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

The Intel Core Ultra 7 265HX and Intel Core Ultra 7 255HX are nearly identical twins from the same Arrow Lake-HX family, sharing the same 20-core/20-thread configuration, 55W TDP, and integrated Arc Xe-LPG Graphics 64EU. Both sit at the 93rd percentile of all CPUs and their average benchmark scores differ by just 0.7%, with the 265HX at 63173 and the 255HX at 62738. The data shows a split personality: the 255HX wins 11 of 17 head-to-head tests, but the 265HX wins the most important single-core and multi-core workload benchmarks by dramatic margins. This is not a straightforward "newer is better" situation, nor is it a case where the higher model number automatically dominates. The choice between them depends entirely on which benchmark suite reflects your actual workload.

Head-to-Head Benchmarks

The most striking result in the entire comparison is the Cinebench R23 single-core test. The 265HX scores 5737 against the 255HX's 2163, a 165.2% advantage. That is not a marginal improvement; it is a generational gap within the same product stack. The 265HX also leads in Cinebench R15 single-core with 578 versus 327, a 76.8% delta. These results indicate that for any application that is heavily dependent on single-threaded performance—legacy software, many games, and lightly threaded productivity tools—the 265HX is in a different league.

Multi-core performance tells a more complicated story. The 265HX wins Cinebench R23 multi-core with 40642 against 32612, a 24.6% lead. But the 255HX wins Cinebench R15 multi-core with 4916 versus 4096, a 16.7% margin, and also takes Cinebench R20 multi-core by a narrow 0.7% (17187 vs 17069). The Cinebench R23 result is the more modern and demanding workload, so the 265HX's substantial lead there carries more weight for current rendering and compilation tasks. The R15 and R20 results suggest that the 255HX has an edge in certain legacy multi-threaded scenarios, but the scale of that edge is small compared to the 265HX's R23 dominance.

PassMark results favor the 255HX across the board, but by very small margins. The 255HX wins integer math (127126 vs 126954), data compression (515143 vs 511817), extended instructions (41247 vs 40741), multi-thread (48234 vs 47985), and single-thread (4562 vs 4500), with deltas ranging from 0.1% to 1.4%. The 265HX counters with wins in physics (2978 vs 2926, a 1.8% lead), floating point math (161605 vs 160624, a 0.6% lead), and find prime numbers (406 vs 400, a 1.5% lead). These PassMark deltas are essentially noise—no real-world user will notice a 0.5% difference in integer math. The Cinebench results are where the meaningful differences live.

The data encryption test is a virtual tie: 39472 for the 265HX and 39499 for the 255HX, a 0.1% delta. Random string sorting also goes to the 255HX by 0.2% (62591 vs 62458). Across all 17 benchmarks, the 255HX wins 11 and the 265HX wins 6. However, the average benchmark score tells a different story: the 265HX averages 63173, which is 0.7% higher than the 255HX's 62738. This means the 265HX's wins are in heavier-weight benchmarks that contribute more to the aggregate score, while the 255HX's many wins are in lighter tests with smaller score ranges.

FAQ

Q: Is the Intel Core Ultra 7 265HX always faster than the 255HX?

A: No. The 255HX wins 11 of 17 head-to-head benchmark comparisons, including Cinebench R15 multi-core (4916 vs 4096) and Cinebench R20 multi-core (17187 vs 17069). However, the 265HX wins the two most demanding tests: Cinebench R23 multi-core (40642 vs 32612) and Cinebench R23 single-core (5737 vs 2163).

Q: Which CPU has better single-core performance?

A: The data strongly favors the 265HX. It leads Cinebench R15 single-core by 76.8% (578 vs 327) and Cinebench R23 single-core by 165.2% (5737 vs 2163). In contrast, the 255HX wins PassMark single-thread by only 1.4% (4562 vs 4500).

Q: How do the average benchmark scores compare?

A: The 265HX has an average benchmark score of 63173, while the 255HX scores 62738. That is a 0.7% difference. Both CPUs sit at the 93rd percentile of all CPUs, indicating they are near the top of the overall performance distribution.

Q: Are these CPUs identical in specifications?

A: No, there are two key differences. The 265HX has a base clock of 2.60 GHz and a boost clock of 5.30 GHz, while the 255HX has a base clock of 2.40 GHz and a boost clock of 5.20 GHz. All other core, cache, memory, and graphics specifications are identical.

Q: Which CPU is better for multi-threaded rendering?

A: Based on Cinebench R23 multi-core, the 265HX is clearly better, scoring 40642 against the 255HX's 32612, a 24.6% advantage. However, the 255HX wins the older Cinebench R15 and R20 multi-core tests, so the answer depends on the specific rendering engine.

Q: What do the nearest rival comparisons show?

