AMD Ryzen 9 PRO 5945 vs Intel Core Ultra X9 378H Comparison

The AMD Ryzen 9 PRO 5945 and Intel Core Ultra X9 378H are nearly inseparable in overall benchmark averages, with the AMD part scoring 47,527 against Intel’s 47,468, a razor-thin 0.1% gap. However, this overall parity masks a starkly divergent performance profile: the Intel Core Ultra X9 378H wins 15 of 17 head-to-head tests, often by double-digit margins, while the AMD Ryzen 9 PRO 5945 secures only 2 wins, albeit with one massive victory in integer math. The data suggests these are not interchangeable competitors; they are optimized for fundamentally different workloads.

Head-to-Head Benchmarks

The Intel Core Ultra X9 378H dominates the Cinebench suite outright. In Cinebench R23 multi-core, Intel scores 32,553 against AMD’s 29,366, a 9.8% lead. The pattern repeats across every Cinebench iteration: R15 multi-core (3,281 vs 2,959, -9.8%), R20 multi-core (13,672 vs 12,333, -9.8%), and the single-core tests, where Intel leads by 9.7-9.8% in R15, R20, and R23 (e.g., R23 single-core: 4,595 vs 4,145). This consistent ~10% margin across all Cinebench versions indicates a fundamental per-thread and multi-thread advantage for Intel in rendering workloads.

Intel’s dominance extends into PassMark’s floating-point and physics tests with crushing severity. In floating-point math, Intel scores 114,500 versus AMD’s 70,291, a 38.6% advantage. Physics is even more lopsided: Intel’s 3,404 nearly doubles AMD’s 1,772, a 47.9% gap. Prime number finding also favors Intel heavily (357 vs 228, -36.1%), and extended instructions show a 13.7% Intel lead (31,315 vs 27,031). Single-thread performance is a clear Intel win: PassMark single-thread shows 4,453 vs 3,499, a 21.4% delta. Even data encryption, a strong AMD area historically, goes to Intel by 11.8% (29,840 vs 26,313).

The AMD Ryzen 9 PRO 5945’s two wins are notable for their magnitude. In PassMark integer math, AMD scores 129,768 against Intel’s 92,603, a staggering 40.1% advantage. This is the single largest delta in either direction across all tests. AMD also wins data compression, scoring 416,599 versus 386,591, a 7.8% lead. Random string sorting is nearly a tie, with Intel edging ahead by just 2.7% (44,648 vs 43,447). In PassMark multi-thread, Intel wins 38,298 vs 34,549 (-9.8%), which aligns with the Cinebench multi-core pattern.

The overall average benchmark score (47,527 for AMD vs 47,468 for Intel) is misleading because it weights these disparate tests equally. The data reveals a clear specialization: Intel wins almost everything that involves throughput, floating-point, and single-thread speed, while AMD wins integer-heavy and compression tasks. The Intel part also holds a 90th percentile rank versus AMD’s 90th percentile, meaning both sit in the same elite tier of all CPUs, but their internal strengths are sharply different.

The Verdict

From the benchmark data, the Intel Core Ultra X9 378H is the superior chip for most users. It wins 15 of 17 tests, including all Cinebench rendering benchmarks, all single-thread metrics, and the largest margin in physics. If the workload involves 3D rendering, scientific simulation, or any floating-point-heavy task, the Intel part is the clear choice. The 38.6% lead in floating-point math and 47.9% lead in physics are decisive and not offset by any AMD advantage in those categories.

The AMD Ryzen 9 PRO 5945 is the pick only for a narrow but real set of use cases. Its 40.1% win in integer math is the single most dominant result in the comparison, suggesting superiority in integer-heavy compute such as certain cryptographic or database operations. Its 7.8% win in data compression also makes it attractive for file archiving or compression server roles. However, these two wins do not compensate for losses elsewhere; the Intel part beats it in data encryption (11.8%), which is often paired with integer workloads.

For a general-purpose desktop or mobile system, the Intel Core Ultra X9 378H’s combined wins in single-thread (21.4% in PassMark), multi-thread (9.8% in Cinebench and PassMark), and floating-point make it the safer recommendation. The AMD part’s overall average is statistically identical (0.1% difference), but that average is pulled up by its two outlier wins. The data does not support recommending AMD unless the specific application is known to be integer-bound or compression-heavy.

Where Each One Wins

The Intel Core Ultra X9 378H wins in every scenario involving sustained multi-core throughput, as evidenced by its 9.8% lead across all three Cinebench multi-core versions and the PassMark multi-thread test. It is also the winner for single-threaded responsiveness, with 21.4% higher PassMark single-thread scores and 9.8% higher Cinebench R23 single-core. Floating-point workloads are an Intel stronghold, with a 38.6% lead in floating-point math and a 47.9% lead in physics simulations. Encryption, extended instructions, and prime number finding also fall to Intel, making it the choice for security-related compute and scientific number crunching.

