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
Measure performance when all cores are involved
Power Efficiency
The efficiency score of electricity consumption
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
  • Has 2 more physical cores


Comparing the performance of CPUs in benchmarks
Cinebench R23 (Single-Core)
Cinebench R23 (Multi-Core)
Passmark CPU (Single-Core)
Passmark CPU (Multi-Core)
Geekbench 5 (Single-Core)
Geekbench 5 (Multi-Core)
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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
Socket BGA-1744 BGA-1744
TDP 12-15 W (configurable) 20-28 W (configurable)
Max. Boost TDP 55 W 64 W
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
187 (48.3%)
200 (51.7%)
Total votes: 387


So which CPU will you choose: Intel Core i5 1240P or i7 1255U?
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.
+33 Reply
Root 22 November 2022 23:23
It's nice to help you, thanks :)
0 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)
+65 Reply