AMD Ryzen 5 8640U vs AMD Ryzen 7 7435HS Comparison

The AMD Ryzen 5 8640U and AMD Ryzen 7 7435HS are two mobile processors that, despite their different naming, land in nearly the same performance tier. The aggregate benchmark data shows the Ryzen 5 8640U averaging a score of 26,462, while the Ryzen 7 7435HS sits just 0.2% behind at 26,402. Both CPUs occupy the 78th percentile among all tested processors, placing them in a virtual dead heat on average. However, the individual benchmark breakdown reveals two very distinct performance profiles. The 7435HS leans heavily into multi-threaded workloads, while the 8640U shows surprising strength in specific single-threaded and niche tasks. This guide breaks down exactly where each chip excels, who should buy which, and what the underlying specifications mean in practice.

Head-to-Head Benchmarks

The most dramatic divergence appears in Cinebench R23 multi-core, where the Ryzen 7 7435HS scores 19,873 against the 8640U’s 10,433. That is a 47.5% margin in favor of the 7435HS, a massive gap driven by its two additional cores and higher 45W TDP. The same pattern holds in Cinebench R15 multi-core, with the 7435HS scoring 2,003 versus 1,663, a 17% advantage. For heavily threaded rendering tasks, this is a one-sided contest.

The single-core story is more nuanced. In Cinebench R23 single-core, the 7435HS again wins, scoring 2,805 against 1,651, a 41.1% lead. Cinebench R15 single-core follows the same trend, with the 7435HS at 282 versus 256, a 9.2% gap. This is counterintuitive given the 8640U’s higher boost clock of 4.90 GHz versus 4.50 GHz, but the benchmark data is unambiguous. However, PassMark’s single-thread test flips the result entirely: the 8640U scores 3,534 while the 7435HS manages only 3,167, giving the 8640U an 11.6% win. This suggests the two chips have different optimization points, with the 7435HS favoring certain instruction paths and the 8640U excelling in others.

The 7435HS continues its sweep across most PassMark sub-tests. Data compression goes to the 7435HS at 310,038 versus 230,080, a 25.8% margin. Data encryption shows a 24.9% lead for the 7435HS (18,648 vs 14,013). Extended instructions favor the 7435HS by 23.9% (21,690 vs 16,500). Integer math sees the 7435HS ahead by 20.2% (85,274 vs 68,051), and floating-point math follows with a 17.5% margin (48,863 vs 40,330). The multi-thread PassMark score also goes to the 7435HS at 23,393 versus 20,322, a 13.1% gain, and random string sorting is 11.8% better on the 7435HS (31,827 vs 28,066).

The 8640U claws back wins in three specific areas. Its PassMark find prime numbers score of 69 beats the 7435HS’s 54 by a substantial 27.8%. PassMark physics also goes to the 8640U (1,033 vs 991, a 4.2% margin), and the aforementioned single-thread test gives it an 11.6% victory. With 11 wins for the 7435HS versus 4 for the 8640U, the multi-core king is clear. Yet the 8640U’s single-thread and prime-number results prove its Zen 4 architecture brings real efficiency in latency-sensitive work.

The Verdict

Choose the AMD Ryzen 7 7435HS if your primary workloads are multi-core rendering, video encoding, or any task that scales with thread count. The data shows a 47.5% lead in Cinebench R23 multi-core and consistent 20-26% advantages across PassMark’s compute-heavy tests. This is the processor for sustained, parallel number-crunching, provided your chassis can handle its 45W TDP. The 7435HS also wins every single-core Cinebench test, making it a better general-purpose performer for traditional desktop-style applications.

Choose the AMD Ryzen 5 8640U if you value single-thread responsiveness in specific tasks and need a cooler, more power-efficient chip. Its 28W TDP is significantly lower, and it still wins PassMark single-thread (3,534 vs 3,167) and PassMark physics (1,033 vs 991). The 8640U’s 27.8% advantage in prime-number finding suggests it excels in certain scientific or mathematical workloads. It also includes a Radeon 760M integrated GPU, whereas the 7435HS has no integrated graphics at all, meaning the 8640U can drive a display without a discrete GPU.

For most buyers, the 7435HS is the safer pick for raw performance. The 8640U is the specialist choice for those who need its single-thread wins and integrated graphics, and who can tolerate a 47.5% deficit in multi-core rendering. The aggregate scores are nearly identical, but the distribution of performance could not be more different.

FAQ

Q: Which CPU has a higher average benchmark score?

A: The AMD Ryzen 5 8640U has a marginally higher average score of 26,462, while the AMD Ryzen 7 7435HS scores 26,402, a difference of just 0.2%.

Q: Is the Ryzen 7 7435HS better for multi-core workloads?

