AMD Ryzen 5 PRO 8645HS vs Intel Core Ultra 5 225T Comparison

The AMD Ryzen 5 PRO 8645HS and Intel Core Ultra 5 225T are both 82nd-percentile performers, but they achieve that status through radically different designs. The Intel part wins the majority of benchmark head-to-heads, yet the AMD chip posts critical victories in specific workloads that reveal a clear specialization split.

Head-to-Head Benchmarks

The Intel Core Ultra 5 225T dominates the Cinebench suite with a consistent margin. Across all six Cinebench tests—R15, R20, and R23 in both single-core and multi-core—the Intel chip beats the AMD Ryzen 5 PRO 8645HS by roughly 10%. The multi-core deltas are nearly identical: -10.2% in R15, -10.1% in R20, and -10.1% in R23. Single-core results follow the same pattern, with -10.3% in R15 and -10.1% in both R20 and R23. This uniformity suggests a fundamental per-clock advantage for Intel rather than a workload-specific quirk.

The Intel chip’s lead extends into several Passmark tests. Its most dramatic victory is in `passmark_find_prime_numbers`, where it scores 284 versus AMD’s 73, a 74.3% advantage. That result pairs with a 45% lead in floating-point math (82751 vs 45481) and a 41.2% edge in physics (2053 vs 1208). The Intel part also wins multithread (25358 vs 23569, +7.1%), single-thread (4348 vs 3858, +11.3%), and data encryption (18289 vs 17387, +4.9%).

The AMD Ryzen 5 PRO 8645HS, however, is not without its own decisive wins. Its largest margin comes in random string sorting, where it scores 35472 against Intel’s 28774, a 23.3% advantage. It also leads integer math by 22.2% (72740 vs 59543) and data compression by 13.6% (265826 vs 233998). Extended instructions go AMD’s way too, with a 5.6% edge (21212 vs 20083). These are not narrow victories; the AMD chip is substantially faster in integer-heavy and compression-based tasks.

The final tally shows Intel winning 13 of 17 head-to-head tests, with AMD taking 4. But the AMD wins are clustered in areas that matter for specific professional workflows, which shifts the practical calculus significantly.

Where Each One Wins

The Intel Core Ultra 5 225T is the clear choice for general productivity and computationally diverse workloads. Its Cinebench sweep indicates superior rendering performance across the board—users running CPU-based rendering in applications like Cinema 4D will see roughly 10% better scores from Intel. The physics test win (2053 vs 1208) suggests stronger performance in simulation and game-physics computation. The massive prime-number finding advantage points to Intel’s strength in cryptography-related or number-theoretic tasks. Floating-point math, where Intel leads by 45%, is critical for scientific computing, financial modeling, and any workload relying heavily on FPU throughput.

The AMD Ryzen 5 PRO 8645HS wins where data movement and integer operations dominate. The 23.3% lead in random string sorting indicates superior performance in database operations, log processing, and text manipulation. The 22.2% integer math advantage benefits encryption algorithms, compression utilities, and general office software that still relies heavily on integer instructions. The 13.6% data compression lead is directly relevant to file archiving, backup software, and any disk-heavy workflow. Extended instructions, where AMD leads by 5.6%, covers SIMD workloads like multimedia encoding and certain AI inference tasks.

For a user running a mixed workload—some rendering, some data processing—the Intel chip’s broader wins make it the safer default. But for a developer or analyst who spends hours in database queries, data pipelines, or compression tools, the AMD chip’s targeted advantages could translate to noticeably faster completion times despite losing most benchmarks.

Architecture Differences

These two processors represent fundamentally different design philosophies. The AMD Ryzen 5 PRO 8645HS is a 6-core, 12-thread mobile part built on Zen 4 architecture, codenamed Hawk Point. It uses TSMC’s 4nm process node with 25,000 million transistors on a 178 mm² die. The Intel Core Ultra 5 225T is a 10-core, 10-thread desktop part on Arrow Lake architecture, fabricated on TSMC’s 3nm node with 17,800 million transistors spread across a larger 243 mm² die.

