Core i7-6660U

Details and Benchmarks for Intel Core i7-6660U

Sysbuilds Alpha Stage!

Please take all results with a big grain of salt. Sysbuilds is in alpha stage at the moment which can lead to wrong data, strange counting errors, silly results and more. This site is under active development.

Benchmark Results

Combined benchmark scores based on multiple data points, giving a quick overview of this processor's performance.

Overall Score

Overall score for Core i7-6660U based on all benchmark results gathered. Look at this like a meta score, you will find more specific workload ratings below.

5,036 Rank: 847
Rank Name Score Visual
843 Pentium G4600 5,039
+0.1%
844 Core i3-1005G1 5,038
+0%
845 Pentium G4620 5,038
+0%
846 Core i3-4330 5,037
+0%
847 Core i7-6660U 5,036
848 Ryzen 3 7320U 5,036
+0%
849 Core i7-4770HQ 5,032
-0.1%
850 Core i5-4460S 5,031
-0.1%
851 Core i7-4600M 5,031
-0.1%
852 Xeon Silver 4110 5,030
-0.1%

View full ranking →

Multicore Score

Multicore performance score for Core i7-6660U based on multi-threaded benchmark results.

4,665 Rank: 1010
Rank Name Score Visual
1006 Core i5-6300HQ 4,667
+0%
1007 Core i5-7287U 4,666
+0%
1008 Xeon E3-1290 v2 4,666
+0%
1009 Xeon E3-1505L v5 4,665
+0%
1010 Core i7-6660U 4,665
1011 Core i7-4712HQ 4,665
+0%
1012 Core i7-3632QM 4,665
+0%
1013 Core i7-950 4,664
+-0%
1014 Core i7-7567U 4,663
+-0%
1015 Xeon X5570 4,663
+-0%

View full ranking →

Singlecore Score

Single-core performance score for Core i7-6660U based on single-threaded benchmark results.

5,284 Rank: 741
Rank Name Score Visual
737 Core i5-10200H 5,286
+0%
738 Ryzen 5 2400GE 5,285
+0%
739 Core i5-4570 5,285
+0%
740 Core i3-1005G1 5,284
+0%
741 Core i7-6660U 5,284
742 Xeon Gold 5218 5,282
+-0%
743 Core i3-4350 5,282
+-0%
744 Core i7-6820HQ 5,279
-0.1%
745 Xeon E3-1230 V2 5,279
-0.1%
746 Ryzen 5 PRO 3400G 5,278
-0.1%

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Workload Scores

Performance scores grouped by workload type, normalized and aggregated from multiple raw benchmark results.

Number Crunching

Aggregated score for Core i7-6660U based on integer math, floating point math, and prime number computation benchmarks.

4,562 Rank: 1108
Rank Name Score Visual
1104 Pentium G3470 4,563
+0%
1105 A8-6500 4,563
+0%
1106 Xeon E5430 4,563
+0%
1107 Pentium Gold G5420T 4,562
+0%
1108 Core i7-6660U 4,562
1109 Xeon E5472 4,562
+0%
1110 A8-5500B 4,562
+0%
1111 Core i3-1000NG4 4,562
+0%
1112 Core i3-7100T 4,561
+-0%
1113 Core i3-4160 4,561
+-0%

View full ranking →

Data Processing

Aggregated score for Core i7-6660U based on data encryption, data compression, and string sorting benchmarks.

4,539 Rank: 1107
Rank Name Score Visual
1103 FX-9830P 4,540
+0%
1104 Phenom II X4 B40 4,540
+0%
1105 Pentium Silver J5005 4,539
+0%
1106 Pentium Gold G5500T 4,539
+0%
1107 Core i7-6660U 4,539
1108 Core i5-7300U 4,539
+0%
1109 A10-6700 4,539
+0%
1110 A8-9600 4,539
+0%
1111 A10-9700E 4,539
+0%
1112 Athlon II X4 645 4,539
+0%

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Physics & Compute

Aggregated score for Core i7-6660U based on physics simulation and extended instruction set (SSE/AVX) benchmarks.

4,613 Rank: 929
Rank Name Score Visual
925 Xeon W3670 4,615
+0%
926 Xeon D-1518 4,614
+0%
927 Ryzen 5 3500U 4,613
+0%
928 Ryzen 3 2200GE 4,613
+0%
929 Core i7-6660U 4,613
930 Core i7-2600S 4,613
+0%
931 Core i3-6300 4,612
+-0%
932 Xeon X5677 4,612
+-0%
933 Core i3-7300T 4,611
+-0%
934 Core i7-7560U 4,610
-0.1%

View full ranking →

Core i7-6660U Details

Built on Intel's Skylake microarchitecture and fabricated on a 14 nm process, the Core i7-6660U represents a mobile processor designed for thin and light laptops. Released in early 2016, it's now over eight years old, placing it firmly in the category of legacy hardware. While no longer competitive in modern high-performance computing, it was a capable dual-core part for its time, offering a blend of performance and efficiency suited to mainstream mobile workloads. As of March 2026, the i7-6660U remains relevant for basic productivity, light multimedia tasks, and entry-level computing where power consumption and thermal constraints are key concerns.

