Home > CPU Comparison > Core i7 1255U or Core i5 1240P: what's better?

Intel Core i7 1255U vs i5 1240P

45 out of 100
Intel Core i7 1255U
VS
45 out of 100
Intel Core i5 1240P
Intel Core i7 1255U
Intel Core i5 1240P

We compared two laptop CPUs: the 1.7 GHz Intel Core i7 1255U with 10-cores against the 1.7 GHz i5 1240P with 12-cores. On this page, you'll find out which processor has better performance in benchmarks, games and other useful information.

  1. Review
  2. Differences
  3. Performance
  4. Specs
  5. Comments (6)

Review

General overview and comparison of the processors
Single-Core Performance
Performance in single-threaded apps and benchmarks
Multi-Core Performance
Measure performance when all cores are involved
Power Efficiency
The efficiency score of power consumption
Integrated Graphics
iGPU capabilities for gaming and 3D-intensive tasks
DeviceFacts Final Score
Choose your main usage scenario to recalculate the Final Score and see which CPU suits your needs.
πŸ”Œ Usage Scenario:

Key Differences

What are the key differences between 1240P and 1255U
Advantages of Intel Core i7 1255U
  • 7% higher Turbo Boost frequency (4.7 GHz vs 4.4 GHz)
Advantages of Intel Core i5 1240P
  • Has 2 more physical cores

Test in Benchmarks

Comparing the performance of CPUs across various tasks
CPU:
Core i7 1255U
vs
Core i5 1240P

Cinebench

Reputable cross-platform benchmark for high-performance processors
Cinebench 2024 (Single)
Cinebench 2024 (Multi)
Submit your benchmark results

GeekBench v6

The new version of this benchmark emulates common operations often used in real-world apps
Geekbench 6 (Single-Core)
Geekbench 6 (Multi-Core)
Core i7 1255U
7160
Core i5 1240P +21%
8643
File compression 626.4 MB/sec 629 MB/sec
Clang compilation 49.1 Klines/sec 61.4 Klines/sec
HTML 5 Browser 179.7 pages/sec 212.7 pages/sec
PDF Renderer 201.5 Mpixels/sec 278.2 Mpixels/sec
Text processing 217.7 pages/sec 196.2 pages/sec
Background blur 31.6 images/sec 39 images/sec
Photo processing 71.1 images/sec 76.8 images/sec
Ray tracing 9.8 Mpixels/sec 13.8 Mpixels/sec
Sources: GeekBench [1], [2] – 1162 & 536 samples

PassMark

Synthetic test that focuses on raw computational performance for low-level functions
Passmark CPU (Single-Core)
Passmark CPU (Multi-Core)
Core i7 1255U
12978
Core i5 1240P +21%
15763
Integer math 47.7 GOps/sec 60.9 GOps/sec
Floating point math 32.2 GOps/sec 41.8 GOps/sec
Find prime numbers 38M Primes/sec 44M Primes/sec
Random string sorting 16.8M Strings/sec 20.7M Strings/sec
Data encryption 9.1 GBytes/sec 10.9 GBytes/sec
Data compression 145.7 MBytes/sec 183.4 MBytes/sec
Physics 750 Frames/sec 859 Frames/sec
Extended instructions 8.2B Matrices/sec 10.6B Matrices/sec
Sources: PassMark [3], [4] – 4528 & 2088 samples

Blender

3D rendering test that measures CPU performance in 3D modeling tasks (uses all cores)
Blender CPU
Core i7 1255U
77.28
Core i5 1240P +43%
110.19

Performance Per Watt

Shows the score you get per each watt of PL1 TDP
Cinebench 2024 / Watt 29.7 PPW 17.1 PPW
Geekbench 6 Multi / Watt 477.3 PPW 308.7 PPW
Passmark CPU Mark / Watt 865.2 PPW 563 PPW
Blender / Watt 5.15 PPW 3.94 PPW
These are rough calculations, as most CPUs surpass PL1 TDP wattage even in multicore workloads.

Recent User Tests

The latest benchmark tests that have been submitted by users
Intel Core i7 1255U
DateBenchmarkResult
πŸ“˜ 2026-10-08 (dell)Geekbench 7 CPU1840 / 7197
πŸ“˜ 2026-02-13 -> Lello75Geekbench 6 CPU2315 / 7219
πŸ“˜ 2025-04-13 (kapple)Cinebench 202495 / 446
Add View all (3)
Intel Core i5 1240P
DateBenchmarkResult
πŸ“˜ 2025-11-19 (Aki)Geekbench 6 CPU2214 / 9632
πŸ“˜ 2025-11-19 (Aki)Cinebench 202498 / 523
πŸ“˜ 2025-11-16 (tg)Cinebench 202480 / 480
πŸ“˜ 2025-02-15 (Piyush)Cinebench 202465 / 88
Add View all (4)

Specifications

Full technical specification of Intel Core i7 1255U and i5 1240P

General

Vendor Intel Intel
Released February 23, 2022 February 23, 2022
Type Laptop Laptop
Instruction Set x86-64 x86-64
Codename Alder Lake Alder Lake
Model number i7-1255U i5-1240P
Integrated GPU Iris Xe Graphics (96EU) Iris Xe Graphics (80EU)
Rival Equivalent - - AMD Ryzen 5 5500U
Successor - Intel Core Ultra 7 255U - Intel Core i5 1340P
Intel CPU rating (185th and 186th place)

