Intel Core i7 1255U
Rated: 7.5/10
Intel Core i5 1335U
Rated: 8/10
Pros And Cons
| CPU | Pros | Cons |
|---|---|---|
| Core i7-1255U | ✅ Better overall value ✅ Slightly better iGPU | ❌ Lagged in overall performance ❌ Consumes more power |
| Core i5-1335U | ✅ Better overall performance ✅ Better memory support | ❌ Relatively mediocre value ❌ Worse iGPU Strength |
- The Core i5-1335U outperformed the Core i7-1255U by 14.7% in our multi-core applications and 1.6% in single-core applications. In 3DMark Time Spy and HWBOT x265 tests, the Core i7-1255U was 4.1% and 1% faster, respectively.
- Talking power draw, the Core i7-1255U produced 33.3% more heat under load than the Core i5-1335U.
- As for prices, the Core i7-1255U laptops range from $489 – $4629, while the Core i5-1335U laptops are in the $649 – $1894 price bracket.
- In our experience, the Core i7-1255U provides more performance per dollar as it’s much cheaper at a fraction of the price difference.
Core i7 1255U Vs Core i5 1335U – Comparison Table
| Mobile CPU | Core i7-1255U | Core i5-1335U |
|---|---|---|
| Codename | Alder Lake-U | Raptor Lake-U |
| Socket | BGA-1744 | BGA-1744 |
| L1 Cache | 80KB per core | 80KB per core |
| L2 Cache | 1280KB per core | 1280KB per core |
| Memory Size | Up to 64GB | Up to 64GB |
| No. of Shaders | 768 | 640 |
| No. of TMUs | 48 | 40 |
| No. of ROPs | 24 | 20 |
| No. of Execution Units | 96 | 80 |
| iGPU Theoretical Performance | 1.69 TFLOPs | 1.41 TFLOPs |
| CPU Base Power | 12-15W (configurable) | 12-15W (configurable) |
| CPU Boost Power | 55W | 55W |
| Price Range | $489 to $4629 | $649-$1894 |
| Launch Date | February 23, 2022 | January 3, 2023 |
Architectural Differences
- Processing Nodes: Both the Intel i7 1255U and the Intel i5 1335U are based on a 10nm manufacturing process, which offers identical power efficiency and potential for a similar performance.
- Clock Speeds: The Core i7-1255U clocks 1.7GHz on the P-cores and 1.2GHz on the E-cores at the base. Conversely, the Core i5-1335U has frequencies of 1.3GHz (P-cores) and 0.9 GHz (E-cores). As for boost speeds, the Core i7-1255U P-cores push up to 4.7GHz and the E-cores up to 3.5GHz. The Core i5-1335U boosts to 4.6GHz (P-cores) and 3.4GHz (E-cores).
- Cores And Threads: The Intel Core i7 1255U features 2 performance cores and 8 Efficiency cores, paired with 12 threads. On the other hand, the Intel Core i5 1335U has 2 performance cores and 8 efficiency cores, coupled with 12 threads.
- Memory: The Core i5-1335U improves DDR5 (up to 5200 MT/s over 4800 MT/s) and LPDDR5 (up to 6400 MT/s over 5200 MT/s) support. It also adds LPDDR5x support which the Core i7-1255U does not support.
- Cache: The Intel Core i7-1255U has 18MB of shared L3 Cache, while the Core i5-1335U has 12MB of it.
Previously, We compared the Core i7-1255U to the Core i5-1235U and discovered a 12.4% and 5.2% difference in multi-core and single-core performance, respectively. This article will put the slightly upgraded 13th-generation Core i5 to the same Core i7, in Core i7-1255U vs Core i5-1335U. Read on to find out if the Raptor Lake Core i5 stands a better chance.
Performance Benchmarks
I’ve compared the two CPUs in performance in various applications to find the better CPU.
Cinebench R15
- Beginning the proceedings with Cinebench R15, we witness that the Core i5-1335U scores 1494 points in the multi-core test. In response, the Core i7-1255U accumulated 1400 points.
- In the single-core test, the Core i7-1255U led with 238.5 points, while the Core i5-1335U managed 231 points.
Cinebench R23
- Moving on to Cinebench R23, the Core i5-1335U scored 8349 points, just marginally ahead of the Core i7-1255U’s 8332-point tally.
- As for the single-core scores, the Core i7-1255U leads again with 1656 points over 1625 of the Core i5-1335U.
Geekbench 5
- The next test is Geekbench 5, where the Core i5-1335U bagged another win in our multi-core performance, with 7984 points. In response, the Core i7-1255U scored 7294 points.
- The single-core results saw the Core i5-1335U scoring 1637 points compared to 1610 of the Core i7-1255U.
Passmark
- In Passmark, we analyzed that the Core i5-1335U notched up 17057 points, leading the Core i7-1255U’s score of 13905 points.
- Regarding single-core scores, the Core i5-1335U’s tally is 3505 points, while the Core i7-1255U’s figures read 3382 points.
3DMark Time Spy CPU Benchmark
- In the 3DMark Time Spy benchmark, the Core i7-1255U proved superior with 6140 points. In reply, the Core i5-1335U scored 5894 points. In exact, the Core i7-1255U performed 4.1% better.
Blender 3.3 Classroom
- The next benchmark we put to test is the Blender Classroom render, in which we saw that the Core i5-1335U rendered the scene 10 seconds faster than the Core i7-1255U — or 1.4% faster.
HWBOT x265 Benchmark V2.2
- Wrapping up the benchmarks, the Core i7-1255U outscored its Intel Core i5 competitor by just .1 FPS — or 1%.
Overall Performance
Before moving on, we calculated the average for the multi-core and single-core across the four tested applications.
- Multi-core Performance: Overall, the Core i5-1335U accumulated 8721 points while the Core i7-1255U averaged 7597 points. So, on average, the Core i5-1335U is 14.7% faster in multi-core applications.
- Single-core Performance: The Core i5-1335U averaged 1749 points across the four tests, bettering the Core i7-1255U’s score of 1721 points. Thus, the Core i5-1335U is about 1.6% faster than the Core i7-1255U in single-core applications.
Core i7 1255U vs Core i5 1335U – Final Thoughts
Intel Core i5 1335U: The Core i5-1355U performed 14.7% faster in our multi-core tests and 1.6% faster in the single-core tests. It also won the Blender render test. In the remaining tests, the Core i7-1255U performed better but by a narrow margin.
Intel Core i5 1255U: We experienced that the price gap favors Intel’s Core i7-1255U. Keep in mind its higher power consumption and potential for thermal throttling. Also, note that memory support isn’t as robust as the Core i5-1355U. However, the Core i7-1255U offers a better performance-per-dollar ratio than the Core i5-1335U.
We recommend the Intel Core i5 1335U as it has more potential and memory support than the Core i5 1255U despite having a below-par value. This performance in benchmarks greatly enhances the i5 1335U’s rating.
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[Hardware Reviewer]
Hi! I’m Ali Tauseef, and I have been writing for Tech4Gamers since 2022. I love all things computer hardware but am particularly fond of CPUs and motherboards, and I like to stay up-to-date about the latest advancements in these worlds, and when possible, write about it. When I’m not doing that, I like to get into a little FPS action in CS2 or get lost in the vast world of RDR2.
Get In Touch: ali@tech4gamers.com
