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

The Verdict

The benchmark data in this database splits this comparison into a simple verdict: the AMD Ryzen 7 7 7745HX is the dominant part, winning 15 of 17 head-to-head entries. The Ryzen 5 7645HX is not without its own merits, taking 2 wins, but the overall average benchmark score favors the 7 7745HX. The measured average benchmark score for the 7 7745HX is 33091, against 33668 for the 5 7645HX. That average is misleading on its face, as the 5 7645HX edges ahead by 1.7% in aggregate, but the head-to-head table shows a different story: the 7 7745HX wins nearly every test where both were measured directly.

For a user choosing between these two mobile processors, the data points to the 7 7745HX for almost any workload that scales with cores or threads. The 5 7645HX is the pick only for a narrow set of single-threaded or specialized tasks. The 7 7745HX leads in Cinebench R23 multi-core by 24.2%, in PassMark integer math by 26.8%, and in floating point math by 24.1%. Those are not marginal differences. They represent a meaningful performance tier gap.

The 5 7645HX wins in Geekbench single-core by 12.3% and in PassMark find prime numbers by 14.1%. Those are the only two victories. If a workload is specifically single-threaded in the way Geekbench measures it, the 5 7645HX is the better part. For everything else in the recorded data, the 7 7745HX is faster.

The 7 7745HX also has an unlocked multiplier, while the 5 7645HX does not. That is a feature difference that matters for users who intend to overclock. The 5 7645HX has a higher base clock of 4.00 GHz versus 3.60 GHz, but the 7 7745HX has a higher boost clock of 5.10 GHz versus 5.00 GHz. The 7 7745HX also carries a higher TDP of 55 W versus 45 W. The data indicates the 7 7745HX is the performance pick, and the 5 7645HX is the efficiency-leaning pick with a single-core advantage in one benchmark suite.

Where Each One Wins

The 7 7745HX wins in every multi-threaded benchmark recorded in the head-to-head table. That includes Cinebench R15 and R23 multi-core, Geekbench multi-core, PassMark multithread, data compression, data encryption, extended instructions, floating point math, integer math, physics, and random string sorting. The margins range from 11.8% in PassMark physics to 26.8% in PassMark integer math. The 7 7745HX also wins in single-threaded Cinebench R15 and R23, and in PassMark single-thread, but by much smaller margins: 1.9%, 2.2%, and 1% respectively.

The 5 7645HX wins in Geekbench single-core by 12.3% and in PassMark find prime numbers by 14.1%. The Geekbench single-core result is notable because it is a head-to-head reversal of the Cinebench single-core results. The 5 7645HX scores 2657 in Geekbench single-core, while the 7 7745HX scores 2366. In Cinebench R23 single-core, the 7 7745HX scores 1850 versus 1809 for the 5 7645HX. The two parts trade blows in single-threaded tests depending on the benchmark.

For use-case splitting, the data says this: the 7 7745HX is for rendering, compilation, data processing, encryption, and any workload that uses more than a few threads. The 5 7645HX is for a specific set of single-threaded tasks where Geekbench-style performance matters more than Cinebench-style performance, and for prime number finding. The PassMark find prime numbers test is a specialized workload, but the 14.1% win for the 5 7645HX is real and consistent.

The 7 7745HX also outperforms in PassMark data encryption by 22.1% and data compression by 21.1%. Those are substantial wins for file handling and security-related workloads. The 7 7745HX leads in PassMark extended instructions by 20.7%, which covers SIMD and other instruction set extensions. The 5 7645HX has no wins in any of those categories.

Architecture Differences

Both processors are built on the same Zen 4 architecture and share the Dragon Range codename. Both use the 5 nm process node from TSMC, and both have the same transistor count of 6,570 million and the same die size of 71 mm². The 5 7645HX has 6 cores and 12 threads, while the 7 7745HX has 8 cores and 16 threads. That two-core and four-thread difference is the primary architectural driver behind the multi-threaded performance gap.

The cache hierarchy is identical in structure: 64 KB of L1 per core, 1 MB of L2 per core, and 32 MB of shared L3. Because the 7 7745HX has more cores, it has more total L1 and L2 cache, but the per-core amounts are the same. Both support DDR5 memory with a dual-channel bus and a memory bandwidth of 83.2 GB/s. Both support ECC memory. Both have the same PCIe configuration: Gen 5 with 28 lanes (CPU only). Both have the same integrated graphics, the Radeon 610M.

The base clock differs: the 5 7645HX runs at 4.00 GHz, the 7 7745HX at 3.60 GHz. The boost clock differs in the opposite direction: the 5 7645HX boosts to 5.00 GHz, the 7 7745HX to 5.10 GHz. The TDP also differs: 45 W for the 5 7645HX, 55 W for the 7 7745HX. The 7 7745HX has an unlocked multiplier, the 5 7645HX does not. Both use the AMD Socket FL1, both are in the 7000 series, and both were released on the same date.

The architectural picture is clear: same silicon generation, same process, same per-core cache layout, but the 7 7745HX is a larger chip with two additional cores and a higher TDP budget. The 5 7645HX compensates with a higher base clock, which explains its single-core win in Geekbench. The 7 7745HX has a slightly higher boost clock and more cores, which explains its dominance in multi-threaded tests.

FAQ

Q: Which processor is faster in multi-threaded workloads?

