AMD EPYC 4465P vs Intel Core Ultra 9 275HX Comparison

The Intel Core Ultra 9 275HX and AMD EPYC 4465P represent two radically different interpretations of high-end computing: one is a mobile powerhouse, the other a server/workstation processor. The benchmark data reveals a fascinating split, where the winner often depends entirely on the workload. While the Intel chip claims victory in 12 of the 17 head-to-head comparisons, the AMD processor’s wins are decisive in the areas that matter most for raw single-thread muscle.

Head-to-Head Benchmarks

The most dramatic gap appears in single-core Cinebench R23, where the AMD EPYC 4465P scores 6059 against the Intel’s 2204, a 63.6% advantage. This is not a marginal difference; it is a generational leap in per-thread performance. The Cinebench R15 single-core test reinforces this, with AMD winning 610 to 334 (45.2% higher). However, the Intel chip strikes back in the older Cinebench R20 single-core test, winning 2809 to 2544 (10.4% higher), which suggests that the workload’s instruction mix heavily influences which architecture dominates.

In multi-core workloads, the results are contradictory. The Intel Core Ultra 9 275HX leads Cinebench R15 multicore by 29.9% (5619.5 vs 4326) and Cinebench R20 multicore by 10.4% (19899 vs 18025). Yet in Cinebench R23 multicore, the AMD EPYC 4465P flips the script, winning 42918 to 35589, a 17.1% margin. This inversion is striking—the same vendor’s benchmark suite produces opposite winners across versions, indicating that R23’s longer-running workload favors the AMD’s sustained power delivery, while shorter R15 and R20 bursts benefit the Intel’s higher turbo capabilities.

Looking at PassMark suites, Intel dominates the floating-point math test with a massive 80.6% lead (191186 vs 105833). Data encryption also favors Intel heavily, winning 47112 to 32184 (46.4% higher). The Intel chip also wins find prime numbers (448 vs 338, 32.5% higher) and data compression (608381 vs 577210, 5.4% higher). AMD’s counterattacks come in integer math, where it leads 174551 to 155218 (11.1% higher), and physics simulation, winning 3647 to 3338 (8.5% higher). The overall multithread score goes to Intel (55759 vs 49871, 11.8% higher), but the single-thread score is nearly a tie, with Intel edging ahead by just 3% (4713 vs 4575).

Architecture Differences

The fundamental divergence starts with the process node: Intel uses a 3 nm TSMC process, while AMD uses a 4 nm TSMC process. This gives Intel a density advantage, reflected in its 17,800 million transistors packed into a 243 mm² die. AMD counters with 16,630 million transistors spread across two 70.6 mm² dies. The Intel chip is built on the Arrow Lake architecture (Arrow Lake-HX codename), while AMD uses Zen 5 (Grado codename).

Core counts differ significantly: Intel offers 24 cores and 24 threads, while AMD offers only 12 cores but 24 threads via simultaneous multithreading. This explains why Intel wins most multi-threaded tests despite AMD’s higher per-core efficiency. Cache hierarchies are also distinct: Intel has 192 KB L1 per core and 3 MB L2 per core, with 36 MB shared L3. AMD has smaller per-core caches—80 KB L1 and 1 MB L2—but a much larger 64 MB shared L3. The larger L3 cache likely contributes to AMD’s integer math and physics wins, where data locality matters.

The memory subsystems differ as well. Both support DDR5, but Intel’s memory bandwidth is 102.4 GB/s versus AMD’s 89.6 GB/s. Intel’s PCIe implementation offers Gen 5 with 20 lanes (CPU only), while AMD provides Gen 5 with 24 lanes. Intel integrates Arc Xe-LPG Graphics with 64 execution units, whereas AMD includes Radeon Graphics. A critical feature gap is ECC memory support: AMD supports it, Intel does not. The Intel chip is unlocked (multiplier unlocked: true), while the AMD is locked.

Where Each One Wins

The Intel Core Ultra 9 275HX is the clear choice for floating-point-heavy workloads, encryption, and compression. Its 80.6% lead in floating-point math suggests it excels in scientific simulation, 3D rendering, and financial modeling. The 46.4% encryption advantage points to strong performance in VPNs, secure file transfers, and database encryption. Data compression (5.4% win) and random string sorting (9.9% win) make it suitable for archiving tasks and text-processing pipelines. Its 24 physical cores without SMT may also benefit workloads that suffer from hyperthreading overhead.

