AMD EPYC 4465P vs Intel Core Ultra 7 255HX Comparison

FAQ

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

A: The Intel Core Ultra 7 255HX has an average benchmark score of 67102, while the AMD EPYC 4465P scores 67008. The delta between them is 0.1%, placing both in the 96th percentile of all CPUs.

Q: Which processor has more physical cores?

A: The Intel Core Ultra 7 255HX features 20 cores with 20 threads, whereas the AMD EPYC 4465P has 12 cores with 24 threads. Intel uses a higher core count without hyperthreading, while AMD relies on simultaneous multithreading to reach higher thread counts.

Q: What is the largest single benchmark margin between the two?

A: The biggest win for the Intel chip is in PassMark floating point math, where it scores 168930 versus 104712 for AMD, a delta of 61.3%. The largest AMD victory comes in PassMark integer math, with 176946 against 132810, a 24.9% edge.

Q: Do these processors support error-correcting memory?

A: The AMD EPYC 4465P supports ECC memory, while the Intel Core Ultra 7 255HX does not. This makes the AMD chip more suitable for server or workstation environments where data integrity is critical.

Q: Which processor has a higher boost clock?

A: The AMD EPYC 4465P boosts up to 5.40 GHz, slightly ahead of the Intel Core Ultra 7 255HX, which reaches 5.20 GHz. Despite this, the Intel chip wins all Cinebench single-core tests by a narrow margin.

Q: Are both processors currently in production?

A: Yes, both the Intel Core Ultra 7 255HX and the AMD EPYC 4465P have an active production status. Their release dates differ, with Intel launching in January 2025 and AMD in May 2025.

Architecture Differences

The Intel Core Ultra 7 255HX is built on Arrow Lake-HX architecture using a 3 nm process node from TSMC, while the AMD EPYC 4465P uses Zen 5 architecture (codenamed Grado) on a 4 nm TSMC node. The Intel chip integrates 17,800 million transistors on a 243 mm² die, whereas the AMD processor packs 16,630 million transistors across a dual-chip design measuring 2x 70.6 mm².

Core topology diverges significantly. Intel deploys 20 cores with 20 threads, meaning no simultaneous multithreading; AMD counters with 12 cores and 24 threads, relying on SMT to double thread count. Cache hierarchies also differ: Intel allocates 192 KB of L1 and 3 MB of L2 per core, with 30 MB of shared L3. AMD provides 80 KB of L1 and 1 MB of L2 per core, but a much larger 64 MB shared L3 pool.

The memory controller on the Intel part supports dual-channel DDR5 with a peak bandwidth of 102.4 GB/s, while the AMD chip also uses dual-channel DDR5 but tops out at 89.6 GB/s. AMD includes ECC memory support, a feature absent on the Intel side. PCIe connectivity differs as well: Intel offers Gen 5 with 20 CPU lanes, while AMD provides Gen 5 with 24 lanes.

Integrated graphics distinguish the two: Intel incorporates Arc Xe-LPG Graphics with 64 execution units, while AMD includes a Radeon Graphics solution. The AMD part has an unlocked multiplier disabled (it is locked), whereas the Intel chip features an unlocked multiplier. Socket requirements are entirely different — Intel uses BGA 2114, and AMD uses Socket AM5.

Head-to-Head Benchmarks

Benchmark results indicate a clear pattern: the Intel Core Ultra 7 255HX wins 13 of the 17 head-to-head comparisons, while the AMD EPYC 4465P takes 4. However, the magnitude of victories varies dramatically.

In rendering workloads, Intel holds a consistent but slim edge. Across the Cinebench suite, the Intel chip wins every test by 0.6% to 0.7%. In R15 multi-core, Intel scores 4350 against AMD's 4326; in single-core, it is 614 versus 610. The R23 results follow suit: 43162 for Intel versus 42918 for AMD in multi-core, and 6093 versus 6059 in single-core. These deltas are tight enough that they fall within normal run-to-run variation, yet the pattern is uniform.

The PassMark suite reveals where each architecture excels. Intel dominates floating point math with a score of 168930 against AMD's 104712 — a 61.3% advantage that represents the largest gap in the entire comparison. Intel also leads in find prime numbers, scoring 422 versus 325, a 29.8% margin. Data encryption shows Intel at 41662 against AMD's 33171, a 25.6% win. Extended instructions go to Intel by 7%, with scores of 44240 and 41348.

