Intel Core i7-7660U vs Intel Core i7-7700HQ

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 i7-7700HQ

► remove Intel 7700HQ

The Intel Core i7-7700HQ is a fast quad-core processor for notebooks based on the Kaby Lake H architecture (7th generation Core), which was announced in January 2017 at CES. It is the successor to the Core i7-6700HQ from the Skylake generation and is manufactured in an improved 14 nm+ process, so the clocks are 200 MHz higher at the same TDP. The architecture was not changed, only the video engine got an update (see our Kaby Lake article).

The integrated graphics card is called Intel HD Graphics 630, but the architecture does not differ from the 530 GPU from the Skylake generation and only the clocks are slightly higher. 

Performance

Thanks to the 200 MHz higher clocks (5.5-7.6% depending on the Boost), the CPU performance is increased and roughly on par with the Core i7-6970HQ (2.8-3.7 GHz but with 128 MB eDRAM). The TDP can also be reduced to 35 Watts (cTDP down), but this will reduce the performance.

Power Consumption

Due to its 45-Watt TDP, the CPU will be used in bigger notebooks with at least 15 inches most of the time.

Intel Core i7-7660UIntel Core i7-7700HQ
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 i7-7700HQ2800 - 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 i7-7Y75 (compare)1300 - 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 i7-7700HQ2800 - 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 i7-7Y75 (compare)1300 - 3600 MHz2 / 44 MB
2500 - 4000 MHz2800 - 3800 MHz
128 KB256 KB
512 KB1 MB
4 MB6 MB
2 / 44 / 8
15 45
14 14
100 °C100 °C
BGA1356BGA
Dual-Channel DDR4 Memory Controller, HyperThreading, AVX, AVX2, Quick Sync, Virtualization, AES-NIDual-Channel DDR3L-1600/DDR4-2133 Memory Controller, AVX, AVX2, Quick Sync, Virtualization, AES-NI save
iGPUIntel Iris Plus Graphics 640 (300 - 1050 MHz)Intel HD Graphics 630 (350 - 1100 MHz)
$415 U.S.$378 U.S.

Cinebench R15 - CPU Multi 64Bit
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Cinebench R15 - CPU Single 64Bit
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Cinebench R11.5 - CPU Multi 64Bit
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Cinebench R11.5 - CPU Single 64Bit
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Cinebench R10 - Rendering Multiple CPUs 64Bit
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wPrime 2.0x - 1024m *
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wPrime 1.55 - 1024m *
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wPrime 1.55 - 32m *
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WinRAR - Result
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X264 HD Benchmark 4.0 - Pass 2
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X264 HD Benchmark 4.0 - Pass 1
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HWBOT x265 Benchmark v2.2 - 4k Preset
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TrueCrypt - Serpent Mean 100MB
0.2 GB/s (12%)
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TrueCrypt - Twofish Mean 100MB
0.4 GB/s (13%)
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TrueCrypt - AES Mean 100MB
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Blender 2.79 *
1257 Seconds (13%)
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3DMark 06 - CPU
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Super Pi mod 1.5 XS 1M *
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Super Pi mod 1.5 XS 2M *
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Super Pi Mod 1.5 XS 32M *
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3DMark Vantage - P CPU no PhysX 1280x1024
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3DMark 11 - Performance Physics 1280x720
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3DMark - Ice Storm Standard Physics 1280x720
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3DMark - Ice Storm Extreme Physics 1920x1080
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3DMark - Ice Storm Unlimited Physics 1280x720 offscreen
57582 Points (67%)
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3DMark - Cloud Gate Standard Physics 1280x720
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3DMark - Fire Strike Physics 1920x1080
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Geekbench 2 - 32 Bit - Stream
7620 Points (61%)
Geekbench 2 - 32 Bit - Memory
7210 Points (65%)
Geekbench 2 - 32 Bit - Floating Point
12792 Points (37%)
Geekbench 2 - 32 Bit - Integer
13091 Points (40%)
Geekbench 2 - 32 Bit - Total Score
11263 Points (43%)
Geekbench 3 - 64 Bit Multi-Core Score
8570 Points (23%)
min: 13753     avg: 14102.5     median: 14102.5 (37%)     max: 14452 Points
Geekbench 3 - 64 Bit Single-Core Score
4074 Points (83%)
min: 3532     avg: 3715     median: 3715 (76%)     max: 3898 Points
Geekbench 3 - 32 Bit Multi-Core Score
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Geekbench 3 - 32 Bit Single-Core Score
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Geekbench 4.0 - Compute OpenCL Score
29573 Points (10%)
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Geekbench 4.0 - 64 Bit Multi-Core Score
8952 Points (33%)
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Geekbench 4.0 - 64 Bit Single-Core Score
4603 Points (80%)
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Geekbench 4.3 - 64 Bit Single-Core Score
4786 Points (76%)
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Geekbench 4.3 - 64 Bit Multi-Core Score
9320 Points (26%)
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PassMark PerformanceTest 9 - CPU Mark
10003 Points (100%)
Mozilla Kraken 1.1 - Total Score *
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