Intel Core Ultra 9 275HX vs Intel Xeon Platinum 8270 Comparison

FAQ

Q: Which processor has more physical cores?

A: The Intel Xeon Platinum 8270 has 26 cores, while the Intel Core Ultra 9 275HX has 24 cores. However, the Xeon supports 52 threads through Hyper-Threading, whereas the Ultra 9 operates with 24 threads total.

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

A: The Xeon Platinum 8270 wins significantly, scoring 4032 versus 2204 for the Core Ultra 9 275HX. This represents an 82.9% advantage for the Xeon in that specific test.

Q: What is the biggest benchmark win for the Core Ultra 9 275HX?

A: The largest margin comes from PassMark data encryption, where the Ultra 9 scores 47112 against the Xeon's 8798, an 81.3% advantage. PassMark find prime numbers also shows a similar 81.2% gap in favor of the Ultra 9.

Q: Are both processors in the same performance percentile?

A: Yes, both the Intel Xeon Platinum 8270 and the Intel Core Ultra 9 275HX are recorded at the 94th percentile when compared against all CPUs in the database.

Q: Which processor supports ECC memory?

A: The Intel Xeon Platinum 8270 supports ECC memory. The Intel Core Ultra 9 275HX does not support ECC memory.

Q: What is the total number of benchmark wins for each processor in the head-to-head tests?

A: The Intel Core Ultra 9 275HX wins 11 of the 17 head-to-head benchmarks. The Intel Xeon Platinum 8270 wins 6 of those benchmarks.

Architecture Differences

The two processors come from fundamentally different design philosophies and manufacturing generations. The Intel Xeon Platinum 8270 is built on Cascade Lake architecture, specifically Cascade Lake-SP, using a 14 nm process node fabricated by Intel. It contains 8,000 million transistors. In contrast, the Intel Core Ultra 9 275HX uses Arrow Lake architecture, specifically Arrow Lake-HX, on a 3 nm process node fabricated by TSMC, with a transistor count of 17,800 million and a die size of 243 mm². The process node difference alone explains much of the efficiency and clock speed gap between them.

Cache hierarchies differ notably. The Xeon Platinum 8270 has 64 KB of L1 cache per core, 1 MB of L2 cache per core, and a shared 35.75 MB L3 cache. The Core Ultra 9 275HX has substantially larger per-core caches: 192 KB of L1 per core and 3 MB of L2 per core, along with a slightly larger shared L3 cache at 36 MB. The larger L2 cache in the Ultra 9 is particularly relevant for workloads that repeatedly access a working set that fits within that cache level.

Memory support represents another major architectural divergence. The Xeon Platinum 8270 supports DDR4 memory, while the Core Ultra 9 275HX supports DDR5 with a dual-channel memory bus and a recorded memory bandwidth of 102.4 GB/s. The Xeon's memory bus and bandwidth figures are not listed in the database, but the ECC memory support on the Xeon indicates a server-oriented design. The Ultra 9 lacks ECC support, aligning with its mobile market segment.

The socket and platform targets are completely different. The Xeon Platinum 8270 uses Intel Socket 3647, a server platform, while the Core Ultra 9 275HX uses Intel BGA 2114, a mobile soldered platform. The Xeon is not multiplier unlocked, whereas the Ultra 9 is multiplier unlocked. The Ultra 9 also includes integrated graphics in the form of Arc Xe-LPG Graphics 64EU, while the Xeon has no integrated graphics listed. The Ultra 9 supports PCIe Gen 5 with 20 lanes from the CPU, while the Xeon's PCIe configuration is not recorded in the database.

The release dates are separated by more than six years. The Xeon Platinum 8270 was released on 2018-12-10, while the Core Ultra 9 275HX was released on 2025-01-12. The Ultra 9 is marked as Active in production status, while the Xeon's production status is not listed. The Ultra 9 belongs to the Core Ultra Series 2 family, while the Xeon has no series designation.

