AMD Ryzen 5 PRO 8645HS vs Intel Arc G3 EXTREME Comparison

Head-to-Head Benchmarks

The benchmark data splits sharply between the two processors. The Intel Arc G3 EXTREME takes 13 of the 17 recorded comparisons, but the AMD Ryzen 5 PRO 8645HS claims the two most dramatic victories. In Cinebench R23 multi-core, the AMD part scores 19742 against 14655 for Intel, a 34.7% advantage. The single-core R23 result is even more lopsided: AMD posts 2787 versus 1862, a 49.7% lead. These are not marginal differences; the Ryzen 5 PRO 8645HS essentially doubles the per-core performance gap in the newest Cinebench iteration.

The Intel side responds with dominant wins in older Cinebench releases. In Cinebench R20 multi-core, Intel leads 10945 to 8291, a 24.2% margin. The R20 single-core test shows Intel ahead by 24.3% with 1545 against 1170. Cinebench R15 multi-core favors Intel by 9.3% (2192 vs 1989), while AMD edges ahead in R15 single-core by 4.9% (280 vs 267). The pattern suggests the two processors scale very differently across benchmark versions, with AMD pulling far ahead in the R23 workload while Intel dominates the R20 and R15 suites.

PassMark results mostly favor Intel. The largest Intel win comes in floating-point math, where the Arc G3 EXTREME scores 86929 against 45481, a 47.7% gap. Prime number finding shows Intel at 248 versus AMD's 73, a 70.6% delta, the single biggest proportional difference in the entire comparison. Physics calculations favor Intel by 52% (2515 vs 1208). Data encryption goes to Intel by 27.2% (23881 vs 17387), and data compression by 13.4% (307094 vs 265826). Extended instruction throughput favors Intel by 11.7% (24017 vs 21212), and the multi-thread PassMark score goes to Intel by 23.1% (30659 vs 23569).

AMD's remaining wins are narrow. Integer math shows AMD at 72740 versus 71164, a 2.2% edge. The single-thread PassMark scores are identical across both listed variants, with Intel ahead 4293 to 3858, a 10.1% margin. Random string sorting favors Intel by 5% (37331 vs 35472). The overall average benchmark score confirms the Intel part's lead: 36699 for the Arc G3 EXTREME against 30879 for the Ryzen 5 PRO 8645HS.

Where Each One Wins

The data points to distinct use-case strengths. The AMD Ryzen 5 PRO 8645HS delivers its best results in Cinebench R23, particularly in single-core workloads. A 49.7% lead in R23 single-core suggests strong per-thread performance for lightly threaded applications that rely on modern instruction sets. The 34.7% R23 multi-core advantage indicates the AMD part handles current-generation rendering or encoding tasks well, even with fewer cores.

The Intel Arc G3 EXTREME shows a broader spread of wins. Its 70.6% advantage in prime number finding points to strong integer-heavy algorithmic workloads. The 52% physics lead and 47.7% floating-point advantage suggest the Intel part excels in simulation and scientific computing tasks. The 27.2% encryption lead positions it well for security-related workloads, while the 23.1% multi-thread PassMark score indicates robust general parallel performance.

The compression and random string sorting results favor Intel by 13.4% and 5% respectively, which matters for database work or file archival. The extended instructions score favors Intel by 11.7%, useful for vectorized code. AMD's integer math win at 2.2% is small but consistent, and the R15 single-core win at 4.9% shows the AMD part retains an edge in legacy single-threaded tests.

Architecture Differences

The two processors come from fundamentally different design families. The AMD Ryzen 5 PRO 8645HS uses the Zen 4 architecture on a 4 nm TSMC process, codenamed Hawk Point, part of the 8000 series. It packs 6 cores and 12 threads with a base clock of 4.30 GHz and a boost clock of 5.00 GHz. The Intel Arc G3 EXTREME uses the Panther Lake codename on a 3 nm Intel process, with 14 cores and 14 threads, base clock of 1.90 GHz and boost clock of 4.70 GHz. Intel's process node advantage (3 nm vs 4 nm) does not translate into a clock speed advantage; the AMD part runs faster at both base and boost.

The core count difference is substantial: Intel offers 14 cores versus AMD's 6, but AMD uses simultaneous multithreading to reach 12 threads, while Intel's 14 threads equal its core count, suggesting no hyperthreading on the Intel part. Cache layouts differ as well. AMD provides 64 KB of L1 per core, 1 MB of L2 per core, and 16 MB of shared L3. Intel provides 192 KB of L1 per core, 2.5 MB of L2 per core, and 18 MB of shared L3. Total L3 is similar, but Intel's larger per-core L1 and L2 caches likely help its PassMark wins.

