AMD Ryzen 7 7800X3D vs Intel Core Ultra 7 155H Comparison

The Intel Core Ultra 7 155H and AMD Ryzen 7 7800X3D represent two fundamentally different approaches to CPU design: one a power-sipping mobile processor, the other a desktop-focused powerhouse. The benchmark data shows a clear overall winner in raw performance—the AMD chip claims 13 of 15 head-to-head victories—but the Intel part holds its own in specific workloads. This analysis breaks down exactly where each processor excels and where it falls short, using only the provided benchmark results.

Head-to-Head Benchmarks

The Ryzen 7 7800X3D dominates the multi-threaded and heavily parallel workloads. In Cinebench R15 multi-core, the AMD chip scores 2878.5 against the Intel’s 2450, a 14.9% advantage. That gap widens in Cinebench R23 multi-core, where the 7800X3D’s 16817 score beats the 155H’s 15028 by 10.6%. The PassMark suite tells an even more lopsided story: the AMD part leads by 27.5% in multi-thread (34293 vs 24873), 27.9% in data compression (384669 vs 277353), and 26.8% in data encryption (22346 vs 16358).

The most extreme disparities appear in specialized math workloads. The Ryzen 7 7800X3D’s score of 324 in find prime numbers is a 65.1% improvement over the Intel’s 113. Extended instructions show a 43.6% gap (29166 vs 16456), while physics simulation favors the AMD part by 51% (3522 vs 1727). In integer math, the 7800X3D posts 103639 against 86870, a 16.2% edge. Random string sorting also goes AMD’s way by 29.6% (45418 vs 31990).

Single-threaded performance is closer but still favors AMD. The Ryzen wins Cinebench R15 single-core by 9.4% (281.5 vs 255) and PassMark single-thread by 7.7% (3759 vs 3468). However, the Intel Core Ultra 7 155H claims a narrow victory in Cinebench R23 single-core, scoring 1743 against 1713, a 1.8% margin. The Intel part also wins floating-point math by 4.1%, scoring 63703 versus the AMD’s 61187.

The average benchmark scores reflect this overall trend: the 7800X3D averages 33079, while the 155H averages 32697. Both sit at the 83rd percentile among all CPUs, though the AMD chip’s nearest rivals include the Ryzen 7 8700G and Core i7-13650HX, while the Intel part competes with the Core i5-14600T and Ryzen 5 7400F. The Intel’s wins are real but limited to two specific tests, making the AMD part the clear performance leader in the vast majority of measured workloads.

Architecture Differences

The two processors come from opposite sides of the computing spectrum. The Intel Core Ultra 7 155H is a mobile chip built on Intel’s Meteor Lake architecture, fabricated on a 7 nm process at Intel’s own foundries. It features 16 cores and 22 threads, drawing a 28 W TDP. The AMD Ryzen 7 7800X3D uses the Zen 4 architecture with the Raphael codename, built on a 5 nm process by TSMC, with 8 cores and 16 threads and a 120 W TDP.

Cache configurations differ dramatically. The Intel part allocates 112 KB of L1 per core and 2 MB of L2 per core, with 24 MB of shared L3. The AMD chip has smaller per-core caches—64 KB L1 and 1 MB L2—but a massive 96 MB of shared L3, which explains its dominance in cache-sensitive workloads like data compression and physics. The AMD processor also lists 11,270 million transistors on a 71 mm² die, while the Intel chip’s transistor count and die size are not provided.

Memory support and I/O also diverge. Both support DDR5 and dual-channel memory, but the Intel part’s memory bandwidth is rated at 89.6 GB/s versus AMD’s 83.2 GB/s. The Intel chip offers PCIe Gen 5 with 8 lanes (CPU only), while the AMD part provides Gen 5 with 24 lanes. ECC memory is supported only on the AMD side. Integrated graphics differ as well: Intel uses Arc Xe-LPG with 128 execution units, while AMD relies on its Radeon Graphics. The Intel part uses an Intel BGA 2049 socket, the AMD chip uses AMD Socket AM5.

Clock speeds favor AMD: the 7800X3D runs at a 4.20 GHz base and 5.00 GHz boost, versus the 155H’s 3.80 GHz base and 4.80 GHz boost. The AMD part launched in January 2023 with a $449 MSRP, while the Intel chip arrived in December 2023 at $503. Both processors are currently active in production, and neither has an unlocked multiplier.

Where Each One Wins

The AMD Ryzen 7 7800X3D is the obvious choice for compute-heavy tasks. Its 96 MB L3 cache and higher clock speeds drive wins in data compression, encryption, extended instructions, prime number finding, integer math, multi-threaded rendering, and physics simulation. The 27.5% lead in PassMark multi-thread and 10.6% lead in Cinebench R23 multi-core make it the superior option for video rendering, scientific computing, and any workload that scales across all cores. The 51% margin in physics simulation suggests it handles game physics and similar real-time calculations with far greater ease.