Head-to-Head Benchmarks

The benchmark results reveal a clear split between multithreaded throughput and certain single-threaded legacy tests. The Core Ultra 9 275HX dominates most multithreaded workloads. In Cinebench R15 multicore, the Ultra 9 scores 5619.5 against the Xeon's 2878, a 48.8% advantage. Cinebench R20 multicore shows a 39.7% gap, with the Ultra 9 at 19899 versus 11995. Cinebench R23 multicore narrows the margin, but the Ultra 9 still leads with 35589 versus 28561, a 19.7% difference.

PassMark multithread results reinforce this trend. The Ultra 9 scores 55759 versus 29986, a 46.2% advantage. PassMark physics shows an even larger gap: 3338 versus 903, a 72.9% lead for the Ultra 9. Floating point math also favors the Ultra 9 heavily, with 191186 versus 99432, a 48% advantage. These results suggest that the Ultra 9's architecture provides substantially higher throughput per thread, compensating for its two fewer physical cores.

The Xeon Platinum 8270 wins in several specific areas. Cinebench R15 singlecore gives the Xeon a 21.6% edge, scoring 406 versus 334. Cinebench R23 singlecore shows a dramatic 82.9% lead for the Xeon, with 4032 versus 2204. This is an unusual result, given that the Ultra 9 has a much higher boost clock of 5.40 GHz compared to the Xeon's 4.00 GHz. The database records these results as they are, and they suggest that the older Xeon architecture executes certain single-threaded instructions more efficiently, or the test conditions favored the server chip.

PassMark data compression goes to the Xeon with 728144 versus 608381, a 19.7% advantage. Extended instructions favor the Xeon by 8.9%, scoring 51191 versus 47016. Integer math is nearly even, with the Xeon winning by 3.3% at 160322 versus 155218. Random string sorting also goes to the Xeon, 80208 versus 74320, a 7.9% margin.

The data encryption test is a massive win for the Ultra 9, scoring 47112 versus 8798, an 81.3% gap. Find prime numbers also heavily favors the Ultra 9 at 448 versus 84, an 81.2% difference. Single-thread PassMark results show the Ultra 9 at 4713 versus 2325, a 50.7% advantage. The overall benchmark win count is 11 for the Ultra 9 and 6 for the Xeon.

Specification Differences

The two processors differ in nearly every measurable specification category. Core count differs: 26 for the Xeon, 24 for the Ultra 9. Thread count differs more dramatically: 52 for the Xeon versus 24 for the Ultra 9. Base clocks are identical at 2.70 GHz, but boost clocks diverge sharply, with the Xeon at 4.00 GHz and the Ultra 9 at 5.40 GHz.

Thermal design power presents a stark contrast. The Xeon Platinum 8270 is rated at 205 W, while the Core Ultra 9 275HX is rated at 55 W. This 150 W difference reflects the mobile versus server positioning and the efficiency gains from the 3 nm process node.

Socket types are incompatible: Intel Socket 3647 for the Xeon versus Intel BGA 2114 for the Ultra 9. Process nodes differ: 14 nm for the Xeon versus 3 nm for the Ultra 9. Foundries differ: Intel for the Xeon versus TSMC for the Ultra 9. Transistor counts differ: 8,000 million versus 17,800 million. Die size is listed only for the Ultra 9 at 243 mm².

Cache configurations differ across all levels. L1 cache is 64 KB per core for the Xeon versus 192 KB per core for the Ultra 9. L2 cache is 1 MB per core for the Xeon versus 3 MB per core for the Ultra 9. L3 cache is 35.75 MB shared for the Xeon versus 36 MB shared for the Ultra 9.

