Intel Core Ultra 7 255HX vs Intel Core Ultra 7 265 Comparison

# Where Each One Wins

The split between these two processors is unusually clean, and the database shows a stark division of labor. The Intel Core Ultra 7 265, a desktop part on Socket 1851, takes 13 of the 17 head-to-head benchmark wins. Its dominance is most pronounced in single-threaded workloads, where it leads by margins that range from 2.8% to a staggering 175.5%. The 265 also edges ahead in nearly every PassMark compute task, including data compression, encryption, extended instructions, prime number finding, floating-point math, integer math, multithreaded performance, random string sorting, and single-thread tests. This is the processor for tasks that reward raw per-core throughput and sustained desktop-class power delivery.

The Intel Core Ultra 7 255HX, a mobile BGA 2114 part, wins only 4 benchmarks, but its victories are concentrated in the Cinebench R15 and R20 multicore and singlecore suites. Notably, the 255HX beats the 265 by 13.4% in Cinebench R15 multicore and by 63.5% in both Cinebench R20 multicore and singlecore. These are not marginal wins; they are decisive swings that suggest the mobile chip's thermal and power management profile, despite a lower 55W TDP versus 65W, can push higher scores in specific rendering workloads. The 255HX also narrowly takes PassMark physics by 0.1%, a statistical tie but a win nonetheless.

The broader pattern is clear: the desktop 265 is the general-purpose compute leader, while the mobile 255HX has a narrow but pronounced advantage in certain Cinebench iterations. The average benchmark scores reflect this: the 265 posts an average score of 64,640, while the 255HX trails at 62,738. Both sit at the 93rd percentile among all CPUs, so neither is a slouch in absolute terms. The 265's nearest rivals include AMD EPYC 4464P and EPYC 9124, while the 255HX sits alongside AMD Ryzen AI Embedded P185 and Intel Core i7-13790F, placing both firmly in the upper tier of the database.

# Head-to-Head Benchmarks

The largest single win for the desktop 265 comes in Cinebench R23 singlecore, where it scores 5,960 against the 255HX's 2,163, a delta of 175.5%. This is not a subtle difference; it represents a fundamental gap in how the two chips handle single-threaded rendering. The 265 also wins Cinebench R23 multicore by 29.4%, scoring 42,216 versus 32,612. In Cinebench R15 singlecore, the 265 posts 600 against 327, a 83.5% advantage. These three results paint the 265 as the clear choice for Cinebench's newer and more demanding workloads.

The 255HX counters in Cinebench R20. It scores 17,187 in multicore against the 265's 6,268, a 63.5% lead. In singlecore, it posts 2,426 versus 884, also a 63.5% lead. The R15 multicore result shows the 255HX ahead by 13.4%, scoring 4,916 against 4,255. These results are anomalous when placed against the rest of the dataset, where the 265 wins every PassMark test except physics. The PassMark physics result is effectively a tie: 2,923 for the 265 and 2,926 for the 255HX, a delta of 0.1%.

The PassMark suite otherwise favors the 265 consistently. Data compression shows 522,983 versus 515,143, a 1.5% lead. Data encryption is 40,456 versus 39,499, a 2.4% edge. Extended instructions are close at 41,478 versus 41,247, only 0.6% apart. Floating-point math goes to the 265 by 7.6%, scoring 172,776 against 160,624. Integer math is 6% ahead at 134,773 versus 127,126. Multithreaded performance is 3% higher at 49,682 versus 48,234. Random string sorting is 2% ahead at 63,833 versus 62,591. Single-thread performance is 2.8% higher at 4,689 versus 4,562. The 265 also wins prime number finding by 4.5%, scoring 418 versus 400.

# Architecture Differences

Both processors share the same Arrow Lake architecture, but they diverge in packaging and platform. The 265 is the Arrow Lake-S desktop variant, while the 255HX is the Arrow Lake-HX mobile variant. Both use a 3 nm process from TSMC, both integrate 17,800 million transistors on a 243 mm² die, and both have identical cache hierarchies: 192 KB of L1 per core, 3 MB of L2 per core, and 30 MB of shared L3. Each has 20 cores and 20 threads, with no hyperthreading. Base clocks are identical at 2.40 GHz, but the 265 boosts to 5.30 GHz while the 255HX tops out at 5.20 GHz. The 265 has a 65W TDP and is not multiplier-unlocked, while the 255HX has a 55W TDP and is multiplier-unlocked.

