Intel Core Ultra 7 265K vs Intel Xeon 6511P Comparison

The Intel Xeon 6511P and Intel Core Ultra 7 265K occupy opposite ends of Intel’s performance spectrum, yet their average benchmark scores are nearly identical. The Xeon 6511P posts an average score of 71,051, while the Core Ultra 7 265K trails by a mere 0.2% at 70,879. Both processors rank in the 94th percentile against all CPUs, making them statistical peers in overall performance despite radically different designs. The data reveals a fascinating split: the server-grade Xeon dominates in specific heavy workloads, while the desktop chip wins the majority of individual tests, claiming 13 of 17 head-to-head matchups.

Head-to-Head Benchmarks

The Core Ultra 7 265K establishes its dominance early in the Cinebench suite. In Cinebench R15 multi-core, it scores 5,020 against the Xeon’s 4,152, a 17.3% lead. The single-core R15 result follows the same pattern: 708 versus 586, another 17.2% advantage. Cinebench R20 shows identical margins—the Ultra 7 wins multi-core with 20,918 against 17,302 (17.3% ahead) and single-core with 2,953 versus 2,442 (17.3% ahead). These early results suggest a clear generational advantage for the newer desktop architecture.

The Xeon 6511P strikes back decisively in Cinebench R23. Its multi-core score of 41,196 beats the Ultra 7’s 35,850 by 14.9%. More striking is the R23 single-core result: the Xeon scores 5,815 against the Ultra 7’s 2,020, a staggering 187.9% difference. This anomaly likely reflects different testing conditions for the desktop chip, but the raw data shows the Xeon as the clear winner in this specific benchmark.

PassMark results paint a more nuanced picture. The Ultra 7 wins data compression with 665,554 versus 640,808 (3.7% ahead) and data encryption with 48,246 versus 31,429 (34.9% ahead). Extended instructions favor the Ultra 7 at 54,333 versus 50,730 (6.6% ahead), while find prime numbers shows a 37.3% Ultra 7 advantage (491 versus 308). Floating-point math swings heavily toward the desktop chip: 189,629 versus 127,307, a 32.9% margin. The Ultra 7 also wins multithread (58,594 versus 45,687, 22% ahead), random string sorting (79,752 versus 67,809, 15% ahead), and single-thread performance (4,928 versus 2,545, 48.4% ahead).

The Xeon’s remaining wins come in integer math and physics. The Xeon scores 162,524 in integer math versus 143,242 for the Ultra 7, a 13.5% advantage. In physics, the Xeon posts 4,678 against 3,731, winning by 25.4%. These four victories (including Cinebench R23) highlight the server chip’s strength in specific computational patterns, even as the desktop processor wins on sheer breadth.

Architecture Differences

The fundamental split begins with process node and foundry. The Xeon 6511P uses Intel’s 5 nm process, while the Core Ultra 7 265K is built on TSMC’s 3 nm node. The Ultra 7’s smaller node enables higher clock speeds and better transistor density, with 17,800 million transistors packed into a 243 mm² die. The Xeon’s transistor count and die size are not listed, but its architecture tells a different story.

Granite Rapids powers the Xeon 6511P, a server-focused design with 16 cores and 32 threads. The Arrow Lake architecture in the Ultra 7 265K offers 20 cores but only 20 threads, indicating no hyperthreading on the desktop part. The Xeon compensates with massive cache: 72 MB of shared L3 cache versus 30 MB on the Ultra 7. Per-core cache also differs—the Xeon has 112 KB L1 and 2 MB L2 per core, while the Ultra 7 has 192 KB L1 and 3 MB L2 per core. The Ultra 7’s larger per-core caches help its single-thread performance, while the Xeon’s huge shared L3 benefits multi-threaded server workloads.

Memory architecture diverges sharply. The Xeon supports eight-channel DDR5 with 409.6 GB/s bandwidth, versus dual-channel DDR5 at 102.4 GB/s for the Ultra 7. Both support ECC memory. PCIe lanes tell a similar story: the Xeon offers 136 Gen 5 lanes (CPU only), while the Ultra 7 provides 20 Gen 5 lanes. The Ultra 7 includes integrated Arc Xe-LPG Graphics 64EU; the Xeon has no integrated graphics.

Where Each One Wins

The Core Ultra 7 265K is the choice for encryption-heavy workloads. Its 34.9% lead in data encryption and 32.9% advantage in floating-point math make it ideal for cryptography, scientific simulations, and any task leveraging SIMD instructions. The 48.4% single-thread advantage and 37.3% lead in prime number finding indicate superior responsiveness for everyday applications and single-threaded legacy software. Data compression also favors the Ultra 7, making it strong for file archiving and database workloads that compress on the fly.

The Xeon 6511P wins where memory bandwidth and raw integer throughput matter. Its 13.5% lead in integer math suggests strength in database indexing, transaction processing, and general server logic. The 25.4% physics advantage points to better performance in physics simulation engines and collision detection. The massive 187.9% Cinebench R23 single-core margin, while anomalous, suggests the Xeon can sustain high single-thread bursts when needed. The eight-channel memory system and 409.6 GB/s bandwidth make it suited for memory-bound virtualization and large in-memory databases, even though the benchmark data doesn’t directly measure these scenarios.

Specification Differences

The Core Ultra 7 265K runs at a 3.90 GHz base clock and 5.50 GHz boost, compared to the Xeon’s 2.30 GHz base and 4.20 GHz boost. The Ultra 7 has a 125 W TDP versus 150 W for the Xeon. Sockets differ completely: Intel Socket 1851 for the Ultra 7, Intel Socket 4710 for the Xeon. The Ultra 7 uses an unlocked multiplier; the Xeon is locked. Release dates differ by four months—the Ultra 7 launched on 2024-10-23, the Xeon on 2025-02-23. The Ultra 7’s launch MSRP is $394; the Xeon’s is $815. Part numbers are SRQCW for the Ultra 7 and SRVU9 for the Xeon. The Ultra 7 belongs to the Core Ultra Series 2 with Arrow Lake-S codename; the Xeon is part of Xeon 6 (Granite Rapids-SP). Market segments are Desktop versus Server/Workstation respectively.

FAQ

Q: Which processor has a higher average benchmark score?

A: The Intel Xeon 6511P has an average score of 71,051, which is 0.2% higher than the Core Ultra 7 265K’s 70,879.

Q: How many cores and threads does each CPU offer?

A: The Xeon 6511P has 16 cores and 32 threads, while the Core Ultra 7 265K has 20 cores and 20 threads.

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

A: The Xeon 6511P wins Cinebench R23 single-core by 187.9%, scoring 5,815 versus the Ultra 7’s 2,020.

Q: Which CPU has more PCIe lanes?

A: The Xeon 6511P provides 136 Gen 5 lanes (CPU only), compared to 20 Gen 5 lanes for the Core Ultra 7 265K.

Q: Does the Core Ultra 7 265K have integrated graphics?

A: Yes, it includes Arc Xe-LPG Graphics 64EU. The Xeon 6511P has no integrated graphics.

Q: Which processor has a higher boost clock?

A: The Core Ultra 7 265K boosts to 5.50 GHz, well above the Xeon 6511P’s 4.20 GHz maximum.