Intel Core 3 100U vs Intel Core i5-1235U Comparison

FAQ

Q: Which processor has the higher boost clock?

A: The Intel Core 3 100U has a boost clock of 4.70 GHz, while the Intel Core i5-1235U reaches 4.40 GHz. The Core 3 100U also has a base clock of 1.20 GHz compared to the i5-1235U's 1300.00 MHz.

Q: How do the two CPUs compare in multi-core rendering workloads?

A: The Core 3 100U leads across all Cinebench multi-core tests. In Cinebench R23 multi-core, it scores 10,624 versus 9,774 for the i5-1235U, an 8.7% advantage. Similar margins appear in Cinebench R20 (4,462 vs 4,105) and R15 (1,070 vs 985).

Q: Does the i5-1235U have any significant wins in the benchmark data?

A: Yes, the i5-1235U dominates in several PassMark workloads. The largest gap is in the find prime numbers test, where it scores 954 versus just 52 for the Core 3 100U, a 94.5% difference. It also wins floating point math (43,303 vs 28,322) and integer math (48,553 vs 39,580).

Q: Which chip has the higher overall average benchmark score?

A: The Intel Core i5-1235U has an average benchmark score of 16,770, while the Core 3 100U averages 16,148. Both sit at the 70th percentile among all tested CPUs, though the i5-1235U edges ahead by roughly 3.8% in aggregate.

Q: What are the core and thread counts for each processor?

A: The Intel Core 3 100U has 6 cores and 8 threads. The Intel Core i5-1235U has 10 cores and 12 threads, giving it a raw multi-threading capacity advantage that shows up in specific workloads.

Q: Which CPU wins the single-threaded PassMark test?

A: The Core 3 100U wins PassMark single-thread with a score of 3,506 versus 3,151 for the i5-1235U, an 11.3% margin. This is one of the largest single-test wins for the Core 3 100U in the data.

Architecture Differences

The two processors come from different Intel microarchitecture families despite sharing the same 10 nm process node. The Core 3 100U is built on Raptor Lake, specifically the Raptor Lake-U variant, while the i5-1235U uses Alder Lake-U. Both are produced by Intel and target the mobile segment, but the underlying designs differ in core configuration and feature set.

The Core 3 100U packs 6 cores and 8 threads, a smaller core count than the i5-1235U's 10 cores and 12 threads. The i5-1235U's extra cores are part of a hybrid architecture that Raptor Lake also employs, but the specific core mix and thread allocation differ. Both processors use the same L1 cache per core (80 KB) and L2 cache per core (1.25 MB), but the shared L3 cache is larger on the i5-1235U: 12 MB versus 10 MB on the Core 3 100U.

Memory support is identical: both support DDR4 and DDR5 in dual-channel configurations, and neither supports ECC memory. The PCIe implementation differs notably. The Core 3 100U provides Gen 4 with 8 lanes (CPU only), while the i5-1235U offers Gen 4 with 20 lanes (CPU only). This is a substantial difference for expandability, though both are mobile parts.

Integrated graphics also separate the two. The Core 3 100U comes with UHD Graphics 64EU, whereas the i5-1235U uses Iris Xe 80EU. The higher EU count on the i5-1235U suggests stronger graphics throughput, though the benchmark data focuses on CPU workloads.

The release dates differ by nearly two years. The i5-1235U launched on 2022-02-22, while the Core 3 100U arrived on 2024-01-07. Both are listed as active in production. The Core 3 100U has a launch MSRP of $426, while no launch MSRP is recorded for the i5-1235U. Neither processor has an unlocked multiplier, and both use the Intel BGA 1744 socket.

Head-to-Head Benchmarks

The benchmark data reveals a clear split: the Core 3 100U dominates rendering and single-threaded workloads, while the i5-1235U excels in math-heavy and data-processing tasks. The Core 3 100U wins 9 of the 17 head-to-head tests, with the i5-1235U taking 8.

In Cinebench tests, the Core 3 100U is consistently ahead. Across R15, R20, and R23, both single-core and multi-core scores favor the Core 3 100U by margins ranging from 8.6% to 8.7%. In Cinebench R23 single-core, the Core 3 100U scores 1,499 versus 1,379 for the i5-1235U. Multi-core R23 shows 10,624 versus 9,774. The pattern is uniform: the Core 3 100U holds roughly an 8.7% edge in all six Cinebench subtests.