The Intel Core Ultra 7 155H wins in two specific areas: Cinebench R23 single-core (by 1.8%) and floating-point math (by 4.1%). These are narrow but meaningful victories for lightly threaded tasks that rely on floating-point operations, such as certain scientific simulations or financial modeling. The Intel chip’s higher memory bandwidth (89.6 GB/s vs 83.2 GB/s) and its 22 threads—six more than the AMD part—give it an edge in memory-bound floating-point workloads. Its 28 W TDP also makes it far more suitable for thin-and-light laptops, though the data does not include battery life or thermal measurements.

For single-threaded performance beyond the R23 test, AMD still leads: the 7800X3D wins Cinebench R15 single-core by 9.4% and PassMark single-thread by 7.7%. The Intel part’s single-core win is therefore an outlier in the broader benchmark set, not a consistent trend. The AMD chip’s overall benchmark average is 33079, about 1.2% higher than the Intel’s 32697, reinforcing its general-purpose superiority.

FAQ

Q: Which processor is faster in multi-core workloads?

A: The AMD Ryzen 7 7800X3D wins all multi-core tests in the head-to-head data. It leads by 14.9% in Cinebench R15, 10.6% in Cinebench R23, and 27.5% in PassMark multi-thread.

Q: Does the Intel Core Ultra 7 155H win any benchmarks?

A: Yes, it wins two of 15 head-to-head tests: Cinebench R23 single-core by 1.8% (1743 vs 1713) and PassMark floating-point math by 4.1% (63703 vs 61187).

Q: How do their cache sizes compare?

A: The AMD chip has 96 MB of shared L3, while the Intel part has 24 MB. The Intel chip has larger per-core L1 (112 KB vs 64 KB) and L2 (2 MB vs 1 MB) caches.

Q: What are their TDP ratings?

A: The Intel Core Ultra 7 155H is rated at 28 W, while the AMD Ryzen 7 7800X3D is rated at 120 W.

Q: Which processor supports ECC memory?

A: Only the AMD Ryzen 7 7800X3D supports ECC memory. The Intel part does not.

Q: How do their average benchmark scores compare?

A: The AMD chip averages 33079, while the Intel chip averages 32697. Both are at the 83rd percentile of all CPUs.

The Verdict

The data is unambiguous: the AMD Ryzen 7 7800X3D is the stronger processor for almost every measured workload. It wins 13 of 15 head-to-head tests, with margins ranging from 7.7% in single-threaded performance to 65.1% in prime number finding. Its 96 MB L3 cache delivers massive gains in data-heavy tasks, and its higher clock speeds (4.20 GHz base, 5.00 GHz boost) translate to consistent wins in both single-core and multi-core benchmarks. Anyone building a desktop for gaming, content creation, or scientific computing should choose the 7800X3D without hesitation.

The Intel Core Ultra 7 155H is not without merit, but its appeal lies outside raw performance. Its two benchmark wins—Cinebench R23 single-core and floating-point math—show it can hold its own in niche workloads. More importantly, its 28 W TDP makes it viable for mobile devices, unlike the 120 W desktop-bound AMD chip. It also offers more threads (22 vs 16) and higher memory bandwidth (89.6 GB/s vs 83.2 GB/s). However, the data does not include battery or thermal tests, so the Intel part’s practical advantage in laptops is implied rather than proven. For desktop users prioritizing performance, the AMD Ryzen 7 7800X3D is the clear winner; for mobile users who need a capable processor, the Intel Core Ultra 7 155H is the only option of the two.

Specification Differences

| Specification | Intel Core Ultra 7 155H | AMD Ryzen 7 7800X3D |

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

| Cores | 16 | 8 |

| Threads | 22 | 16 |

| Base Clock | 3.80 GHz | 4.20 GHz |

| Boost Clock | 4.80 GHz | 5.00 GHz |

| TDP | 28 W | 120 W |

| Socket | Intel BGA 2049 | AMD Socket AM5 |

| Architecture | Meteor Lake | Zen 4 (Raphael) |

| Process Node | 7 nm (Intel) | 5 nm (TSMC) |

| L1 Cache | 112 KB per core | 64 KB per core |

| L2 Cache | 2 MB per core | 1 MB per core |

| L3 Cache | 24 MB shared | 96 MB shared |

| Memory Bandwidth | 89.6 GB/s | 83.2 GB/s |

| ECC Memory | No | Yes |

| PCIe Lanes | Gen 5, 8 lanes | Gen 5, 24 lanes |

| Integrated Graphics | Arc Xe-LPG 128EU | Radeon Graphics |

| Market Segment | Mobile | Desktop |

| Release Date | 2023-12-13 | 2023-01-03 |

| Launch MSRP | $503 | $449 |

| Transistors | Not provided | 11,270 million |

| Die Size | Not provided | 71 mm² |