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Core i7-6820HQ vs i7-6600U


Description
Both models i7-6820HQ and i7-6600U are based on Skylake architecture.

Sky Lake is also known as 6th generation Core. Include Thunderbolt 3.0, SATA Express and Iris Pro graphics with DirectX 12. It uses LGA 1151 socket for mainstream models and LGA 2066 for X-Series. Sky Lake comes with AVX2 support in all mainstreams CPUs and AVX-512 in some high end models.

Using the multithread performance as a reference, the i7-6820HQ gets a score of 206.3 k points while the i7-6600U gets 79.2 k points.

Summarizing, the i7-6820HQ is 2.6 times faster than the i7-6600U. To get a proper comparison between both models, take a look to the data shown below.

Specs
CPUID
506e3
406e3
Core
Skylake-H
Skylake-U
Architecture
Base frecuency
2.7 GHz
2.6 GHz
Boost frecuency
3.6 GHz
3.4 GHz
Socket
BGA1440
BGA1356
Cores/Threads
4/8
2/4
TDP
45 W
15 W
Cache L1 (d+i)
4x32+4x32 kB
2x32+2x32 kB
Cache L2
4x256 kB
2x256 kB
Cache L3
8192 kB
4096 kB
Date
October 2015
September 2015

Non-optimized benchmark
The benchmark in Mode 0 (FPU) measures cpu performance with non-optimized software. It uses the basic µinstructions from the i386 architecture with the i387 floating point unit. This mode is compatible with all CPUs so it's practical to compare very different CPUs
Monothread
i7-6820HQ
i7-6600U
Test#1 (Integers)
3180
2748 (-13.57%)
Test#2 (FP)
13020
12231 (-6.06%)
Test#3 (Generic, ZIP)
4169
3899 (-6.47%)
Test#1 (Memory)
6931
5606 (-19.12%)
TOTAL
27299
24484 (-10.31%)

Multithread

i7-6820HQ

i7-6600U
Test#1 (Integers)
13259
5231 (-60.55%)
Test#2 (FP)
62228
25002 (-59.82%)
Test#3 (Generic, ZIP)
20342
8980 (-55.86%)
Test#1 (Memory)
5464
4734 (-13.35%)
TOTAL
101292
43947 (-56.61%)

SSE3 optimized benchmark
The benchmark in mode I (SSE) is optimized for the use of SIMD instructions with 128 bits register and the SSE set up to version 3. Nearly every modern CPU has support for this mode.
Monothread
i7-6820HQ
i7-6600U
Test#1 (Integers)
11536
6763 (-41.38%)
Test#2 (FP)
16687
9581 (-42.58%)
Test#3 (Generic, ZIP)
4514
2462 (-45.45%)
Test#1 (Memory)
7273
4180 (-42.53%)
TOTAL
40011
22986 (-42.55%)

Multithread

i7-6820HQ

i7-6600U
Test#1 (Integers)
48501
14371 (-70.37%)
Test#2 (FP)
77016
23794 (-69.10%)
Test#3 (Generic, ZIP)
21301
5706 (-73.21%)
Test#1 (Memory)
5242
4292 (-18.13%)
TOTAL
152060
48163 (-68.33%)

AVX optimized benchmark
The benchmark in mode II (AVX) is optimized to used 256 bits registers beside the first version of the Advanced Vector Extensions (AVX). The first AVX compatible CPU was released in 2011.
Monothread
i7-6820HQ
i7-6600U
Test#1 (Integers)
11784
8490 (-27.95%)
Test#2 (FP)
18056
10919 (-39.53%)
Test#3 (Generic, ZIP)
4479
2763 (-38.32%)
Test#1 (Memory)
7117
4926 (-30.78%)
TOTAL
41437
27098 (-34.60%)

Multithread

i7-6820HQ

i7-6600U
Test#1 (Integers)
49458
14107 (-71.48%)
Test#2 (FP)
84798
20052 (-76.35%)
Test#3 (Generic, ZIP)
20703
6168 (-70.21%)
Test#1 (Memory)
4770
4726 (-0.92%)
TOTAL
159730
45054 (-71.79%)

AVX2 optimized benchmark
The benchmark in mode III (AVX2), like AVX1, is optimized to used 256 bits registers beside the second version of the Advanced Vector Extensions (AVX). The first AVX2 compatible CPU was released in 2013.
Monothread
i7-6820HQ
i7-6600U
Test#1 (Integers)
21147
16724 (-20.91%)
Test#2 (FP)
18663
14705 (-21.21%)
Test#3 (Generic, ZIP)
4359
3397 (-22.09%)
Test#1 (Memory)
6240
4901 (-21.46%)
TOTAL
50409
39727 (-21.19%)

Multithread

i7-6820HQ

i7-6600U
Test#1 (Integers)
91901
33409 (-63.65%)
Test#2 (FP)
87330
31663 (-63.74%)
Test#3 (Generic, ZIP)
20715
8184 (-60.49%)
Test#1 (Memory)
6325
5968 (-5.65%)
TOTAL
206271
79224 (-61.59%)

Performance/W
i7-6820HQ
i7-6600U
Test#1 (Integers)
2042 points/W
2227 points/W
Test#2 (FP)
1941 points/W
2111 points/W
Test#3 (Generic, ZIP)
460 points/W
546 points/W
Test#1 (Memory)
141 points/W
398 points/W
TOTAL
4584 points/W
5282 points/W

Performance/GHz
i7-6820HQ
i7-6600U
Test#1 (Integers)
5874 points/GHz
4919 points/GHz
Test#2 (FP)
5184 points/GHz
4325 points/GHz
Test#3 (Generic, ZIP)
1211 points/GHz
999 points/GHz
Test#1 (Memory)
1733 points/GHz
1441 points/GHz
TOTAL
14002 points/GHz
11684 points/GHz

Monothread performance graph
Monothread performance graphics gives the performance vs time. They are useful to measure the time it takes to the CPU to reach the maximum performance.

Usually, CPU's performance will be steady during these tests but if it has a slow frequency strategy, the first samples will show a lower score.


Test#1 (Integers) [points vs time]

grafica bm.hardlimit.com


Test#2 (FP) [points vs time]

grafica bm.hardlimit.com


Test#3 (Generic, ZIP) [points vs time]

grafica bm.hardlimit.com


Test#1 (Memory) [points vs time]

grafica bm.hardlimit.com

Multithread performance graph
Multithread graphs measure the performance against a heavy load during certain time.

If CPU's TDP doesn't limit the frequency and the machine is properly cooled, performance should remain steady vs time. Otherwise, the performance score will oscillate or decrease over time.


Test#1 (Integers) [points vs time]

grafica bm.hardlimit.com


Test#2 (FP) [points vs time]

grafica bm.hardlimit.com


Test#3 (Generic, ZIP) [points vs time]

grafica bm.hardlimit.com


Test#1 (Memory) [points vs time]

grafica bm.hardlimit.com

Hardlimit Benchmark Central - Ver. 3.7.8