GuidesComparisonsCore i7 1355U Vs Core i7 12700H: Performance Test

Core i7 1355U Vs Core i7 12700H: Performance Test

This comparison will measure the performance and power draw of the i7 1355U and the i7 12700H whilst discussing the differences in their architecture and power consumption as well.

Though people think Moore’s law is dead, the recent innovation in technology is giving CPUs substantial boosts in performance year over year. To test the extent of this boost, we decided to compare the Core i7 1355U vs Core i7 12700H to see how a generation newer processor made for thin-and-light machines stacks up to a processor made for mobile workstations and gaming beasts from a year ago.

Key Takeaways

  • While the Core i5 1355U was designed for thin and light laptops, the 12700H was crafted with a focus on productivity and gaming laptops, catering to different usage scenarios and priorities.
  • However, it’s essential to note that the H-series chip’s power draw was more than double that of the 1355U, indicating a trade-off between performance and power efficiency.
  • Summing up our testing, the i7 12700H exhibited a significant 37% performance boost compared to the 1355U.

Comparison Table

CPU Intel Core i7 1355U Intel Core i7 12700H
Core Architecture Intel Raptor Lake-U Intel Alder Lake-S
Processing Node 10nm 10nm
Number of Cores  2 performance
8 efficiency 
6 performance 
8 efficiency 
Number of threads 12 20
L3 Cache 12MB 24MB
Base Clock Speed 1.20GHz 1.70GHz 
Boost Clock Speed 5.00GHz 4.70GHz
Thermal Design Power 15W 45W
Integrated Graphics Intel Iris Xe Graphics G7 96EUs Intel Iris Xe Graphics G7 96EUs
Recommended Consumer Price $469 $502

Architectural Differences

  1. Core Count: The 12th-gen processor uses 6 performance cores and 8 efficiency cores, whilst the 1355U matches the number of efficiency cores while reducing the rest to 2 performance cores. This allows the 12700H to have a total of 20 threads, whereas the 1355U has 12 threads.
  2. Clock Speeds: Surprisingly, the 1355U has a higher boost frequency than its older cousin. It has a base clock of 1.20GHz, which can boost up to 5.00GHz. In contrast, the 12700H has a base frequency of 1.70GHz, which can boost up to 4.70GHz.
  3. Thermal Design Power: The 1355U has a modest TDP of 15 watts, whereas the 12700H has a three times larger TDP of 45 watts.
  4. L3 Cache: The 12700H also doubles the amount of L3 cache from the 1355U, upgrading its 12MB to 24MB.
  5. Lithography: Amongst the sea of differences between these two processors, they are based on the same 10nm manufacturing process.

Also Read: Core i7 12700H Vs Ryzen 7 7840U

Core i7 1355U Vs Core i7 12700H: Performance Benchmarks

Now that we’ve gotten the hardware specifications of these processors out of the way, it is time to move on to the performance benchmarks. 

Note: The performance results presented in this comparison are based on testing a range of laptops with these processors and may not reflect the exact performance of your own device. However, you can use these numbers to compare the performance difference between the two chips.

Cinebench R23

Cinebench R23 Performance
Cinebench R23 Performance (Image By Tech4Gamers)
  • The i7 1355U kicks off this comparison with a 2% lead of performance than the 12700H in terms of single core performance in Cinebench R23. The newer chip had a performance of 1811 points, whereas the 12th gen processor had a performance of 1779 points.
  • As expected, the 12700H bested its younger cousin in terms of multi-core performance by quite a large margin of 72%. The 12700H had a performance of 16308 points, whereas the 1355U had a performance of 9509 points.

Similar Read: Ryzen 7 6800H Vs Core i7 12700H

Geekbench 5.4

Geekbench 5.4 Performance
Geekbench 5.4 Performance (Image By Tech4Gamers)
  • The findings of our previous test were confirmed in Geekbench, with the 1355U having a 2% lead again against the single-core performance of the 12700H. It had a score of 1773 points, whereas the 12700H had a lower performance of 1711 points.
  • The multi-core score of this test also affirmed our previous findings; the 12700H was 41% ahead of 1355U. The more powerful chip scored 12110 points, whereas the 1355U had a score of only 8606 points.


