AMD Ryzen 5 5500X3D vs Intel Core Ultra X9 388H Comparison

Head-to-Head Benchmarks

The recorded benchmark data shows a decisive sweep in favor of the Intel Core Ultra X9 388H across all eleven PassMark comparisons. The AMD Ryzen 5 5500X3D does not log a single head-to-head victory, with the Intel part leading by margins ranging from 29.3% to 69.3%. The largest discrepancy appears in floating-point math, where the Intel chip scores 112,550 against the AMD's 34,511, a delta of -69.3%. This gap reflects a fundamental throughput advantage rather than a narrow edge in a single workload.

In integer math, the Intel part records 90,882 versus 60,033 for the AMD, a 33.9% deficit for the latter. The multi-threaded PassMark score tells a similar story: Intel posts 36,811, while AMD manages 20,363, a 44.7% shortfall. The single-thread result narrows the gap somewhat, with Intel at 4,280 and AMD at 2,941, still a 31.3% advantage for Intel. The data compression test shows Intel at 361,763 against AMD's 230,392, a 36.3% lead. Data encryption favors Intel by 51%, with scores of 28,490 and 13,967 respectively.

Extended instructions deliver a 46.8% margin for Intel (29,943 vs. 15,925), and random string sorting shows a 46.2% gap (44,010 vs. 23,675). Finding prime numbers exhibits one of the larger relative differences, with Intel at 358 and AMD at 170, a 52.5% deficit. Even the physics test, which often rewards lower-latency cache architectures, favors Intel by 29.3% (3,226 vs. 2,282). The average benchmark score reinforces this picture: Intel sits at 44,466, AMD at 37,018, a difference that places the Intel part in the 88th percentile of all CPUs versus the 85th percentile for AMD.

Architecture Differences

The two processors diverge sharply in their foundational designs. The AMD Ryzen 5 5500X3D uses the Zen 3 architecture on the Vermeer codename, built on a 7 nm process at TSMC. It packs 6 cores and 12 threads, with a base clock of 3.00 GHz and a boost clock of 4.00 GHz. Its cache hierarchy includes 64 KB of L1 per core, 512 KB of L2 per core, and a large 96 MB shared L3 cache, a hallmark of the X3D line. The die size is measured at 74 mm², and the chip operates at a 105 W TDP.

The Intel Core Ultra X9 388H belongs to the Panther Lake family, part of the Core Ultra Series 3. It uses a 3 nm process at Intel's own foundry, with 16 cores and 16 threads. This core count doubles the AMD part, though the thread count matches the AMD's 12 threads? No, the Intel has 16 threads, which is 4 more. The base clock sits at 2.10 GHz, but the boost clock reaches 5.10 GHz, a full 1.10 GHz higher than the AMD's maximum. The cache layout differs substantially: 192 KB of L1 per core, 3 MB of L2 per core, and only 18 MB of shared L3. The Intel part's total L2 capacity (16 cores times 3 MB equals 48 MB) exceeds the AMD's L3, but the shared L3 is far smaller.

Memory support splits along platform lines. The AMD uses DDR4 with dual-channel access and a bandwidth of 51.2 GB/s, while the Intel uses LPDDR5X with dual-channel access and a bandwidth of 153.6 GB/s, a triple-fold increase. The AMD supports ECC memory; the Intel does not. PCIe generations also differ: the AMD offers Gen 4 with 20 CPU lanes, the Intel provides Gen 5 with only 4 CPU lanes. Integrated graphics appear only on the Intel side, with an Arc B390 iGPU; the AMD has no integrated graphics. The socket types are incompatible by design: AMD Socket AM4 for the desktop part, Intel BGA 2540 for the mobile part. The production status for both is listed as Active, with the AMD releasing on June 4, 2025, and the Intel on January 4, 2026.

FAQ

Q: Which processor has the higher boost clock?

A: The Intel Core Ultra X9 388H reaches 5.10 GHz, while the AMD Ryzen 5 5500X3D tops out at 4.00 GHz.

Q: How does the L3 cache compare between the two?

