Intel Core i7 1255U vs 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.


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
NanoReview Final Score
Generic CPU rating

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
  • 30% faster in a single-core Geekbench v6 test - 2182 vs 1681 points
  • Has 2 more physical cores

Test in Benchmarks

Comparing the performance of CPUs across various tasks

Cinebench R23

Reputable cross-platform benchmark for high-performance processors
Cinebench R23 (Single-Core)
Cinebench R23 (Multi-Core)

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)
File compression 513.4 MB/sec 744.1 MB/sec
Clang compilation 36.1 Klines/sec 57.6 Klines/sec
HTML 5 Browser 144.2 pages/sec 242 pages/sec
PDF Renderer 152.3 Mpixels/sec 267.9 Mpixels/sec
Text processing 196.7 pages/sec 197.4 pages/sec
Background blur 37.3 images/sec 35.1 images/sec
Photo processing 69.3 images/sec 83 images/sec
Ray tracing 11.9 Mpixels/sec 13.1 Mpixels/sec
Sources: GeekBench [1], [2]


Synthetic test that focuses on raw computational performance for low-level functions
Passmark CPU (Single-Core)
Passmark CPU (Multi-Core)
Integer math 51.6 GOps/sec 65.4 GOps/sec
Floating point math 34.2 GOps/sec 45.5 GOps/sec
Find prime numbers 45M Primes/sec 48M Primes/sec
Random string sorting 17.4M Strings/sec 22.9M Strings/sec
Data encryption 9.6 GBytes/sec 12 GBytes/sec
Data compression 150.3 MBytes/sec 202.3 MBytes/sec
Physics 860 Frames/sec 945 Frames/sec
Extended instructions 8.4B Matrices/sec 11.8B Matrices/sec
Sources: PassMark [3], [4]


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


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)


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 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


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 100°C 100°C


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

Memory Support

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


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
246 (40.7%)
358 (59.3%)
Total votes: 604


So which CPU will you choose: Intel Core i5 1240P or i7 1255U?
abss 16 June 2023 02:50
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.
0 Reply
Kots 20 May 2023 02:28
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.
+8 Reply
Fletcher 01 May 2023 04:53
I just bought the 1255u and its not bad, im a web developer and it does everything I need and then some
+17 Reply
Tulasi Ram 22 November 2022 11:54
hi, I am a data scientist, I purchased an i5 laptop with a 1240p processor from dell. I heartfully thank 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.
+72 Reply
Root 22 November 2022 23:23
It's nice to help you, thanks :)
+11 Reply
Neil 30 July 2022 04:14
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)
+113 Reply