A: The 265HX's nearest rival is the Intel Core i7-13790F with a 0.1% delta, followed by the AMD Ryzen AI 7 450G at -0.2%. The 255HX's nearest rival is the AMD Ryzen AI Embedded P185 at -0.2%. Notably, the 255HX is the 265HX's fourth-closest rival, with a delta of 0.7%.

Where Each One Wins

The Intel Core Ultra 7 265HX is the clear choice for any workload that relies on high single-threaded performance. The Cinebench R23 single-core score of 5737 is more than 2.6 times the 255HX's 2163, which translates directly to snappier response in applications that cannot use many cores. It also wins the modern multi-core rendering test, Cinebench R23 multi-core, by 24.6%, making it the better option for current-generation 3D rendering, video encoding, and code compilation. The 265HX further excels in physics simulation (2978 vs 2926) and floating point math (161605 vs 160624), which are common in scientific computing and financial modeling.

The Intel Core Ultra 7 255HX takes the majority of wins, but its victories are concentrated in the PassMark suite and older Cinebench versions. It wins integer math (127126 vs 126954), data compression (515143 vs 511817), data encryption (39499 vs 39472), and extended instructions (41247 vs 40741). These are all small margins, but they indicate that the 255HX has a slight edge in general-purpose computing tasks that involve heavy integer arithmetic or data handling. It also wins PassMark multi-thread (48234 vs 47985) and single-thread (4562 vs 4500), suggesting that for the broad mix of workloads represented by PassMark, the 255HX is marginally more consistent. The 255HX's Cinebench R15 multi-core win (4916 vs 4096) and R20 multi-core win (17187 vs 17069) show it handles legacy multi-threaded applications well.

For users who run a mix of everyday applications, the 255HX's 11 wins across the benchmark suite suggest it is the safer all-rounder. For users who push their CPU with modern rendering or single-threaded tasks, the 265HX's dramatic wins in R23 are far more relevant.

Specification Differences

The two CPUs share the vast majority of their specifications, but the clock speeds differ. The 265HX has a base clock of 2.60 GHz compared to the 255HX's 2.40 GHz, and a boost clock of 5.30 GHz compared to 5.20 GHz. That is the only specification that differs between them. Both have 20 cores and 20 threads, a 55W TDP, the Intel BGA 2114 socket, and an unlocked multiplier. Both support DDR5 memory on a dual-channel bus with 102.4 GB/s bandwidth, and both have PCIe Gen 5 with 20 lanes for the CPU. The L1 cache is 192 KB per core, L2 is 3 MB per core, and L3 is 30 MB shared. Neither supports ECC memory. Both integrate Arc Xe-LPG Graphics with 64 execution units. The part numbers differ (SRVFH for the 265HX, SRVFG for the 255HX), but the release date is the same: 2025-01-12.

Architecture Differences

The two CPUs are architecturally identical. Both are built on Arrow Lake-HX, part of the Core Ultra Series 2 generation. They use the same 3 nm process node from TSMC, with 17,800 million transistors on a 243 mm² die. The codename is Arrow Lake-HX for both, and the generation is listed as "Ultra 7 (Arrow Lake-HX)" for both. There are no differences in the core architecture, cache hierarchy, or integrated graphics. The only architectural distinction is the clock speed difference, which is a binning difference rather than a design difference. Both are active production parts targeting the mobile market.

The Verdict

The data makes one thing clear: the Intel Core Ultra 7 265HX is the stronger processor for modern, demanding workloads. Its 24.6% lead in Cinebench R23 multi-core and 165.2% lead in Cinebench R23 single-core are decisive. If you are rendering scenes, compiling large codebases, or running any application that uses the Cinebench R23 engine, the 265HX is the only choice. The higher boost clock of 5.30 GHz versus 5.20 GHz gives it a real advantage in single-threaded tasks, and the data confirms that advantage is massive, not marginal.

The Intel Core Ultra 7 255HX is the pick for users who value consistency across a broad range of legacy and mixed workloads. It wins 11 of 17 benchmarks, including the older Cinebench R15 and R20 multi-core tests and the majority of PassMark tests. Its average benchmark score is only 0.7% lower than the 265HX, so it is not a slow chip by any measure. For a general-purpose laptop that runs office applications, web browsing, and occasional media work, the 255HX's more balanced profile is arguably better.

However, the 265HX's wins in the two most important Cinebench R23 tests are too large to ignore. A 24.6% multi-core advantage and a 165.2% single-core advantage are not minor differences; they represent a substantial performance gap in the workloads that matter most for power users. The 255HX's wins are all under 17%, and most are under 2%. The verdict from the data is straightforward: pick the 265HX for performance-critical tasks, pick the 255HX if you want the more broadly consistent performer and do not need the R23 headroom. Both sit at the 93rd percentile, so neither is a bad choice—but the 265HX is the one that wins where it counts.