AMD Ryzen 5 PRO 8640U vs AMD Ryzen 7 PRO 5755GE Comparison

FAQ

Q: Which processor has the higher single-core Cinebench R23 score?

A: The AMD Ryzen 5 PRO 8640U leads with a score of 2821, which is 12.5% higher than the AMD Ryzen 7 PRO 5755GE's 2507 in the same test.

Q: Does the Ryzen 7 PRO 5755GE win any benchmark categories?

A: Yes, it wins three tests in the head-to-head comparison: data encryption, floating point math, and integer math. Specifically, it scores 16937 in data encryption versus 15843, 46589 in floating point math versus 45265, and 84004 in integer math versus 74875.

Q: How do the two processors compare in overall average benchmark score?

A: The Ryzen 5 PRO 8640U has an average benchmark score of 30254, while the Ryzen 7 PRO 5755GE scores 29656. Both sit at the 81st percentile among all CPUs in the database.

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

A: The Ryzen 5 PRO 8640U supports DDR5 memory with a bandwidth of 89.6 GB/s, while the Ryzen 7 PRO 5755GE uses DDR4 with a bandwidth of 51.2 GB/s. That is a substantial 38.4 GB/s gap in favor of the 8640U.

Q: Which processor has more cores and threads?

A: The Ryzen 7 PRO 5755GE has 8 cores and 16 threads, while the Ryzen 5 PRO 8640U has 6 cores and 12 threads. Despite fewer cores, the 8640U wins 14 of 17 head-to-head benchmarks.

Q: Are both processors currently in production?

A: Yes, both are listed as Active in production status. The Ryzen 5 PRO 8640U was released on 2024-04-15, and the Ryzen 7 PRO 5755GE followed on 2024-09-04.

Architecture Differences

The two processors represent different generations of AMD silicon. The Ryzen 5 PRO 8640U belongs to the 8000 series and uses the Zen 4 architecture with the Hawk Point codename. It is built on a 4 nm process at TSMC, with 25,000 million transistors on a 178 mm² die. The Ryzen 7 PRO 5755GE, by contrast, is a 5000 series part using Zen 3 with the Cezanne codename, manufactured on a 7 nm process with 10,700 million transistors on a 180 mm² die.

The cache layouts differ notably. Both chips share 64 KB of L1 cache per core and 16 MB of L3 cache. However, the 8640U has 1 MB of L2 cache per core, while the 5755GE has only 512 KB per core. That means with 6 cores, the 8640U has 6 MB of total L2, while the 8-core 5755GE has just 4 MB of L2, giving the smaller chip a total cache advantage in the mid-level hierarchy.

Memory support is a major architectural split. The 8640U pairs with DDR5 memory through a dual-channel bus delivering 89.6 GB/s of bandwidth, and it supports ECC memory. The 5755GE uses DDR4 on a dual-channel bus with 51.2 GB/s, and it does not support ECC. The 8640U also has more PCIe lanes: Gen 4 with 20 lanes from the CPU, compared to Gen 3 with 16 lanes on the 5755GE.

The integrated graphics differ as well. The 8640U carries a Radeon 760M, while the 5755GE has a Radeon Vega 8. The market segments also diverge: the 8640U is a mobile part using AMD Socket FP7, while the 5755GE is a desktop part on AMD Socket AM4. The 8640U has a 28 W TDP, whereas the 5755GE has a 35 W TDP despite being a desktop chip.

Clock speeds favor the 8640U. Its base clock is 3.50 GHz with a boost of 4.90 GHz, against the 5755GE's 3.20 GHz base and 4.60 GHz boost. Neither processor has an unlocked multiplier, so overclocking is not an option on either platform.

The Verdict

The data points to the Ryzen 5 PRO 8640U as the stronger overall performer, despite having fewer cores. It wins 14 of 17 head-to-head benchmarks, including every Cinebench test across R15, R20, and R23. The single-core advantage is consistent at roughly 12.5% in all Cinebench iterations, which reflects the efficiency of Zen 4 on the 4 nm node.

The Ryzen 7 PRO 5755GE is not without merit. It wins integer math by 10.9%, floating point math by 2.8%, and data encryption by 6.5%. Those wins matter for specific workloads, but they do not offset the 8640U's broad dominance. The 8640U's average benchmark score of 30254 is 2.0% higher than the 5755GE's 29656, and its nearest rivals include the Ryzen 7 2700X and Ryzen 7 7736U, while the 5755GE sits near the Ryzen 5 9600X and Ryzen AI 7 345.

