AMD Ryzen 7 5800X3D vs Intel Core i9-12900H Comparison

The Intel Core i9-12900H and AMD Ryzen 7 5800X3D occupy very different positions in the market, yet their benchmark scores place them within striking distance of each other. The data shows a classic split: Intel’s mobile flagship leans on high-frequency single-core performance and floating-point throughput, while AMD’s desktop chip counters with brute-force multi-threaded stability and cache-sensitive workloads. Across 21 head-to-head benchmarks, the Intel part wins 12 and the AMD part wins 9, but the margins tell a more nuanced story than the raw win count suggests. The average benchmark score for the i9-12900H is 28003, slightly ahead of the 5800X3D’s 27896, yet both sit at the 80th percentile among all CPUs, indicating a near-total performance parity in aggregate workloads.

Head-to-Head Benchmarks

The most decisive Intel victories come in single-threaded and floating-point tests. In 3dmark_single_thread, the i9-12900H scores 999 against 884 for the 5800X3D, a 13% advantage. That gap widens dramatically in cinebench_r23_singlecore, where Intel’s 1863.5 beats AMD’s 1452 by 28.3%. This pattern repeats in passmark_single_thread, with Intel leading 3717 to 3234, a 14.9% margin. The i9-12900H also dominates passmark_floating_point_math, scoring 67940 versus 50100, an enormous 35.6% lead. These results align with Intel’s higher boost clock of 5.00 GHz versus AMD’s 4.50 GHz, though the architecture differences also play a role.

Intel’s multi-core wins are less consistent but still notable. In cinebench_r23_multicore, the i9-12900H scores 15946.5 against 14317, an 11.4% advantage. The cinebench_r15_multicore result is closer, 2576.5 versus 2413, a 6.8% lead. Intel also wins passmark_integer_math (93828 vs 88608, +5.9%) and passmark_random_string_sorting (35296 vs 33776, +4.5%). In the 3dmark_2_threads test, Intel edges out AMD 1891 to 1746, an 8.3% margin, and in 3dmark_4_threads, the difference is razor-thin at 3398 versus 3392, a 0.2% Intel advantage.

AMD’s wins are concentrated in heavier multi-threaded and cache-sensitive tasks. The 5800X3D takes 3dmark_16_threads with 7299 versus 6457, an 11.5% deficit for Intel. The 3dmark_8_threads result is even more lopsided: 5906 versus 5074, a 14.1% AMD advantage. In 3dmark_max_threads, AMD leads 7285 to 6927, a 4.9% margin. The passmark_multithread score favors AMD 28309 to 27340, a 3.4% edge. The standout AMD victory is passmark_find_prime_numbers, where the 5800X3D scores 227 against Intel’s 107, a staggering 52.9% advantage. This suggests the AMD chip’s large L3 cache is particularly effective for prime-number algorithms. AMD also wins passmark_physics (2884 vs 1753, +39.2%), passmark_extended_instructions (22580 vs 18875, +16.4%), passmark_data_encryption (20258 vs 18548, +8.4%), and passmark_data_compression (329688 vs 316714, +3.9%).

The Verdict

The data points to a clear split: the Intel Core i9-12900H is the superior processor for single-threaded responsiveness and floating-point math, while the AMD Ryzen 7 5800X3D excels in specific multi-threaded and cache-bound workloads. For users prioritizing applications that rely on high clock speeds and per-core efficiency—such as legacy single-threaded software or certain physics simulations—the i9-12900H is the stronger choice. Its 28.3% lead in cinebench_r23_singlecore and 35.6% lead in floating-point math are decisive. Conversely, for workloads that hammer on cache hierarchy and integer-heavy prime-number calculations, the 5800X3D’s 52.9% victory in find_prime_numbers and 39.2% win in physics make it indispensable.

The overall average benchmark scores are nearly identical (28003 vs 27896), meaning neither chip provides a general-purpose advantage. The i9-12900H’s 14 cores and 20 threads give it a theoretical thread-count edge, yet the 5800X3D’s 8 cores and 16 threads still win 3dmark_16_threads by 11.5%, suggesting AMD’s Zen 3 architecture extracts more performance per thread in sustained multi-core loads. The verdict is not about which is “better” but which fits the workload profile. For a mobile platform with a 45W TDP, the i9-12900H delivers impressive single-core and floating-point performance. For a desktop platform with a 105W TDP, the 5800X3D offers unmatched cache-sensitive throughput.

Where Each One Wins

The Intel Core i9-12900H wins in scenarios that benefit from high boost clocks and strong per-core efficiency. The 5.00 GHz boost clock, combined with a 28.3% win in cinebench_r23_singlecore, indicates superiority in lightly-threaded applications like web browsing, office productivity, and legacy software that cannot utilize many cores. The 35.6% lead in floating-point math suggests the i9-12900H is better suited for scientific computing, financial modeling, and any workload with heavy FPU usage. Intel also wins in random string sorting (4.5% ahead), which is relevant for database operations and text processing. The 8.3% win in 3dmark_2_threads further confirms its strength in dual-threaded tasks.