The core configurations tell a story of divergent strategies. AMD relies on simultaneous multithreading to reach 12 threads from 6 cores, while Intel runs 10 physical cores with no hyperthreading. That explains why Intel’s multithread lead is modest (7.1%) despite having 4 more physical cores—AMD’s SMT effectively closes the gap. The Intel chip’s base clock is significantly lower at 2.50 GHz versus AMD’s 4.30 GHz, but boost clocks are closer (4.90 GHz vs 5.00 GHz), suggesting Intel’s design leans on burst performance.

Cache hierarchies differ substantially. Intel allocates 192 KB of L1 per core and 3 MB of L2 per core, while AMD uses 64 KB L1 and 1 MB L2 per core. Intel’s shared L3 is 20 MB versus AMD’s 16 MB. These larger per-core caches likely contribute to Intel’s strong single-thread performance. Both support DDR5 dual-channel memory, but Intel has a higher memory bandwidth at 102.4 GB/s versus AMD’s 89.6 GB/s. AMD supports ECC memory; Intel does not. PCIe connectivity also diverges: Intel offers Gen 5 with 20 lanes, while AMD provides Gen 4 with 20 lanes.

The TDP spread is notable—Intel is rated at 65W versus AMD’s 45W—but the market segments differ: Intel is a desktop part on Socket 1851, while AMD is a mobile part on Socket FP7. The Intel chip integrates Arc Xe-LPG Graphics with 16 execution units, while AMD pairs with Radeon 760M integrated graphics.

FAQ

Q: Which processor has more cores?

A: The Intel Core Ultra 5 225T has 10 cores and 10 threads. The AMD Ryzen 5 PRO 8645HS has 6 cores and 12 threads, using simultaneous multithreading to exceed its physical core count.

Q: Does the AMD chip support ECC memory?

A: Yes, the AMD Ryzen 5 PRO 8645HS supports ECC memory. The Intel Core Ultra 5 225T does not list ECC support.

Q: Which CPU is better for floating-point math?

A: The Intel Core Ultra 5 225T is dramatically better, scoring 82751 in Passmark floating-point math versus AMD’s 45481, a 45% advantage.

Q: What is the process node difference?

A: The Intel Core Ultra 5 225T is built on TSMC’s 3nm process, while the AMD Ryzen 5 PRO 8645HS uses TSMC’s 4nm node.

Q: Which chip wins in data compression?

A: The AMD Ryzen 5 PRO 8645HS wins, scoring 265826 versus Intel’s 233998, a 13.6% advantage.

Q: How do their average benchmark scores compare?

A: The AMD Ryzen 5 PRO 8645HS has an average benchmark score of 30879, slightly above the Intel Core Ultra 5 225T’s 30468. Both sit at the 82nd percentile of all CPUs.

The Verdict

The data presents a clear split. The Intel Core Ultra 5 225T is the superior all-around processor, winning 13 of 17 head-to-head tests including every rendering benchmark and the majority of Passmark subtests. Its consistent 10% lead across Cinebench makes it the straightforward recommendation for rendering, scientific computing, and general heavy multitasking. The 74.3% prime-number advantage and 45% floating-point lead are too large to ignore for anyone running mathematical or cryptographic workloads.

The AMD Ryzen 5 PRO 8645HS, despite losing most comparisons, is the better choice for data-centric tasks. Its 23.3% win in random string sorting and 22.2% lead in integer math make it the superior engine for database work, text processing, and compression-heavy pipelines. The 13.6% compression advantage strengthens this case. For a user whose daily driver is a database query tool, an ETL pipeline, or an archiving utility, the AMD chip will feel faster in practice even though its average benchmark score is nearly identical (30879 vs 30468).

The Intel chip’s 10-core, 10-thread design with larger per-core caches and higher memory bandwidth suits broad, unpredictable workloads. The AMD chip’s 6-core, 12-thread SMT configuration with lower TDP (45W vs 65W) suits mobile deployments where efficiency matters. Both sit at the 82nd percentile, but they arrive there via different strengths. Pick Intel for raw compute breadth; pick AMD for data manipulation and integer-heavy work. The choice hinges entirely on which benchmark family matches your actual workload.