AMD's counterattacks are equally decisive in specific workloads. Integer math is where AMD shines: 176946 versus 132810, a 24.9% advantage. Physics tests show AMD at 4043 against Intel's 3062, another 24.3% win. Data compression favors AMD at 574486 versus 548248, a 4.6% edge, and random string sorting goes to AMD at 69907 against 66420, a 5% margin.

The multithread score is nearly identical — Intel wins 50739 to 50492, a 0.5% difference — while single-thread results mirror the Cinebench pattern, with Intel ahead 4645 to 4611. This combination of results suggests the two chips have complementary strengths rather than one being universally faster.

Specification Differences

| Specification | Intel Core Ultra 7 255HX | AMD EPYC 4465P |

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

| Cores | 20 | 12 |

| Threads | 20 | 24 |

| Base clock | 2.40 GHz | 3.40 GHz |

| Boost clock | 5.20 GHz | 5.40 GHz |

| TDP | 55 W | 65 W |

| Process node | 3 nm | 4 nm |

| Transistors | 17,800 million | 16,630 million |

| Die size | 243 mm² | 2x 70.6 mm² |

| L1 cache per core | 192 KB | 80 KB |

| L2 cache per core | 3 MB | 1 MB |

| L3 cache (shared) | 30 MB | 64 MB |

| Memory bandwidth | 102.4 GB/s | 89.6 GB/s |

| ECC memory | No | Yes |

| PCIe lanes (CPU) | Gen 5, 20 lanes | Gen 5, 24 lanes |

| Integrated graphics | Arc Xe-LPG 64EU | Radeon Graphics |

| Socket | Intel BGA 2114 | AMD Socket AM5 |

| Unlocked multiplier | Yes | No |

| Market segment | Mobile | Server/Workstation |

| Launch MSRP | — | $399 |

Where Each One Wins

The Intel Core Ultra 7 255HX is the clear choice for floating-point-heavy workloads. Its 61.3% lead in floating point math and 29.8% advantage in prime number finding indicate strong mathematical throughput, making it suitable for scientific computing or financial modeling. The 25.6% edge in data encryption also positions it well for security-related tasks, and its consistent single-core wins — 0.7% in both PassMark and Cinebench — suggest slightly better responsiveness in lightly threaded applications.

The AMD EPYC 4465P wins where integer operations and memory bandwidth for compression matter. Its 24.9% lead in integer math and 24.3% advantage in physics simulations point to strong performance in gaming physics or engineering simulations. The 4.6% win in data compression and 5% in random string sorting indicate efficient handling of file archiving or database-style operations. The larger 64 MB L3 cache likely contributes to these results, even though the memory bandwidth is lower.

For multi-threaded productivity, the scores are nearly dead even: the Intel chip leads PassMark multithread by just 0.5%, and the Cinebench multi-core gaps are all under 1%. Neither processor dominates in general parallel work; the differences surface only in specialized instruction patterns.

The AMD chip's ECC memory support and server/workstation market segment make it the only option for environments requiring error correction. The Intel chip's mobile segment and lower 55 W TDP suggest suitability for power-constrained or portable systems, despite its BGA socket that prevents upgrades.

The Verdict

The data points to a nuanced conclusion rather than a clear winner. The Intel Core Ultra 7 255HX edges out the AMD EPYC 4465P in average score by 0.1%, but the two are effectively matched in overall throughput. Intel wins the majority of head-to-head tests, yet AMD's victories come with larger margins in their respective domains.

For users prioritizing floating point performance, encryption, or single-thread speed, the Intel chip is the better pick. Its 61.3% floating point lead and 25.6% encryption advantage are substantial, and its 20-core configuration provides ample parallelism for most workloads.

For integer-heavy tasks, physics simulations, or data compression, the AMD EPYC 4465P offers decisive advantages. Its 24.9% integer math lead and 24.3% physics edge are difficult to ignore, and ECC memory support makes it the only viable choice for mission-critical data integrity. The AMD chip's $399 launch MSRP also positions it as a fixed-cost option, though pricing analysis is beyond the scope of this comparison.

The deciding factor may come down to platform constraints. Intel uses a mobile BGA socket with integrated Arc graphics, while AMD uses a standard AM5 socket with server-level features. If the workload demands ECC, the AMD chip is the only option. If power efficiency or mobile deployment matters, Intel's 55 W TDP versus AMD's 65 W gives it a slight edge. Both processors sit at the 96th percentile of all CPUs, so either choice delivers top-tier performance — the correct answer depends entirely on which benchmark categories align with the target application.