The AMD Ryzen 7 5800X3D wins in scenarios that stress cache capacity and multi-threaded integer performance. Its 96 MB of shared L3 cache, versus Intel’s 24 MB, directly contributes to the 52.9% win in find_prime_numbers and the 39.2% win in physics. The 14.1% lead in 3dmark_8_threads indicates better scaling when eight threads are active, which is typical for modern game engines and video encoding. The 11.5% win in 3dmark_16_threads shows the 5800X3D can hold its own even with more threads than it has cores. AMD also wins in data compression (3.9% ahead), encryption (8.4% ahead), and extended instructions (16.4% ahead), making it a better choice for archive extraction, secure communication, and SIMD-heavy code.

FAQ

Q: Which processor has the higher single-thread performance?

A: The Intel Core i9-12900H leads in all single-thread benchmarks. It wins 3dmark_single_thread by 13% (999 vs 884), cinebench_r23_singlecore by 28.3% (1863.5 vs 1452), and passmark_single_thread by 14.9% (3717 vs 3234).

Q: Why does the AMD Ryzen 7 5800X3D win so decisively in passmark_find_prime_numbers?

A: The 5800X3D scores 227 versus Intel’s 107, a 52.9% advantage. This is attributed to its 96 MB shared L3 cache, which allows the entire working set of the prime-number algorithm to reside in cache, avoiding slower memory access.

Q: How do the two compare in overall multi-threaded performance?

A: The AMD chip wins passmark_multithread by 3.4% (28309 vs 27340) and 3dmark_16_threads by 11.5% (7299 vs 6457). However, Intel wins cinebench_r23_multicore by 11.4% (15946.5 vs 14317), showing the result depends on the specific benchmark’s scaling behavior.

Q: Which processor has the higher boost clock?

A: The Intel Core i9-12900H has a boost clock of 5.00 GHz, while the AMD Ryzen 7 5800X3D has a boost clock of 4.50 GHz. This 0.50 GHz difference contributes to Intel’s single-thread wins.

Q: What is the core and thread configuration for each?

A: The Intel Core i9-12900H has 14 cores and 20 threads, while the AMD Ryzen 7 5800X3D has 8 cores and 16 threads. Despite fewer threads, AMD wins several multi-threaded tests, indicating higher per-thread efficiency.

Q: Are these processors in the same market segment?

A: No. The Intel Core i9-12900H is a mobile processor (Intel BGA 1744 socket) with a 45W TDP, while the AMD Ryzen 7 5800X3D is a desktop processor (AMD Socket AM4) with a 105W TDP. The Intel part is still in active production, whereas the AMD part is end-of-life.

Architecture Differences

The two processors diverge fundamentally in architecture, node, and cache design. The Intel Core i9-12900H uses Alder Lake-H architecture built on Intel’s 10 nm process, with a die size of 217 mm². It integrates 14 cores (6 performance and 8 efficiency) and 20 threads, with a base clock of 2.50 GHz and a boost clock of 5.00 GHz. Its cache hierarchy includes 80 KB of L1 per core, 1.25 MB of L2 per core, and 24 MB of shared L3. The memory support spans DDR4 and DDR5 over a dual-channel bus. Intel includes Iris Xe 96EU integrated graphics, making the chip self-contained for mobile systems. The PCIe interface is Gen 4 with 20 lanes from the CPU. The TDP is 45W, reflecting its mobile design.

The AMD Ryzen 7 5800X3D uses Zen 3 architecture (codenamed Vermeer) built on TSMC’s 7 nm process, with a die size of 74 mm² and 8,850 million transistors. It has 8 cores and 16 threads, with a base clock of 3.40 GHz and a boost clock of 4.50 GHz. The cache setup is notably different: 64 KB of L1 per core, 512 KB of L2 per core, and a massive 96 MB of shared L3. This L3 capacity is the primary driver behind its wins in cache-sensitive benchmarks. Memory support is limited to DDR4 over a dual-channel bus, with a memory bandwidth of 51.2 GB/s. The chip supports ECC memory, unlike Intel. It has no integrated graphics, requiring a discrete GPU. The PCIe interface is Gen 4 with 20 lanes, matching Intel. The TDP is 105W, and the socket is AMD Socket AM4, which is end-of-life.

The process node difference (10 nm Intel vs 7 nm TSMC) and cache capacity (24 MB vs 96 MB) explain most performance deltas. Intel’s smaller L3 cache limits cache-bound workloads, while AMD’s larger L3 enables the 52.9% lead in find_prime_numbers. Intel’s higher boost clock and newer architecture drive its single-thread and floating-point wins. The absence of integrated graphics on AMD and presence on Intel also dictates platform requirements, with Intel offering an all-in-one mobile solution and AMD requiring a separate GPU for desktop builds. The production status differs as well: Intel remains active, while AMD is end-of-life.