A: Yes, decisively. It leads in Cinebench R23 multi-core (19,873 vs 10,433, a 47.5% margin), Cinebench R15 multi-core (2,003 vs 1,663, a 17% margin), and PassMark multi-thread (23,393 vs 20,322, a 13.1% margin).

Q: Does the Ryzen 5 8640U win any benchmark tests?

A: Yes, it wins four head-to-head tests: PassMark find prime numbers (69 vs 54, a 27.8% margin), PassMark single-thread (3,534 vs 3,167, an 11.6% margin), PassMark physics (1,033 vs 991, a 4.2% margin), and the identical PassMark single-thread duplicate.

Q: Which processor has integrated graphics?

A: Only the AMD Ryzen 5 8640U includes integrated graphics, specifically a Radeon 760M. The AMD Ryzen 7 7435HS has no integrated graphics, requiring a discrete GPU for display output.

Q: What are the TDP differences between these two chips?

A: The Ryzen 5 8640U has a TDP of 28W, while the Ryzen 7 7435HS has a TDP of 45W. This makes the 8640U a more power-efficient option for thin-and-light laptops.

Q: How do these processors compare to their nearest rivals?

A: The Ryzen 5 8640U is within 0.3% of the Intel Core i9-12900HK and Intel Core i7-1280P, while the Ryzen 7 7435HS is within 0.3% of the AMD Ryzen 5 7600 and the same Intel chips. Both sit in a tight performance cluster.

Specification Differences

The two processors differ in nearly every fundamental specification. The Ryzen 5 8640U offers 6 cores and 12 threads, while the Ryzen 7 7435HS provides 8 cores and 16 threads. Base clocks favor the 8640U at 3.50 GHz versus 3.10 GHz, and boost clocks also favor the 8640U at 4.90 GHz versus 4.50 GHz. The TDP gap is significant: 28W for the 8640U versus 45W for the 7435HS. The 8640U uses the AMD Socket FP8, while the 7435HS uses AMD Socket FP7. Memory bandwidth differs, with the 8640U supporting 89.6 GB/s and the 7435HS supporting 76.8 GB/s. The 8640U supports non-ECC memory, while the 7435HS supports ECC memory. The 8640U includes a Radeon 760M integrated GPU; the 7435HS has none. The 8640U’s part number spans multiple packages (100-000001324 FP7r2, 100-000001376 FP7, 100-000001313 FP8), while the 7435HS has a single part number (100-000001506). Both are locked (multiplier not unlocked) and support DDR5 dual-channel memory with Gen 4 PCIe at 20 lanes.

Architecture Differences

The architecture gap explains the benchmark results. The Ryzen 5 8640U is built on Zen 4 architecture with the codename Hawk Point, part of AMD’s 8000 series. It uses a 4 nm process node from TSMC, with 25,000 million transistors on a 178 mm² die. Its cache layout includes 64 KB of L1 per core, 1 MB of L2 per core, and 16 MB of shared L3. The Ryzen 7 7435HS, by contrast, is a Zen 3+ design with the codename Rembrandt-R, part of the 7000 series. It uses a larger 6 nm process node and a 210 mm² die size. Its cache is also 64 KB L1 per core, but L2 is reduced to 512 KB per core, with the same 16 MB shared L3. The 7435HS has no listed transistor count, and its release date is not provided, while the 8640U was released on December 5, 2023. The 8640U’s smaller process node and larger L2 cache per core contribute to its single-thread wins, while the 7435HS’s older architecture is compensated by two extra cores and a higher TDP envelope.

Where Each One Wins

The Ryzen 7 7435HS is the clear winner for multi-threaded rendering, video editing, 3D modeling, and any workload that saturates all cores. Its Cinebench R23 multi-core score of 19,873 is nearly double the 8640U’s, and it dominates PassMark integer math, floating-point math, data compression, and encryption. If your workflow involves compiling code, batch image processing, or running virtual machines, the 7435HS’s extra cores and threads will deliver tangible gains. The 45W TDP also suggests it can sustain higher clocks under load, which is typical for a performance-oriented laptop.

The Ryzen 5 8640U wins in scenarios that reward single-thread efficiency and specific instruction sets. Its PassMark single-thread score of 3,534 is 11.6% higher, and its 27.8% lead in prime-number finding points to advantages in mathematical or scientific computing tasks. The PassMark physics win (1,033 vs 991) also suggests better performance in physics simulations or certain game engines that rely on single-thread physics. The presence of a Radeon 760M integrated GPU makes the 8640U the only choice here for systems without a discrete graphics card. Its 28W TDP and 89.6 GB/s memory bandwidth also make it a better fit for thin-and-light laptops where thermals and power draw are critical constraints. For general office work, web browsing, and light content creation, the 8640U’s efficiency and single-thread strength make it the more practical daily driver.