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

The AMD Ryzen 7 7840HS and AMD Ryzen 7 5800XT are both 8-core, 16-thread processors, but they are built for entirely different platforms and purposes. The 7840HS is a mobile part from the 7000 series, while the 5800XT is a desktop chip from the 5000 series. The benchmark data reveals a split decision: the 7840HS wins 11 head-to-head tests, while the 5800XT takes 10. Their average benchmark scores are nearly identical, with the 7840HS at 29955 and the 5800XT at 29879, a difference of just 0.3%. This makes the choice between them less about raw overall performance and more about which specific workloads matter to you.

Head-to-Head Benchmarks

The most dramatic difference appears in Cinebench results, where the 5800XT dominates. In Cinebench R23 multi-core, the 5800XT scores 23794 against the 7840HS’s 15102, a massive 36.5% advantage. The single-core gap is even more extreme: the 5800XT hits 3359 while the 7840HS manages only 1761, a 47.6% deficit. This is mirrored in Cinebench R15, where the 5800XT leads by 7.3% in multi-core (2398 vs 2222.84) and 18.9% in single-core (338 vs 274). If your workflow relies on Cinebench-style rendering, the desktop chip is the clear winner, and the margin is not small.

However, the 7840HS fights back in other areas. In PassMark floating point math, it scores 59921 versus the 5800XT’s 53808, a 11.4% lead. It also wins in integer math (98682 vs 93942, 5% ahead) and random string sorting (40364 vs 35911, 12.4% ahead). The 7840HS also has the edge in PassMark single-thread performance, scoring 3753 against 3535, a 6.2% advantage. In 3DMark tests, the two split results: the 5800XT wins the 16-thread (7683 vs 7314, 4.8% ahead) and max-thread (7680 vs 7316, 4.7% ahead) tests, but the 7840HS takes the 2-thread (1904 vs 1879, 1.3%) and single-thread (979 vs 959, 2.1%) tests.

The 5800XT also shows strength in specific PassMark workloads. It wins data compression by 1.8% (352002 vs 345536) and data encryption by 3.9% (21461 vs 20627). The prime number finding test is a 26.1% win for the 5800XT (119 vs 88). Meanwhile, the 7840HS wins extended instructions by 6.1% (25747 vs 24270) and physics by 1.5% (1376 vs 1355). The overall picture is that the 5800XT is a rendering monster, while the 7840HS excels in mixed mathematical and integer-heavy tasks.

Where Each One Wins

The 5800XT is the pick for sustained multi-threaded rendering and video encoding, as evidenced by its massive Cinebench R23 multi-core lead. Its high TDP of 105 watts compared to the 7840HS’s 35 watts suggests it can maintain high clocks under load, which the Cinebench results confirm. It also wins in data compression and encryption, making it suitable for archival work or database tasks. If you need a desktop system that crunches through long render jobs, the data points squarely at the 5800XT.

The 7840HS wins in single-threaded and light-threaded tasks, taking the 3DMark 2-thread and single-thread tests. Its PassMark single-thread score of 3753 is 6.2% higher, which translates to snappier everyday application performance. It also leads in floating point and integer math, plus random string sorting, suggesting strength in scientific computing and data manipulation. For a mobile user who needs a laptop that handles code compilation, spreadsheet calculations, or general productivity, the 7840HS is the better fit. The 7840HS also includes Radeon 780M integrated graphics, whereas the 5800XT has none, meaning the mobile chip can handle light gaming or display output without a discrete GPU.

FAQ

Q: Which CPU has the higher boost clock?

A: The AMD Ryzen 7 7840HS has a boost clock of 5.10 GHz, while the AMD Ryzen 7 5800XT boosts to 4.80 GHz.

Q: Does the 5800XT support DDR5 memory?

A: No, the 5800XT supports DDR4 memory, while the 7840HS supports DDR5.

Q: Which processor has more L3 cache?

A: The 5800XT has 32 MB of shared L3 cache, which is double the 16 MB shared L3 cache on the 7840HS.

Q: Is the 5800XT overclockable?

A: Yes, the 5800XT has an unlocked multiplier, while the 7840HS does not.

Q: What is the memory bandwidth difference between the two?

A: The 7840HS has a memory bandwidth of 89.6 GB/s, compared to 51.2 GB/s for the 5800XT.

Specification Differences

The two CPUs differ in almost every physical specification. The 7840HS uses AMD Socket FP8, while the 5800XT uses AMD Socket AM4. The 7840HS is a mobile processor with a 35 watt TDP, whereas the 5800XT is a desktop part with a 105 watt TDP. Their base clocks are identical at 3.80 GHz, but the boost clocks differ (5.10 GHz vs 4.80 GHz). Memory support is split: the 7840HS uses DDR5, the 5800XT uses DDR4. Both are dual-channel, but the 7840HS has higher memory bandwidth at 89.6 GB/s versus 51.2 GB/s. The 7840HS includes Radeon 780M integrated graphics, while the 5800XT has no integrated graphics. The 5800XT has an unlocked multiplier, but the 7840HS does not. The 5800XT also has a launch MSRP listed at $249, and its release date is 2024-07-30.

Architecture Differences

These are fundamentally different architectures. The 7840HS is based on Zen 4 with the Phoenix codename, built on a 4 nm process at TSMC. It contains 25,000 million transistors on a 178 mm² die. The 5800XT uses Zen 3 with the Vermeer codename, built on a 7 nm process at TSMC, with 4,150 million transistors on a 74 mm² die. Cache configurations differ: both have 64 KB of L1 per core, but the 7840HS has 1 MB of L2 per core versus 512 KB per core on the 5800XT. The 5800XT compensates with 32 MB of shared L3, twice the 7840HS’s 16 MB. Both support ECC memory and PCIe Gen 4 with 20 CPU lanes. The 7840HS is a 7000 series part, while the 5800XT is from the 5000 series.

The Verdict

The data paints a clear picture for different users. If you are building a desktop PC for heavy rendering workloads, the 5800XT is the obvious choice. Its Cinebench R23 multi-core score is 36.5% higher, and it wins in data compression and encryption. It is also the only one of the two with an unlocked multiplier, which is relevant for overclocking. Its 32 MB of L3 cache likely contributes to its strong Cinebench performance. The 5800XT is a raw compute workhorse.

Conversely, the 7840HS is the better all-rounder for mobile use. It wins in PassMark single-thread, floating point, integer math, and random string sorting, with leads ranging from 5% to 12.4%. It also has integrated Radeon 780M graphics, which the 5800XT lacks entirely. Its lower 35 watt TDP makes it suitable for laptops, and its higher memory bandwidth (89.6 GB/s) supports its DDR5 memory. The 7840HS is the pick for portable productivity and mixed workloads, while the 5800XT is for dedicated rendering stations. The 81st percentile ranking for both CPUs shows they are competitive in their respective segments, but the right choice depends entirely on your platform and workload priorities.