For a buyer choosing between these two, the 8640U is the pick for general productivity, rendering, and single-threaded responsiveness. The 5755GE makes sense only if the specific tasks are integer-heavy or encryption-focused, or if the platform requires AM4 and DDR4 compatibility.

Specification Differences

| Specification | AMD Ryzen 5 PRO 8640U | AMD Ryzen 7 PRO 5755GE |

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

| Series | 8000 series | 5000 series |

| Cores | 6 | 8 |

| Threads | 12 | 16 |

| Base Clock | 3.50 GHz | 3.20 GHz |

| Boost Clock | 4.90 GHz | 4.60 GHz |

| TDP | 28 W | 35 W |

| Socket | AMD Socket FP7 | AMD Socket AM4 |

| Architecture | Zen 4 | Zen 3 |

| Codename | Hawk Point | Cezanne |

| Process Node | 4 nm | 7 nm |

| Transistors | 25,000 million | 10,700 million |

| Die Size | 178 mm² | 180 mm² |

| L2 Cache | 1 MB (per core) | 512 KB (per core) |

| L3 Cache | 16 MB (shared) | 16 MB |

| Memory Support | DDR5 | DDR4 |

| Memory Bandwidth | 89.6 GB/s | 51.2 GB/s |

| ECC Memory | Yes | No |

| PCIe | Gen 4, 20 Lanes (CPU only) | Gen 3, 16 Lanes (CPU only) |

| Integrated Graphics | Radeon 760M | Radeon Vega 8 |

| Market Segment | Mobile | Desktop |

| Release Date | 2024-04-15 | 2024-09-04 |

Head-to-Head Benchmarks

The Cinebench results are unanimous in favor of the Ryzen 5 PRO 8640U. In R15 multicore, the 8640U scores 2014 against 1789, a 12.6% lead. The R15 single-core test shows 284 versus 252, a 12.7% advantage. R20 multicore gives 8392 versus 7458 (12.5% higher), and R20 single-core gives 1184 versus 1052 (12.5% higher). R23 multicore delivers 19982 versus 17759, and R23 single-core delivers 2821 versus 2507, both at a 12.5% margin.

The Passmark suite reveals a more mixed picture. The 8640U wins data compression with 260925 versus 252937, a 3.2% edge. Extended instructions go to the 8640U at 19130 versus 17029, a 12.3% margin. The largest single win for the 8640U is in find prime numbers, where it scores 78 against 50, a 56% advantage. Physics simulation also favors the 8640U decisively: 1154 versus 841, a 37.2% gap. Random string sorting goes to the 8640U at 32114 versus 27373, a 17.3% lead. Multithreaded Passmark shows 22795 versus 20870, a 9.2% win, and single-thread Passmark gives 3732 versus 3353, an 11.3% margin.

The Ryzen 7 PRO 5755GE takes three tests. Data encryption is its strongest category at 16937 versus 15843, a 6.5% win. Integer math shows 84004 versus 74875, a 10.9% advantage. Floating point math is closer, with 46589 versus 45265, a 2.8% win. These three victories highlight the 5755GE's strength in raw arithmetic throughput, likely due to its extra two cores.

Where Each One Wins

The Ryzen 5 PRO 8640U dominates in rendering workloads. All three Cinebench versions show consistent 12.5% to 12.7% leads in both single-core and multicore tests. This makes it the better choice for video editing, 3D modeling, and any application that relies on Cinebench-style CPU rendering. The physics simulation result, where the 8640U leads by 37.2%, reinforces this for gaming physics and simulation tasks.

The 8640U also wins in memory-sensitive workloads. Its DDR5 support with 89.6 GB/s of bandwidth, compared to the 5755GE's 51.2 GB/s, contributes to its 17.3% win in random string sorting and 3.2% win in data compression. For users who work with large datasets or compress files regularly, the 8640U's memory subsystem matters.

The Ryzen 7 PRO 5755GE has a narrower set of advantages. Its 10.9% win in integer math suggests it handles arithmetic-heavy code well, such as financial modeling or cryptographic key generation. The 6.5% win in data encryption points to a strength in security-related tasks. Its 2.8% win in floating point math is modest but indicates some scientific workloads may run slightly better on the 8-core part.

The 5755GE also has the platform advantage of AM4. That socket supports a wide range of existing motherboards and DDR4 memory, which may be relevant for users upgrading an older system. The 8640U requires a newer FP7 platform with DDR5. The 5755GE's 35 W TDP is higher than the 8640U's 28 W, but as a desktop part it does not face the same thermal constraints as a mobile chip.

Overall, the 8640U is the better all-round processor. The 5755GE is a specialized alternative for integer and encryption workloads, plus a fit for AM4-based builds.