AMD Ryzen 5 PRO 7645 vs AMD Ryzen 7 7745HX Comparison

Head-to-Head Benchmarks

The most striking result in the database is the Cinebench R23 single-core gap. The Ryzen 5 PRO 7645 scores 3065 against 1850 for the Ryzen 7 7745HX, a 39.6% advantage. That is a massive single-thread lead, and it shows up again in Cinebench R15 single-core, where the PRO chip wins 308 to 294.5, a 4.4% margin. If your workload is dominated by lightly threaded tasks, the Ryzen 5 PRO 7645 is clearly the stronger part.

Multi-core is a split decision. In Cinebench R15 multicore, the Ryzen 7 7745HX wins 2986 to 2188, a 36.5% lead. But in Cinebench R23 multicore, the tables turn: the Ryzen 5 PRO 7645 scores 21710 versus 18452.5, a 15% win for the six-core part. This is unusual, and it suggests the R23 test favors the PRO chip’s higher sustained clocks or memory behavior, while R15 favors the 8-core 7745HX’s raw thread count. Do not assume one chip dominates all multi-threaded work; the specific test matters.

The Passmark suite heavily favors the Ryzen 7 7745HX. In floating-point math, it leads 64297 to 45202, a 42.2% margin. Integer math is nearly as lopsided: 105773 versus 74782, a 41.4% lead. Data compression goes 383322 to 286298, a 33.9% win. Data encryption shows a 37.9% edge (22967 to 16657). Extended instructions favor the 7745HX by 32.8% (28966 to 21813). Random string sorting is a 28.7% win (44474 to 34557). The multithread Passmark score is 32581 versus 25489, a 27.8% advantage. Even the single-thread Passmark test, which usually favors the PRO chip, goes to the 7745HX: 3947 to 3652, an 8.1% margin.

The Ryzen 5 PRO 7645 wins only one other Passmark test: find prime numbers, 198 to 156, a 21.2% lead. Physics goes to the 7745HX by a modest 6.2% (1697 to 1598). Overall, the 7745HX wins 11 of the 15 head-to-head comparisons, while the PRO 7645 wins 4. But the two Cinebench single-core wins for the PRO chip are decisive, and the R23 multicore result is a notable outlier.

Where Each One Wins

Choose the Ryzen 7 7745HX for almost any compute-heavy, multi-threaded workload. The Passmark data is unambiguous: integer math, floating-point math, compression, encryption, and extended instructions all favor the 8-core part by margins from 27.8% to 42.2%. If you are compiling code, rendering with CPU-based engines, running data analytics, or doing any sort of parallel number crunching, the 7745HX is the pick. The multithread score of 32581 versus 25489 confirms that general multithread performance is substantially higher.

The Ryzen 5 PRO 7645 is the pick for single-threaded responsiveness and for workloads that scale poorly across cores. The Cinebench R23 single-core score of 3065 is exceptional, and the 39.6% lead over the 7745HX suggests that lightly threaded applications, such as older games, scripting, or certain CAD tools, will feel snappier. The find prime numbers result (198 versus 156) also points to a raw single-core speed advantage in a specific mathematical workload. If your primary use case is interactive desktop work with occasional bursty single-thread loads, the PRO chip has a real edge.

The R23 multicore result complicates the picture. The PRO 7645 wins that test by 15%, meaning that for at least one popular multi-threaded benchmark, the 6-core part outperforms the 8-core part. This could indicate better sustained boost behavior under load, or a thermal/power profile that allows higher clocks. Do not ignore this result if you rely on Cinebench R23 as a proxy for rendering or video encoding performance; the database shows a genuine reversal there.

Architecture Differences

Both chips use the Zen 4 architecture on TSMC’s 5 nm process, and both have 6,570 million transistors on a 71 mm² die. They share the same per-core cache layout: 64 KB L1 per core, 1 MB L2 per core, and 32 MB shared L3. Memory support is identical: DDR5, dual-channel, with 83.2 GB/s bandwidth and ECC enabled. The integrated graphics differ in branding, with the 7745HX featuring Radeon 610M while the PRO 7645 lists simply “Radeon Graphics.” Neither has 3D V-Cache.

The core counts and codenames are the main architectural split. The 7745HX is an 8-core, 16-thread part from the Dragon Range family, designed for high-performance mobile systems. It uses AMD Socket FL1 and has a 55 W TDP. The PRO 7645 is a 6-core, 12-thread Raphael part, aimed at the server/workstation segment, using AMD Socket AM5 and a 65 W TDP. The base clocks differ: 3.60 GHz for the 7745HX versus 3.80 GHz for the PRO 7645, though both boost to 5.10 GHz. The PRO chip’s higher base clock likely explains part of its single-core advantage.

