Intel Core i7-7660U vs Intel Core i7-7Y75

Intel Core i7-7660U

► remove Intel 7660U

The Intel Core i7-7660U is a fast dual-core SoC for notebooks and Ultrabooks based on the Kaby Lake architecture and was announced in January 2017. The CPU has two processor cores clocked at 2.5-4 GHz (two cores up to 3.8 GHz). The processor can execute up to four threads simultaneously thanks to Hyper Threading. It is also equipped with an Intel Iris Plus Graphics 640 GPU with 64 MB eDRAm, a dual-channel memory controller (DDR4) as well as VP9 and H.265 video decoding as well as encoding. The chip is still manufactured in a 14nm process with FinFET transistors.

Compared to the Core i7-7600U, the 7660 does have a higher single-core Turbo of 4 GHz (+100 MHz), but a lower dual-core Turbo (-100 MHz) and a lower base frequency (-300 MHz). However, the CPU part can also use the 64 MB eDRAM as L5 cache.

Architecture

Intel basically uses the same micro architecture compared to Skylake, so the per-MHz performance does not differ. The manufacturer only reworked the Speed Shift technology for faster dynamic adjustments of voltages and clocks, and the improved 14nm process allows much higher frequencies combined with better efficiency than before.

Performance

At 2.5-4 GHz, the Core i7-7660U has a slightly lower frequency (except for the single-core Turbo) compared to the Core i7-7600U, but the CPU part can also use the 64 MB eDRAM, so the performance should be similar.

Graphics

The integrated Intel Iris Plus 640 Graphics is the GT3e model of the Kaby Lake GPU (Intel Gen. 9.5). It has 48 Execution Units running at 300-1050 MHz and the performance is comparable to a GeForce 920MX thanks to fast eDRAM cache. However, there aren't any significant improvements compared to the old Iris Pro 540, so modern games can often not be played smoothly or only at the lowest or medium settings, respectively.

Contrary to Skylake, Kaby lake now also supports H.265/HEVC Main 10 with a 10-bit color depth as well as Google's VP9 codec. The dual-core Kaby Lake processors announced in January should also support HDCP 2.2.

Power Consumption

The chip is manufactured in an improved 14nm process with FinFET transistors, which improves the efficiency even further. Intel still specifies the TDP with 15 Watts, which is typical for ULV chips. Depending on the usage scenario, the TDP can vary between 7.5 (cTDP Down) and 25 Watts.

Intel Core i7-7Y75

► remove Intel 7Y75

The Intel Core i7-7Y75 is a very efficient dual-core SoC for tablets and passively cooled notebooks based on the Kaby Lake architecture and was announced in the end of August 2016. The CPU consists of two processor cores clocked at 1.3-3.6 GHz (2-core Turbo not specified yet). Thanks to Hyper Threading, the processor can execute up to four threads simultaneously. The chips also includes the Intel HD Graphics 615 GPU, a dual-channel memory controller (DDR3L/LPDDR3) as well as VP9 and H.265 video de- and encoder. It is still produced in a 14 nm process with FinFET transistors. 

Architecture

Intel basically used the familiar micro architecture from the Skylake generation, so the per-MHz performance is identical. Only the Speed-Shift technology for faster dynamic adjustments of the voltages and clocks was improved, and the matured 14 nm process now also enables much higher frequencies and better efficiency than before. 

Performance

Despite the changed designation, the Core i7-7Y75 is the successor to the Core m7-6Y75 (Skylake Y-series), so the chip does not reach the performance level of other Core i processors due to the lower TDP. Thanks to its high Turbo clock, the 7Y75 can sometimes keep up with the 15 Watt models for short peak load and single-thread scenarios, but the clocks will drop significantly under sustained workloads. The CPU is still suitable for many more demanding applications as well as multitasking. 

Graphics

The integrated Intel HD Graphics 615 GPU has 24 Execution Units (EUs) like the old HD Graphics 515 and runs with clocks between 300 and 1050 MHz in combination with this processor. The performance heavily depends on the TDP limit as well as the memory configuration; with fast LPDDR3-1866 RAM in dual-channel mode, the GPU should sometimes be able to compete with the HD Graphics 520, but can also be much slower in other scenarios. Modern games from 2016 will, if at all, only run smoothly in the lowest settings.

Contrary to Skylake, Kaby Lake now also supports hardware decoding for H.265/HEVC Main10 with a 10-bit color depth as well as Google's VP9 codec.

Power Consumption

The chip is manufactured in an improved 14 nm process with FinFET transistors, so the power efficiency was once again improved significantly. The typical TDP for the Y-series is specified at 4.5 Watts, and can be adjusted in both directions depending on the usage scenario.