The PassMark suite tells a different story. The i5-1235U wins seven PassMark tests, including some by dramatic margins. The most extreme is find prime numbers: 954 for the i5-1235U versus 52 for the Core 3 100U, a 94.5% deficit for the Core 3 100U. Floating point math also swings heavily toward the i5-1235U: 43,303 versus 28,322, a 34.6% difference. Integer math shows an 18.5% gap (48,553 vs 39,580). Data encryption favors the i5-1235U by 13% (9,347 vs 8,128), while data compression is 7.4% ahead (147,450 vs 136,497). Random string sorting sees the i5-1235U lead by 10.9% (17,050 vs 15,191), and extended instructions go to the i5-1235U by 3.4% (8,176 vs 7,894).

The Core 3 100U counters in PassMark with strong single-thread and physics results. PassMark single-thread shows 3,506 versus 3,151, an 11.3% win. The physics test is the Core 3 100U's best PassMark result: 876 versus 686, a 27.7% advantage. PassMark multithread is close, with the i5-1235U ahead by just 3.1% (12,923 vs 12,522).

The aggregate picture is balanced. The Core 3 100U wins more tests (9 vs 8), but the i5-1235U wins the average benchmark score comparison (16,770 vs 16,148). The i5-1235U's large margins in specific math tests outweigh the Core 3 100U's narrower but consistent Cinebench wins.

Specification Differences

The two CPUs differ on several key specification fields. The most obvious is core count: 6 cores for the Core 3 100U versus 10 cores for the i5-1235U. Thread counts follow suit at 8 and 12 respectively. Base clocks are listed differently in the data: the Core 3 100U has a 1.20 GHz base, while the i5-1235U shows 1300.00 MHz. Boost clocks favor the Core 3 100U at 4.70 GHz versus 4.40 GHz.

Architecture generation separates them: Raptor Lake-U for the Core 3 100U and Alder Lake-U for the i5-1235U. The L3 cache is larger on the i5-1235U (12 MB shared) than on the Core 3 100U (10 MB shared). PCIe lane count is a major differentiator: the i5-1235U offers 20 Gen 4 lanes (CPU only), while the Core 3 100U provides just 8.

Integrated graphics differ in EU count: UHD Graphics 64EU on the Core 3 100U versus Iris Xe 80EU on the i5-1235U. Release dates are also distinct, with the i5-1235U launching in February 2022 and the Core 3 100U in January 2024. The Core 3 100U has a recorded launch MSRP of $426, while the i5-1235U has no launch MSRP in the database. Part numbers differ (SRMYL for the Core 3 100U, SRLFR for the i5-1235U), and both use the Intel BGA 1744 socket.

Both CPUs share identical L1 and L2 cache per core (80 KB and 1.25 MB), the same 10 nm process node, dual-channel memory buses, DDR4/DDR5 support, no ECC, and a 15 W TDP. Neither has an unlocked multiplier, and both are active mobile parts.

Where Each One Wins

The Core 3 100U is the pick for rendering and single-threaded responsiveness. Its Cinebench sweep, with 8.7% margins across R15, R20, and R23 in both single and multi-core, indicates a well-tuned architecture for 3D modeling, video encoding, and other creative workloads that scale with CPU throughput. The 11.3% PassMark single-thread win reinforces this: everyday applications, web browsing, and office tasks that rely on single-core speed will feel snappier on the Core 3 100U. The 27.7% physics test win suggests it also handles simulation and physics-based workloads better, which matters for some engineering and scientific applications.

The i5-1235U is the stronger choice for math-intensive and data-processing tasks. The 94.5% advantage in find prime numbers is extraordinary and points to a major difference in integer arithmetic or instruction-level throughput in that specific workload. Floating point math (34.6% ahead) and integer math (18.5% ahead) make it the better chip for spreadsheet crunching, financial modeling, scientific computing, and any workload that hammer the FPU or ALU. Data compression and encryption wins (7.4% and 13%) indicate it handles database work, file archiving, and secure data handling more efficiently. The random string sorting advantage (10.9%) and extended instructions win (3.4%) round out a profile suited to algorithm-heavy code, data wrangling, and general server-like tasks.

The multithread PassMark result is nearly even, with the i5-1235U ahead by just 3.1%. That means for purely parallel workloads that are not cache-sensitive, the two chips are close, despite the i5-1235U's extra cores and threads. The Core 3 100U's higher boost clock and newer architecture compensate for fewer cores in many scenarios.

For users who prioritize all-around performance, the average benchmark scores suggest the i5-1235U holds a slight edge (16,770 vs 16,148). But the Core 3 100U wins more individual tests, so the choice depends on workload. Rendering, single-threaded apps, and physics favor the Core 3 100U. Math, data, and encryption workloads favor the i5-1235U. The i5-1235U also offers more PCIe lanes, which matters for external GPU docks or high-speed storage expansion, though the Core 3 100U's 8 lanes are sufficient for many mobile setups.