Intel Core 5 320 vs Intel Core i7-1255U Comparison

Head-to-Head Benchmarks

The benchmark data reveals a clear split between these two Intel mobile processors, with the Intel Core 5 320 taking 14 of 17 head-to-head tests, while the Intel Core i7-1255U claims only 3 wins. The most dramatic divergence comes in the PassMark extended instructions test, where the Core 5 320 scores 13,262 versus 8,231 for the i7-1255U, a 61.1% advantage. This suggests the newer Wildcat Lake architecture handles complex instruction sets with far greater efficiency.

The single-core results consistently favor the Core 5 320. In Cinebench R15 single-core, it posts 276 versus 237.5, a 16.2% lead. The gap widens in Cinebench R20 single-core (771 versus 654, a 17.9% delta) and further in Cinebench R23 single-core (1,926 versus 1,647, a 16.9% delta). PassMark single-thread testing shows the same pattern: 4,045 versus 3,192, a 26.7% advantage. The Core 5 320's 4.60 GHz boost clock, combined with the 3 nm process, appears to deliver substantially higher per-thread performance than the i7-1255U's 4.70 GHz boost on a 10 nm node.

However, the multi-core picture is more complex. The i7-1255U wins Cinebench R15 multi-core decisively: 1,387 versus 1,054, a 24% margin. It also takes Cinebench R23 multi-core, scoring 8,285 versus 6,197, a 25.2% lead. Yet in Cinebench R20 multi-core, the Core 5 320 flips the script entirely, winning 5,462 versus 4,635, a 17.8% advantage. This inconsistency between R20 and R23 results is curious; typically these workloads scale similarly. The i7-1255U's 10 cores and 12 threads versus the Core 5 320's 6 cores and 6 threads should give it a structural advantage in heavily threaded scenes, but the Wildcat Lake chip's higher per-core IPC seems to close the gap in R20.

The PassMark integer math test is the i7-1255U's other win, and it is substantial: 48,498 versus 32,323, a 33.4% margin. This is likely a reflection of the i7-1255U's hybrid core layout, which includes performance and efficiency cores that can handle diverse integer workloads in parallel. The Core 5 320 counters with a 30.1% win in floating-point math (42,440 versus 32,618) and a 54.8% lead in physics (1,221 versus 789).

The remaining tests heavily favor the Core 5 320. Data encryption shows an 18.6% edge (10,984 versus 9,262). Prime number finding is lopsided: 110 versus 40, a 175% difference, suggesting the newer architecture's integer and branch prediction capabilities are far superior for this specific workload. Random string sorting goes to the Core 5 320 by 6.5% (18,038 versus 16,934), and data compression is nearly tied at 1% (148,779 versus 147,320). The multithread PassMark score favors the Core 5 320 by 16.7% (15,450 versus 13,234), reinforcing that despite fewer cores, its overall threaded throughput is higher in most real-world simulations.

FAQ

Q: Which processor has the higher average benchmark score?

A: The Intel Core 5 320 averages 18,023 across all recorded benchmarks, placing it in the 72nd percentile of all CPUs. The Intel Core i7-1255U averages 17,656, sitting at the 71st percentile. The Core 5 320's nearest rival is the AMD Ryzen 5 1600 at 17,994 (0.2% behind), while the i7-1255U's closest competitor is the Intel Core i3-13100F at 17,653 (0% delta).

Q: How does the Core 5 320's single-core performance compare to the i7-1255U?

A: The Core 5 320 wins every single-core benchmark in the head-to-head data. In Cinebench R23 single-core it scores 1,926 versus 1,647, a 16.9% lead. PassMark single-thread shows a 26.7% advantage (4,045 versus 3,192). The Core 5 320's boost clock of 4.60 GHz is slightly lower than the i7-1255U's 4.70 GHz, but the 3 nm process node appears to deliver higher instructions-per-clock.

Q: Why does the i7-1255U win Cinebench R15 and R23 multi-core but lose R20 multi-core?

A: The data shows the i7-1255U winning R15 multi-core by 24% (1,387 versus 1,054) and R23 multi-core by 25.2% (8,285 versus 6,197), but losing R20 multi-core by 17.8% (4,635 versus 5,462). This suggests that R20's workload characteristics favor the Core 5 320's 6 larger cores, while R15 and R23 may leverage the i7-1255U's 10 cores and 12 threads more effectively. The inconsistency highlights how benchmark-specific performance can be.

Q: What is the most significant single benchmark difference between the two?

A: The PassMark find prime numbers test shows the largest gap: the Core 5 320 scores 110 versus the i7-1255U's 40, a 175% difference. This indicates a massive advantage in integer-heavy, branch-intensive workloads for the newer Wildcat Lake architecture.

Q: Which processor has better memory bandwidth?

A: The Core 5 320 supports DDR5 and LPDDR5X memory with a single-channel bus and rated bandwidth of 59.7 GB/s. The i7-1255U supports DDR4 and DDR5 with a dual-channel bus, but the database does not record a bandwidth figure for it. The dual-channel design of the i7-1255U could provide higher real-world bandwidth, but no measured number is available for comparison.

Q: How do the integrated graphics compare?

A: The Core 5 320 features Intel Xe3 Graphics with 2 Xe cores, while the i7-1255U has Iris Xe 96EU graphics. The database does not include graphics-specific benchmark scores, so the comparison is limited to the architectural specification. The i7-1255U's 96EU configuration suggests a larger execution unit count, but no performance data confirms this.

The Verdict

The recorded data clearly favors the Intel Core 5 320 for most use cases. It wins 14 of 17 head-to-head benchmarks, including all single-core tests, all encryption and compression workloads, floating-point math, physics simulation, and multithread PassMark. Its 61.1% lead in extended instructions and 175% lead in prime number finding make it the stronger choice for scientific computing, cryptography, and complex instruction workloads.

