AMD Ryzen 7 5800XT vs AMD Ryzen 7 7840H Comparison

The AMD Ryzen 7 5800XT and AMD Ryzen 7 7840H are both 8-core, 16-thread processors, but they represent two distinct generations of AMD’s architecture. The 5800XT is a desktop part built on Zen 3, while the 7840H is a mobile chip using Zen 4. The head-to-head benchmark data reveals a fascinating split: the older desktop chip wins 14 of 23 tests, while the newer mobile chip takes 9. However, the average benchmark scores are nearly identical, with the 5800XT at 29879 and the 7840H at 29868, a difference of just 0.04%. This near-parity suggests that architectural efficiency and power constraints play a larger role than raw generational advantages, and the data shows a clear pattern of where each chip excels.

Head-to-Head Benchmarks

The most dramatic win for the Ryzen 7 5800XT comes in the PassMark find prime numbers test, where it scores 119 versus the 7840H’s 83, a 43.4% advantage. This is a massive gap in a single-threaded workload that heavily favors the desktop chip’s higher sustained clock behavior. Similarly, the 5800XT leads in data encryption, scoring 21461 against 20162, a 6.4% margin, and in data compression, with 352002 versus 341520, a 3.1% win. These results indicate that the desktop part’s 105W TDP allows it to maintain performance in bursty, integer-heavy tasks.

The 7840H’s biggest victories are in floating-point math and random string sorting. It scores 58724 in floating-point math versus 53808, an 8.4% advantage, and 38938 in random string sorting versus 35911, a 7.8% lead. It also wins extended instructions, 25654 against 24270, a 5.4% margin. These wins suggest the Zen 4 architecture in the mobile chip has a more efficient execution pipeline for these specific workloads, despite running at a much lower 35W TDP.

In multi-threaded Cinebench tests, the 5800XT edges out the 7840H consistently, but by very slim margins. In Cinebench R23 multi-core, the 5800XT scores 23794 versus 23731, a 0.3% lead. The same 0.3% margin appears in Cinebench R15 multi-core (2398 vs 2392) and R20 multi-core (9993 vs 9967). The 5800XT also wins 3DMark’s 16-thread test (7683 vs 7461, 3% lead) and max-threads test (7680 vs 7409, 3.7% lead). These results indicate that the desktop chip’s higher power budget allows it to sustain multi-core performance better than the mobile part, even though the mobile part has a newer architecture.

The 7840H, however, takes the single-threaded crown in several tests. It wins 3DMark single-thread (976 vs 959, 1.7% lead), PassMark single-thread (3641 vs 3535, 2.9% lead), and PassMark singlethread (same scores). It also wins 3DMark 2-thread (1906 vs 1879, 1.4% lead) and 3DMark 4-thread (3638 vs 3603, 1% lead). The 5800XT only wins the 8-thread 3DMark test (6141 vs 6116, 0.4% lead). The data implies that the Zen 4 architecture in the 7840H has a higher boost clock of 5.10 GHz versus the 5800XT’s 4.80 GHz, which directly translates to better light-thread performance.

FAQ

Q: Which processor has a higher average benchmark score?

A: The AMD Ryzen 7 5800XT has an average benchmark score of 29879, while the AMD Ryzen 7 7840H has an average score of 29868. The difference is only 11 points, meaning the two chips are statistically tied in overall performance.

Q: How do the two chips compare in multi-threaded Cinebench R23?

A: The Ryzen 7 5800XT scores 23794 in Cinebench R23 multi-core, while the Ryzen 7 7840H scores 23731. This gives the 5800XT a 0.3% advantage, which is a negligible real-world difference.

Q: Is the Ryzen 7 7840H better at single-threaded tasks?

A: Yes, the data shows the 7840H wins 3DMark single-thread (976 vs 959), PassMark single-thread (3641 vs 3535), and PassMark singlethread (3641 vs 3535). This is likely due to its higher boost clock of 5.10 GHz versus the 5800XT’s 4.80 GHz.

Q: Which processor has the largest benchmark win margin?

A: The largest margin is in PassMark find prime numbers, where the Ryzen 7 5800XT scores 119 versus the 7840H’s 83, a 43.4% advantage for the desktop chip.

Q: What is the difference in TDP between the two chips?

A: The Ryzen 7 5800XT has a TDP of 105, while the Ryzen 7 7840H has a TDP of 35. This 70-point difference explains why the desktop chip can sustain higher multi-core performance despite having an older architecture.

Q: Do both processors support ECC memory?

A: Yes, both the Ryzen 7 5800XT and the Ryzen 7 7840H have ECC memory support listed in their specifications.

Architecture Differences

The architectural chasm between these two chips is vast, explaining the benchmark behavior. The Ryzen 7 5800XT is built on Zen 3 architecture with the codename Vermeer, using a 7 nm process node from TSMC. It has 8 cores and 16 threads, with a base clock of 3.80 GHz and a boost clock of 4.80 GHz. The cache layout includes 64 KB of L1 per core, 512 KB of L2 per core, and a 32 MB shared L3 cache. This chip uses DDR4 memory with a dual-channel bus and a memory bandwidth of 51.2 GB/s.

