Intel Xeon 6745P vs Intel Xeon w9-3575X Comparison

The Intel Xeon 6745P and Intel Xeon w9-3575X are both high-end server/workstation processors that land in the 98th percentile of all CPUs, yet they approach performance from different angles. The 6745P, built on Granite Rapids, wins the majority of head-to-head benchmarks with a 9-7 victory, but the w9-3575X takes the single-thread crown and excels in physics workloads. The data shows a matchup between a newer, more efficient architecture with a massive L3 cache, and a higher-core-count part with a higher boost clock and an unlocked multiplier. This analysis breaks down exactly where each chip dominates and which workloads favor one over the other.

Head-to-Head Benchmarks

The Intel Xeon 6745P secures its win count primarily through consistent, modest leads across Cinebench and several PassMark tests. In Cinebench R23 multi-core, the 6745P scores 71,578 against the w9-3575X's 70,837, a narrow 1% edge. That pattern repeats in Cinebench R15 and R20 multi-core, where the 6745P leads by 1% in each case (7,214 vs 7,140 and 30,062 vs 29,751 respectively). Single-core Cinebench results are equally tight, with the 6745P ahead by 1% in R15 (1,018 vs 1,008), R20 (4,244 vs 4,200), and R23.

The 6745P’s largest victories come in integer-heavy and data-processing tasks. In PassMark integer math, it posts 336,926 against the w9-3575X's 298,224 — a decisive 13% advantage. Data compression shows a 10.9% lead (1,352,801 vs 1,219,584), and data encryption follows with a 7.1% edge (66,665 vs 62,258). PassMark multi-thread performance also favors the 6745P, but only by 1% (84,210 vs 83,338).

The Intel Xeon w9-3575X counters with strong single-thread and floating-point results. PassMark single-thread shows the w9-3575X at 3,672 versus 3,450 for the 6745P, a 6% advantage. The w9-3575X also wins PassMark physics by a wide margin: 6,836 vs 6,144, a 10.1% difference. Floating-point math goes to the w9-3575X at 273,398 vs 267,438 (a 2.2% edge), and extended instructions show a 1.4% lead (109,843 vs 108,326). The w9-3575X edges out the 6745P in find prime numbers (687 vs 681) and random string sorting (134,723 vs 133,528), both by under 1%.

The overall benchmark averages reflect these mixed results: the 6745P holds an average benchmark score of 154,858, while the w9-3575X sits at 144,323. The 6745P’s rival set includes the AMD EPYC 9355P at 160,358 (3.4% higher) and the AMD EPYC 9375F at 162,497 (4.7% higher), while the w9-3575X’s closest rival is the AMD EPYC 7643P at 144,824, a mere 0.3% difference.

Architecture Differences

The two processors represent different Intel design philosophies. The Intel Xeon 6745P uses the Granite Rapids architecture on a 5 nm process node, while the Intel Xeon w9-3575X is built on Sapphire Rapids with a 10 nm node. This process difference contributes to the 6745P’s die size of 2x 598 mm² versus the w9-3575X’s 4x 477 mm² configuration.

Core counts diverge significantly: the 6745P has 32 cores and 64 threads, while the w9-3575X offers 44 cores and 88 threads. Despite having fewer cores, the 6745P maintains competitive multi-core performance thanks to its architecture. The base clock of the 6745P is higher at 3.10 GHz versus 2.20 GHz, but the w9-3575X boosts higher at 4.80 GHz versus 4.30 GHz.

Cache layouts are starkly different. The 6745P provides 112 KB of L1 per core and 2 MB of L2 per core, but its L3 cache is 336 MB shared — a massive pool. The w9-3575X offers 80 KB L1 per core, 2 MB L2 per core, and just 97.5 MB of L3. This 336 MB vs 97.5 MB difference is the largest architectural gap between the two.

Memory bandwidth also favors the 6745P: 409.6 GB/s versus 307.2 GB/s, though both use DDR5 with an eight-channel memory bus. ECC memory support is present on both. PCIe connectivity differs, with the 6745P providing Gen 5 with 88 lanes (CPU only) and the w9-3575X offering Gen 5 with 112 lanes (CPU only). The w9-3575X has an unlocked multiplier; the 6745P does not. The w9-3575X was released on 2024-08-23, while the 6745P followed on 2025-02-23.