The Intel Core i7-1255U should be selected by users prioritizing specific multi-core rendering tasks. Its 24% win in Cinebench R15 multi-core and 25.2% win in R23 multi-core indicate that heavily threaded render workloads in those specific benchmarks respond better to its 10 cores and 12 threads. The 33.4% advantage in integer math also makes it preferable for integer-heavy data processing tasks.

For general productivity, single-threaded applications, development, or any workload where per-core speed matters, the Core 5 320 is the superior choice based on the data. Its 26.7% single-thread lead and higher average benchmark score (18,023 versus 17,656) support this conclusion. Users who frequently run Cinebench R15 or R23 rendering tests should note the i7-1255U's strength there, but the overall pattern of wins strongly favors the newer Core 5 320.

Specification Differences

The two processors differ in nearly every core specification. The Intel Core 5 320 has 6 cores and 6 threads, while the Intel Core i7-1255U has 10 cores and 12 threads. Base clocks diverge sharply: the Core 5 320 runs at 1.50 GHz, while the i7-1255U lists a base clock of 1700.00 GHz (the database records this value, though it appears to be an artifact of the data entry; the boost clocks are more comparable). The Core 5 320 boosts to 4.60 GHz, and the i7-1255U boosts to 4.70 GHz.

The Core 5 320 uses the Intel BGA 1516 socket, while the i7-1255U uses Intel BGA 1744. The Core 5 320 is built on a 3 nm process, whereas the i7-1255U uses 10 nm. Cache configurations differ substantially: the Core 5 320 has 192 KB L1, 2.5 MB L2, and 6 MB shared L3. The i7-1255U has 80 KB per core L1, 1.25 MB per core L2, and 12 MB shared L3. The i7-1255U's larger total L3 cache likely helps its multi-core wins.

Memory support separates them: the Core 5 320 supports DDR5 and LPDDR5X with a single-channel bus and 59.7 GB/s bandwidth. The i7-1255U supports DDR4 and DDR5 with a dual-channel bus, though no bandwidth figure is recorded. PCIe lanes differ: the Core 5 320 offers Gen 4 with 6 lanes, while the i7-1255U offers Gen 4 with 20 lanes. Integrated graphics are also distinct: Xe3 Graphics (2 Xe) on the Core 5 320 versus Iris Xe 96EU on the i7-1255U. The i7-1255U launched on 2022-02-22, while the Core 5 320 has a 2026-04-15 release date and a launch MSRP of $340.

Architecture Differences

The Core 5 320 is codenamed Wildcat Lake and belongs to the Core 5 generation, while the i7-1255U is codenamed Alder Lake-U and belongs to the Core i7 generation. The Wildcat Lake chip is fabricated on a 3 nm process, a major architectural step forward from the i7-1255U's 10 nm node. Both are manufactured by Intel, but the process node difference explains much of the Core 5 320's per-core efficiency advantage.

The Core 5 320 presents a uniform 6-core, 6-thread design with no hybrid arrangement, as indicated by its equal core and thread counts. The i7-1255U's 10 cores and 12 threads imply a hybrid architecture with performance and efficiency cores, typical of Alder Lake designs. This hybrid setup explains the i7-1255U's wins in heavily threaded benchmarks where additional efficiency cores can contribute.

Cache architecture differs fundamentally. The Core 5 320 reports L1 and L2 as aggregate capacities (192 KB and 2.5 MB, respectively), suggesting a monolithic layout. The i7-1255U reports per-core L1 of 80 KB and per-core L2 of 1.25 MB, indicating a different distribution. The i7-1255U's 12 MB shared L3 doubles the Core 5 320's 6 MB shared L3, which may aid its multi-core performance in cache-sensitive workloads.

The Core 5 320's memory controller supports only single-channel DDR5/LPDDR5X, while the i7-1255U supports dual-channel DDR4/DDR5. PCIe connectivity also differs: 6 lanes versus 20 lanes, both Gen 4. The i7-1255U's additional PCIe lanes make it more suitable for systems with multiple high-speed peripherals.

Where Each One Wins

The Intel Core 5 320 wins in: single-core performance across all Cinebench versions (R15, R20, R23) and PassMark single-thread tests, with deltas ranging from 16.2% to 26.7%. It also wins Cinebench R20 multi-core (17.8%), PassMark multithread (16.7%), data encryption (18.6%), extended instructions (61.1%), find prime numbers (175%), floating-point math (30.1%), physics (54.8%), random string sorting (6.5%), and data compression (1%). These results cover the majority of general computing, scientific, and productivity workloads.

The Intel Core i7-1255U wins in: Cinebench R15 multi-core (24%), Cinebench R23 multi-core (25.2%), and PassMark integer math (33.4%). These are the only three benchmarks where the i7-1255U takes the lead, but they represent important categories. Cinebench R15 and R23 are widely used for rendering performance assessment, so content creators running those specific tests will see faster results on the i7-1255U. The integer math advantage suggests it handles integer-heavy data processing better, despite losing the broader multithread PassMark test.

Users working with floating-point calculations, physics simulations, encryption, compression, or any single-threaded application should choose the Core 5 320 based on the data. Users running Cinebench R15 or R23 multi-core renders, or integer-heavy data transformation workloads, should consider the i7-1255U. The Core 5 320's 72nd percentile ranking versus the i7-1255U's 71st percentile, combined with its 14-to-3 head-to-head win ratio, makes it the default recommendation for most laptop buyers, with the i7-1255U reserved for niche multi-core rendering scenarios.