A: The AMD Ryzen 7 7745HX is faster in every multi-threaded benchmark recorded. It leads by 24.2% in Cinebench R23 multi-core, 23.8% in Cinebench R15 multi-core, 14.9% in Geekbench multi-core, and 18.7% in PassMark multithread.

Q: Does the Ryzen 5 7645HX win any benchmarks?

A: Yes, the Ryzen 5 7645HX wins two head-to-head tests: Geekbench single-core by 12.3% and PassMark find prime numbers by 14.1%.

Q: What is the core and thread difference between the two?

A: The Ryzen 5 7645HX has 6 cores and 12 threads. The Ryzen 7 7745HX has 8 cores and 16 threads. Both share the same Zen 4 architecture and the same 32 MB of shared L3 cache.

Q: Are the single-threaded results consistent across benchmarks?

A: No, they are not. The Ryzen 7 7745HX wins in Cinebench R15 single-core by 1.9% and Cinebench R23 single-core by 2.2%, as well as PassMark single-thread by 1%. The Ryzen 5 7645HX wins in Geekbench single-core by 12.3%. The results depend on the benchmark methodology.

Q: Is the Ryzen 7 7745HX more power-hungry?

A: The recorded TDP for the Ryzen 7 7745HX is 55 W, while the Ryzen 5 7645HX has a TDP of 45 W. The Ryzen 7 7745HX also has a higher boost clock of 5.10 GHz versus 5.00 GHz.

Q: Do both processors have the same integrated graphics?

A: Yes, both use the Radeon 610M integrated graphics. They also share the same memory bandwidth of 83.2 GB/s, the same dual-channel DDR5 support, and the same PCIe Gen 5 configuration with 28 lanes.

Head-to-Head Benchmarks

The largest win for the Ryzen 7 7745HX comes in PassMark integer math, where it scores 105773 against 77432 for the Ryzen 5 7645HX, a delta of 26.8%. That is the single biggest percentage gap in the entire head-to-head table. The next largest is Cinebench R23 multi-core, where the 7 7745HX scores 18452.5 against 13985, a 24.2% advantage. Cinebench R15 multi-core shows a 23.8% lead with scores of 2986 versus 2276. PassMark floating point math is close behind: 64297 versus 48798, a 24.1% delta.

PassMark random string sorting favors the 7 7745HX by 22.6%, with scores of 44474 versus 34434. PassMark data encryption shows a 22.1% lead for the 7 7745HX (22967 versus 17900), and PassMark data compression shows a 21.1% lead (383322 versus 302256). PassMark extended instructions rounds out the 20% plus wins with a 20.7% delta (28966 versus 22969). PassMark multithread gives the 7 7745HX an 18.7% win (32581 versus 26476). Geekbench multi-core shows a 14.9% lead for the 7 7745HX (13613 versus 11586). PassMark physics is an 11.8% win for the 7 7745HX (1697 versus 1497).

The single-threaded wins for the 7 7745HX are much smaller. PassMark single-thread and PassMark singlethread both show the same scores: 3947 versus 3907, a 1% delta. Cinebench R23 single-core gives the 7 7745HX a 2.2% win (1850 versus 1809), and Cinebench R15 single-core gives it a 1.9% win (294.5 versus 289).

The two wins for the Ryzen 5 7645HX are both substantial. Geekbench single-core shows the 5 7645HX at 2657 versus 2366 for the 7 7745HX, a 12.3% delta. PassMark find prime numbers shows the 5 7645HX at 178 versus 156, a 14.1% delta. These are the only tests where the 5 7645HX comes out ahead, and they are both single-threaded or specialized integer workloads.

The overall pattern is unambiguous. In 15 of 17 head-to-head tests, the 7 7745HX is faster. The margins for the 7 7745HX in multi-threaded tests are often two to three times larger than the margins for the 5 7645HX in its two wins. The data supports a verdict that the 7 7745HX is the stronger processor for the vast majority of tasks.

Specification Differences

The two processors differ in several recorded specifications. The core count is 6 for the Ryzen 5 7645HX and 8 for the Ryzen 7 7745HX. The thread count is 12 versus 16. The base clock is 4.00 GHz for the 5 7645HX and 3.60 GHz for the 7 7745HX. The boost clock is 5.00 GHz for the 5 7645HX and 5.10 GHz for the 7 7745HX. The TDP is 45 W for the 5 7645HX and 55 W for the 7 7745HX. The multiplier unlocked status differs: the 5 7645HX is locked, the 7 7745HX is unlocked.

The part numbers differ: 100-000000872 for the 5 7645HX and 100-000000721 for the 7 7745HX. The generation labels differ: Ryzen 5 (Zen 4 (Dragon Range)) versus Ryzen 7 (Zen 4 (Dragon Range)).

All other specifications are identical. Both use the AMD Socket FL1, Zen 4 architecture, Dragon Range codename, 5 nm process node from TSMC, 6,570 million transistors, and a 71 mm² die size. Both have 64 KB of L1 per core, 1 MB of L2 per core, and 32 MB of shared L3. Both support DDR5 memory with a dual-channel bus, 83.2 GB/s memory bandwidth, and ECC memory. Both have PCIe Gen 5 with 28 lanes (CPU only) and the Radeon 610M integrated graphics. Both are in the 7000 series, target the mobile market segment, are in active production, and were released on the same date. Neither has a recorded launch MSRP in the database.