CPU

Performance Cores
P-Cores 2 4
P-Threads 4 8
Base Frequency (P) 1.7 GHz 1.7 GHz
Turbo Boost Frequency (P) 4.7 GHz 4.4 GHz
Efficient Cores
E-Cores 8 8
E-Threads 8 8
Base Frequency (E) 1.2 GHz 1.2 GHz
Turbo Boost Frequency (E) 3.5 GHz 3.3 GHz
Total
Total Cores 10 12
Total Threads 12 16
Bus Frequency 100 MHz 100 MHz
Multiplier 17x 17x
L1 Cache 80K (per core) 80K (per core)
L2 Cache 1280K (per core) 1280K (per core)
L3 Cache 12MB (shared) 12MB (shared)
Unlocked Multiplier No No

Package

Fabrication Process 10 nm 10 nm
TDP (PL1) 12-15 W (configurable) 20-28 W (configurable)
Max. Boost TDP (PL2) 55 W 64 W
Socket BGA-1744 BGA-1744
Peak Temperature 100Β°C 100Β°C

iGPU

Integrated Graphics Intel Iris Xe Graphics (96EU) Intel Iris Xe Graphics (80EU)
GPU Base Clock 300 MHz 300 MHz
GPU Boost Clock 1250 MHz 1300 MHz
Shading Units 768 640
TMUs 48 40
ROPs 24 20
Execution Units 96 80
TGP 15 W 15 W
iGPU FLOPS
Core i7 1255U +12%
1.9 TFLOPS
Core i5 1240P
1.7 TFLOPS
More info: Iris Xe Graphics G7 (80EU) compared to Xe Graphics G7 (96EU)

Memory Support

Memory Types - DDR5-4800
- DDR4-3200
- LPDDR5-5200
- LPDDR4x-4267		 - DDR5-4800
- DDR4-3200
- LPDDR5-5200
- LPDDR4x-4267
Max. Memory Size 64 GB 64 GB
Memory Channels 2 2
ECC Support No No

Misc

Official Site Intel Core i7 1255U official page Intel Core i5 1240P official page
PCI Express Version 4.0 4.0
PCI Express Lanes 20 20

Cast your vote

Choose between two processors
267 (35.1%)
494 (64.9%)
Total votes: 761

Competitors

1. Intel Core i7 1255U vs Intel Core i7 1355U (1)
2. Intel Core i7 1255U vs Intel Core i5 1235U (2)
3. Intel Core i7 1255U vs AMD Ryzen 7 5700U
4. Intel Core i7 1255U vs Intel Core i5 1335U (2)
5. Intel Core i7 1255U vs AMD Ryzen 7 7730U
6. Intel Core i5 1240P vs AMD Ryzen 5 7530U
7. Intel Core i5 1240P vs Intel Core i5 1335U
8. Intel Core i5 1240P vs Intel Core i5 1235U (7)
9. Intel Core i5 1240P vs Intel Core i5 12500H (2)
10. Intel Core i5 1240P vs Intel Core i5 12450H (6)
Compare other CPUs (460+)

Comments

So which CPU will you choose: Intel Core i5 1240P or i7 1255U?
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abss June 16, 2023 at 02:50 AM
Whether it's launching applications swiftly, multitasking seamlessly, or enjoying smooth multimedia playback, a 4.7GHz single-core processor offers an exceptional user experience. While a 4.4GHz processor is still highly capable, the extra speed provided by the 4.7GHz variant ensures a more snappy and efficient performance. This makes it an appealing choice for users seeking optimal speed and responsiveness in their day-to-day computing activities. That's why some people are willing to invest in an i9 for a more powerful single core.
+12 Reply
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Kots May 20, 2023 at 02:28 AM
Although the benchmarks are close, remember that the i7-1255u needs to be running at a high power profile to be close to that result, whereas the i5-1240p will naturally get closer due to the base TDP. Manufacturers tend to make the U-chip slightly more lethargic for battery saving. Also dual-core vs quad-core Performance-cores. Source: I work in IT and have owned/experienced both P and U chips. A bit of a lottery with how manufacturers implement those CPUs. I am now settled on an ultralight MSI Prestige 13Evo with a P chip and a fat 75wh battery.
+19 Reply
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Fletcher May 1, 2023 at 04:53 AM
I just bought the 1255u and its not bad, im a web developer and it does everything I need and then some
+26 Reply
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Tulasi Ram November 22, 2022 at 11:54 AM
hi, I am a data scientist, I purchased an i5 laptop with a 1240p processor from dell. I heartfully thank www.devicefacts.org which helped me in my research. From my experience, the processor is significantly faster and more efficient. so, my vote is for the 1240p processor.
+78 Reply
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root November 22, 2022 at 11:23 PM
It's nice to help you, thanks :)
+14 Reply
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Neil July 30, 2022 at 04:14 AM
Surprised at these benchmarks. Though the i5-1240p would be considerably more powerful with 2 more performance cores (double!) Seem the little 1255u at 15w vs 28w cranks out the single-threaded performance to help make up ground but loses in multicore. Could make for a reasonable budget web browsing/office type CPU for parents. I was expecting it to be a budget CPU but doesn't seem to be the case. (I also guess maybe because it's the higher clocked i7 variant for the 15w chip)
+116 Reply
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