AMD Ryzen 5 7545U vs AMD Ryzen 5 8640U Comparison

FAQ

Q: Which processor has the higher overall average benchmark score?

A: The AMD Ryzen 5 7545U records an average benchmark score of 26849, which places it at the 79th percentile among all CPUs. The AMD Ryzen 5 8640U trails slightly with an average score of 26462, sitting at the 78th percentile.

Q: How do these two chips compare in multi-threaded workloads?

A: The 7545U leads decisively in multi-core rendering tests. In Cinebench R23 multi-core, the 7545U scores 17253 against the 8640U's 10433, a 65.4% advantage. The Cinebench R15 multi-core result also favors the 7545U at 1739 versus 1663, a 4.6% lead.

Q: Are there any workloads where the 8640U pulls ahead?

A: Yes, the 8640U wins in math-heavy PassMark tests. It scores 68051 in integer math versus 60206 for the 7545U, an 11.5% advantage. In floating point math, the 8640U records 40330 against 36754, an 8.9% edge. It also wins PassMark multi-thread by a narrow 0.1% margin.

Q: What is the difference in single-core performance?

A: The results are mixed. In Cinebench R15 single-core, the 8640U leads with 256 versus 245, a 4.3% advantage. However, in Cinebench R23 single-core, the 7545U dominates with 2435 versus 1651, a 47.5% lead. PassMark single-thread also favors the 7545U at 3673 versus 3534, a 3.9% margin.

Q: Do these processors use the same manufacturing process?

A: Both are built on TSMC's 4 nm process node, but the die sizes and transistor counts differ. The 7545U uses a 137 mm² die with 20,900 million transistors, while the 8640U uses a larger 178 mm² die with 25,000 million transistors.

Q: Which chip has a better position relative to its nearest rivals?

A: The 7545U sits within 0.4% of its closest competitors, including the Intel Core i7-1370P and AMD Ryzen 5 5500GT. The 8640U matches the Intel Core i9-12900HK and Intel Core i7-1280P exactly at 0% delta, with other rivals within 0.3%.

Architecture Differences

Both processors are built on the Zen 4 architecture, but they come from different families. The 7545U belongs to the 7000 series with the codename Phoenix2, while the 8640U is part of the 8000 series using the Hawk Point codename. Both use a 4 nm process from TSMC, which keeps power characteristics similar, but the physical implementation differs substantially.

The 7545U packs 20,900 million transistors onto a 137 mm² die. The 8640U increases that to 25,000 million transistors on a 178 mm² die. That larger die and higher transistor count suggest the 8640U integrates more logic, likely in its graphics and I/O blocks, even though the CPU core configuration remains identical at 6 cores and 12 threads.

Cache hierarchies are the same on paper: 64 KB L1 per core, 1 MB L2 per core, and 16 MB shared L3. Memory support is also identical with dual-channel DDR5 and 89.6 GB/s bandwidth. The key architectural difference beyond die size is the integrated graphics. The 7545U comes with the Radeon 740M, while the 8640U steps up to the Radeon 760M. That GPU upgrade is a meaningful differentiator for users who rely heavily on integrated graphics.

PCIe connectivity differs as well. The 7545U provides Gen 4 with 14 lanes from the CPU, while the 8640U offers Gen 4 with 20 lanes. That gives the 8640U more headroom for NVMe storage or external GPU enclosures. ECC memory support is exclusive to the 7545U, which matters for users running memory-error-sensitive workloads. The 8640U does not support ECC.

Sockets also differ. The 7545U uses AMD Socket FP7, while the 8640U uses AMD Socket FP8. That means they are not drop-in interchangeable in a given laptop chassis. The 8640U also has multiple part numbers covering FP7r2 and FP7 in addition to FP8, suggesting broader platform compatibility.

Head-to-Head Benchmarks

The benchmark data reveals a split personality between these two chips. The 7545U wins 10 of the 15 head-to-head comparisons, while the 8640U takes 5. But the margins tell a more nuanced story.

The biggest win for the 7545U comes in Cinebench R23 multi-core, where it scores 17253 against 10433, a massive 65.4% advantage. That is not a small gap; it is a generational leap in rendering performance. The single-core result in Cinebench R23 is similarly lopsided: 2435 versus 1651, a 47.5% lead for the 7545U. These two results alone suggest the 7545U has substantially better sustained boost behavior under this workload.

