Intel Core Ultra 5 245K vs Intel Xeon 634 Comparison

The Intel Core Ultra 5 245K and the Intel Xeon 634 represent two divergent philosophies in Intel's current lineup: one is a desktop-focused Arrow Lake chip built on a 3 nm process, the other a Granite Rapids workstation/server part on Intel's 5 nm node. The benchmark data shows a clear split: the Core Ultra 5 245K dominates in most individual workloads, winning 11 of 17 head-to-head tests, while the Xeon 634 counters with significant wins in multi-core rendering and specific server-oriented tasks. This is not a simple "one is faster" story; it is a tale of architectural priorities, with each processor claiming territory based on workload type.

Where Each One Wins

The Core Ultra 5 245K is the general-purpose champion, taking decisive victories in single-threaded and math-heavy workloads. Its PassMark single-thread score of 4714 is 32.2% higher than the Xeon's 3567, and it leads by 14.5% in Cinebench R20 single-core (2169 vs 1894). The gap widens further in floating-point math, where the Ultra 5 scores 130678 versus 93564, a 39.7% advantage. This pattern extends to integer-heavy tasks like prime number finding, where the Ultra 5's 414 score is more than double the Xeon's 196, a staggering 111.2% delta. Encryption also favors the Ultra 5 decisively: 33286 vs 23451, a 41.9% edge. These results point to a processor optimized for responsive, bursty desktop workloads where per-core strength matters most.

The Xeon 634, conversely, wins where raw throughput or specialized instruction sets are required. Its most dramatic victory comes in Cinebench R23 multi-core, scoring 31950 against the Ultra 5's 25066, a 21.5% lead. It also wins in integer math (117664 vs 98524, a 16.3% margin) and data compression (477924 vs 458817, a 4% edge). Notably, the Xeon takes Cinebench R15 single-core with a 454 score against the Ultra 5's 322, a 29.1% swing in its favor—an outlier that suggests different microarchitectural behavior under that specific benchmark's legacy load. For data compression and extended instructions (38320 vs 37617, a 1.8% win), the Xeon's 48 MB of shared L3 cache and 24 threads give it breathing room that the Ultra 5, with only 14 threads and 24 MB L3, cannot match.

Architecture Differences

The fundamental split begins with the process node: the Core Ultra 5 245K is built on TSMC's 3 nm process with 17,800 million transistors on a 243 mm² die, while the Xeon 634 uses Intel's 5 nm process with a much larger 598 mm² die. This explains the power envelope—the Ultra 5's 125 W TDP versus the Xeon's 150 W TDP—and the clock speed disparity: the Ultra 5 boosts to 5.20 GHz versus the Xeon's 4.60 GHz, with base clocks of 4.20 GHz and 2.70 GHz respectively. The Ultra 5 compensates for its smaller die with higher clocks and a 14-core/14-thread configuration (no hyperthreading), while the Xeon packs 12 cores but 24 threads, using simultaneous multithreading to extract more parallelism from each physical core.

Cache hierarchies differ substantially. The Ultra 5 offers 192 KB L1 and 3 MB L2 per core, with 24 MB shared L3. The Xeon counters with 112 KB L1 and 2 MB L2 per core, but doubles the shared L3 to 48 MB. This larger L3 is critical for the Xeon's wins in data compression and extended instructions, where working sets exceed what the Ultra 5's smaller cache can hold. Memory bandwidth further separates them: the Xeon runs quad-channel DDR5 delivering 204.8 GB/s, exactly double the Ultra 5's dual-channel 102.4 GB/s. Both support ECC memory, but the Xeon's 80 PCIe Gen 5 lanes (versus 20 on the Ultra 5) mark it as a platform designed for heavy I/O expansion, not just raw compute.

The Ultra 5 includes integrated Arc Xe-LPG Graphics with 64 execution units, while the Xeon has no integrated graphics—a clear indicator of intended use cases. The Ultra 5 is a desktop part on Socket 1851, released in October 2024 with a launch MSRP of $319, while the Xeon 634 targets server/workstation on Socket 4710 with a February 2026 release and $499 launch MSRP. Both are actively produced and have unlocked multipliers, but the Xeon's 91st percentile ranking among all CPUs matches the Ultra 5's 91st percentile, despite their very different benchmark profiles. The average benchmark scores tell the story: the Ultra 5 averages 54053 (0.7% ahead of the Intel Xeon 6505P), while the Xeon 634 averages 52974 (0.1% behind the AMD Ryzen AI Embedded P164).

