AMD Ryzen 7 7735HS vs AMD Ryzen 7 7840U Comparison

The AMD Ryzen 7 7840U and AMD Ryzen 7 7735HS are both 8-core, 16-thread mobile processors from AMD’s 7000 series, but the recorded benchmark data shows two different personalities. The 7840U wins 14 of 23 head-to-head tests, while the 7735HS wins 9. The 7735HS takes the lead in 3DMark threaded workloads and Cinebench multi-core tests, while the 7840U dominates single-thread, PassMark math, and Geekbench results. For users prioritizing multi-threaded rendering or synthetic 3DMark scores, the 7735HS is the stronger choice. For single-core responsiveness, encryption, and physics simulations, the 7840U is clearly ahead.

Where Each One Wins

The 7735HS wins in the 3DMark suite across all multi-threaded tests: 16 threads (6870 vs 5427, a 21% advantage), 4 threads (3382 vs 3029, 10.4% ahead), 8 threads (5697 vs 4583, 19.6% ahead), and max threads (6872 vs 5402, 21.4% ahead). It also wins Cinebench R15 multi-core (2153.4 vs 1990, 7.6% ahead) and Cinebench R23 multi-core (13106 vs 12719, 3% ahead). In PassMark data compression, the 7735HS edges out a win (293278 vs 288604, 1.6% ahead), and in data encryption it wins by 3% (18237 vs 17691). These wins cluster in workloads that scale with sustained multi-core throughput, where the 7735HS’s higher 35W TDP likely provides an advantage over the 7840U’s 28W TDP.

The 7840U wins the remaining 14 tests. Its single-thread victories are decisive: Geekbench single-core (2077 vs 1699, a 22.2% lead), Cinebench R23 single-core (1677.5 vs 1546, 8.5% ahead), Cinebench R15 single-core (264 vs 248, 6.5% ahead), and PassMark single-thread (3565 vs 3296, 8.2% ahead). In multi-core PassMark workloads, the 7840U leads in integer math (90852 vs 85309, 6.5% ahead), floating-point math (51767 vs 47865, 8.2% ahead), multithread (24782 vs 23166, 7% ahead), physics (1256 vs 1073, 17.1% ahead), and random string sorting (33757 vs 30388, 11.1% ahead). The 7840U also wins Geekbench multi-core (8766 vs 8114, 8% ahead), PassMark extended instructions (20432 vs 20050, 1.9% ahead), and PassMark find prime numbers (80 vs 59, a massive 35.6% lead). The 3DMark single-thread test goes to the 7840U (932 vs 912, 2.2% ahead).

The split is clear: the 7735HS is built for sustained multi-threaded tasks like rendering, while the 7840U delivers superior per-core performance and wins in math-heavy and physics-based workloads.

Architecture Differences

The two processors come from different architectural generations. The 7840U uses Zen 4 architecture with the Phoenix codename, fabricated on TSMC’s 4 nm process. The 7735HS uses Zen 3+ architecture with the Rembrandt-R codename, fabricated on TSMC’s 6 nm process. This process difference (4 nm vs 6 nm) is a key factor in the 7840U’s efficiency and higher clock speeds.

Clock speeds differ significantly. The 7840U has a base clock of 3.30 GHz and a boost clock of 5.10 GHz. The 7735HS has a base clock of 3.20 GHz and a boost clock of 4.75 GHz. The 7840U’s 0.35 GHz higher boost clock aligns with its single-thread benchmark wins. TDP also differs: the 7840U is rated at 28W, while the 7735HS is rated at 35W, explaining why the 7735HS can sustain higher multi-threaded scores despite lower clocks per core.

Cache configurations differ in L2 cache. The 7840U has 1 MB of L2 per core, while the 7735HS has 512 KB per core. Both have 64 KB of L1 per core and 16 MB of shared L3 cache. The 7840U’s larger L2 cache likely contributes to its PassMark math wins. Socket types differ: the 7840U uses AMD Socket FP8, while the 7735HS uses AMD Socket FP7. Die size also differs: the 7840U measures 178 mm² with 25,000 million transistors, while the 7735HS measures 210 mm² with no transistor count recorded in the database.

Memory bandwidth favors the 7840U: 89.6 GB/s versus 76.8 GB/s for the 7735HS. Both support DDR5 dual-channel memory and ECC memory. Integrated graphics differ: the 7840U has Radeon 780M, while the 7735HS has Radeon 680M. Both use PCIe Gen 4 with 20 lanes (CPU only), and both have locked multipliers. The 7840U has no recorded release date, while the 7735HS was released on 2023-03-31.

Head-to-Head Benchmarks

The largest win for the 7735HS comes in 3DMark max threads, where it scores 6872 against the 7840U’s 5402, a 21.4% advantage. The 3DMark 16-thread test shows a similar gap: 6870 vs 5427, 21% ahead. The 8-thread test shows 5697 vs 4583, a 19.6% lead. These are the biggest deltas in either direction, indicating the 7735HS scales better with thread count in this synthetic suite.

The 7840U’s largest win is in PassMark find prime numbers, scoring 80 vs 59, a 35.6% lead. This is an extreme outlier that highlights the 7840U’s superior integer processing capability. Geekbench single-core is the second-largest win: 2077 vs 1699, a 22.2% lead. The 7840U also wins Geekbench multi-core by 8% (8766 vs 8114), which is notable because the 7735HS wins Cinebench multi-core tests. The two multi-core benchmarks disagree: Cinebench R23 multi-core favors the 7735HS by 3%, while Geekbench multi-core favors the 7840U by 8%. This suggests different workload sensitivities, with Cinebench rewarding the 7735HS’s sustained power delivery and Geekbench rewarding the 7840U’s per-core efficiency.

