Intel Core i5-1235U

The Intel Core i5-1235U is a 10-core, 12-thread mobile processor from the Alder Lake-U family, built on Intel's 10 nm process. It operates at a base clock of 1300 MHz and a boost clock of 4.40 GHz, with a 15W TDP. Its benchmark scores place it in the 75th percentile of all CPUs, and it sits within 0.1% of several desktop and mobile rivals in average score.

Benchmark Performance

The i5-1235U delivers a Cinebench R23 multi-core score of 10984 and a single-core score of 1550. In Cinebench R20, it scores 4613 multi-core and 651 single-core, while in the older R15 test it reaches 1107 multi-core and 156 single-core. Geekbench results show 5656 multi-core and 1835 single-core. Passmark’s multithread score is 12923, with a single-thread score of 3151. These figures position the chip as a solid mid-range mobile part, comfortably above entry-level processors.

When compared to its nearest rivals, the i5-1235U is effectively tied with the Intel Core i3-12100E, showing a 0.0% delta in average benchmark score. It trails the AMD EPYC 7702 and the AMD Ryzen 3 210 by a negligible 0.1% each. The average benchmark score of 16910 is nearly identical to the i3-12100E’s 16905, the EPYC 7702’s 16932, and the Ryzen 3 210’s 16934. This means that in everyday mixed workloads, the i5-1235U performs on par with those chips, despite being a low-power mobile part.

The Passmark sub-tests reveal specific strengths. The data compression score of 147450 is particularly strong, indicating fast file archiving and compression tasks. Integer math scores 48553, floating point math scores 43303, and extended instructions score 8176. The random string sorting score of 17050 and find prime numbers score of 954 round out the integer-heavy workload picture. Data encryption scores 9347, which is respectable for a 15W chip. These numbers suggest that the i5-1235U handles a broad range of compute tasks without bottlenecking, though its absolute performance is not in the top tier.

Power and Thermals

The i5-1235U has a TDP of 15W, which classifies it as an ultra-low-power mobile processor. This TDP level is typical for thin-and-light laptops where thermal headroom is limited. The 10 nm process node and Alder Lake architecture contribute to its efficiency. The low TDP means that a modest cooling solution—such as a small fan or heat pipe—can keep the chip within its operating envelope. This makes the processor suitable for passively cooled designs or devices where fan noise is a concern. The base clock of 1300 MHz is conservative, allowing the chip to idle at low power, while the 4.40 GHz boost clock can be sustained for short bursts when needed. The 15W figure is a design target; actual power draw will vary with load, but the thermal solution required is minimal compared to higher-TDP desktop parts.

Single-Thread vs Multi-Thread Behavior

The i5-1235U shows a clear split between single-thread and multi-thread performance. In Cinebench R23, the single-core score of 1550 is modest, while the multi-core score of 10984 is roughly seven times higher. Geekbench follows a similar pattern: 1835 single-core versus 5656 multi-core. Passmark’s single-thread score of 3151 contrasts with its multithread score of 12923. This indicates that the processor scales well with multi-threaded workloads, leveraging its 10 cores and 12 threads effectively.

For everyday tasks like web browsing, document editing, and light productivity, the single-thread performance is sufficient. The 1550 R23 single-core score and 1835 Geekbench single-core score are in line with other modern mobile chips, ensuring responsive interaction. However, the multi-thread advantage is where the i5-1235U shines. Tasks such as video encoding, 3D rendering, software compilation, and data analysis benefit significantly from the 10-core layout. The Passmark data compression score of 147450 and integer math score of 48553 further confirm that multi-threaded number crunching is a strong suit. Users who regularly run parallel workloads will see a substantial speedup over dual-core or quad-core alternatives.

FAQ

Q: What is the TDP of the Intel Core i5-1235U?

A: The TDP is 15W.

Q: What socket does this processor use?

A: It uses the Intel BGA 1744 socket.

Q: Does it support DDR5 memory?

A: Yes, it supports both DDR4 and DDR5 memory, with a dual-channel memory bus.

Q: What integrated graphics does it include?

A: It features Iris Xe 80EU integrated graphics.

Q: How does it compare to the Intel Core i3-12100E?

A: The i5-1235U is effectively tied with the i3-12100E, showing a 0.0% delta in average benchmark score.

Q: When was it released?

A: It was released on February 22, 2022.

Who Should Consider It

The i5-1235U is best suited for users who need a balance of portability and multi-threaded performance in a thin-and-light laptop. Its Cinebench R23 multi-core score of 10984 makes it capable of handling light to moderate content creation, such as photo editing, video transcoding, and 3D modeling at entry levels. The Passmark data compression score of 147450 indicates that it excels at file archiving and backup tasks. For office productivity, the single-thread performance of 1550 in R23 and 1835 in Geekbench ensures snappy application launches and smooth multitasking.

Gamers should note that the integrated Iris Xe 80EU GPU is not designed for high-end gaming, but it can handle casual titles and older games at low settings. The 15W TDP means that this processor will not sustain heavy all-core loads for extended periods without thermal throttling, but for typical usage patterns, it is more than adequate. Users who frequently work with spreadsheets, databases, or programming environments will appreciate the integer math score of 48553 and the multithread score of 12923. The 75th percentile ranking suggests that it outperforms the majority of CPUs in the benchmark database, making it a reliable choice for mainstream laptops.

Platform and Compatibility

The i5-1235U is built for the Intel BGA 1744 socket, which is a soldered, non-upgradeable platform. This means the processor is permanently attached to the motherboard, so end users cannot swap it out for a newer chip. The platform supports dual-channel DDR4 and DDR5 memory, giving laptop manufacturers flexibility in memory selection. The integrated memory controller handles both types, though the actual bandwidth depends on the modules used. The processor provides 20 PCIe Gen 4 lanes from the CPU, enabling high-speed connectivity for NVMe SSDs and discrete GPUs, though the integrated graphics are the default for most thin designs.

The 10 nm process and Alder Lake architecture are modern, and the production status is listed as Active, meaning it is still in current production. The release date of February 22, 2022, places it in the early 2022 mobile lineup. Because it is a BGA part, the upgrade path is limited to the entire laptop rather than the CPU itself. However, the memory and storage are typically upgradeable, and the PCIe Gen 4 support ensures that fast SSDs will be fully utilized. For users who plan to keep a laptop for several years, the i5-1235U provides a competent foundation with balanced performance across single-threaded and multi-threaded applications.