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

The Intel Xeon 6515P and the Intel Core Ultra 5 250KF Plus represent two distinct philosophies from the same manufacturer: one is a server/workstation behemoth built for memory bandwidth and specific instruction sets, while the other is a high-frequency desktop part designed for raw speed. The benchmark data reveals a surprisingly lopsided contest in terms of sheer win count, but a closer look at the individual workloads shows a more nuanced picture than the 13-to-4 scoreboard suggests.

Head-to-Head Benchmarks

The Core Ultra 5 250KF Plus dominates the Cinebench suite, posting a consistent ~9.8% lead across every rendering workload. In Cinebench R23 multi-core, it scores 42,718 against the Xeon’s 38,547, and in single-core, it hits 6,030 versus 5,442. This pattern repeats in R15 and R20, where the deltas are nearly identical at -9.7% and -9.8%, respectively. The data implies that the Ultra 5’s higher 5.30 GHz boost clock and 3nm process give it a decisive advantage in lightly-threaded and fully-threaded rendering tasks alike.

The single-threaded gap is even more dramatic. In PassMark single-thread, the Ultra 5 scores 4,698, which is 39.2% higher than the Xeon’s 2,855. That is the largest delta in the entire comparison, and it underscores how far ahead the desktop part is in raw per-core throughput. The Xeon’s 2.30 GHz base clock and 3.80 GHz boost simply cannot compete with the Ultra 5’s 4.20 GHz base and 5.30 GHz boost.

However, the Xeon fights back in specific server-oriented workloads. It wins data compression with a score of 592,645, beating the Ultra 5’s 553,155 by 7.1%. It also crushes the Ultra 5 in extended instructions (53,383 vs 42,880, a 24.5% lead) and integer math (147,047 vs 123,030, a 19.5% advantage). The Xeon’s 72 MB of shared L3 cache and eight-channel memory bus likely fuel these wins, as they favor large datasets and memory-intensive operations.

The Xeon also takes physics (3,829 vs 3,183, a 20.3% lead), a surprising result given the Ultra 5’s higher clock speeds. This suggests the Xeon’s 16 cores with 32 threads handle certain floating-point physics simulations more efficiently than the Ultra 5’s 18 cores with 18 threads. The Ultra 5’s lack of hyperthreading appears to be a real liability here.

Conversely, the Ultra 5 wins data encryption by a staggering 26.2% (41,292 vs 30,476), floating-point math by 19.3% (159,824 vs 128,954), and prime number finding by 14.8% (452 vs 385). It also edges out the Xeon in multithread (50,146 vs 45,350, a 9.6% lead) and random string sorting (67,209 vs 64,425, a 4.1% lead). The encryption delta is particularly notable, as it suggests the Ultra 5’s newer architecture has significantly better cryptographic acceleration.

FAQ

Q: Which processor has a higher average benchmark score?

A: The Xeon 6515P has an average benchmark score of 67,006, while the Core Ultra 5 250KF Plus scores 66,159. The Xeon is 0.2% ahead of the Ultra 5, and the Ultra 5 is 1.1% behind the AMD EPYC 4465P, which scores 66,925.

Q: How do the two compare in Cinebench R23 multi-core?

A: The Core Ultra 5 250KF Plus wins, scoring 42,718 against the Xeon’s 38,547. This is a 9.8% advantage for the Ultra 5, which is consistent with its performance in R15 and R20 multi-core tests.

Q: Does the Xeon have any significant wins in the PassMark suite?

A: Yes, the Xeon wins data compression (592,645 vs 553,155, a 7.1% lead), extended instructions (53,383 vs 42,880, a 24.5% lead), integer math (147,047 vs 123,030, a 19.5% lead), and physics (3,829 vs 3,183, a 20.3% lead).

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

A: The largest delta is in PassMark single-thread, where the Ultra 5 scores 4,698 against the Xeon’s 2,855. That is a 39.2% difference, which is more than double the next largest gap (data encryption at 26.2%).

Q: Which processor has more cores and threads?

A: The Xeon has 16 cores and 32 threads, while the Ultra 5 has 18 cores and 18 threads. The Xeon uses hyperthreading to double its thread count, while the Ultra 5 does not.

Q: Are these processors in the same market segment?

A: No. The Xeon is a Server/Workstation part, while the Ultra 5 is a Desktop part. This is reflected in their sockets: the Xeon uses Intel Socket 4710, and the Ultra 5 uses Intel Socket 1851.

Architecture Differences

The architectural divide is stark. The Xeon 6515P is built on Granite Rapids, a 5nm process from Intel’s own foundry, targeting the Xeon 6 (Granite Rapids-SP) generation. The Ultra 5 250KF Plus uses Arrow Lake Refresh, a 3nm process from TSMC, and belongs to the Core Ultra Series 2 (Ultra 5, Arrow Lake) generation. This process difference is critical: the smaller 3nm node allows the Ultra 5 to hit higher clocks at a lower TDP.