A: The AMD carries 96 MB of shared L3 cache, whereas the Intel has 18 MB of shared L3. The AMD's L3 is over five times larger.

Q: What is the thread count difference?

A: The AMD has 6 cores and 12 threads. The Intel has 16 cores and 16 threads, so the Intel provides 4 more threads but a much higher core count.

Q: Do both support ECC memory?

A: No, only the AMD Ryzen 5 5500X3D supports ECC memory. The Intel Core Ultra X9 388H does not.

Q: Which chip has a higher memory bandwidth?

A: The Intel part measures 153.6 GB/s, while the AMD measures 51.2 GB/s, giving the Intel a threefold bandwidth advantage.

Q: Are the integrated graphics identical?

A: No, the Intel includes an Arc B390 iGPU, while the AMD has no integrated graphics at all.

Specification Differences

The two CPUs differ in nearly every measurable specification. The AMD uses 6 cores and 12 threads, while the Intel uses 16 cores and 16 threads. Base clocks stand at 3.00 GHz for AMD and 2.10 GHz for Intel, but boost clocks reverse the order: 4.00 GHz for AMD, 5.10 GHz for Intel. TDP ratings show a major split: 105 W for AMD, 25 W for Intel. The process node favors Intel at 3 nm versus AMD's 7 nm, and the foundry differs: TSMC for AMD, Intel for the Intel part.

Cache details diverge at each level: L1 is 64 KB per core on AMD versus 192 KB per core on Intel; L2 is 512 KB per core versus 3 MB per core; L3 is 96 MB shared versus 18 MB shared. Memory support changes from DDR4 to LPDDR5X, with bandwidth increasing from 51.2 GB/s to 153.6 GB/s. ECC support is present on AMD only. PCIe lanes drop from 20 Gen 4 lanes on AMD to 4 Gen 5 lanes on Intel. The AMD has no integrated graphics; the Intel ships with Arc B390. The socket is AMD Socket AM4 versus Intel BGA 2540. Market segments differ: Desktop for AMD, Mobile for Intel. The die size is recorded for AMD at 74 mm², while no die size is listed for Intel. Part numbers also differ: 100-000001504 for AMD, SA4QWQ9EK for Intel.

Where Each One Wins

The Intel Core Ultra X9 388H wins every recorded benchmark in the head-to-head comparison, so its strengths are straightforward. The data shows an overwhelming advantage in floating-point math, multi-threaded workloads, and memory-bound tasks. Its 153.6 GB/s memory bandwidth and 5.10 GHz boost clock drive the single-thread score to 4,280, a 31.3% lead over the AMD. The 16-core layout delivers a 44.7% edge in PassMark multi-thread, and the physics test, which often reflects sustained compute, shows a 29.3% advantage. For tasks that stress data compression, encryption, or extended instruction sets, the Intel part leads by 36.3% to 51%, making it the clear choice for content creation, scientific computing, or any workload that scales across cores and memory throughput.

The AMD Ryzen 5 5500X3D, despite losing all head-to-head comparisons, still holds a niche based on other recorded data. Its 96 MB of shared L3 cache is more than five times larger than the Intel's 18 MB, which can benefit workloads with large, repeated data sets that fit in cache. The AMD also supports ECC memory, a feature absent on the Intel, making it relevant for error-sensitive computing environments. Its 105 W TDP, while higher than the Intel's 25 W, pairs with a desktop socket (AM4) and a 74 mm² die size, which may appeal to systems where a fixed-socket desktop platform is preferred over a mobile BGA package. The AMD's release date of June 2025 precedes the Intel's January 2026 date, so it has been available longer in the market.

In practice, the Intel wins on raw performance across the board, with the largest margin in floating-point math (69.3%) and the smallest in physics (29.3%). The AMD's only theoretical advantages are qualitative: cache capacity, ECC support, and a longer market presence. Benchmark results do not show any workload where the AMD closes the gap, so any use case prioritizing measured performance will favor the Intel part. The Intel's 88th percentile rank versus the AMD's 85th percentile confirms the overall standing, even though both sit near the top of the database.