Memory support splits by vendor. AMD uses DDR5 with dual-channel access and 89.6 GB/s bandwidth, plus ECC memory support. Intel uses LPDDR5X with dual-channel access and 136.5 GB/s bandwidth, but no ECC support. The higher memory bandwidth for Intel correlates with its strong data compression and encryption results. PCIe generations differ: AMD provides Gen 4 with 20 lanes, while Intel provides Gen 5 with only 4 lanes. The integrated graphics differ: AMD uses the Radeon 760M, Intel uses the Arc B390. Both target the mobile market segment and are listed as active production.

FAQ

Q: Which processor has the higher boost clock?

A: The AMD Ryzen 5 PRO 8645HS boosts to 5.00 GHz, while the Intel Arc G3 EXTREME boosts to 4.70 GHz.

Q: Does the Intel Arc G3 EXTREME support ECC memory?

A: No. The Intel part does not support ECC memory, while the AMD Ryzen 5 PRO 8645HS does support ECC.

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

A: The Intel Arc G3 EXTREME offers 136.5 GB/s with LPDDR5X, while the AMD Ryzen 5 PRO 8645HS offers 89.6 GB/s with DDR5, a 46.9 GB/s gap in favor of Intel.

Q: Which processor has more cores and threads?

A: The Intel Arc G3 EXTREME has 14 cores and 14 threads. The AMD Ryzen 5 PRO 8645HS has 6 cores and 12 threads.

Q: How do the average benchmark scores compare?

A: The Intel Arc G3 EXTREME has an average benchmark score of 36699, compared to 30879 for the AMD Ryzen 5 PRO 8645HS.

Q: What process nodes do the two processors use?

A: The AMD Ryzen 5 PRO 8645HS uses TSMC's 4 nm process. The Intel Arc G3 EXTREME uses Intel's 3 nm process.

Specification Differences

| Specification | AMD Ryzen 5 PRO 8645HS | Intel Arc G3 EXTREME |

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

| Cores | 6 | 14 |

| Threads | 12 | 14 |

| Base Clock | 4.30 GHz | 1.90 GHz |

| Boost Clock | 5.00 GHz | 4.70 GHz |

| TDP | 45 W | 25 W |

| Process Node | 4 nm (TSMC) | 3 nm (Intel) |

| L1 Cache | 64 KB per core | 192 KB per core |

| L2 Cache | 1 MB per core | 2.5 MB per core |

| L3 Cache | 16 MB shared | 18 MB shared |

| Memory Type | DDR5 | LPDDR5X |

| Memory Bandwidth | 89.6 GB/s | 136.5 GB/s |

| ECC Support | Yes | No |

| PCIe | Gen 4, 20 lanes | Gen 5, 4 lanes |

| Integrated Graphics | Radeon 760M | Arc B390 |

| Socket | AMD Socket FP7 | Intel BGA 2540 |

| Codename | Hawk Point | Panther Lake |

The Verdict

The benchmark data shows two processors with opposite strengths. The AMD Ryzen 5 PRO 8645HS wins the modern Cinebench R23 tests by wide margins, 49.7% in single-core and 34.7% in multi-core. Those results indicate the AMD part handles current-generation software more efficiently, particularly workloads that benefit from high clock speeds and Zen 4's instruction handling. The 5.00 GHz boost clock and 45 W TDP support this interpretation.

The Intel Arc G3 EXTREME wins the majority of PassMark tests and the older Cinebench releases. Its 14 cores, larger per-core caches, and 136.5 GB/s memory bandwidth drive advantages in floating-point math, physics, encryption, and prime number calculations. The 3 nm process allows a 25 W TDP while delivering these results, making it the more power-efficient option on paper.

For users prioritizing current rendering benchmarks or single-threaded responsiveness, the AMD Ryzen 5 PRO 8645HS presents a clear case. The 49.7% single-core R23 lead is the largest single-thread advantage in the comparison. For users running scientific simulations, encryption-heavy workloads, or parallel integer tasks, the Intel Arc G3 EXTREME shows broader strength across multiple PassMark subtests. The Intel part's average benchmark score sits 18.8% higher overall, which reflects its consistency across a wider range of tests.

The choice depends entirely on workload mix. The data does not show one processor as universally faster; it shows a clear split between modern Cinebench performance and legacy plus PassMark performance. The AMD part wins where clocks and per-core efficiency matter most. The Intel part wins where core count, cache depth, and memory bandwidth dominate.