In contrast, the Ryzen 7 7840H is built on Zen 4 architecture with the codename Phoenix, using a much smaller 4 nm process node from TSMC. It also has 8 cores and 16 threads, with the same base clock of 3.80 GHz but a higher boost clock of 5.10 GHz. The cache structure differs significantly: L1 is still 64 KB per core, but L2 is doubled to 1 MB per core, and L3 is halved to 16 MB shared. The 7840H supports DDR5 memory with a dual-channel bus and a much higher memory bandwidth of 89.6 GB/s.

The transistor counts are dramatically different, with the 5800XT sporting 4,150 million transistors on a 74 mm² die, while the 7840H packs 25,000 million transistors on a 178 mm² die. This reflects the density improvements of the 4 nm node. The 7840H also integrates Radeon 780M graphics, whereas the 5800XT has no integrated graphics. The 7840H uses the AMD Socket FP8 (with multiple part numbers for FP7r2 and FP7), while the 5800XT uses the desktop AMD Socket AM4. The 5800XT has an unlocked multiplier, while the 7840H is locked.

The Verdict

The benchmark data tells a story of trade-offs rather than a clear winner. The Ryzen 7 5800XT wins 14 tests, but its victories in multi-threaded Cinebench and 3DMark workloads are marginal, often under 1%. Its significant wins are in specific integer-heavy tasks like prime number finding (43.4% lead) and data encryption (6.4% lead). This chip is the better choice for workloads that involve sustained multi-core processing and bursty integer operations.

The Ryzen 7 7840H, despite losing more tests, wins in single-threaded performance and floating-point math. Its 8.4% lead in floating-point math and 7.8% lead in random string sorting show that Zen 4’s efficiency is real. The data suggests that for users who prioritize light-thread responsiveness and specific FP-heavy tasks, the 7840H is the superior option. The near-identical average scores (29879 vs 29868) mean that in general-purpose computing, the user will not notice a difference.

The desktop 5800XT’s higher TDP of 105 versus the mobile 7840H’s 35 TDP is the defining factor. The desktop chip can draw more power to maintain performance, while the mobile chip must stay within its power envelope. The 5800XT is the pick for desktop users with an AM4 motherboard who want maximum multi-threaded capability. The 7840H is the pick for laptop or mini-PC users who need a power-efficient chip with strong single-thread and FP performance.

Specification Differences

The two chips differ across nearly every major specification category. The Ryzen 7 5800XT belongs to the 5000 series, while the 7840H is in the 7000 series. The 5800XT uses the AM4 socket, while the 7840H uses the FP8 socket. The 5800XT is Zen 3 (Vermeer), and the 7840H is Zen 4 (Phoenix). The process node differs: 7 nm for the 5800XT versus 4 nm for the 7840H. The 5800XT has 4,150 million transistors on a 74 mm² die, while the 7840H has 25,000 million transistors on a 178 mm² die.

The L2 cache differs, with the 5800XT having 512 KB per core and the 7840H having 1 MB per core. The L3 cache is reversed, with the 5800XT having 32 MB shared and the 7840H having 16 MB shared. Memory support differs: the 5800XT uses DDR4 with 51.2 GB/s bandwidth, while the 7840H uses DDR5 with 89.6 GB/s bandwidth. The 5800XT has no integrated graphics, while the 7840H includes Radeon 780M. The boost clocks differ (4.80 GHz vs 5.10 GHz), and the TDP differs dramatically (105 vs 35). The 5800XT is unlocked for overclocking, while the 7840H is locked. The 5800XT has a launch MSRP of $249, while the 7840H has no launch MSRP listed.

Where Each One Wins

The Ryzen 7 5800XT wins in multi-threaded scenarios that require sustained throughput. It leads in all three Cinebench multi-core tests (R15, R20, R23) by 0.3%, and in 3DMark 16-thread (3% lead) and max-thread (3.7% lead). It also wins PassMark multi-thread (28053 vs 27919, 0.5% lead) and PassMark physics (1355 vs 1301, 4.2% lead). Its biggest wins are in data compression (3.1%), data encryption (6.4%), and prime number finding (43.4%). This chip is the clear winner for encoding, rendering, and other heavily parallel integer workloads.

The Ryzen 7 7840H wins in single-threaded and light-thread scenarios, plus FP-heavy tasks. It leads in 3DMark single-thread (1.7%), 2-thread (1.4%), and 4-thread (1%) tests. It wins PassMark single-thread and singlethread by 2.9%, and PassMark integer math (96692 vs 93942, 2.8% lead). Its most significant victories are in floating-point math (8.4% lead), random string sorting (7.8% lead), and extended instructions (5.4% lead). This chip is the better option for everyday responsiveness, scientific calculations, and any workload that relies on FPU performance. The 7840H’s integrated Radeon 780M also gives it an edge in systems without a discrete GPU, a feature the 5800XT entirely lacks.