PCIe connectivity also differs. The 7745HX offers Gen 5 with 28 lanes (CPU only), while the PRO 7645 offers Gen 5 with 24 lanes. That extra lane headroom on the mobile part is notable for users who plan to drive multiple high-bandwidth devices. The 7745HX has an unlocked multiplier, while the PRO 7645 is locked. The release dates are distinct as well, with the 7745HX launching in January 2023 and the PRO 7645 in June 2023.

FAQ

Q: Which CPU has better single-core performance?

A: The Ryzen 5 PRO 7645 wins Cinebench R23 single-core by 39.6% (3065 versus 1850) and Cinebench R15 single-core by 4.4% (308 versus 294.5). Passmark single-thread, however, goes to the 7745HX by 8.1% (3947 versus 3652), so the PRO chip’s lead is not universal.

Q: Which CPU is faster in multi-core workloads?

A: It depends on the benchmark. The 7745HX wins Cinebench R15 multicore by 36.5% (2986 versus 2188) and Passmark multithread by 27.8% (32581 versus 25489). The PRO 7645 wins Cinebench R23 multicore by 15% (21710 versus 18452.5). For most Passmark-derived tests, the 7745HX leads.

Q: Can the Ryzen 5 PRO 7645 be overclocked?

A: No. The multiplier is locked. The Ryzen 7 7745HX has an unlocked multiplier, allowing manual overclocking if the platform supports it.

Q: Do both CPUs support ECC memory?

A: Yes, both list ECC memory support. They also share the same memory bandwidth figure of 83.2 GB/s and dual-channel DDR5 support.

Q: Are these chips on the same manufacturing process?

A: Yes, both use TSMC’s 5 nm process, with identical transistor counts (6,570 million) and die size (71 mm²). The architecture is Zen 4 for both, but the codenames differ: Dragon Range for the 7745HX and Raphael for the PRO 7645.

Q: Which CPU has more PCIe lanes?

A: The Ryzen 7 7745HX provides 28 Gen 5 lanes (CPU only), while the Ryzen 5 PRO 7645 provides 24 Gen 5 lanes. That is a difference of 4 lanes, which may matter for multi-device setups.

The Verdict

If you need raw multi-threaded compute across a broad range of tasks, the Ryzen 7 7745HX is the clear choice. The database shows double-digit wins in integer math (41.4%), floating-point math (42.2%), compression (33.9%), encryption (37.9%), and extended instructions (32.8%). Its 11 wins out of 15 head-to-head comparisons, plus the 27.8% multithread Passmark lead, make it the workhorse for parallel workloads. The unlocked multiplier is a bonus for enthusiasts, and the 4 extra PCIe lanes give it more expansion headroom.

The Ryzen 5 PRO 7645 is the pick for single-core-centric applications. The 39.6% lead in Cinebench R23 single-core is enormous, and the higher base clock (3.80 GHz versus 3.60 GHz) likely contributes to that. Its R23 multicore win by 15% is an outlier that cannot be ignored, particularly if your rendering or encoding pipeline uses that benchmark as a proxy. The locked multiplier is a drawback for overclockers, but the PRO chip’s higher default clocks may compensate in stock configurations.

For a general-purpose laptop or compact workstation where you do a mix of threading and light single-thread tasks, the 7745HX offers more consistent wins across the Passmark suite. For a desktop workstation with a focus on single-thread responsiveness and some multi-threaded work, the PRO 7645’s R23 results and single-core dominance make it a compelling alternative. The data does not support a universal winner; it supports a workload-based split.

Specification Differences

| Specification | AMD Ryzen 7 7745HX | AMD Ryzen 5 PRO 7645 |

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

| Cores | 8 | 6 |

| Threads | 16 | 12 |

| Base Clock | 3.60 GHz | 3.80 GHz |

| Boost Clock | 5.10 GHz | 5.10 GHz |

| TDP | 55 W | 65 W |

| Socket | AMD Socket FL1 | AMD Socket AM5 |

| Codename | Dragon Range | Raphael |

| PCIe | Gen 5, 28 Lanes (CPU only) | Gen 5, 24 Lanes (CPU only) |

| Integrated Graphics | Radeon 610M | Radeon Graphics |

| Market Segment | Mobile | Server/Workstation |

| Multiplier Unlocked | Yes | No |

| Release Date | 2023-01-03 | 2023-06-12 |

| Part Number | 100-000000721 | 100-000000600 |