Intel Core i7-7660U vs Intel Core i7-7820HQ

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 i7-7820HQ

► remove Intel 7820HQ

The Intel Core i7-7820HQ is a fast quad-core processor for notebooks based on the Kaby Lake architecture and was announced in January 2017. It is the second fastest model of the consumer series at the time of the announcement. Only the i7-7920HQ and Xeon E3-1535M v6 are faster. Besides four cores including Hyper-Threading support running at 2.9 - 3.9 GHz (4 cores up to 3.5 GHz, 2 cores up to 3.7 GHz), the processor is also equipped with the HD Graphics 630 GPU as well as a dual-channel memory controller (DDR3L-1600/DDR4-2400). It is manufactured in a 14nm process with FinFET transistors.

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

Due to the higher clock speeds, the performance of the i7-7820HQ is slightly faster than the old Skylake top model Core i7-6920HQ (2.9 - 3.8 GHz). The performance is sufficient even for very demanding tasks and on par with powerful desktop quad-core processors.

Graphics

The integrated Intel HD Graphics 630 has 24 Execution Units (similar to previous HD Graphics 530) running at 350 - 1100 MHz. The performance depends a lot on the memory configuration; it should be comparable to a dedicated Nvidia GeForce 920M in combination with fast DDR4-2133 dual-channel memory.

Contrary to Skylake, Kaby Lake now supports hardware decoding for H.265/HEVC Main 10 with a 10-bit color depth as well as Google's VP9 codec. The dual-core Kaby Lake processors, which were 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 45 Watts, but it can also be reduced to 35 Watts by the notebook manufacturers (cTDP down). This will obviously affect the performance, because the Turbo Boost cannot be maintained for longer periods.

Intel Core i7-7660UIntel Core i7-7820HQ
Intel Core i7Intel Core i7
Kaby LakeKaby Lake
: Core i7 Kaby Lake
Intel Core i7-7920HQ (compare)3100 - 4100 MHz4 / 88 MB
Intel Core i7-7820HQ2900 - 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 i7-7Y75 (compare)1300 - 3600 MHz2 / 44 MB
Intel Core i7-7920HQ (compare)3100 - 4100 MHz4 / 88 MB
» Intel Core i7-7820HQ2900 - 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 i7-7Y75 (compare)1300 - 3600 MHz2 / 44 MB
2500 - 4000 MHz2900 - 3900 MHz
128 KB256 KB
512 KB1 MB
4 MB8 MB
2 / 44 / 8
15 45
14 14
100 °C100 °C
BGA1356
Dual-Channel DDR4 Memory Controller, HyperThreading, AVX, AVX2, Quick Sync, Virtualization, AES-NIDual-Channel DDR4 Memory Controller, HyperThreading, AVX, AVX2, Quick Sync, Virtualization, AES-NI
iGPUIntel Iris Plus Graphics 640 (300 - 1050 MHz)Intel HD Graphics 630 (300 - 1150 MHz)
$415 U.S.$378 U.S.