Intel Core i7-7660UIntel Core i7-7Y75
Intel Core i7Intel Core i7
Kaby LakeKaby Lake
: Core i7 Kaby Lake
Intel Core i7-7920HQ (compare)3100 - 4100 MHz4 / 88 MB
Intel Core i7-7820HQ (compare)2900 - 3900 MHz4 / 88 MB
Intel Core i7-7820HK (compare)2900 - 3900 MHz4 / 88 MB
Intel Core i7-7700HQ (compare)2800 - 3800 MHz4 / 86 MB
Intel Core i7-7567U (compare)3500 - 4000 MHz2 / 44 MB
» Intel Core i7-7660U2500 - 4000 MHz2 / 44 MB
Intel Core i7-7600U (compare)2800 - 3900 MHz2 / 44 MB
Intel Core i7-7560U (compare)2400 - 3800 MHz2 / 44 MB
Intel Core i7-7500U (compare)2700 - 3500 MHz2 / 44 MB
Intel Core i7-7Y751300 - 3600 MHz2 / 44 MB
Intel Core i7-7920HQ (compare)3100 - 4100 MHz4 / 88 MB
Intel Core i7-7820HQ (compare)2900 - 3900 MHz4 / 88 MB
Intel Core i7-7820HK (compare)2900 - 3900 MHz4 / 88 MB
Intel Core i7-7700HQ (compare)2800 - 3800 MHz4 / 86 MB
Intel Core i7-7567U (compare)3500 - 4000 MHz2 / 44 MB
Intel Core i7-7660U2500 - 4000 MHz2 / 44 MB
Intel Core i7-7600U (compare)2800 - 3900 MHz2 / 44 MB
Intel Core i7-7560U (compare)2400 - 3800 MHz2 / 44 MB
Intel Core i7-7500U (compare)2700 - 3500 MHz2 / 44 MB
» Intel Core i7-7Y751300 - 3600 MHz2 / 44 MB
2500 - 4000 MHz1300 - 3600 MHz
128 KB128 KB
512 KB512 KB
4 MB4 MB
2 / 42 / 4
15 4.5
14 14
100 °C100 °C
BGA1356BGA
Dual-Channel DDR4 Memory Controller, HyperThreading, AVX, AVX2, Quick Sync, Virtualization, AES-NIDual-Channel DDR3L-1600/LPDDR3-1866 Memory Controller, HyperThreading, AVX, AVX2, Quick Sync, Virtualization, AES-NI, vPro, TXT
iGPUIntel Iris Plus Graphics 640 (300 - 1050 MHz)Intel HD Graphics 615 (300 - 1050 MHz)
$415 U.S.$393 U.S.
Intel Core i7 7Y75