The Verdict

For desktop users, the data is unambiguous: the Core Ultra 5 245K is the superior choice. It wins in 11 of 17 head-to-head tests, including all PassMark single-thread variants, floating-point math, encryption, prime number generation, physics, and random string sorting. Its 14.5% lead in Cinebench R20 multi-core (15368 vs 13419) and 14.5% edge in PassMark multithread (43047 vs 37589) show that even in parallel workloads, the Ultra 5's higher clocks and modern process node often overcome the Xeon's thread count advantage. The Xeon's 21.5% win in Cinebench R23 multi-core is real, but it comes at the cost of higher TDP and a much larger, more expensive platform.

The Xeon 634 makes sense only for specific server or workstation scenarios where its 204.8 GB/s quad-channel memory bandwidth, 80 PCIe lanes, and 48 MB L3 cache are non-negotiable. Its wins in integer math (16.3% ahead), data compression (4% ahead), and extended instructions (1.8% ahead) are exactly the workloads that benefit from massive cache and memory throughput. The Xeon's 454 score in Cinebench R15 single-core, a 29.1% victory over the Ultra 5's 322, hints at a microarchitecture tuned for sustained server loads rather than bursty desktop tasks. If your work involves large datasets, heavy I/O, or legacy single-threaded server applications, the Xeon 634's 150 W TDP is a justifiable trade-off. For everything else, the Ultra 5 is faster, cooler, and more responsive.

FAQ

Q: Which processor has higher single-thread performance?

A: The Core Ultra 5 245K wins PassMark single-thread with 4714 against the Xeon's 3567, a 32.2% margin. However, in Cinebench R15 single-core, the Xeon 634 scores 454 versus 322, a 29.1% lead.

Q: Does the Xeon 634 always beat the Ultra 5 in multi-core?

A: No. The Xeon wins Cinebench R23 multi-core (31950 vs 25066, 21.5% ahead) but loses Cinebench R20 multi-core (13419 vs 15368, 14.5% behind) and PassMark multithread (37589 vs 43047, 14.5% behind).

Q: What is the memory bandwidth difference?

A: The Xeon 634 supports quad-channel DDR5 with 204.8 GB/s bandwidth, exactly double the Core Ultra 5 245K's dual-channel 102.4 GB/s.

Q: Which CPU has more L3 cache?

A: The Xeon 634 has 48 MB of shared L3 cache, while the Core Ultra 5 245K has 24 MB. The Xeon also has 2 MB L2 per core versus 3 MB on the Ultra 5.

Q: Do both support ECC memory?

A: Yes, both the Intel Core Ultra 5 245K and the Intel Xeon 634 support ECC memory. The Xeon also offers quad-channel support versus dual-channel on the Ultra 5.

Q: Which CPU is better for encryption workloads?

A: The Core Ultra 5 245K is dramatically better, scoring 33286 in PassMark data encryption versus 23451 on the Xeon 634, a 41.9% advantage.

Head-to-Head Benchmarks

The largest single win belongs to the Core Ultra 5 245K in PassMark find prime numbers, where it scores 414 against the Xeon's 196—a 111.2% delta that shows the Ultra 5's per-core integer pipeline is vastly more efficient. The second-biggest win is also the Ultra 5's: data encryption at 41.9% ahead (33286 vs 23451), followed by floating-point math at 39.7% (130678 vs 93564). These three wins alone demonstrate a processor that simply executes scalar and floating-point code faster than a server part with twice the threads.

The Xeon 634's largest victory is Cinebench R23 single-core, where it scores 4510 versus 2132, a 52.7% margin that is puzzling given the Ultra 5's higher boost clock. This is followed by Cinebench R15 single-core (454 vs 322, 29.1% ahead) and Cinebench R23 multi-core (31950 vs 25066, 21.5% ahead). The Xeon also wins integer math by 16.3% (117664 vs 98524) and data compression by 4% (477924 vs 458817). In extended instructions, the Xeon edges ahead by 1.8% (38320 vs 37617), a narrow but consistent advantage.

Looking at the remaining tests, the Ultra 5 sweeps the rest: Cinebench R15 multi-core (3850 vs 3220, 19.6% ahead), Cinebench R20 multi-core (15368 vs 13419, 14.5% ahead), Cinebench R20 single-core (2169 vs 1894, 14.5% ahead), PassMark multithread (43047 vs 37589, 14.5% ahead), random string sorting (55098 vs 47016, 17.2% ahead), and physics (3081 vs 2250, 36.9% ahead). The final tally—11 wins for the Ultra 5, 6 for the Xeon—understates the Ultra 5's dominance in everyday tasks. The Xeon's wins are concentrated in cache-hungry or heavily parallel server workloads, while the Ultra 5 wins everywhere else, including the vast majority of PassMark's real-world simulation tests. The data is clear: unless your workload specifically demands the Xeon's 48 MB L3 cache or 204.8 GB/s memory bandwidth, the Core Ultra 5 245K is the faster processor in almost every measurable way.