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Intel Core i7-8665U vs Intel Core i5-6600

Last updated: 2026-07-03

Table of Contents

Summary
Benchmarks
Specifications
User Reviews
Popular Comparisons

Summary

Benchmarks

Performance Overview
Average performance across multiple benchmarks

Single-core performance

Rank 1 - 100 %

Intel Core i7-8665U

Rank 2 - 87 %

Intel Core i5-6600

Multi-core performance

Rank 1 - 100 %

Intel Core i7-8665U

Rank 2 - 93 %

Intel Core i5-6600

Geekbench 6 Single-Core
Single-core performance

4C / 8T · 4.80 GHz

1,437

4C / 4T · 3.90 GHz

1,278

Geekbench 6 Multi-Core
Multi-core performance

4C / 8T · 2.80 GHz

3,732

4C / 4T · 3.60 GHz

3,648

Cinebench R20 Single-Core
Single-core performance

4C / 8T · 4.80 GHz

464 cb

4C / 4T · 3.90 GHz

381 cb

Geekbench 5, 64bit Single-Core
Single-core performance

4C / 8T · 4.80 GHz

1,127

4C / 4T · 3.90 GHz

966

Cinebench R20 Multi-Core
Multi-core performance

4C / 8T · 2.80 GHz

1,536 cb

4C / 4T · 3.60 GHz

1,411 cb

Geekbench 5, 64bit Multi-Core
Multi-core performance

4C / 8T · 2.80 GHz

3,314

4C / 4T · 3.60 GHz

3,167

iGPU - FP32 Performance (Single-precision GFLOPS)

Intel UHD Graphics 620

442

Intel HD Graphics 530

442

CPU-Z Benchmark 17 Multi-Core
Multi-core performance

4C / 8T · 1.90 GHz

1,960

4C / 4T · 3.30 GHz

1,586

Cinebench R15 (Single-Core)
Single-core performance

4C / 8T · 4.80 GHz

178 cb

4C / 4T · 3.90 GHz

166 cb

Cinebench R15 (Multi-Core)
Multi-core performance

4C / 8T · 2.80 GHz

604 cb

4C / 4T · 3.60 GHz

597 cb

More benchmarks

Cinebench 2026 (ST)
218 entries

Cinebench 2026 (MC)
219 entries

Cinebench R23 (SC)
690 entries

Cinebench R23 (MC)
665 entries

Geekbench 6 (SC)
1,989 entries

Geekbench 6 (MC)
1,927 entries

Cinebench R20 (SC)
666 entries

Geekbench 5 (SC)
2,512 entries

Cinebench R20 (MC)
615 entries

Geekbench 5 (MC)
2,483 entries

FP32 SP (iGPU)
2,219 entries

PassMark CPU-Mark
2,504 entries

Blender 2.81 (bmw27)
190 entries

CPU-Z Benchmark 17 (MC)
751 entries

V-Ray CPU-Render
251 entries

Cinebench R15 (SC)
1,113 entries

Cinebench R15 (MC)
1,110 entries

Geekbench 3 (SC)
945 entries

Geekbench 3 (MC)
941 entries

Cinebench R11.5 (SC)
826 entries

Cinebench R11.5 (MC)
837 entries

Cinebench R11.5 iGPU
383 entries

Specifications

At a glance

Wischen	Intel Core i7-8665U	Intel Core i5-6600
Family	Intel Core i7 (300)	Intel Core i5 (336)
CPU group	Intel Core i 8000U (WL) (8)	Intel Core i 6000 (24)
Architecture	Whiskey Lake U	Skylake S
Technology	14 nm	14 nm
Segment	Notebook	Desktop
Socket	BGA 1356	LGA 1151
Predecessor
Successor		Intel Core i5-7600

CPU Cores and Base Frequency

Wischen	Intel Core i7-8665U	Intel Core i5-6600
CPU Cores / Threads	4 / 8	4 / 4
Hyperthreading / SMT	✓	✗
Core architecture	normal	normal
Cores:	4x	4x
Frequency:	1.90 GHz	3.30 GHz
Turbo (1 Core):	4.80 GHz	3.90 GHz
Turbo (All Cores):	2.80 GHz	3.60 GHz
L2-Cache
L3-Cache	8.00 MB	6.00 MB
Overclocking	✗	✗

Integrated graphics (iGPU)

Wischen	Intel Core i7-8665U	Intel Core i5-6600
GPU name	Intel UHD Graphics 620	Intel HD Graphics 530
GPU frequency	0.30 - 1.15 GHz	0.35 - 1.15 GHz
CUs / Shader	24 / 192	24 / 192
Raytracing	✗	✗
Max. displays	3	3
Max. GPU Memory	16 GB	32 GB
Technology	14 nm	14 nm
Release date	Q3/2016	Q3/2015

NPU AI performance

Wischen	Intel Core i7-8665U	Intel Core i5-6600
AI hardware
AI specifications
NPU + CPU + iGPU

Memory & PCIe

Wischen	Intel Core i7-8665U	Intel Core i5-6600
Memory	DDR4-2400 (38.4 GB/s)	DDR4-2133 (34.1 GB/s) DDR3-1600 (25.6 GB/s)
Max. Memory	64 GB	64 GB
Memory channels	2	2
ECC	No	No
PCIe	3.0 x 16	3.0 x 16
PCIe Bandwidth	15.8 GB/s	15.8 GB/s

Thermal Management

Wischen	Intel Core i7-8665U	Intel Core i5-6600
TDP	15 W	65 W
TDP (PL2)
TDP up	25 W
TDP down	10 W
T. junction max.	100 °C

Technical details

Wischen	Intel Core i7-8665U	Intel Core i5-6600
Chip design	Monolithic	Monolithic
AES-NI	✓	✓
Operating systems	Windows 10, Windows 11, Linux	Windows 10, Linux
Instruction set	x86-64 (64 bit)	x86-64 (64 bit)
ISA extensions	SSE4.1, SSE4.2, AVX2	SSE4.1, SSE4.2, AVX2
Release date	Q2/2019	Q3/2015
Release price	409 $	250 $
Documents	Technical data sheet	Technical data sheet

User Reviews

Your rating

Here you can rate one or both of the processors. The average rating of Intel Core i7-8665U is 4.2 stars (36 ratings), while Intel Core i5-6600 has received 4.3 stars (27 ratings).

Click on the stars to rate one or both processors.

Intel Core i7-8665U
4C / 8T · 1.90 - 4.80 GHz

★★★★★

Intel Core i5-6600
4C / 4T · 3.30 - 3.90 GHz

★★★★★