AMD Ryzen 9 7900X3D vs Intel Core Ultra X9 378H Comparison

The AMD Ryzen 9 7900X3D and Intel Core Ultra X9 378H are fundamentally different processors: one is a 12-core desktop flagship with 3D V-Cache, the other a 16-core mobile chip with a 25W TDP. Benchmark results show the AMD part wins 14 of 17 head-to-head tests, often by large margins, while the Intel part takes only 3 wins, all in specialized workloads. The data clearly indicates the Ryzen 9 7900X3D is the stronger overall performer, particularly in multi-threaded and cache-sensitive tasks, making it the default choice for desktop builders. The Core Ultra X9 378H is a mobile processor with a distinct advantage in floating-point math and single-thread PassMark scores, but its overall benchmark average (47468) trails the AMD part’s average (47908). The 7900X3D sits at the 90th percentile of all CPUs, while the 378H sits at the 89th percentile, so both are high-end, but the AMD chip edges ahead in overall standing.

The Verdict

From the data, the AMD Ryzen 9 7900X3D is the pick for anyone building a desktop PC who prioritizes raw multi-core performance. It leads by a consistent 31.4% across all Cinebench R15, R20, and R23 multicore tests, and its PassMark multithread score of 50317 is 31.4% higher than the Intel’s 38298. The 7900X3D also crushes integer math workloads, scoring 160779 versus 92603, a 73.6% advantage. For tasks like data compression, random string sorting, and extended instruction sets, the AMD chip is 53.6%, 58.3%, and 42.3% ahead respectively. If your work involves compiling code, rendering, or processing large datasets, the 7900X3D is the clear winner.

The Intel Core Ultra X9 378H is a mobile processor, and the data shows it is not a competitor in most desktop-style benchmarks. However, it has two notable wins: PassMark floating-point math (114500 vs 97246, a 15.1% lead) and PassMark single-thread (4453 vs 4126, a 7.3% lead). This makes it interesting for tasks that heavily rely on floating-point calculations, such as certain scientific simulations or financial modeling, where single-core performance also matters. But given its 25W TDP and BGA 2540 socket, it is designed for laptops, not desktops. The verdict is simple: choose the 7900X3D for desktop performance, and only consider the 378H if you are building a mobile workstation and specifically need its floating-point and single-thread strengths.

Architecture Differences

The two processors come from different design philosophies. The AMD Ryzen 9 7900X3D uses Zen 4 architecture on a 5 nm process from TSMC, with a codename of Raphael. It packs 12 cores and 24 threads, with a base clock of 4.40 GHz and a boost clock of 5.60 GHz. A key feature is its 128 MB shared L3 cache, which includes a 1x 64MB 3D V-Cache slice, a significant advantage for cache-sensitive workloads. The Intel Core Ultra X9 378H uses a 3 nm process from Intel itself, with codename Panther Lake. It has 16 cores and 16 threads, with a much lower base clock of 2.00 GHz and a boost of 5.00 GHz. Its cache structure is different: 192 KB L1 per core and 2.5 MB L2 per core, but only 18 MB shared L3. The Intel part also has no 3D V-Cache.

Memory support differs: the AMD chip supports dual-channel DDR5 with a bandwidth of 83.2 GB/s and ECC memory, while the Intel chip supports dual-channel LPDDR5X with a higher bandwidth of 153.6 GB/s but no ECC. PCIe lanes are another split: the 7900X3D offers Gen 5, 24 Lanes (CPU only), whereas the 378H offers only Gen 5, 4 Lanes (CPU only). The AMD processor has an unlocked multiplier, while the Intel one does not. The integrated graphics differ too: the AMD has Radeon Graphics, and the Intel has Arc B390. The Intel part's TDP is just 25W, versus the AMD's 120W, reflecting its mobile design. The AMD chip uses the AM5 socket, the Intel uses BGA 2540.

FAQ

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

A: The AMD Ryzen 9 7900X3D wins all Cinebench multicore tests by 31.4%. For example, in Cinebench R23 multicore, it scores 42767 versus the Intel's 32553. PassMark multithread also shows a 31.4% lead for the AMD chip (50317 vs 38298).

Q: Does the Intel Core Ultra X9 378H win any benchmarks?

A: Yes, it wins 3 of 17 head-to-head tests. It leads in PassMark floating-point math (114500 vs 97246, a 15.1% advantage) and PassMark single-thread (4453 vs 4126, a 7.3% advantage). It also wins the duplicate PassMark singlethread test.

Q: How do their cache sizes compare?

A: The AMD Ryzen 9 7900X3D has 128 MB of shared L3 cache, including a 64 MB 3D V-Cache slice. The Intel Core Ultra X9 378H has only 18 MB of shared L3 cache, though it has larger per-core L1 (192 KB) and L2 (2.5 MB) caches compared to the AMD's 64 KB L1 and 1 MB L2.

Q: Which processor has higher clock speeds?

