while the 7940H has 8 cores and 16 threads. The 7940H compensates with a higher base clock of 4.00 GHz versus 3.70 GHz, and a higher boost clock of 5.20 GHz versus 4.80 GHz. The thermal design power tells the mobility story: the 7940H is rated at 35 W, while the 5900X is rated at 105 W.

Cache hierarchies diverge sharply. Both share a 64 KB L1 per core, but the L2 differs: 512 KB per core on the 5900X versus 1 MB per core on the 7940H. L3 is the bigger split: the 5900X has 64 MB, while the 7940H has only 16 MB shared. This is a large difference that likely explains some of the 5900X's wins in data-heavy workloads.

Memory support also differs. The 5900X uses DDR4 with dual-channel memory and a bandwidth of 51.2 GB/s. The 7940H uses DDR5, also dual-channel, but with a bandwidth of 89.6 GB/s. Both support ECC memory. PCIe generation is Gen 4 for both, but the 7940H specifies 20 lanes (CPU only), while the 5900X does not list a lane count.

The 7940H includes integrated Radeon 780M graphics; the 5900X has no integrated graphics. The sockets are incompatible: the 5900X uses AMD Socket AM4, while the 7940H uses AMD Socket FP8. The 5900X has an unlocked multiplier; the 7940H is locked. The 5900X is a desktop part with a launch MSRP of $549, while the 7940H is a mobile part with no launch MSRP recorded.

FAQ

Q: Which processor is faster in single-core performance?

A: The Ryzen 9 7940H. It wins Cinebench R23 single-core by 56.2% (3487 versus 1527), Cinebench R15 single-core by 28.8% (351 versus 250), and PassMark single-thread by 12.2% (3952 versus 3469).

Q: Does the 5900X win any multi-core test?

A: Yes. It wins Cinebench R15 multi-core by 8.2% (2695 versus 2490). However, the 7940H wins Cinebench R23 multi-core by 34.2% (24703 versus 16262), the newer and more demanding rendering test.

Q: Why does the 7940H win Cinebench R23 multi-core despite having fewer cores?

A: The 7940H has a newer Zen 4 architecture on a 4 nm process, higher clocks (4.00 GHz base, 5.20 GHz boost), and a larger L2 cache per core (1 MB versus 512 KB). The data shows its per-core efficiency is sufficient to overcome the 5900X's 12-core versus 8-core advantage in this specific workload.

Q: Which chip handles encryption and compression better?

A: The Ryzen 9 5900X. It leads data encryption by 47.4% (31106 versus 21096) and data compression by 42% (499968 versus 352077). Its larger 64 MB L3 cache likely plays a role here.

Q: Are these two chips comparable in overall standing?

A: Yes, both sit at the 87th percentile among all CPUs in the database. The 5900X has an average benchmark score of 41376, while the 7940H scores 40431. Their nearest rivals are different, though: the 5900X competes with Intel Core Ultra 7 parts, while the 7940H sits near Intel Core i9 and Xeon models.

Q: Which processor has integrated graphics?

A: Only the Ryzen 9 7940H. It includes Radeon 780M integrated graphics. The Ryzen 9 5900X has no integrated graphics, so it requires a discrete GPU.

Where Each One Wins

The Ryzen 9 5900X is the clear winner for computational brute force across a wide range of PassMark subtests. It wins integer math by 38.1%, floating point math by 25.2%, physics by 53.4%, and random string sorting by 22.7%. For users running simulations, data processing pipelines, or any workload that stresses parallel integer and floating-point execution, the recorded scores favor the desktop part. Its 64 MB of L3 cache appears to be a decisive factor in data compression and encryption, where it leads by 42% and 47.4%, respectively. The prime number finding test, with its 217.3% margin, suggests the 5900X has a particular strength in algorithms that rely on large in-cache datasets.

The Ryzen 9 7940H wins where single-thread speed and modern rendering efficiency matter. Its Cinebench R23 single-core score is more than double the 5900X's, and its R23 multi-core score is higher despite fewer cores. This makes it the better choice for applications built around the latest rendering engines, such as newer 3D modeling software or video encoding that scales well per core. The 7940H's 89.6 GB/s memory bandwidth, nearly double the 5900X's 51.2 GB/s, also suggests an advantage in memory-hungry tasks. Its integrated Radeon 780M graphics means it can handle display output and light graphics work without a dedicated GPU, which is impossible on the 5900X.

Specification Differences

The two processors differ in nearly every major specification. The 5900X is part of the 5000 series with a Zen 3, Vermeer architecture, while the 7940H is from the 7000 series with a Zen 4, Phoenix architecture. Process nodes are 7 nm versus 4 nm. Transistor counts are 8,300 million versus 25,000 million. Die sizes are 2x 74 mm² versus 178 mm².

Core and thread counts: 12 cores and 24 threads versus 8 cores and 16 threads. Base clocks are 3.70 GHz versus 4.00 GHz, and boost clocks are 4.80 GHz versus 5.20 GHz. TDP is 105 W versus 35 W. Sockets are AM4 versus FP8. L2 cache is 512 KB per core versus 1 MB per core. L3 cache is 64 MB versus 16 MB shared. Memory support is DDR4 versus DDR5, with bandwidths of 51.2 GB/s versus 89.6 GB/s. Both support ECC. The 7940H has integrated Radeon 780M graphics; the 5900X does not. The 5900X has an unlocked multiplier; the 7940H is locked. The 5900X is a desktop part with a launch MSRP of $549; the 7940H is a mobile part with no recorded MSRP. The 5900X's release date is recorded as 2020-11-04; the 7940H's release date is not recorded in the database.