The AMD EPYC 4465P wins decisively in single-thread performance, as evidenced by the 63.6% lead in Cinebench R23 single-core. This makes it the better fit for legacy applications that rely on one or two fast cores, such as older game engines or single-threaded CAD tools. Its 11.1% integer math win suggests it is stronger in general-purpose computing, database queries, and integer-based algorithms. The 8.5% physics win points to better performance in physics simulation engines, which often use integer-heavy calculations. The AMD’s ECC memory support is crucial for server environments where data integrity is non-negotiable.

Specification Differences

The two processors differ in almost every fundamental specification. Intel offers 24 cores with 24 threads; AMD offers 12 cores with 24 threads. Base clocks are 2.70 GHz for Intel and 3.40 GHz for AMD, while boost clocks are identical at 5.40 GHz. Thermal design power differs: Intel is rated at 55 W, AMD at 65 W. Sockets are incompatible: Intel uses BGA 2114, AMD uses AM5. The process node is 3 nm for Intel versus 4 nm for AMD.

Cache configurations diverge sharply, with Intel’s 36 MB L3 versus AMD’s 64 MB L3. Memory bandwidth favors Intel (102.4 GB/s vs 89.6 GB/s). PCIe lane counts favor AMD (24 vs 20). ECC memory is available only on AMD. Integrated graphics differ: Intel’s Arc Xe-LPG 64EU versus AMD’s Radeon Graphics. The Intel chip is unlocked, the AMD is not. Release dates also differ, with Intel launching on 2025-01-12 and AMD on 2025-05-12.

FAQ

Q: Which processor has higher single-thread performance in Cinebench R23?

A: The AMD EPYC 4465P wins with a score of 6059, which is 63.6% higher than the Intel Core Ultra 9 275HX’s 2204.

Q: Does the Intel chip win all multi-core benchmarks?

A: No. While Intel wins Cinebench R15 multicore (5619.5 vs 4326) and R20 multicore (19899 vs 18025), AMD wins Cinebench R23 multicore (42918 vs 35589) by 17.1%.

Q: What is the difference in core count between the two?

A: The Intel Core Ultra 9 275HX has 24 cores and 24 threads, while the AMD EPYC 4465P has 12 cores and 24 threads.

Q: Which processor supports ECC memory?

A: Only the AMD EPYC 4465P supports ECC memory; the Intel Core Ultra 9 275HX does not.

Q: How close are their overall average benchmark scores?

A: The Intel chip has an average benchmark score of 67469, while the AMD chip scores 66925. The Intel chip is 0.8% higher, as noted in AMD’s nearest rivals list.

Q: What is the largest single-test margin in the head-to-head?

A: The largest margin is in Cinebench R23 single-core, where AMD wins by 63.6%.

The Verdict

The data presents a clear split based on use case. For mobile workstation users needing maximum throughput in floating-point math, encryption, and compression, the Intel Core Ultra 9 275HX is the superior choice. Its 80.6% lead in floating-point math and 46.4% lead in encryption are decisive, and its 24 physical cores provide strong multi-threading headroom. The 55 W TDP is remarkably efficient for the performance on offer, making it suitable for laptops where thermal constraints are tight.

For server and workstation environments prioritizing single-thread responsiveness, integer math, and ECC memory reliability, the AMD EPYC 4465P is the better pick. Its 63.6% single-core lead in Cinebench R23 is the most significant performance gap in the entire comparison, and the 64 MB L3 cache supports the 11.1% integer math win. The 65 W TDP is slightly higher, but the AM5 socket and ECC support are critical for always-on, data-integrity-focused systems. The AMD chip also offers more PCIe lanes (24 vs 20), which is valuable for expandability in server configurations.

The overall average benchmark scores are nearly identical (67469 vs 66925), but the distribution of wins tells the story. If your workload is floating-point-heavy, choose Intel. If it is single-thread-heavy or integer-bound, choose AMD. There is no universal winner; there is only the right tool for the job.