GuidesComparisonsCore i5 1235U Vs Core i5 1135G7: What's The Difference?

Core i5 1235U Vs Core i5 1135G7: What’s The Difference?

In this comparison we will measure the performance of the i5 1135G7 and i5 1235U in terms of architecture, synthetic and productivity benchmark scores and power efficiency.

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Despite the different names, the successor of the 1135G7 (and 1135U, for that matter) is the Core i5 1235U packaged in Intel’s newer Alder Lake architecture. It has a few key differences from its predecessor, including a smaller TDP. In this comparison of the Core i5 1235U vs Core i5 1135G7, we will measure the difference in the performance of these chips and discuss the key differences from the architectural point of view.

Key Takeaways

  • In our thorough analysis of productivity and synthetic benchmarks, the i5 1235U showcased an approximately 25% performance improvement over the 1135G7. This performance differential could impact real-world task execution for users seeking enhanced efficiency.
  • Our power consumption stress test revealed that the i5 1235U consumed approximately 23% more power compared to the 1135G7. This information is crucial for users concerned about power efficiency and thermal management, especially in laptops and portable devices.
  • Notably, the i5 1235U’s release is about a year more recent than the 1135G7. This temporal distinction could indicate advancements in architecture and technology integration, potentially influencing factors like performance, power efficiency, and compatibility with newer software and features.

Comparison Table

CPU Intel Core i5 1235U Intel Core i5 1135G7
Core Architecture Intel Alder Lake-U Intel Tiger Lake-UP3
Processing Node 10nm 10nm
Number of Cores  4 2 Performance
8 Efficiency
Number of Threads 8 12
L3 Cache 9.5MB 5MB
Base Clock Speed 0.90GHz 2.40GHz 
Boost Clock Speed 4.40GHz 4.20GHz
TDP 15W 28W
Integrated Graphics Intel Iris Xe Graphics G7 80EUs Intel Iris Xe Graphics G7 80EUs

Architectural Differences

  1. Core Count: The 1135G7 uses Intel’s older architectural philosophy, whereas the 1235U uses Intel’s newer big.LITTLE-inspired hybrid core architecture. This means the 1135G7 contains only 4 performance cores and 8 threads, whereas the 1235U has 2 performance cores and 8 efficiency cores, which total 12 threads.
  2. Frequency: The newer processor clocks lower than its predecessor at the base and outperforms it when it boosts. For exact numbers, the 1235U has a base clock of only 900MHz, whereas it boosts to up to 4.4GHz. The 1135G7, however, has a base clock of 2.4GHz, whereas it boosts up to 4.2GHz.
  3. Thermal Design Power: The Alder Lake processor has a TDP of only 15 watts, whereas the Tiger Lake processor has a TDP of about 28 watts.
  4. Processing Nodes: Both the 1135G7 and 1235U are based on the same lithography that is made up of 10nm processing nodes.
  5. L3 Cache: The 1235U almost doubles the amount of L3 cache from the 1135G7, having 9.5MB compared to 5MB on the 11th-gen processor.

Core i5 1235U Vs Core i5 1135G7: Performance Benchmarks

Having glanced over the architectural differences between the 1235U and the 1135G7, we will now measure the performance of these processors in popular synthetic and productivity benchmarks. Do note that the benchmark scores you’ll see here are a median measurement of various laptops utilizing these processors, so there might be differences in the outputs you see in the machine you go for.

Cinebench R23

Cinebench R23 Performance
Cinebench R23 Performance (Image By Tech4Gamers)
  • Starting our comparison with synthetic benchmarks, the 12th gen i5 showed its superiority in Cinebench. The single-core score of this processor triumphed over the 1135G7 by 22%. Measurements for this test on the 1235U read 1640 points, whereas the 1135G7 was quite a bit behind, scoring 1345 points.
  • Switching gears to the multi-core performance, the performance difference between these two processors grew. The i5 1235U had a performance of 6601 points thanks to its large number of cores, performance or otherwise, whereas the 1135G7 again left behind with a score of 4894 points.