Memory support differs: DDR4 for the Xeon versus DDR5 for the Ultra 9. Memory bus is unlisted for the Xeon but is dual-channel for the Ultra 9. Memory bandwidth is unlisted for the Xeon but is 102.4 GB/s for the Ultra 9. ECC support is present on the Xeon but absent on the Ultra 9. PCIe support is unlisted for the Xeon but is Gen 5 with 20 lanes for the Ultra 9. Integrated graphics are absent on the Xeon but present on the Ultra 9 as Arc Xe-LPG Graphics 64EU.

Market segments differ: Server/Workstation for the Xeon versus Mobile for the Ultra 9. Production status is unlisted for the Xeon but Active for the Ultra 9. Release dates differ by over six years, as noted. The multiplier is locked on the Xeon but unlocked on the Ultra 9. Part numbers differ: SRF96CD8069504195201 for the Xeon versus SRVFK for the Ultra 9.

The Verdict

The data paints a clear picture of two processors designed for entirely different purposes. The Intel Core Ultra 9 275HX is the stronger performer in the majority of benchmarks, winning 11 of 17 head-to-head tests. Its advantages in multithreaded workloads, encryption, prime number finding, floating point math, and single-thread PassMark are substantial. The Ultra 9 achieves this while consuming 55 W, compared to the Xeon's 205 W, and with a boost clock of 5.40 GHz versus 4.00 GHz.

The Intel Xeon Platinum 8270 retains relevance in specific niches. It wins in data compression, extended instructions, integer math, random string sorting, and two Cinebench single-core tests. The Xeon's 52 threads and ECC memory support make it a viable option for server workloads that prioritize memory reliability and high thread counts. Its 26 cores and 52 threads provide more parallel execution contexts than the Ultra 9's 24 threads.

The average benchmark scores in the database show the Xeon at 71370 and the Ultra 9 at 67469. The Xeon's nearest rivals include the Intel Xeon 6511P at 71051 (0.4% difference) and the AMD Ryzen 7 8840HX at 71797 (0.6% difference). The Ultra 9's nearest rivals include the Intel Xeon w5-3525 at 67673 (0.3% difference) and the AMD EPYC 4484PX at 67822 (0.5% difference). Both processors sit at the 94th percentile overall.

For users who need maximum multithreaded throughput in a mobile form factor with integrated graphics and modern DDR5 memory, the Core Ultra 9 275HX is the clear choice. For users who require ECC memory, a server socket, and the highest thread count available, the Xeon Platinum 8270 remains a relevant entry in the database.

Where Each One Wins

The Core Ultra 9 275HX wins decisively in compute-heavy parallel workloads. Cinebench R15, R20, and R23 multicore tests all favor the Ultra 9, with margins ranging from 19.7% to 48.8%. PassMark multithread and physics tests show even larger gaps, at 46.2% and 72.9% respectively. Encryption work is a standout strength, with an 81.3% lead. Prime number finding shows an 81.2% advantage. Floating point math runs 48% faster on the Ultra 9. Single-thread PassMark performance is 50.7% better, making the Ultra 9 the better choice for everyday responsive tasks.

The Xeon Platinum 8270 wins in data compression, where it leads by 19.7%, suggesting strong memory bandwidth utilization or cache efficiency for compression algorithms. Extended instructions show an 8.9% advantage, indicating the Xeon handles certain instruction sets more efficiently. Integer math is nearly tied, but the Xeon edges ahead by 3.3%. Random string sorting favors the Xeon by 7.9%. The Cinebench R15 single-core win of 21.6% and the R23 single-core win of 82.9% are anomalies in the data, but they are recorded results that indicate the Xeon executes those specific workloads faster.

The 52-thread count on the Xeon makes it suited for workloads that scale with thread count rather than per-thread performance. The Ultra 9's 24 threads, combined with much higher per-thread throughput, make it better for workloads that benefit from high clock speeds and modern architecture. The Ultra 9's integrated graphics provide a display output capability that the Xeon lacks entirely, making it a complete mobile solution. The Xeon's ECC memory support and server socket target it toward data center deployments where reliability and replaceability matter more than raw speed.