In PassMark physics, the 7840U wins by 17.1% (1256 vs 1073), and in random string sorting it wins by 11.1% (33757 vs 30388). Floating-point math goes to the 7840U by 8.2% (51767 vs 47865), matching the single-thread PassMark win of 8.2% (3565 vs 3296). Integer math goes to the 7840U by 6.5% (90852 vs 85309), the same margin as Cinebench R15 single-core (264 vs 248, 6.5%). The 2-thread 3DMark test is close: the 7735HS wins by only 2.5% (1773 vs 1729), and the single-thread 3DMark test goes to the 7840U by 2.2% (932 vs 912). These narrow margins in low-thread tests suggest the two processors are nearly equal in lightly threaded scenarios, with the 7840U’s clock advantage showing only slightly.

FAQ

Q: Which processor has the higher boost clock?

A: The AMD Ryzen 7 7840U has a boost clock of 5.10 GHz, while the AMD Ryzen 7 7735HS has a boost clock of 4.75 GHz.

Q: Which processor wins in Cinebench R23 multi-core?

A: The AMD Ryzen 7 7735HS wins Cinebench R23 multi-core with a score of 13106 versus 12719 for the 7840U, a 3% advantage.

Q: Which processor has the larger L2 cache?

A: The AMD Ryzen 7 7840U has 1 MB of L2 cache per core, while the AMD Ryzen 7 7735HS has 512 KB of L2 cache per core.

Q: What is the memory bandwidth difference?

A: The 7840U has 89.6 GB/s of memory bandwidth, while the 7735HS has 76.8 GB/s. The 7840U offers 12.8 GB/s more bandwidth.

Q: Which processor wins in PassMark physics?

A: The AMD Ryzen 7 7840U wins PassMark physics with a score of 1256 versus 1073 for the 7735HS, a 17.1% lead.

Q: What are the process nodes for each processor?

A: The 7840U uses a 4 nm process, while the 7735HS uses a 6 nm process. Both are fabricated by TSMC.

Specification Differences

The two processors differ in several key specifications. The 7840U uses Zen 4 architecture with the Phoenix codename, while the 7735HS uses Zen 3+ architecture with the Rembrandt-R codename. The process node is 4 nm for the 7840U and 6 nm for the 7735HS. Base clocks are 3.30 GHz for the 7840U and 3.20 GHz for the 7735HS. Boost clocks are 5.10 GHz for the 7840U and 4.75 GHz for the 7735HS. TDP is 28W for the 7840U and 35W for the 7735HS. Socket types are FP8 for the 7840U and FP7 for the 7735HS.

Cache differences: L2 is 1 MB per core for the 7840U and 512 KB per core for the 7735HS. L1 is 64 KB per core for both, and L3 is 16 MB shared for both. Die size is 178 mm² for the 7840U and 210 mm² for the 7735HS. The 7840U has 25,000 million transistors, while the 7735HS has no recorded transistor count. Memory bandwidth is 89.6 GB/s for the 7840U and 76.8 GB/s for the 7735HS. Integrated graphics are Radeon 780M for the 7840U and Radeon 680M for the 7735HS. The 7735HS has a release date of 2023-03-31, while the 7840U has none recorded.

The Verdict

The benchmark data points to a clear use-case split. The AMD Ryzen 7 7735HS is the choice for users who prioritize sustained multi-threaded performance in synthetic 3DMark workloads and Cinebench renders. Its 35W TDP allows it to maintain higher scores in 16-thread and max-thread tests, where it leads by over 21%. It also wins Cinebench R23 multi-core, making it the better option for video rendering and CPU-heavy production tasks that scale across all 16 threads.

The AMD Ryzen 7 7840U is the better all-around processor for mixed workloads. It wins 14 of 23 head-to-head tests, including all PassMark math tests, Geekbench single-core and multi-core, and every single-thread benchmark recorded. Its 5.10 GHz boost clock and 4 nm process give it a decisive edge in per-core performance, with a 22.2% lead in Geekbench single-core. For users who run a variety of applications, including physics simulations, encryption, and floating-point math, the 7840U delivers more wins.

However, the 7735HS is not a clear loser. In 3DMark threaded tests, it shows a 21% advantage, which is the single largest margin across all benchmarks. This makes it the stronger candidate for gaming laptops or workloads that depend on that specific synthetic suite. The 7840U, by contrast, wins with smaller margins in most tests but wins more frequently. Its average benchmark score is 25432 versus 25147 for the 7735HS, and both processors sit at the 77th percentile among all CPUs.

The final recommendation: choose the AMD Ryzen 7 7735HS if your priority is Cinebench rendering and 3DMark threaded performance. Choose the AMD Ryzen 7 7840U if you need the best single-core speed, PassMark math performance, and Geekbench scores. The 7840U’s higher boost clock, larger L2 cache, and higher memory bandwidth give it a broader set of wins, and its 4 nm process suggests better efficiency despite the lower TDP. The 7735HS trades those advantages for sustained multi-core throughput, making it a specialized tool for rendering pipelines.