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Core i7-6700K vs i7-6500U


Description
Both models i7-6700K and i7-6500U 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 i7-6700K gets a score of 254.6 k points while the i7-6500U gets 97.5 k points.

Summarizing, the i7-6700K is 2.6 times faster than the i7-6500U. To get a proper comparison between both models, take a look to the data shown below.

Specs
CPUID
506e3
406e3
Core
Skylake-S
Skylake-U
Architecture
Base frecuency
4 GHz
2.5 GHz
Boost frecuency
4.2 GHz
3.1 GHz
Socket
LGA 1151
BGA1356
Cores/Threads
4/8
2/4
TDP
95 W
15 W
Cache L1 (d+i)
4x32+4x32 kB
2x32+2x32 kB
Cache L2
256 kB
4096 kB
Cache L3
8192 kB
kB
Date
May 2015
September 2015
Mean monothread perf.
63.22k points
46.25k points
Mean multithread perf.
254.56k points
97.52k points

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
i7-6700K
i7-6500U
Test#1 (Integers)
4.07k
2.98k (x0.73)
Test#2 (FP)
16.62k
12.19k (x0.73)
Test#3 (Generic, ZIP)
5.23k
3.91k (x0.75)
Test#1 (Memory)
6.28k
5.3k (x0.84)
TOTAL
32.2k
24.37k (x0.76)

Multithread

i7-6700K

i7-6500U
Test#1 (Integers)
16.37k
6.1k (x0.37)
Test#2 (FP)
77.34k
28.73k (x0.37)
Test#3 (Generic, ZIP)
25.65k
9.56k (x0.37)
Test#1 (Memory)
10.21k
6.71k (x0.66)
TOTAL
129.57k
51.09k (x0.39)

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
i7-6700K
i7-6500U
Test#1 (Integers)
14.73k
11.11k (x0.75)
Test#2 (FP)
21.27k
15.97k (x0.75)
Test#3 (Generic, ZIP)
5.52k
4.25k (x0.77)
Test#1 (Memory)
6.32k
5.66k (x0.9)
TOTAL
47.84k
36.99k (x0.77)

Multithread

i7-6700K

i7-6500U
Test#1 (Integers)
61.09k
23.1k (x0.38)
Test#2 (FP)
99.17k
36.73k (x0.37)
Test#3 (Generic, ZIP)
26.57k
9.99k (x0.38)
Test#1 (Memory)
10.26k
7k (x0.68)
TOTAL
197.09k
76.82k (x0.39)

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
i7-6700K
i7-6500U
Test#1 (Integers)
25.78k
19.47k (x0.75)
Test#2 (FP)
23.08k
17.58k (x0.76)
Test#3 (Generic, ZIP)
5.32k
4.05k (x0.76)
Test#1 (Memory)
9.03k
5.15k (x0.57)
TOTAL
63.22k
46.25k (x0.73)

Multithread

i7-6700K

i7-6500U
Test#1 (Integers)
112.83k
42.05k (x0.37)
Test#2 (FP)
106.86k
40.2k (x0.38)
Test#3 (Generic, ZIP)
25.76k
9.4k (x0.36)
Test#1 (Memory)
9.12k
5.86k (x0.64)
TOTAL
254.56k
97.52k (x0.38)

Performance/W
i7-6700K
i7-6500U
Test#1 (Integers)
1188 points/W
2803 points/W
Test#2 (FP)
1125 points/W
2680 points/W
Test#3 (Generic, ZIP)
271 points/W
626 points/W
Test#1 (Memory)
96 points/W
391 points/W
TOTAL
2680 points/W
6501 points/W

Performance/GHz
i7-6700K
i7-6500U
Test#1 (Integers)
6139 points/GHz
6279 points/GHz
Test#2 (FP)
5495 points/GHz
5672 points/GHz
Test#3 (Generic, ZIP)
1268 points/GHz
1305 points/GHz
Test#1 (Memory)
2150 points/GHz
1662 points/GHz
TOTAL
15052 points/GHz
14918 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. 3.11.4