The Xeon’s cache hierarchy is designed for massive data sets. It has 112 KB of L1 per core, 2 MB of L2 per core, and a massive 72 MB of shared L3. The Ultra 5 counters with 192 KB of L1 per core, 3 MB of L2 per core, and only 30 MB of shared L3. The Xeon’s L3 is more than double the Ultra 5’s, which explains its dominance in integer math and extended instructions.

Memory support is another clear divide. Both support DDR5, but the Xeon uses an eight-channel memory bus, yielding a memory bandwidth of 409.6 GB/s. The Ultra 5 is limited to dual-channel, providing 115.2 GB/s. That is a 3.5x difference in theoretical memory bandwidth, and it directly fuels the Xeon’s wins in data compression and physics.

Both have ECC memory support, but the Xeon’s PCIe configuration is far more expansive: 88 Gen 5 lanes versus the Ultra 5’s 20 Gen 5 lanes. Neither has integrated graphics. The Xeon is a server part with a 150W TDP, while the Ultra 5 is a desktop part at 125W. The Xeon’s TDP is higher, but its base clock is much lower, suggesting it is tuned for sustained all-core loads rather than bursty single-thread performance.

Specification Differences

The two processors diverge on nearly every specification. The Xeon has 16 cores and 32 threads, while the Ultra 5 has 18 cores and 18 threads. The Xeon’s base clock is 2.30 GHz, and its boost is 3.80 GHz. The Ultra 5 runs at 4.20 GHz base and 5.30 GHz boost, which are dramatically higher.

The cache differs sharply: the Xeon has 112 KB L1 per core, 2 MB L2 per core, and 72 MB shared L3. The Ultra 5 has 192 KB L1 per core, 3 MB L2 per core, and 30 MB shared L3. The Xeon’s L3 is 42 MB larger.

The memory bus is eight-channel on the Xeon versus dual-channel on the Ultra 5, yielding bandwidth of 409.6 GB/s versus 115.2 GB/s. PCIe lanes are 88 on the Xeon versus 20 on the Ultra 5. The Xeon uses Intel Socket 4710, has a TDP of 150W, and is not multiplier unlocked. The Ultra 5 uses Intel Socket 1851, has a TDP of 125W, and is multiplier unlocked. The Xeon is manufactured on a 5nm process by Intel, while the Ultra 5 uses a 3nm process by TSMC. The Ultra 5 also has a transistor count of 17,800 million and a die size of 243 mm², while the Xeon has no listed transistor or die size data.

The Verdict

The data is clear: the Core Ultra 5 250KF Plus is the faster processor in the vast majority of workloads. It wins 13 of 17 head-to-head benchmarks, including every Cinebench test, all single-thread tests, and key PassMark workloads like encryption, floating-point math, and multithread. Its single-thread lead of 39.2% is enormous, and its rendering lead of ~9.8% across the board makes it the obvious choice for general computing, content creation, and any workload that benefits from high clock speeds.

The Xeon 6515P is not a general-purpose winner. Its 4 wins are concentrated in server-specific areas: data compression (7.1% lead), extended instructions (24.5% lead), integer math (19.5% lead), and physics (20.3% lead). These are workloads that rely on massive L3 cache, high memory bandwidth, and high thread counts. The Xeon’s 72 MB L3 and 409.6 GB/s memory bandwidth are tailor-made for these tasks, and the data reflects that.

The average benchmark scores tell a similar story: the Xeon edges out the Ultra 5 by 0.2% (67,006 vs 66,159), but this is driven by its dominance in memory-bound server tasks. The Ultra 5’s nearest rival is the Intel Core Ultra 5 250K Plus (66,855, a -1% delta), while the Xeon’s nearest rival is the AMD EPYC 4465P (66,925, a 0.1% delta). Both sit at the 93rd percentile of all CPUs, meaning they are both top-tier parts, but they excel in different domains.

Where Each One Wins

The Core Ultra 5 250KF Plus is the winner for anyone who prioritizes raw speed. It wins every Cinebench test, making it ideal for 3D rendering, video encoding, and other multi-threaded creative workloads. Its 39.2% single-thread lead makes it the better choice for everyday desktop use, gaming, and any application that relies on per-core performance. The 26.2% lead in encryption also makes it a strong contender for security-focused tasks. Its 18 cores and 18 threads are sufficient for most modern workloads, and its unlocked multiplier allows for overclocking to push performance even higher.

The Xeon 6515P is the winner for server and workstation environments where memory bandwidth is king. Its 24.5% lead in extended instructions makes it the better choice for scientific computing, simulations, and any workload that uses AVX-512 or similar instruction sets. The 19.5% lead in integer math and 7.1% lead in data compression make it a natural fit for database workloads, file servers, and data analytics. Its 20.3% lead in physics is useful for certain engineering simulations. The 32 threads and 409.6 GB/s memory bandwidth are essential for heavily virtualized environments or in-memory databases, where the Ultra 5’s dual-channel memory would be a bottleneck. The Xeon’s 88 PCIe lanes also make it the superior choice for systems with multiple GPUs, NVMe drives, or high-speed networking cards.

In short, the Ultra 5 is the better all-around processor for desktop users, while the Xeon is the specialized tool for memory-hungry server applications. The benchmark data does not lie: pick the Ultra 5 for speed, pick the Xeon for bandwidth.