GuidesComparisonsCore i7-1255U Vs Core i5-1335U: Should You Upgrade?

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.

Previously, I 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 gen 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.

Key Takeaways

  • The Core i5-1335U outperformed the Core i7-1255U by 14.7% in 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 to $4629, while the Core i5-1335U laptops are in the $649-$1894 price bracket.
  • Overall, the Core i7-1255U provides more performance per dollar as it’s much cheaper at a fraction of the price difference.

Comparison Table

Let’s compare the specifications of the two CPUs to trace the similarities and differences.

Mobile CPU Core i7-1255U Core i5-1335U
Architecture Hybrid Core Hybrid Core
Codename Alder Lake-U Raptor Lake-U
Instruction Set x86-64 x86-64
Processing Node Intel 7 (10nm) Intel 7 (10nm)
Socket BGA-1744 BGA-1744
No. of Cores 10 (2P + 8E) 10 (2P + 8E)
No. of Threads 12 (4 + 8) 12 (4 + 8)
Base Clock
  • 1.7GHz (P-cores)
  • 1.2GHz (E-cores)
  • 1.3GHz (P-cores)
  • 0.9GHz (E-cores)
Boost Clock
  • 4.7GHz (P-cores)
  • 3.5GHz (E-cores)
  • 4.6GHz (P-cores)
  • 3.4GHz (E-cores)
L1 Cache 80KB per core 80KB per core
L2 Cache 1280KB per core 1280KB per core
L3 Cache 12MB (shared) 18MB (shared)
Memory Support
  • DDR5 up to 4800 MT/s
  • DDR4 up to 3200 MT/s
  •   LPDDR5 up to 5200 MT/s
  •    LPDDR4x up to 4267 MT/s
  •  DDR5 up to 5200 MT/s
  •   LPDDR5 up to 6400 MT/s
  • LPDDR5x up to 6400 MT/s
  • DDR4 up to 3200 MT/s
  •    LPDDR4x up to 4267 MT/s
Memory Size Up to 64GB Up to 64GB
PCIe Revision 4.0 4.0 
No. of PCIe Lanes 20 20
Overclocking Support No No
Integrated Graphics Intel Iris Xe G7 graphics Intel Iris Xe G7 Graphics
GPU Base Clock 300MHz 300MHz
GPU Boost Clock 1250MHz 1250MHz
No. of Shaders 768 640
No. of TMUs 48 40
No. of ROPs 24 20
No. of Execution Units  96 80
iGPU Theoretical 
1.69 TFLOPs 1.41 TFLOPs
Total Graphics Power 15W 15W
CPU Max Operating Temperature  100°C  100°C
CPU Base Power 12-15W (configurable) 12-15W (configurable)
CPU Boost Power 55W 55W
Price Range (July 2023) $489 to $4629 $649-$1894
Launch Date February 23, 2022 January 3, 2023

Core i7-1255U vs Core i5-1335U

Here’s an overview of the architectural differences.

Architectural Differences

  • Clock SpeedsThe Core i7-1255U clocks 1.7GHz on the P-cores and 1.2GHz on the E-cores at 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).
  • 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.

Also Read: Core i7-12700H Vs Core i7-1255U

Performance: Core i7-1255U Vs Core i5-1335U

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, 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 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.

Related: Core i7-1255U Vs Core i7-1165G7


Passmark multi-core and single-core 
Passmark (Image by Tech4Gamers)
  • In Passmark, 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

Summarizing The Multi-Core And Single-Core Performance

Before moving on, I averaged 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.

Learn: How To Benchmark Your PC/Laptop

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 is the Blender Classroom render, in which the Core i5-1335U rendered the scene 10 seconds faster than the Core i7-1255U — or 1.4% faster.

Also Read: How Much RAM Do You Need For Video Editing?

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 or 1%.

Power Consumption

Lastly, we’ll look at the average power consumption numbers.

Reminder: Both CPUs have the same base (12-15W) and boost (55W) power ratings.

Power consumption, stress and idle 
Power consumption (Image by Tech4Gamers) 
  • Idle power consumption: At idle, the Core i7-1255U averaged 6.2 watts of power consumption, almost double that of the Core i5-1335U’s figure of 3.3 watts
  • Load power consumption: Under load, the Core i7-1255U used 55.6 watts of power on average, and the Core i5-1335U used 41.7 watts. This makes the Core i5-1335U 33.3% more power-efficient under load.

Laptop Prices 

Wondering how much the laptops cost? I’ve got you covered.

Note: The prices have been estimated from Amazon US and are valid as of August 2023

  • Core i7-1255U: Entry-level laptops start from $489, while the most popular options are in the $699 to $1257 bracket. These laptops can go as high as $4629.
  • Core i5-1335U: Laptops using this mobile CPU cost $649 at the minimum, while the best-sellers will cost you between $665 and $1029. The most expensive laptops go as high as $1894.

Also Read: How Long Do Laptops Last?

Better Value: Core i5-1335U Vs Core i7-1255U

So which CPU has more value? The Core i5-1355U performed 14.7% faster in the multi-core test 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.

When we look at the prices, there is a 32.7% difference in entry-level laptop prices between the two CPUs. The price difference is greater than the performance difference.

So, the Core i7-1255U has a better performance-per-dollar ratio than the Core i5-1335U.

Final Thoughts 

This marks the end of this comparison. Despite mostly matching specifications, the Core i5-1335U comprehensively outperformed the Core i7-1255U in multi-core applications.

In single-core applications, the gap between the two CPUs was much less, and the same goes for 3DMark Time Spy, Blender, and HWBOT x265 tests. The price difference overpowered all the performance differences, giving Intel’s Core i7-1255U the value crown. 

Remember, though, that with the Core i7-1255U, you’ll be dealing with more power consumption and potentially higher chances of thermal throttling. Additionally, the memory support of the Core i7-1255U is not as good as the Core i5-1355U. 

Pros And Cons 

CPU Pros Cons
Core i7-1255U
  • Better overall value
  • Slightly better iGPU
  • Lagged behind in overall performance
  • Consumes more power
Core i5-1335U 
  • Better overall performance
  • Better memory support
  • Relatively mediocre value

Pros And Cons: Core i7-1255U vs Core i5-1335U

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.

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What started out as a love for PC gaming turned into an enthusiasm for PC tech and hardware. Ali is a high school graduate who aspires to be a dentist. On the side, Ali likes to keep up with the latest in PC tech, and write about it.


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