The sockets differ completely: the 265 uses Intel Socket 1851, a desktop platform, while the 255HX uses Intel BGA 2114, a soldered mobile package. Both support dual-channel DDR5 memory with 102.4 GB/s bandwidth, and neither supports ECC. Both offer PCIe Gen 5 with 20 lanes from the CPU. The integrated graphics differ: the 265 features Arc Xe-LPG Graphics with 32 EU, while the 255HX doubles that to 64 EU. The 265 has a launch MSRP of $394, while the 255HX has no recorded launch MSRP. Release dates are close, with the 265 arriving on January 6, 2025, and the 255HX on January 12, 2025.

The architecture differences are minimal on paper, but the platform context matters. The desktop 265 can rely on more robust cooling and power delivery, which likely explains its higher boost clock and superior single-thread results. The mobile 255HX, despite a lower TDP, delivers surprising Cinebench R20 and R15 multicore wins, suggesting that its power management allows aggressive short-duration boosts. The unlocked multiplier on the 255HX also opens a path for tuning, though the database does not include overclocked results.

# FAQ

Q: Which processor has the higher boost clock?

A: The Intel Core Ultra 7 265 boosts to 5.30 GHz, while the Intel Core Ultra 7 255HX reaches 5.20 GHz. The 265 also has a higher TDP at 65W versus 55W.

Q: How do the two compare in Cinebench R23 multicore?

A: The 265 wins decisively with a score of 42,216 against the 255HX's 32,612, a 29.4% advantage. This is one of the largest multicore gaps in the dataset.

Q: Why does the 255HX win Cinebench R20 multicore by such a large margin?

A: The 255HX scores 17,187 versus the 265's 6,268, a 63.5% lead. The database does not explain the cause, but the result is consistent across both R20 multicore and singlecore tests, where the 255HX also leads by 63.5%.

Q: What are the integrated graphics capabilities of each?

A: The 265 has Arc Xe-LPG Graphics with 32 EU, while the 255HX has Arc Xe-LPG Graphics with 64 EU. The mobile chip offers double the execution units.

Q: Are both processors on the same process node?

A: Yes, both use a 3 nm process from TSMC, with 17,800 million transistors on a 243 mm² die.

Q: Which processor has a higher average benchmark score?

A: The 265 posts an average benchmark score of 64,640, while the 255HX averages 62,738. Both sit at the 93rd percentile among all CPUs.

# The Verdict

The data points to a clear recommendation for most users: the Intel Core Ultra 7 265 is the better processor. It wins 13 of 17 head-to-head benchmarks, including every PassMark test except physics, and it dominates Cinebench R23 and R15 singlecore. Its average benchmark score is higher at 64,640 versus 62,738, and it holds a 2.8% lead in single-thread PassMark performance. For desktop users building on Socket 1851, the 265 is the obvious choice, especially for workloads that rely on single-core speed, data compression, encryption, and floating-point math. Its 5.30 GHz boost clock and 65W TDP give it the headroom to sustain those advantages.

The 255HX is not without merit, but its wins are confined to a narrow set of Cinebench tests. The 63.5% leads in R20 multicore and singlecore are striking, and the 13.4% win in R15 multicore shows that the mobile chip can outperform the desktop part in specific rendering scenarios. Users targeting Cinebench R20 specifically, or those who need a mobile platform with an unlocked multiplier and a 55W TDP, may prefer the 255HX. Its 64 EU integrated graphics also offer twice the execution units of the 265, a factor for thin-and-light systems without discrete GPUs.

The verdict from the database is that the 265 is the general-purpose champion, while the 255HX is a niche specialist. Both reach the 93rd percentile, so neither is a weak choice. The 265's nearest rival, AMD EPYC 4464P, sits only 0.3% above it in average score, while the 255HX trails AMD Ryzen AI Embedded P185 by 0.2%. For desktop compute, take the 265. For mobile workloads where Cinebench R20 matters most, the 255HX has a case. Otherwise, the 265 leads.