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Core i7-8700k vs i7-7500U


Description
The i7-8700k is based on Coffee Lake architecture while the i7-7500U is based on Kaby Lake.

Using the multithread performance as a reference, the i7-8700k gets a score of 443.8 k points while the i7-7500U gets 100.6 k points.

Summarizing, the i7-8700k is 4.4 times faster than the i7-7500U. To get a proper comparison between both models, take a look to the data shown below.

Specs
CPUID
906ea
806e9
Core
Coffee Lake-S
Kaby Lake-U
Architecture
Base frecuency
3.7 GHz
2.7 GHz
Boost frecuency
4.7 GHz
3.5 GHz
Socket
LGA 1151
BGA1356
Cores/Threads
6/12
2/4
TDP
95 W
15 W
Cache L1 (d+i)
6x32+6x32 kB
2x32+2x32 kB
Cache L2
6x256 kB
2x256 kB
Cache L3
12288 kB
4096 kB
Date
October 2017
August 2016

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
i7-8700k
i7-7500U
Test#1 (Integers)
4127
3525 (-14.58%)
Test#2 (FP)
16959
14669 (-13.50%)
Test#3 (Generic, ZIP)
5564
4837 (-13.07%)
Test#1 (Memory)
12845
6256 (-51.30%)
TOTAL
39495
29287 (-25.85%)

Multithread

i7-8700k

i7-7500U
Test#1 (Integers)
24011
7263 (-69.75%)
Test#2 (FP)
108690
35040 (-67.76%)
Test#3 (Generic, ZIP)
36616
11276 (-69.21%)
Test#1 (Memory)
9327
5695 (-38.94%)
TOTAL
178644
59273 (-66.82%)

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
i7-8700k
i7-7500U
Test#1 (Integers)
12920
12932 (0.09%)
Test#2 (FP)
20678
18628 (-9.92%)
Test#3 (Generic, ZIP)
5295
5031 (-4.99%)
Test#1 (Memory)
12587
6163 (-51.03%)
TOTAL
51480
42753 (-16.95%)

Multithread

i7-8700k

i7-7500U
Test#1 (Integers)
94259
27132 (-71.22%)
Test#2 (FP)
152549
43194 (-71.69%)
Test#3 (Generic, ZIP)
39735
11703 (-70.55%)
Test#1 (Memory)
8527
4990 (-41.48%)
TOTAL
295071
87018 (-70.51%)

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
i7-8700k
i7-7500U
Test#1 (Integers)
16874
12707 (-24.69%)
Test#2 (FP)
26119
18607 (-28.76%)
Test#3 (Generic, ZIP)
6329
4777 (-24.53%)
Test#1 (Memory)
13708
6633 (-51.61%)
TOTAL
63030
42724 (-32.22%)

Multithread

i7-8700k

i7-7500U
Test#1 (Integers)
105740
27271 (-74.21%)
Test#2 (FP)
180520
44704 (-75.24%)
Test#3 (Generic, ZIP)
44994
11329 (-74.82%)
Test#1 (Memory)
8512
5555 (-34.74%)
TOTAL
339766
88858 (-73.85%)

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
i7-8700k
i7-7500U
Test#1 (Integers)
31204
19893 (-36.25%)
Test#2 (FP)
27821
18106 (-34.92%)
Test#3 (Generic, ZIP)
6568
4168 (-36.53%)
Test#1 (Memory)
15004
5404 (-63.98%)
TOTAL
80598
47572 (-40.98%)

Multithread

i7-8700k

i7-7500U
Test#1 (Integers)
202422
43630 (-78.45%)
Test#2 (FP)
186332
42764 (-77.05%)
Test#3 (Generic, ZIP)
44958
9415 (-79.06%)
Test#1 (Memory)
10054
4745 (-52.80%)
TOTAL
443765
100554 (-77.34%)

Performance/W
i7-8700k
i7-7500U
Test#1 (Integers)
2131 points/W
2909 points/W
Test#2 (FP)
1961 points/W
2851 points/W
Test#3 (Generic, ZIP)
473 points/W
628 points/W
Test#1 (Memory)
106 points/W
316 points/W
TOTAL
4671 points/W
6704 points/W

Performance/GHz
i7-8700k
i7-7500U
Test#1 (Integers)
6639 points/GHz
5684 points/GHz
Test#2 (FP)
5919 points/GHz
5173 points/GHz
Test#3 (Generic, ZIP)
1397 points/GHz
1191 points/GHz
Test#1 (Memory)
3192 points/GHz
1544 points/GHz
TOTAL
17148 points/GHz
13592 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. 3.7.9