Cinebench R15 shows a closer contest. The 7545U wins multi-core with 1739 versus 1663, a 4.6% margin, but the 8640U takes single-core with 256 versus 245, a 4.3% edge. That inversion between R15 and R23 single-core is unusual and points to different thermal or power management profiles during shorter versus longer test runs.

In PassMark tests, the 7545U wins data compression by 3.6% (238345 versus 230080), data encryption by 1.3% (14202 versus 14013), extended instructions by 8.3% (17865 versus 16500), random string sorting by 8.2% (30358 versus 28066), and physics by 2.3% (1057 versus 1033). It also wins single-thread by 3.9% (3673 versus 3534).

The 8640U counters in math workloads. It wins integer math by 11.5% (68051 versus 60206) and floating point math by 8.9% (40330 versus 36754). It also wins find prime numbers by 1.4% (69 versus 68) and PassMark multi-thread by a razor-thin 0.1% (20322 versus 20298).

The pattern is clear: the 7545U dominates in rendering, compression, encryption, and sorting tasks, while the 8640U excels in raw arithmetic throughput. For general productivity, the 7545U's wider lead in more test categories gives it the overall edge in the database's average benchmark score.

The Verdict

The data points to the AMD Ryzen 5 7545U as the stronger all-around performer. It holds a higher average benchmark score (26849 versus 26462), a higher percentile ranking (79 versus 78), and wins the majority of head-to-head tests (10 versus 5). The Cinebench R23 multi-core result is the standout difference: a 65.4% advantage that dwarfs any single win for the 8640U.

That said, the 8640U is not a weak chip. Its wins in integer and floating point math show it handles arithmetic-heavy tasks better, and its PassMark multi-thread score is essentially a tie. The 8640U also brings a superior integrated GPU (Radeon 760M versus Radeon 740M) and more PCIe lanes, which are important for certain laptop configurations.

Users who prioritize rendering, compression, encryption, and general responsiveness should choose the 7545U. Users who need better integrated graphics performance or more PCIe connectivity, and who can tolerate slightly lower CPU benchmark scores, should look at the 8640U.

Specification Differences

| Specification | AMD Ryzen 5 7545U | AMD Ryzen 5 8640U |

|---|---|---|

| Series | 7000 series | 8000 series |

| Base Clock | 3.20 GHz | 3.50 GHz |

| Boost Clock | 4.90 GHz | 4.90 GHz |

| TDP | 28 W | 28 W |

| Socket | AMD Socket FP7 | AMD Socket FP8 |

| Codename | Phoenix2 | Hawk Point |

| Transistors | 20,900 million | 25,000 million |

| Die Size | 137 mm² | 178 mm² |

| ECC Memory | Yes | No |

| PCIe | Gen 4, 14 Lanes (CPU only) | Gen 4, 20 Lanes (CPU only) |

| Integrated Graphics | Radeon 740M | Radeon 760M |

| Release Date | 2023-11-01 | 2023-12-05 |

Where Each One Wins

The 7545U is the pick for multi-core rendering workloads. Its Cinebench R23 multi-core score of 17253 is 65.4% ahead of the 8640U, which makes it the clear choice for video encoding, 3D rendering, and other heavily threaded creative tasks. It also wins in data compression (3.6% ahead), data encryption (1.3% ahead), extended instructions (8.3% ahead), and random string sorting (8.2% ahead), making it stronger for database work, file archiving, and scientific computing.

The 7545U also takes the physics simulation test by 2.3% and the single-thread PassMark by 3.9%. Its Cinebench R23 single-core lead of 47.5% is remarkable, indicating it handles bursty single-threaded workloads with more headroom. For users who run a mix of office applications, web browsing, and content creation, the 7545U offers the broader performance envelope.

The 8640U wins where raw arithmetic matters. Its integer math score of 68051 is 11.5% higher, and its floating point score of 40330 is 8.9% higher. That makes it better suited for financial modeling, engineering simulations, and any workload dominated by number crunching. It also edges out the 7545U in find prime numbers by 1.4% and matches it in PassMark multi-thread within 0.1%.

The 8640U also has the hardware advantages outside the CPU benchmarks. Its Radeon 760M integrated graphics is a step above the Radeon 740M, which matters for light gaming and GPU-accelerated applications in thin-and-light laptops. The extra PCIe lanes (20 versus 14) give it more flexibility for storage and expansion. For users who value those platform features over raw CPU scores, the 8640U remains a solid choice, but the benchmark data consistently favors the 7545U for processing performance.