A: The AMD Ryzen 9 7900X3D has both a higher base clock (4.40 GHz) and boost clock (5.60 GHz) compared to the Intel Core Ultra X9 378H's 2.00 GHz base and 5.00 GHz boost.

Q: Are these processors in the same performance percentile?

A: They are close. The AMD Ryzen 9 7900X3D is in the 90th percentile of all CPUs, while the Intel Core Ultra X9 378H is in the 89th percentile. Their average benchmark scores are 47908 and 47468 respectively.

Q: What are their memory bandwidth capabilities?

A: The Intel Core Ultra X9 378H has a higher memory bandwidth at 153.6 GB/s, while the AMD Ryzen 9 7900X3D has 83.2 GB/s. The Intel part uses LPDDR5X, the AMD uses DDR5.

Specification Differences

The two processors differ on nearly every core specification. The AMD Ryzen 9 7900X3D has 12 cores and 24 threads, while the Intel Core Ultra X9 378H has 16 cores and 16 threads. The AMD part has a base clock of 4.40 GHz and boost of 5.60 GHz, compared to the Intel's 2.00 GHz base and 5.00 GHz boost. TDP is a major split: the AMD is 120W, the Intel is 25W. The AMD uses AMD Socket AM5, the Intel uses Intel BGA 2540. Process node: AMD is 5 nm (TSMC), Intel is 3 nm (Intel). Cache: AMD has 64 KB L1 per core, 1 MB L2 per core, 128 MB L3 shared; Intel has 192 KB L1 per core, 2.5 MB L2 per core, 18 MB L3 shared. Memory support: AMD uses DDR5 with ECC, Intel uses LPDDR5X without ECC. Memory bandwidth: AMD at 83.2 GB/s, Intel at 153.6 GB/s. PCIe: AMD has Gen 5, 24 Lanes, Intel has Gen 5, 4 Lanes. Integrated graphics: AMD has Radeon Graphics, Intel has Arc B390. The AMD multiplier is unlocked; the Intel's is locked. The AMD has a launch MSRP of $599.

Head-to-Head Benchmarks

The AMD Ryzen 9 7900X3D dominates the head-to-head results. In Cinebench tests, the AMD chip wins all six tests by exactly 31.4%: R15 multicore (4310 vs 3281), R15 singlecore (608 vs 462), R20 multicore (17962 vs 13672), R20 singlecore (2535 vs 1929), R23 multicore (42767 vs 32553), and R23 singlecore (6037 vs 4595). This consistent margin indicates a fundamental performance advantage in both single and multi-threaded CPU tasks.

In PassMark tests, the AMD chip wins 9 of 11 tests. The biggest win is in integer math, where it scores 160779 versus the Intel's 92603, a massive 73.6% advantage. Data compression is another strong point: 593838 vs 386591, a 53.6% lead. Random string sorting shows a 58.3% advantage (70662 vs 44648). Extended instructions are 42.3% better (44567 vs 31315). Physics is 38.9% better (4728 vs 3404). Multithread is 31.4% better (50317 vs 38298). Data encryption is 18.3% better (35293 vs 29840). Find prime numbers is 24.6% better (445 vs 357).

The Intel Core Ultra X9 378H wins only in PassMark floating-point math (114500 vs 97246, a 15.1% lead) and PassMark single-thread (4453 vs 4126, a 7.3% lead). These are notable wins, but they are isolated in a sea of AMD victories. The data shows the AMD part is the superior performer in 14 of 17 benchmarks.

Where Each One Wins

The AMD Ryzen 9 7900X3D wins in all multi-threaded, cache-heavy, and integer-based workloads. Its 31.4% lead in Cinebench multicore tests makes it the choice for video rendering, 3D modeling, and software compilation. The 73.6% advantage in integer math points to strong performance in general productivity and database operations. The 53.6% lead in data compression and 58.3% in random string sorting suggests it excels at file archiving and data processing. The 42.3% advantage in extended instructions benefits scientific and engineering software that uses SIMD instructions. With a 38.9% lead in physics, it is also better for physics simulations in engineering or gaming contexts. The 18.3% lead in data encryption is a win for security-focused workloads.

The Intel Core Ultra X9 378H wins in floating-point math, where it is 15.1% faster. This makes it the better option for tasks like financial risk modeling, certain machine learning algorithms, and scientific calculations that rely heavily on FPU throughput. Its 7.3% single-thread advantage in PassMark suggests it may have an edge in lightly-threaded applications that are latency-sensitive, such as some legacy software or specific gaming scenarios. However, these wins are narrow compared to the AMD's margins. The Intel part also has a higher memory bandwidth (153.6 GB/s vs 83.2 GB/s), which could benefit memory-bound tasks, despite its lower L3 cache. Ultimately, the AMD Ryzen 9 7900X3D is the winner for almost all use cases, with the Intel Core Ultra X9 378H only being relevant for specialized floating-point or single-thread workloads on a mobile platform.