Intel Core Ultra 5 250K Plus vs Intel Xeon 6515P Comparison

The Intel Xeon 6515P and Intel Core Ultra 5 250K Plus are two Intel processors that land in the same performance neighborhood despite serving entirely different markets. The Xeon 6515P is a Granite Rapids server/workstation part with 16 cores and 32 threads, while the Core Ultra 5 250K Plus is an Arrow Lake Refresh desktop chip with 18 cores and 18 threads. Their average benchmark scores are nearly identical—67006 for the Xeon versus 66855 for the Ultra 5—putting them within 0.2% of each other. That statistical tie masks a fascinating split: the Xeon wins 7 of 17 head-to-head tests, the Ultra 5 wins 10, yet the nature of those wins tells a clear story about which chip belongs in which machine.

The Verdict

The data paints a clear picture for buyers. The Intel Xeon 6515P is the choice for workloads that demand massive single-thread throughput, heavy integer math, and extended instruction set performance. Its Cinebench R23 single-core score of 5442 absolutely demolishes the Ultra 5's 2261, a 140.7% advantage that no desktop chip in this comparison can touch. The Xeon also leads in Cinebench R23 multi-core (38547 vs 30867, a 24.9% edge), PassMark integer math (147047 vs 125091, up 17.6%), and PassMark extended instructions (53383 vs 44565, up 19.8%). For server-style workloads—compression, instruction-heavy code, physics calculations—the Xeon is the data-backed winner.

The Intel Core Ultra 5 250K Plus wins the more consumer-facing tests. It takes PassMark single-thread by a massive margin (4757 vs 2855, a 40% lead), dominates floating-point math (162692 vs 128954, up 20.7%), and crushes encryption workloads (42144 vs 30476, up 27.7%). Its 18 cores at a 5.30 GHz boost clock deliver better results in Cinebench R15 and R20 multi-core tests, plus PassMark multithread (51596 vs 45350, up 12.1%). If you are building a desktop for mixed use, gaming, or content creation that leverages floating-point and encryption, the Ultra 5 is the data-driven pick. The Xeon is for servers and workstations where its 72 MB of L3 cache and eight-channel memory bandwidth matter more than raw clock speed.

Architecture Differences

The two chips come from fundamentally different design philosophies. The Xeon 6515P is built on Granite Rapids architecture at Intel's 5 nm process node, while the Ultra 5 250K Plus uses Arrow Lake Refresh on TSMC's 3 nm process. The Xeon packs 16 cores with 32 threads via Hyper-Threading, whereas the Ultra 5 has 18 cores but only 18 threads—no simultaneous multithreading. That thread disparity explains why the Xeon's Cinebench R23 multi-core score is higher despite fewer physical cores; each Xeon core can process two threads simultaneously.

Cache hierarchies diverge sharply. The Xeon allocates 112 KB of L1 and 2 MB of L2 per core, plus a massive 72 MB of shared L3. The Ultra 5 counters with 192 KB L1 and 3 MB L2 per core, but only 30 MB of shared L3. The Xeon's larger L3 cache is clearly aimed at server workloads with large working sets. Memory architecture reinforces this: the Xeon supports eight-channel DDR5 with 409.6 GB/s bandwidth, while the Ultra 5 is dual-channel with 115.2 GB/s. Both support ECC memory, but the Xeon's memory subsystem is in a different league entirely.

PCIe connectivity also separates them. The Xeon offers Gen 5 with 88 lanes (CPU only), while the Ultra 5 provides Gen 5 with 20 lanes. The Xeon has no integrated graphics; the Ultra 5 includes Arc Xe-LPG Graphics 64EU. The Xeon uses Socket 4710, the Ultra 5 uses Socket 1851. The Xeon's multiplier is locked, while the Ultra 5's is unlocked. Their release dates differ by over a year: the Xeon launched on 2025-02-23, the Ultra 5 on 2026-03-10.

Head-to-Head Benchmarks

The single biggest win for the Xeon is Cinebench R23 single-core, where it scores 5442 versus the Ultra 5's 2261—a 140.7% advantage. This is not a small edge; it is a generational gap in single-thread rendering performance. The Xeon also wins Cinebench R23 multi-core (38547 vs 30867, up 24.9%), proving that its 32 threads overcome the Ultra 5's higher clock speeds in sustained multi-threaded rendering. In Cinebench R15 single-core, the Xeon leads 548 vs 328, a 67.1% margin—though both scores are low in absolute terms, suggesting legacy test limitations.

The Ultra 5's biggest victory is PassMark single-thread, where it scores 4757 versus the Xeon's 2855, a 40% lead. It also wins Cinebench R20 multi-core (18442 vs 16189, up 12.2%) and Cinebench R20 single-core (2603 vs 2285, up 12.2%). In PassMark, the Ultra 5 takes data encryption (42144 vs 30476, up 27.7%), floating-point math (162692 vs 128954, up 20.7%), find prime numbers (486 vs 385, up 20.8%), multithread (51596 vs 45350, up 12.1%), and random string sorting (69090 vs 64425, up 6.8%).

The Xeon's other wins include data compression (592645 vs 568721, up 4.2%), extended instructions (53383 vs 44565, up 19.8%), integer math (147047 vs 125091, up 17.6%), and physics (3829 vs 3494, up 9.6%). The head-to-head record is 10-7 in favor of the Ultra 5, but the Xeon's wins are in heavier, more server-relevant workloads.