The AMD Ryzen 9 PRO 5945 wins specifically in integer math, where its 40.1% advantage is the largest margin in the entire comparison. This makes it suited for integer-heavy code such as certain compression algorithms, financial modeling, or software that relies heavily on integer arithmetic. It also wins data compression by 7.8%, reinforcing its utility in archiving and data transfer tasks. However, these are isolated wins; AMD does not win any multi-core, single-core, or floating-point test, so its use case is strictly limited to integer and compression domains.

FAQ

Q: Which CPU has a higher average benchmark score?

A: The AMD Ryzen 9 PRO 5945 has an average benchmark score of 47,527, while the Intel Core Ultra X9 378H scores 47,468, a difference of 0.1% in AMD’s favor.

Q: How does the Intel CPU perform in multi-core rendering compared to AMD?

A: Intel wins all multi-core Cinebench tests by 9.8%, including Cinebench R23 (32,553 vs 29,366), R20 (13,672 vs 12,333), and R15 (3,281 vs 2,959). PassMark multi-thread also goes to Intel by 9.8% (38,298 vs 34,549).

Q: Is there any test where AMD beats Intel significantly?

A: Yes, AMD wins PassMark integer math by 40.1% (129,768 vs 92,603) and data compression by 7.8% (416,599 vs 386,591). These are its only two wins out of 17 tests.

Q: Which CPU has better single-thread performance?

A: The Intel Core Ultra X9 378H is clearly ahead in single-thread tests. PassMark single-thread shows 4,453 vs 3,499 (21.4% lead), and Cinebench R23 single-core shows 4,595 vs 4,145 (9.8% lead).

Q: What is the biggest performance gap between the two CPUs?

A: The largest delta is in PassMark floating-point math, where Intel scores 114,500 against AMD’s 70,291, a 38.6% advantage. The second largest is in physics (3,404 vs 1,772, a 47.9% Intel lead).

Q: How many tests does each CPU win?

A: The Intel Core Ultra X9 378H wins 15 of 17 head-to-head benchmarks. The AMD Ryzen 9 PRO 5945 wins 2.

Architecture Differences

The two processors are built on fundamentally different designs. The AMD Ryzen 9 PRO 5945 uses the Zen 3 architecture on a 7 nm TSMC process, with a codename of Vermeer. It is a 12-core, 24-thread desktop part with 64 MB of L3 cache and 8,300 million transistors spread across a dual-die design of 2x 74 mm². The Intel Core Ultra X9 378H uses the Panther Lake codename on a 3 nm Intel process, with 16 cores and 16 threads (no hyperthreading). Intel’s cache structure differs sharply: 192 KB L1 per core and 2.5 MB L2 per core, with only 18 MB shared L3, versus AMD’s 64 KB L1 and 512 KB L2 per core with a much larger 64 MB L3.

Memory support is another major divergence. AMD supports DDR4 memory with a dual-channel bus and 51.2 GB/s bandwidth, and it includes ECC memory support. Intel uses LPDDR5X with a dual-channel bus and a much higher 153.6 GB/s bandwidth, but no ECC. PCIe capability also differs: AMD offers Gen 4 with 20 CPU lanes, while Intel provides Gen 5 with only 4 CPU lanes. The Intel part includes integrated Arc B390 graphics, whereas the AMD chip has no integrated graphics. Finally, Intel’s process node is 3 nm versus AMD’s 7 nm, and Intel is a mobile segment part with a 25 W TDP, while AMD is a desktop part with a 65 W TDP.

Specification Differences

The core count and threading differ: AMD has 12 cores and 24 threads, while Intel has 16 cores and 16 threads. Clock speeds vary, with AMD’s base at 3.00 GHz and boost at 4.70 GHz, versus Intel’s 2.00 GHz base and 5.00 GHz boost. TDP is a major split: AMD is 65 W, Intel is 25 W. Sockets are incompatible (AMD Socket AM4 vs Intel BGA 2540). Memory support differs as noted (DDR4 vs LPDDR5X), as does memory bandwidth (51.2 GB/s vs 153.6 GB/s). ECC support is exclusive to AMD. PCIe generation and lane count differ (Gen 4, 20 lanes vs Gen 5, 4 lanes). Integrated graphics are present only on Intel (Arc B390). The manufacturing process is 7 nm for AMD and 3 nm for Intel. Release dates differ, with AMD from 2022 and Intel from 2026.