Cinebench R15 - CPU Multi 64Bit
min: 397     avg: 403.5     median: 403 (9%)     max: 410 Points
min: 630     avg: 709.6     median: 736 (17%)     max: 762 Points
Cinebench R15 - CPU Single 64Bit
min: 154     avg: 158.5     median: 158 (72%)     max: 163 Points
min: 160     avg: 163     median: 163 (75%)     max: 166 Points
Cinebench R11.5 - CPU Multi 64Bit
4.5 Points (10%)
min: 7     avg: 7.9     median: 7 (16%)     max: 8 Points
Cinebench R11.5 - CPU Single 64Bit
1.9 Points (94%)
1.8 Points (91%)
Cinebench R10 - Rendering Single 32Bit
min: 6126     avg: 6169.5     median: 6169 (67%)     max: 6213 Points
min: 5776     avg: 6007.3     median: 6118 (67%)     max: 6128 Points
Cinebench R10 - Rendering Multiple CPUs 32Bit
min: 13779     avg: 13808.5     median: 13808 (21%)     max: 13838 Points
min: 21534     avg: 22293.3     median: 22369 (34%)     max: 22977 Points
wPrime 2.0x - 1024m *
min: 433     avg: 435.5     median: 435 (5%)     max: 438 seconds
317 seconds (4%)
wPrime 2.0x - 32m *
min: 12     avg: 12.9     median: 12 (2%)     max: 13 seconds
9.4 seconds (2%)
X264 HD Benchmark 4.0 - Pass 2
25.3 fps (1%)
X264 HD Benchmark 4.0 - Pass 1
min: 134     avg: 136.5     median: 136 (50%)     max: 139 fps
TrueCrypt - Serpent Mean 100MB
0.2 GB/s (12%)
0.4 GB/s (22%)
TrueCrypt - Twofish Mean 100MB
0.4 GB/s (13%)
0.7 GB/s (22%)
TrueCrypt - AES Mean 100MB
2.4 GB/s (12%)
4.2 GB/s (21%)
Blender 2.79 *
1257 Seconds (13%)
3DMark 06 - CPU
min: 5193     avg: 5226.5     median: 5226 (35%)     max: 5260 Points
min: 6675     avg: 7447.7     median: 7679 (51%)     max: 7989 Points
Super Pi mod 1.5 XS 1M *
9.6 Seconds (2%)
Super Pi mod 1.5 XS 2M *
21.4 Seconds (1%)
Super Pi Mod 1.5 XS 32M *
526.9 Seconds (2%)
3DMark Vantage - P CPU no PhysX 1280x1024
min: 23800     avg: 26622     median: 27717 (39%)     max: 28349 Points
3DMark 11 - Performance Physics 1280x720
min: 4463     avg: 5068.7     median: 5230 (27%)     max: 5513 points
min: 8362     avg: 9086.5     median: 9118 (47%)     max: 9747 points
3DMark - Ice Storm Standard Physics 1280x720
45502 Points (29%)
3DMark - Ice Storm Unlimited Physics 1280x720 offscreen
57582 Points (67%)
min: 44113     avg: 50413.7     median: 52957 (61%)     max: 54171 Points
3DMark - Cloud Gate Standard Physics 1280x720
min: 3823     avg: 3935.5     median: 3935 (10%)     max: 4048 Points
min: 6771     avg: 7397.5     median: 7384 (19%)     max: 8051 Points
3DMark - Fire Strike Physics 1920x1080
min: 5412     avg: 5560.5     median: 5560 (17%)     max: 5709 Points
min: 9364     avg: 10277.2     median: 10303 (32%)     max: 11138 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 (30%)
Geekbench 4.0 - 64 Bit Single-Core Score
4603 Points (77%)
Geekbench 4.4 - 64 Bit Single-Core Score
4786 Points (76%)
Geekbench 4.4 - 64 Bit Multi-Core Score
9320 Points (16%)
Mozilla Kraken 1.1 - Total Score *
min: 927     avg: 937.7     median: 937 (2%)     max: 948 ms
min: 912     avg: 971.6     median: 995 (2%)     max: 1007 ms
Sunspider - 1.0 Total Score *
min: 65     avg: 65.6     median: 65 (1%)     max: 66 ms
74.1 ms (1%)
Octane V2 - Total Score
min: 35767     avg: 36436.5     median: 36436 (70%)     max: 37106 Points
min: 35321     avg: 37525     median: 38182 (73%)     max: 39072 Points
Power Consumption - Prime95 V28,10 Stress Power Consumption (external Monitor) ultra *
100%
1 7660U +
min: 39     avg: 40     median: 40 (9%)     max: 40 Watt
91%
1 7820HQ +
min: 68     avg: 79.1     median: 79 (17%)     max: 89 Watt
Power Consumption - Cinebench R15 Multi Power Consumption (external Monitor) ultra *
100%
1 7660U +
min: 39     avg: 40     median: 40 (7%)     max: 40 Watt
95%
1 7820HQ +
min: 65     avg: 67.7     median: 67 (12%)     max: 70 Watt

Average Benchmarks Intel Core i7-7660U → 100%

Average Benchmarks Intel Core i7-7820HQ → 128%

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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)