Specification Differences

The two processors differ on nearly every core specification. The Xeon has 16 cores and 32 threads; the Ultra 5 has 18 cores and 18 threads. Base clocks are 2.30 GHz for the Xeon versus 4.20 GHz for the Ultra 5. Boost clocks are 3.80 GHz versus 5.30 GHz, respectively. TDP differs significantly: the Xeon draws 150 watts, the Ultra 5 draws 125 watts.

Cache configurations are starkly different: the Xeon has 112 KB L1 and 2 MB L2 per core with 72 MB shared L3; the Ultra 5 has 192 KB L1 and 3 MB L2 per core with 30 MB shared L3. Memory bus width differs—eight-channel for the Xeon versus dual-channel for the Ultra 5—resulting in 409.6 GB/s versus 115.2 GB/s memory bandwidth. PCIe lanes are 88 versus 20, both Gen 5. The Ultra 5 has integrated Arc Xe-LPG Graphics 64EU; the Xeon has none. The Ultra 5's multiplier is unlocked; the Xeon's is locked. Process nodes differ: 5 nm (Intel) versus 3 nm (TSMC). The Ultra 5 lists 17,800 million transistors on a 243 mm² die; the Xeon lists no transistor or die size data.

FAQ

Q: Which processor has better single-thread performance?

A: The Intel Core Ultra 5 250K Plus wins PassMark single-thread by 40% (4757 vs 2855). However, the Xeon 6515P dominates Cinebench R23 single-core by 140.7% (5442 vs 2261), suggesting the Xeon's single-thread advantage depends heavily on the benchmark methodology.

Q: How do they compare in multi-threaded rendering?

A: The Xeon wins Cinebench R23 multi-core with 38547 vs 30867 (up 24.9%), but the Ultra 5 wins Cinebench R15 multi-core (4640 vs 3885, up 16.3%) and Cinebench R20 multi-core (18442 vs 16189, up 12.2%). The Xeon's 32 threads give it an edge in newer, longer-running render tests.

Q: Which chip handles encryption better?

A: The Ultra 5 250K Plus wins PassMark data encryption decisively: 42144 vs 30476, a 27.7% advantage. This suggests the Ultra 5's architecture is better optimized for cryptographic workloads despite the Xeon's server pedigree.

Q: Is the Xeon worth its launch MSRP of $740?

A: The Xeon's launch MSRP is $740, versus $199 for the Ultra 5. The performance data shows the Xeon leads in integer math (17.6%), extended instructions (19.8%), and Cinebench R23 multi-core (24.9%), but the Ultra 5 leads in more consumer-facing tasks like floating-point math (20.7%) and single-thread PassMark (40%).

Q: Do both chips support ECC memory?

A: Yes, both the Xeon 6515P and the Core Ultra 5 250K Plus support ECC memory. However, the Xeon's eight-channel memory bus with 409.6 GB/s bandwidth vastly exceeds the Ultra 5's dual-channel 115.2 GB/s configuration.

Q: Which chip has more cache?

A: The Xeon has 72 MB of shared L3 cache versus the Ultra 5's 30 MB. Per-core L1 and L2 caches are larger on the Ultra 5 (192 KB and 3 MB per core) compared to the Xeon (112 KB and 2 MB per core), but the Xeon's massive L3 is more suited to server workloads.

Where Each One Wins

The Intel Xeon 6515P wins in scenarios that stress memory bandwidth, large caches, and high thread counts. Its Cinebench R23 multi-core lead (24.9%) and massive single-core R23 advantage (140.7%) make it the pick for rendering farms, scientific computing, and any workload that scales with 32 threads. The 72 MB L3 cache and eight-channel 409.6 GB/s memory bandwidth give it a clear edge in data compression (4.2% lead), integer math (17.6%), extended instructions (19.8%), and physics calculations (9.6%). Server administrators and workstation users running VMs, databases, or heavy batch processing will see the data favor the Xeon.

The Intel Core Ultra 5 250K Plus wins in desktop-centric workloads. Its 40% PassMark single-thread lead and 20.7% floating-point advantage make it better for gaming, media encoding, and real-time simulation. The encryption lead (27.7%) is notable for anyone handling secure communications or VPN traffic. The Ultra 5's higher boost clock (5.30 GHz vs 3.80 GHz) and unlocked multiplier allow for overclocking headroom that the locked Xeon cannot offer. It also wins in random string sorting (6.8%), find prime numbers (20.8%), and PassMark multithread (12.1%), making it a versatile desktop processor for mixed productivity workloads.

The average benchmark scores are within 0.2% of each other, and both sit at the 93rd percentile of all CPUs. The choice is not about raw capability—it is about which specific workloads you prioritize. The Xeon is the data-backed server champion; the Ultra 5 is the desktop workhorse. Their nearest rivals confirm the split: the Xeon sits between the AMD EPYC 4465P (0.1% ahead) and the Intel Core Ultra 9 275HX (0.7% behind), while the Ultra 5 trails the same EPYC by 0.1% and leads the Core Ultra 5 250KF Plus by 1.1%. Both are mid-pack performers in a crowded field, but they serve completely different masters.