Geekbench 5.4

Geekbench 5.4 Performance
Geekbench 5.4 Performance (Image By Tech4Gamers)
  • Coming over to Geekbench, it showed a smaller difference in the single-core performance between these two processors of about 12% in favor of the 1235U. The Alder Lake processor had a performance of 1546 points, whereas the 1135G7 had a lower score of around 1384 points.
  • Coming to the multi-core performance, the 1235U continued to shadow the older process, this time by about 44%. The 12th gen processor had a score of 6747, whereas the Tiger Lake processor for a score of 4688 points.

3DMark 11

3DMark 11 Performance
3DMark 11 Performance (Image By Tech4Gamers)
  • 3DMark 11 also saw a 26% improvement when we went ahead with a generation in processors. 
  • The i5 1135G7 scored about 9456 points, whereas the 1235U broke the ten thousand barrier with a score of 11915 points.


Blender Performance
Blender Performance (Image By Tech4Gamers)
  • In the Classroom render, we saw a 33% improvement when switching from the 1135G7 to the 1235U. The older processor finished the benchmark in 1254 seconds, whereas the newer i5 did it in about 846 seconds.
  • The BMW render also saw a sizeable 35% improvement between the two processors, favoring the 1235U. It had a render time of 423 seconds, whereas the 1135G7 rendered the scene in about 649 seconds.


FP32 Performance
FP32 Performance (Image By Tech4Gamers)
  • The 1135G7 scored its first victory in FP32 with a lead of about 8%, proving it has a better GPU than its successor.
  • The 1135G7 had a performance of about 1611 GFLOPS, whereas the 1235U had a performance of about 1487 GFLOPS.


7-Zip Performance
7-Zip Performance (Image By Tech4Gamers)
  • The multithreaded 7-Zip benchmark also ran unsurprisingly better on the newer processor by a margin of about 47%
  • The 1235U had a performance of 33643 MIPS, whereas the 1135G7 was very significantly behind with a performance of about 21892 MIPS.

HWBOT x265

HWBOT x265 Performance
HWBOT x265 Performance (Image By Tech4Gamers)
  • HWBOT also had a 50% lead on the 1235U at the 4k preset, despite the 1135G7 having a better iGPU. 
  • The 1135G7 had a performance of about 6 FPS, whereas the 1235U had a performance of 9 FPS.

Power Consumption

Power Consumption
Power Consumption (Image By Tech4Gamers)
  • Though the processor has a lower TDP, the 1235U drew 23% more power from the wall than the 1135G7 in our proprietary power test.
  • The 12th-gen processor had a power consumption of 52 watts compared to the 42 watts on the 1135G7.

Which One Should You Go For?

Now that we have an idea of the performance of both processors in synthetic and productivity benchmarks, this section of the Core i5 1235U vs Core i5 1135G7 will guide you on the best processor for your computing needs.

  • The 1235U is 25% faster than its previous model due to its more robust hardware.
  • The 1235U consumes more energy compared to the 1135G7, which could potentially affect its battery life.
  • The 1135G7 is considerably cheaper than the 1235U and comes with a stronger iGPU, making it a viable choice for those on a tight budget.

Pros And Cons

CPU Pros Cons
Core i5 1235U
  • Significantly better performance than the 1135G7
  • Higher power draw
  • Worse iGPU
Core i5 1135G7
  • Better integrated GPU 
  • A lower price than the 1235U
  • Significantly lesser performance than the 1235U

Frequently Asked Questions

What does the G7 in 1135G7 represent?

The G7 at the end of the 1135G7 means that it has the highest graphics level available for the 11th gen mobile chips.

Why does the iGPU of the 1235U perform worse than the one on the 1135G7 whilst it is the same graphics unit?

The 1235U has to share a lower power budget with its GPU, which is why it is clocked lower, leading to lower performance.

Does the i5 1235U uses an updated socket?

Yes, the 1235U has a BGA1744 socket rather than the BGA1449 socket found on the 1135G7.

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