The processor features a base clock of 2.4 GHz and can boost up to 3.4 GHz on a single core, maintaining that frequency across two cores in turbo mode. It includes four threads via Intel's Hyper-Threading technology, allowing it to handle multi-threaded workloads more efficiently than a non-SMT dual-core design. With 4 MB of L3 cache and 0.5 MB of L2 cache, it provides sufficient on-die memory for its architecture, though its 64-bit x86-64 instruction set and 14 nm CMOS process reflect the state of the art from a decade ago. It operates at a TDP of 15 W, with a down-bounded 9.5 W for power-saving scenarios, and is packaged in the FCBGA-1356 socket, common in ultraportable designs.

Memory support includes DDR4-2133, LPDDR3-1866, and DDR3L-1600 at up to 32 GB, with dual-channel bandwidth reaching 31.79 GiB/s. This is complemented by integrated Intel Iris Graphics 540, which features 48 execution units and a max frequency of 1.05 GHz, enabling basic gaming and media playback. The GPU supports up to three displays and shares system memory, with a maximum of 32 GiB allocated for graphics use. Despite lacking discrete GPU power, it was capable of handling 1080p video playback and light creative tasks when paired with the right software.

The i7-6660U supports a wide array of modern instruction sets, including AVX2, AES-NI, and Intel's enhanced SpeedStep and Turbo Boost 2.0 technologies, which dynamically adjust performance based on thermal and power headroom. It also includes features like Intel VT-x, VT-d, and TXT for virtualization and security, making it suitable for light enterprise and developer use. However, it lacks ECC memory support, which limits its use in server or workstation environments.

Benchmark data reveals a balanced but modest performance profile. In single-core tests, the processor scores 5,284, placing it at #740 out of 2060, slightly trailing modern mid-tier CPUs like the Core i5-10200H and Ryzen 5 2400GE. Its multicore score of 4,665 ranks it at #1009, indicating strong scaling for its time but limited competitiveness today. The overall score of 5,036 puts it at #847, positioning it above older quad-core i7s but below contemporary mobile processors. Notably, its single-core performance is stronger relative to its multicore score, suggesting it excels in applications that rely on high clock speeds rather than parallel processing.

In the broader context of modern computing, the i7-6660U serves as a testament to Intel's mobile strategy during the mid-2010s. While it lacks the raw power of today’s 13th and 14th Gen Intel Core or Ryzen 7000 series processors, it still holds value in legacy systems, low-cost laptops, or as a budget upgrade option for users prioritizing portability and battery life over performance. For basic office work, web browsing, and media consumption, it remains functional, albeit significantly outpaced by current-generation hardware.
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Intel Core i7-6660U

Main Specifications

Designer: Intel
Name: Core i7-6660U
Family: Core
Series: i7-6000
Model Number: i7-6660U
Cores: 2
Threads: 4
Base Frequency: 2400 MHz
Turbo Frequency (1 core): 3400 MHz
Turbo Frequency (2 cores): 3400 MHz
Clock Multiplier: 24x (locked)
Microarchitecture: Skylake
Core Name: Skylake
Core Family: 6
Core Model: 78
Package: FCBGA-1356
Target Segment: Mobile
Max CPUs: 1
TDP: 15 W
Release Price: $415.00

Cache Specifications

L1 Cache: 128 KiB
L1 Instruction Cache: 64 KiB (8-way set associative)
L1 Data Cache: 64 KiB (8-way set associative)
L2 Cache: 0.5 MiB (4-way set associative)
L3 Cache: 4 MiB

Memory Specifications

Supported Memory Type: DDR4-2133 LPDDR3-1866 and DDR3L-1600
Memory Channels: 2
Maximum Memory: 32 GB
Maximum Bandwidth: 31.79 GB/s
ECC Support: No

Integrated Graphics

GPU: Iris Graphics 540
GPU Designer: Intel
GPU Max Frequency: 1050 MHz
Execution Units: 48

Physical Specifications

Process: 14 nm
Manufacturer: Intel
Technology: CMOS
Word Size: 64-bit
ISA: x86-64 (x86)

CPU Features

MMX EMMX SSE SSE2 SSE3 SSSE3 SSE4.1 SSE4.2 AVX AVX2 ABM BMI1 BMI2 FMA3 AES RdRand ADX CLMUL F16C x86-16 x86-32 x86-64 Real Protected SMM FPU NX HT TBT 2.0 EIST TXT vPro VT-x VT-d EPT MPX SGX Secure Key SMEP SIPP IPT TSX Flex Memory MWT ISRT
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