Cinebench R15 - CPU Multi 64Bit
min: 397     avg: 403.5     median: 403.5 (9%)     max: 410 Points
min: 236     avg: 251.3     median: 258 (6%)     max: 260 Points
Cinebench R15 - CPU Single 64Bit
min: 154     avg: 158.5     median: 158.5 (73%)     max: 163 Points
min: 121     avg: 125.7     median: 126 (58%)     max: 130 Points
Cinebench R11.5 - CPU Multi 64Bit
min: 4.39     avg: 4.5     median: 4.5 (17%)     max: 4.55 Points
min: 2.87     avg: 2.9     median: 2.9 (11%)     max: 2.98 Points
Cinebench R11.5 - CPU Single 64Bit
min: 1.84     avg: 1.9     median: 1.9 (76%)     max: 1.89 Points
min: 1.44     avg: 1.5     median: 1.5 (61%)     max: 1.54 Points
Cinebench R10 - Rendering Single 32Bit
min: 6126     avg: 6169.5     median: 6169.5 (67%)     max: 6213 Points
5496 Points (60%)
Cinebench R10 - Rendering Multiple CPUs 32Bit
min: 13779     avg: 13808.5     median: 13808.5 (28%)     max: 13838 Points
9392 Points (19%)
Cinebench R10 - Rendering Multiple CPUs 64Bit
100%
7Y75 +
11682 Points (15%)
Cinebench R10 - Rendering Single CPUs 64Bit
100%
7Y75 +
6449 Points (63%)
wPrime 2.0x - 1024m *
min: 433     avg: 435.5     median: 435.5 (5%)     max: 438 seconds
618.9 seconds (7%)
wPrime 2.0x - 32m *
min: 12.6     avg: 12.9     median: 12.9 (3%)     max: 13.2 seconds
17.4 seconds (3%)
7-Zip 18.03 - 7z b 4
100%
7Y75 +
9657 MIPS (21%)
7-Zip 18.03 - 7z b 4 -mmt1
100%
7Y75 +
4617 MIPS (67%)
X264 HD Benchmark 4.0 - Pass 2
min: 25     avg: 25.3     median: 25.3 (1%)     max: 25.6 fps
16 fps (0%)
X264 HD Benchmark 4.0 - Pass 1
min: 134     avg: 136.5     median: 136.5 (51%)     max: 139 fps
91.2 fps (34%)
HWBOT x265 Benchmark v2.2 - 4k Preset
100%
7Y75 +
2 fps (11%)
TrueCrypt - Serpent Mean 100MB
0.2 GB/s (12%)
0.2 GB/s (11%)
TrueCrypt - Twofish Mean 100MB
0.4 GB/s (13%)
0.3 GB/s (11%)
TrueCrypt - AES Mean 100MB
2.4 GB/s (12%)
2 GB/s (10%)
Blender 2.79 *
1257 Seconds (13%)
1920.6 Seconds (20%)
3DMark 06 - CPU
min: 5193     avg: 5226.5     median: 5226.5 (36%)     max: 5260 Points
3309 Points (23%)
Super Pi mod 1.5 XS 1M *
100%
7Y75 +
10.7 Seconds (2%)
Super Pi mod 1.5 XS 2M *
100%
7Y75 +
24.5 Seconds (1%)
Super Pi Mod 1.5 XS 32M *
100%
7Y75 +
585.2 Seconds (3%)
3DMark 11 - Performance Physics 1280x720
min: 4463     avg: 5068.7     median: 5230 (28%)     max: 5513 points
min: 3347     avg: 3581.7     median: 3688 (20%)     max: 3710 points
3DMark - Ice Storm Standard Physics 1280x720
100%
7Y75 +
min: 34113     avg: 34680.5     median: 34680.5 (22%)     max: 35248 Points
3DMark - Ice Storm Extreme Physics 1920x1080
100%
7Y75 +
min: 31394     avg: 32948     median: 32948 (39%)     max: 34502 Points
3DMark - Ice Storm Unlimited Physics 1280x720 offscreen
57582 Points (67%)
min: 35750     avg: 40104.3     median: 37884 (44%)     max: 46679 Points
3DMark - Cloud Gate Standard Physics 1280x720
min: 3823     avg: 3935.5     median: 3935.5 (10%)     max: 4048 Points
min: 2706     avg: 2924     median: 2994 (8%)     max: 3072 Points
3DMark - Fire Strike Physics 1920x1080
min: 5412     avg: 5560.5     median: 5560.5 (21%)     max: 5709 Points
min: 3838     avg: 4174     median: 4289 (16%)     max: 4395 Points
Geekbench 3 - 64 Bit Multi-Core Score
8570 Points (23%)
Geekbench 3 - 64 Bit Single-Core Score
4074 Points (83%)
Geekbench 4.0 - Compute OpenCL Score
29573 Points (10%)
Geekbench 4.0 - 64 Bit Multi-Core Score
8952 Points (33%)
Geekbench 4.0 - 64 Bit Single-Core Score
4603 Points (80%)
Geekbench 4.3 - 64 Bit Single-Core Score
4786 Points (76%)
Geekbench 4.3 - 64 Bit Multi-Core Score
9320 Points (26%)
Mozilla Kraken 1.1 - Total Score *
min: 927     avg: 937.7     median: 937.7 (2%)     max: 948.4 ms
1468.2 ms (2%)
Sunspider - 1.0 Total Score *
min: 65.2     avg: 65.6     median: 65.6 (1%)     max: 66 ms
100%
7Y75 +
89.4 ms (1%)
Octane V2 - Total Score
min: 35767     avg: 36436.5     median: 36436.5 (70%)     max: 37106 Points
min: 22300     avg: 24506     median: 24506 (47%)     max: 26712 Points
Power Consumption - Prime95 V28,10 Stress Power Consumption (external Monitor) ultra *
100%
1 7660U +
min: 39.2     avg: 40     median: 40 (11%)     max: 40.8 Watt
106%
1 7Y75 +
18.5 Watt (5%)
Power Consumption - Cinebench R15 Multi Power Consumption (external Monitor) ultra *
100%
1 7660U +
min: 39.2     avg: 40     median: 40 (11%)     max: 40.8 Watt
107%
1 7Y75 +
17.9 Watt (5%)

Average Benchmarks Intel Core i7-7660U → 100%

Average Benchmarks Intel Core i7-7Y75 → 86%

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* Smaller numbers mean a higher performance
1 This benchmark is not used for the average calculation

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Redaktion, 2017-09- 8 (Update: 2017-09-11)