Where Each One Wins

The Intel Xeon 6745P is the clear choice for data-centric and integer-heavy workloads. Its 13% lead in integer math and 10.9% lead in data compression point to strengths in database operations, financial modeling, and general server-side processing that relies on large data sets. The 7.1% encryption advantage also suggests it handles secure transactions and cryptographic workloads more efficiently. The massive 336 MB L3 cache is likely a key factor, reducing memory latency for repeated data access patterns.

The Intel Xeon w9-3575X wins in physics simulations and single-threaded tasks. The 10.1% physics benchmark lead is substantial, indicating better performance in scientific computing, engineering simulations, and any workload that relies heavily on floating-point calculations. Its 6% single-thread advantage makes it more responsive for interactive workstation use, legacy applications that don't scale across cores, and tasks where raw per-core speed matters. The w9-3575X also holds edges in extended instructions, prime number finding, and random string sorting, though these are narrower margins.

For mixed workloads, the 6745P's multi-thread benchmark win (1% in PassMark and Cinebench) suggests it scales better with parallel tasks despite having fewer cores. The w9-3575X does win in floating-point math, which could tip the balance for 3D rendering or computational fluid dynamics, but the 6745P's overall average score is 7.3% higher across all benchmarks.

Specification Differences

| Specification | Intel Xeon 6745P | Intel Xeon w9-3575X |

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

| Cores | 32 | 44 |

| Threads | 64 | 88 |

| Base Clock | 3.10 GHz | 2.20 GHz |

| Boost Clock | 4.30 GHz | 4.80 GHz |

| TDP | 300 W | 340 W |

| Socket | Intel Socket 4710 | Intel Socket 4677 |

| Architecture | Granite Rapids | Sapphire Rapids |

| Process Node | 5 nm | 10 nm |

| Die Size | 2x 598 mm² | 4x 477 mm² |

| L1 Cache | 112 KB (per core) | 80 KB (per core) |

| L3 Cache | 336 MB (shared) | 97.5 MB |

| Memory Bandwidth | 409.6 GB/s | 307.2 GB/s |

| PCIe | Gen 5, 88 Lanes | Gen 5, 112 Lanes |

| Multiplier | Locked | Unlocked |

| Release Date | 2025-02-23 | 2024-08-23 |

| Launch MSRP | $5250 | $3789 |

FAQ

Q: Which processor has more cores and threads?

A: The Intel Xeon w9-3575X has 44 cores and 88 threads, compared to the Intel Xeon 6745P's 32 cores and 64 threads.

Q: Does the Intel Xeon 6745P beat the w9-3575X in multi-core Cinebench tests?

A: Yes, the 6745P wins all three Cinebench multi-core tests by 1% each: 7,214 vs 7,140 in R15, 30,062 vs 29,751 in R20, and 71,578 vs 70,837 in R23.

Q: What is the biggest benchmark margin between the two?

A: The largest gap is in PassMark integer math, where the Intel Xeon 6745P leads by 13% with 336,926 versus 298,224. The second-largest is PassMark physics, where the w9-3575X leads by 10.1% with 6,836 versus 6,144.

Q: Which processor has a higher boost clock?

A: The Intel Xeon w9-3575X boosts to 4.80 GHz, while the Intel Xeon 6745P boosts to 4.30 GHz.

Q: How do their L3 cache sizes compare?

A: The Intel Xeon 6745P has 336 MB of shared L3 cache, while the Intel Xeon w9-3575X has 97.5 MB. This is a difference of over 238 MB.

Q: Which processor supports more PCIe lanes?

A: The Intel Xeon w9-3575X supports 112 PCIe Gen 5 lanes (CPU only), whereas the Intel Xeon 6745P supports 88 PCIe Gen 5 lanes (CPU only).

The Verdict

The data directs a clear split: pick the Intel Xeon 6745P for data-heavy server workloads, and the Intel Xeon w9-3575X for single-threaded or physics-dominated tasks. The 6745P wins 9 of 16 benchmarks, including all Cinebench tests and the high-margin integer math and data compression tests. Its 336 MB L3 cache and 409.6 GB/s memory bandwidth make it the superior choice for databases, encryption, and multi-threaded enterprise applications. The w9-3575X, despite fewer benchmark wins, offers a 6% single-thread advantage and a 10.1% physics edge, which matters for simulation and floating-point work. The w9-3575X also has 12 more cores and an unlocked multiplier, which could appeal to overclockers, but its 97.5 MB L3 cache and lower memory bandwidth limit its ceiling in cache-sensitive tasks. The 6745P's higher average benchmark score (154,858 vs 144,323) and 98th percentile standing in both cases make it the more balanced performer, but the w9-3575X is the answer if per-core speed or physics simulation is your priority.