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Core i7 1255U vs Core i5 1335U – Should You Upgrade?

We compare the Core i7-1255U and Core i5-1335U in terms of specs and architectural differences, and find out how they perform in productivity benchmarks.

Expert Verified By

Intel Core i7 1255U

Rated: 7.5/10

Intel Core i5 1335U

Rated: 8/10

Pros And Cons

Core i7-1255Uβœ… Better overall value
βœ… Slightly better iGPU
❌ Lagged in overall performance
❌ Consumes more power
Core i5-1335UΒ βœ… Better overall performance
βœ… Better memory support
❌ Relatively mediocre value
❌ Worse iGPU Strength

Key Takeaways
  • 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 CPUCore i7-1255UCore i5-1335U
CodenameAlder Lake-URaptor Lake-U
L1 Cache80KB per core80KB per core
L2 Cache1280KB per core1280KB per core
Memory SizeUp to 64GBUp to 64GB
No. of Shaders768640
No. of TMUs4840
No. of ROPs2420
No. of Execution Units9680
iGPU Theoretical Performance1.69 TFLOPs1.41 TFLOPs
CPU Base Power12-15W (configurable)12-15W (configurable)
CPU Boost Power55W55W
Price Range$489 to $4629$649-$1894
Launch DateFebruary 23, 2022January 3, 2023

Architectural Differences

  1. 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.
  2. Clock SpeedsThe 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).
  3. 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.
  4. 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. 
  5. 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

Cinebench R15 multi-core and single-core
Cinebench R15 (Image by Tech4Gamers)
  • 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

Cinebench R23 multi-core and single-core
Cinebench R23 (Image by Tech4Gamers)
  • 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

Geekbench 5 multi-core and single-core 
Geekbench 5 (Image by Tech4Gamers)
  • 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 multi-core and single-core 
Passmark (Image by Tech4Gamers)
  • 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

3DMark Time Spy CPU Benchmark 
3DMark Time Spy (Image by Tech4Gamers)
  • 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

Blender 3.3 Classroom render 
Blender 3.3 Classroom (Image by Tech4Gamers)
  • 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 β€” or 1.4% faster.

HWBOT x265 Benchmark V2.2

HWBOT x265 4K Benchmark V2.2
HWBOT x265 4K Benchmark (Image by Tech4Gamers)
  • Wrapping up the benchmarks, the Core i7-1255U outscored its Intel Core i5 competitor by just .1 FPS β€” or 1%.

Overall Performance

Before moving on, we calculated the average for the multi-core and single-core across the four tested applications.

Average multi-core and single-core scores
Overall performance (Image by Tech4Gamers) 
  • 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.

Frequently Asked Questions

Which CPU has faster integrated graphics: Core i7-1255U or Core i5-1335U?

Both CPUs have the Intel Iris Xe G7 iGPU. However, the one used in the Core i7-1255U has more execution units for faster processing power. In theoretical performance, this iGPU is faster than the Core i5-1335U’s integrated GPU.

How does the memory support of Core i5-1335U differ from the Core i7-1255U?

The Core i5-1335U supports faster speeds of DDR5 and LPDDR5 memory. In addition, it supports LPDDR5x memory, which the Core i7-1255U does not.

What’s the difference in cache capacity between the Core i7-1255U and Core i5-1335U?

The Core i5-1335U has 18MB of L3 cache compared to 12MB of the Core i7-1255U.

More From Core i7 1255U:

More From Core i5 1335U:

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