AMD Ryzen 9 7945HX vs Intel Xeon 636 Comparison

The Verdict

The data splits decisively by workload type. The Intel Xeon 636 wins 4 head-to-head benchmarks, while the AMD Ryzen 9 7945HX wins 11. However, the Intel part’s victories are overwhelmingly concentrated in single-threaded and lightly-threaded tasks, where its advantage is often massive. The AMD part dominates multi-threaded throughput, memory-heavy operations, and integer work.

For a workstation user running rendering engines that scale with thread count, the Ryzen 9 7945HX is the stronger pick in aggregate: its Cinebench R15 multi-core score is 28.1% higher, and it leads by 18.6% in PassMark multi-thread. But for database or latency-sensitive single-thread workloads, the Xeon 636 is clearly superior: its Cinebench R23 single-core score is 174.7% higher, and its R15 single-core score is 74.4% higher. The Xeon 636 also wins PassMark physics by 45.8%, indicating a strong advantage in simulation or physics-based tasks that rely on single-core branch handling.

The Ryzen 9 7945HX is a 16-core mobile part with a 55 W TDP, while the Xeon 636 is a 12-core server/workstation part with a 170 W TDP. The Ryzen’s wins come despite far lower power draw, but the Xeon’s single-core dominance stems from a base clock of 3.50 GHz versus 2.50 GHz and a boost of 4.70 GHz versus 5.40 GHz — meaning the Xeon holds higher clocks at base yet the Ryzen boosts higher. The data suggests: pick the Xeon 636 for single-thread-critical server tasks; pick the Ryzen 9 7945HX for parallel compute and mobile deployment.

Architecture Differences

The Intel Xeon 636 uses Granite Rapids architecture, built on a 5 nm process at Intel’s foundry, with a die size of 598 mm². It has 12 cores and 24 threads. The AMD Ryzen 9 7945HX uses Zen 4 architecture under the Dragon Range codename, also on a 5 nm process but fabricated by TSMC, with a die size of 2x 71 mm² and 13,140 million transistors. The Ryzen has 16 cores and 32 threads.

Cache configurations differ markedly. The Xeon 636 provides 112 KB of L1 per core, 2 MB of L2 per core, and 48 MB of shared L3. The Ryzen 9 7945HX provides 64 KB L1 per core, 1 MB L2 per core, and 64 MB shared L3. The Ryzen has 33.3% more L3 cache (64 MB vs 48 MB), but the Xeon has double the L2 per core.

Memory support is DDR5 for both, but the Xeon uses a quad-channel memory bus with 204.8 GB/s bandwidth, while the Ryzen uses dual-channel with 83.2 GB/s. That is a 146% bandwidth advantage for the Xeon, which likely explains some of its single-core wins in memory-latency-sensitive tests. Both support ECC memory. The Xeon offers PCIe Gen 5 with 80 lanes (CPU only), versus 28 lanes for the Ryzen — a major difference for expansion-heavy server workloads.

The Xeon has no integrated graphics; the Ryzen includes Radeon 610M. The Xeon’s socket is Intel Socket 4710, while the Ryzen uses AMD Socket FL1. Both parts have an unlocked multiplier. The Xeon is from the Xeon 600 (Granite Rapids-WS) generation with a release date of 2026-02-01; the Ryzen is from the 7000 series with a release date of 2023-01-03. The Xeon’s launch MSRP is $639; the Ryzen has no launch MSRP listed.

Where Each One Wins

The Intel Xeon 636 wins in single-core and physics-based tests. Its Cinebench R23 single-core score of 5330 is 174.7% higher than the Ryzen’s 1940. Its R15 single-core score of 537 is 74.4% higher than 308. In PassMark physics, the Xeon scores 3645 versus 2500, a 45.8% lead. These results indicate a clear advantage for workloads that depend on a single thread’s instruction throughput, such as legacy database queries, single-threaded scripting, or serial simulation steps.

The AMD Ryzen 9 7945HX wins in essentially all multi-threaded and data-processing benchmarks. Its Cinebench R15 multi-core score is 5289 versus 3805 (28.1% higher). It leads PassMark data compression by 22.2% (707249 vs 550395), data encryption by 36.3% (42703 vs 27193), and integer math by 33.4% (207524 vs 138281). It also wins floating-point math (123390 vs 107826, 12.6% higher), extended instructions (51834 vs 43282, 16.5% higher), random string sorting (81736 vs 54420, 33.4% higher), and find prime numbers (284 vs 255, 10.2% higher).

The Ryzen’s PassMark single-thread score of 4040 is only 2.5% higher than the Xeon’s 3937, so the Ryzen’s multi-thread wins are not due to single-core speed but to having 16 cores versus 12. The Xeon wins Cinebench R23 multi-core by 12.8% (37757 vs 33459) despite fewer cores, which suggests its higher base clock and memory bandwidth help in that specific render test. But in PassMark multi-thread, the Ryzen leads by 18.6% (54548 vs 44421).

