Home > CPU Comparison > Core i7 1355U or Ryzen 7 7840U: what's better?

Intel Core i7 1355U vs AMD Ryzen 7 7840U

49 out of 100
Intel Core i7 1355U
VS
57 out of 100
AMD Ryzen 7 7840U
Intel Core i7 1355U
AMD Ryzen 7 7840U

We compared two laptop CPUs: the 1.7 GHz Intel Core i7 1355U with 10-cores against the 3.3 GHz AMD Ryzen 7 7840U with 8-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

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
NanoReview 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 7840U and 1355U
Advantages of Intel Core i7 1355U
  • Has 2 more physical cores
Advantages of AMD Ryzen 7 7840U
  • Supports up to 256 GB DDR5-5600 RAM
  • More modern manufacturing process – 4 versus 10 nanometers
  • More powerful Radeon 780M integrated graphics: 4.1 vs 2 TFLOPS
  • Has 4 MB larger L3 cache size
  • 2% higher Turbo Boost frequency (5.1 GHz vs 5 GHz)

Test in Benchmarks

Comparing the performance of CPUs across various tasks
CPU:
Core i7 1355U
vs
Ryzen 7 7840U

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 1355U
7553
Ryzen 7 7840U +42%
10726
File compression 519.7 MB/sec 1110 MB/sec
Clang compilation 58.7 Klines/sec 82.2 Klines/sec
HTML 5 Browser 159 pages/sec 210.4 pages/sec
PDF Renderer 219.7 Mpixels/sec 298.4 Mpixels/sec
Text processing 221.5 pages/sec 250.6 pages/sec
Background blur 33.4 images/sec 47.5 images/sec
Photo processing 64.2 images/sec 90.5 images/sec
Ray tracing 12.5 Mpixels/sec 17.5 Mpixels/sec
Sources: GeekBench [1], [2] – 653 & 1087 samples

PassMark

Synthetic test that focuses on raw computational performance for low-level functions
Passmark CPU (Single-Core)
Passmark CPU (Multi-Core)
Core i7 1355U
13850
Ryzen 7 7840U +76%
24383
Integer math 50.4 GOps/sec 89.3 GOps/sec
Floating point math 33.9 GOps/sec 50.9 GOps/sec
Find prime numbers 48M Primes/sec 79M Primes/sec
Random string sorting 17.2M Strings/sec 33.5M Strings/sec
Data encryption 9.6 GBytes/sec 17.4 GBytes/sec
Data compression 152.3 MBytes/sec 282.7 MBytes/sec
Physics 844 Frames/sec 1245 Frames/sec
Extended instructions 8.5B Matrices/sec 20B Matrices/sec
Sources: PassMark [3], [4] – 3976 & 551 samples

Blender

3D rendering test that measures CPU performance in 3D modeling tasks (uses all cores)
Blender CPU
Core i7 1355U
94.87
Ryzen 7 7840U +110%
199.52

Performance Per Watt

Shows the score you get per each watt of PL1 TDP
Cinebench 2024 / Watt 33.9 PPW 24.3 PPW
Geekbench 6 Multi / Watt 503.5 PPW 357.5 PPW
Passmark CPU Mark / Watt 923.3 PPW 812.8 PPW
Blender / Watt 6.32 PPW 6.65 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 1355U
DateBenchmarkResult
πŸ“˜ 2026-04-28 (Linode)Geekbench 6 CPU2435 / 7355
Add View all (1)
AMD Ryzen 7 7840U
DateBenchmarkResult
πŸ“˜ 2025-08-03 (Aaron)Cinebench 202493 / 764
πŸ“˜ 2025-03-15 (JP)Cinebench 202496 / 728
Add View all (2)

Specifications

Full technical specification of Intel Core i7 1355U and AMD Ryzen 7 7840U

General

Vendor Intel Amd
Released January 3, 2023 May 3, 2023
Type Laptop Laptop
Instruction Set x86-64 x86-64
Codename Raptor Lake Zen 4 (Phoenix)
Model number i7-1355U -
Integrated GPU Iris Xe Graphics (96EU) Radeon 780M
Rival Equivalent - - Intel Core i7 1370P
Successor - Intel Core Ultra 7 255U - AMD Ryzen 7 250
Intel CPU rating (#160th place)
AMD Ryzen CPU ranking (#82nd place)

CPU

Performance Cores
P-Cores 2 8
P-Threads 4 16
Base Frequency (P) 1.7 GHz 3.3 GHz
Turbo Boost Frequency (P) 5 GHz 5.1 GHz
Efficient Cores
E-Cores 8 -
E-Threads 8 -
Base Frequency (E) 1.2 GHz -
Turbo Boost Frequency (E) 3.7 GHz -
Total
Total Cores 10 8
Total Threads 12 16
Bus Frequency 100 MHz 100 MHz
Multiplier 17x 33x
L1 Cache 80K (per core) 64K (per core)
L2 Cache 1280K (per core) 1MB (per core)
L3 Cache 12MB (shared) 16MB (shared)
Unlocked Multiplier No No

Package

Transistors - 25 billions
Fabrication Process 10 nm 4 nm
TDP (PL1) 12-15 W (configurable) 15-30 W (configurable)
Max. Boost TDP (PL2) 55 W -
Socket BGA-1744 FP8
Peak Temperature 100Β°C 100Β°C

iGPU

Integrated Graphics Intel Iris Xe Graphics (96EU) Radeon 780M
GPU Base Clock 300 MHz 800 MHz
GPU Boost Clock 1300 MHz 2700 MHz
Shading Units 768 768
TMUs 48 48
ROPs 24 32
Execution Units 96 12
TGP 15 W 15 W
iGPU FLOPS
Core i7 1355U
2 TFLOPS
Ryzen 7 7840U +105%
4.1 TFLOPS
More info: Radeon 780M compared to Iris Xe Graphics G7 (96EU)

Memory Support

Memory Types - DDR5-5200
- DDR4-3200
- LPDDR5-6400
- LPDDR5x-6400
- LPDDR4x-4267		 - DDR5-5600
- LPDDR5x-7500
Max. Memory Size 96 GB 256 GB
Memory Channels 2 2
ECC Support No No

Misc

Official Site Intel Core i7 1355U official page AMD Ryzen 7 7840U official page
PCI Express Version 4.0 4.0
PCI Express Lanes 20 20

Cast your vote

Choose between two processors
5 (5.6%)
85 (94.4%)
Total votes: 90

Competitors

1. AMD Ryzen 7 7840U vs Intel Core Ultra 7 155H (3)
2. AMD Ryzen 7 7840U vs AMD Ryzen 7 8840U (4)
3. Intel Core i7 1355U vs Intel Core Ultra 7 155U (1)
4. Intel Core i7 1355U vs Intel Core 7 150U (2)
5. Intel Core i7 1355U vs Intel Core i7 1255U (1)
6. Intel Core i7 1355U vs AMD Ryzen 5 7530U
7. Intel Core i7 1355U vs AMD Ryzen 7 7730U
8. Intel Core i7 1355U vs Intel Core i5 1335U
9. Intel Core i7 1355U vs Intel Core i7 13700H (1)
10. Intel Core i7 1355U vs Intel Core Ultra 7 155H
Compare other CPUs (460+)

Comments

So which CPU will you choose: AMD Ryzen 7 7840U or Intel Core i7 1355U?
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