7-Zip Performance
7-Zip Performance (Image By Tech4Gamers)
  • The multi-threaded run of 7-Zip benefited from the extra horsepower offered by the cores of the 12700H, giving it a 59% advantage over the more recent processor in this test.
  • The 12700H had a great performance of 62149 points, whereas the 1355U was a lot more modest with a score of 39166 points.

Similar Comparison: Core i7 13700H Vs Core i7 12700H

HWBOT x265

HWBOT x265 Performance
HWBOT x265 Performance (Image By Tech4Gamers)
  • This test also confirmed that more cores equal more performance for the 12700H, giving it a 64% leverage over the 1355U.
  • The 1355U had an output of 9 FPS on the 4k preset, whereas the test ran smoother on the 12700H, giving an output of 15 FPS.


Blender Performance
Blender Performance (Image By Tech4Gamers)
  • Continuing the 12700H dunking on the 1355U in productivity tests, the Classroom render in Blender finished 82% sooner than the 1355U. It took 388 seconds to render on the 12th-gen processor, whilst the 13th-gen 1355U took 709 seconds to spit out the same scene.
  • The BMW render finished about twice as soon on the 12700H compared to the 1355U. It took 213 seconds on the H-series chip, whereas the 1355U took about 414 seconds for its render.

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

3DMark 11

3DMark 11 Performance
3DMark 11 Performance (Image By Tech4Gamers)
  • The whitewash in performance continued in 3DMark 11, where the 12700H was about 49% more performant than its U-series cousin. 
  • The lower-powered chip had a performance of 14236 points, whereas the 12700H had a performance of 21707 points.


FP32 Performance
FP32 Performance (Image By Tech4Gamers)
  • The higher power budget for the processor on the 12700H translates to its iGPU also performing 7.5% better than the 1355U.
  • According to our FP32 test, the iGPU on the 1355U had a performance of 1993 GFLOPS, whereas the 12700H had a performance of 2146 GFLOPS.

Power Consumption

Power Consumption
Power Consumption (Image By Tech4Gamers)
  • As expected, the 12700H had to pay a price for its better performance. It drew over 2 times the power of the 1355U in our Cinebench R15 test with an external monitor.
  • The 1355U had a power consumption of about 57 watts, whereas the 12700H had a power consumption closer to 133 watts.

Core i7 12700H Vs Core i7 1355U: Which One Should You Go For?

This comparison section will guide you on which processor to choose based on your work case.

  • If you value battery life and are not a heavy user, choose the Core i7 1355U. It was made with thin and light machines in mind and offered enough performance for everyday tasks.
  • The 12700H is a better choice for heavy users as it usually comes in more performant machines, though battery life can be inconvenient.
  • The Core i7 12700H is a year older than the 1355U, so buying laptops with this processor is unwise unless the price is heavily discounted. If you are worried about the age of your processor, we recommend reading our guide on the longevity of laptops.

Pros And Cons

CPU Pros Cons
Core i7 1355U
  • Lower power draw
  • More recent 
  • Significantly worse performance
Core i7 12700H
  • Significantly better performance
  • Worse power draw
  • Old age

Frequently Asked Questions

Why is the 1355U so much weaker than the 12700H despite being a newer i7?

All mobile i7s are not made the same. The 1355U is part of the ultra-low-power U-series processors from Intel that focus on power efficiency rather than performance.

What is the fasted memory that the i7 1355U supports?

The i7 1355U can support 6400 MT/s memory speeds, provided the RAM is LPDDR5x memory.

How many displays does the Core i7 12700H support?

The Core i7 12700H is listed to support up to 4 monitors, including the one integrated into your laptop.

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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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