FAQ

Q: Which CPU has better single-core performance?

A: The Intel Xeon 636 wins decisively in Cinebench single-core tests: 537 vs 308 in R15 (74.4% higher) and 5330 vs 1940 in R23 (174.7% higher). The Ryzen 9 7945HX edges ahead in PassMark single-thread at 4040 vs 3937 (2.5% higher).

Q: Which CPU is better for multi-threaded workloads?

A: The AMD Ryzen 9 7945HX wins most multi-thread tests: Cinebench R15 multi-core by 28.1% (5289 vs 3805) and PassMark multi-thread by 18.6% (54548 vs 44421). However, the Xeon 636 wins Cinebench R23 multi-core by 12.8% (37757 vs 33459).

Q: How do their memory bandwidths compare?

A: The Xeon 636 has a quad-channel memory bus with 204.8 GB/s bandwidth. The Ryzen 9 7945HX has a dual-channel bus with 83.2 GB/s. The Xeon’s bandwidth is 146% higher.

Q: What about cache sizes?

A: The Ryzen 9 7945HX has 64 MB shared L3 versus 48 MB on the Xeon 636. The Xeon has 2 MB L2 per core versus 1 MB on the Ryzen, and 112 KB L1 per core versus 64 KB.

Q: Do both support ECC memory?

A: Yes, both the Intel Xeon 636 and AMD Ryzen 9 7945HX support ECC memory.

Q: Which CPU has more PCIe lanes?

A: The Xeon 636 provides 80 PCIe Gen 5 lanes (CPU only), while the Ryzen 9 7945HX provides 28 PCIe Gen 5 lanes (CPU only). The Xeon has 52 more lanes.

Head-to-Head Benchmarks

The largest win for the Intel Xeon 636 is Cinebench R23 single-core, where it scores 5330 versus 1940 for the Ryzen — a 174.7% delta. This is not a marginal edge; it is a fundamental single-thread performance gap. The Xeon also wins Cinebench R15 single-core by 74.4% (537 vs 308) and PassMark physics by 45.8% (3645 vs 2500). In Cinebench R23 multi-core, the Xeon wins by 12.8% (37757 vs 33459), which is its only multi-core win.

The AMD Ryzen 9 7945HX’s largest win is Cinebench R15 multi-core, where it scores 5289 versus 3805 — a 28.1% lead. In PassMark data encryption, the Ryzen leads by 36.3% (42703 vs 27193). For PassMark integer math and random string sorting, the Ryzen leads by 33.4% in both (207524 vs 138281 and 81736 vs 54420, respectively). The Ryzen also wins PassMark data compression by 22.2% (707249 vs 550395) and PassMark multi-thread by 18.6% (54548 vs 44421).

Smaller Ryzen wins include PassMark extended instructions (51834 vs 43282, 16.5% higher), floating-point math (123390 vs 107826, 12.6% higher), and find prime numbers (284 vs 255, 10.2% higher). The PassMark single-thread test is nearly a tie: 4040 vs 3937, a 2.5% Ryzen edge. In total, the Ryzen wins 11 of 15 head-to-head benchmarks, but its wins are mostly in the 10-36% range, while the Xeon’s single-core wins are 74-175% — a much larger magnitude per win.

Specification Differences

The two CPUs differ across nearly every specification field. The Intel Xeon 636 has 12 cores and 24 threads; the AMD Ryzen 9 7945HX has 16 cores and 32 threads — 33.3% more cores and threads. Base clocks are 3.50 GHz for the Xeon versus 2.50 GHz for the Ryzen, a 1.0 GHz difference. Boost clocks are 4.70 GHz for the Xeon versus 5.40 GHz for the Ryzen, a 0.7 GHz difference in the Ryzen’s favor.

TDP is a major differentiator: the Xeon is rated at 170 W, the Ryzen at 55 W — over three times lower for the Ryzen. Sockets are incompatible: Intel Socket 4710 versus AMD Socket FL1. The process node is 5 nm for both, but the foundry differs: Intel for the Xeon, TSMC for the Ryzen. Die size is 598 mm² for the Xeon versus 2x 71 mm² for the Ryzen — the Xeon’s die is over 4 times larger.

Cache per core: the Xeon has 112 KB L1 and 2 MB L2 per core; the Ryzen has 64 KB L1 and 1 MB L2 per core. Shared L3: 48 MB for the Xeon versus 64 MB for the Ryzen. Memory bus: quad-channel for the Xeon versus dual-channel for the Ryzen. Memory bandwidth: 204.8 GB/s versus 83.2 GB/s. PCIe lanes: 80 versus 28 (both Gen 5, CPU only). Integrated graphics: N/A for the Xeon, Radeon 610M for the Ryzen. Market segment: Server/Workstation for the Xeon, Mobile for the Ryzen. Release dates: 2026-02-01 for the Xeon, 2023-01-03 for the Ryzen. The Xeon has a launch MSRP of $639; the Ryzen has no launch MSRP listed. Both have unlocked multipliers and support ECC memory.