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Core i7-8700k vs i7-8700


Description
Both models i7-8700k and i7-8700 are based on Coffee Lake architecture.

Coffee Lake is the second refinement of Intel’s 14nm (Tri-Gate) technology. While it uses LGA1151 socket, it is incompatible with previous generations due to electrical changes in socket’s pins so these CPUs require Z370 chipset. This kind of generation introduced more cores in every range to compete with new AMD’s architecture. Coffee Lake uses DDR4 memory at 2400MHz for i3 and at 2666MHz for i5, i7 CPUs plus iGPU frequency has been increased 50MHz with respect to previous generation.

Using the multithread performance as a reference, the i7-8700k gets a score of 443.8 k points while the i7-8700 gets 403.4 k points.

Summarizing, the i7-8700k is 1.1 times faster than the i7-8700. To get a proper comparison between both models, take a look to the data shown below.

Specs
CPUID
906ea
906ea
Core
Coffee Lake-S
Coffee Lake-S
Architecture
Base frecuency
3.7 GHz
3.2 GHz
Boost frecuency
4.7 GHz
4.6 GHz
Socket
LGA 1151
LGA 1151
Cores/Threads
6/12
6/12
TDP
95 W
65 W
Cache L1 (d+i)
6x32+6x32 kB
6x32+6x32 kB
Cache L2
6x256 kB
6x256 kB
Cache L3
12288 kB
12288 kB
Date
October 2017
October 2017

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
i7-8700
Test#1 (Integers)
4127
4480 (8.55%)
Test#2 (FP)
16959
18306 (7.94%)
Test#3 (Generic, ZIP)
5564
5879 (5.65%)
Test#1 (Memory)
12845
13453 (4.73%)
TOTAL
39495
42117 (6.64%)

Multithread

i7-8700k

i7-8700
Test#1 (Integers)
24011
27353 (13.92%)
Test#2 (FP)
108690
124941 (14.95%)
Test#3 (Generic, ZIP)
36616
43233 (18.07%)
Test#1 (Memory)
9327
7082 (-24.06%)
TOTAL
178644
202610 (13.42%)

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
i7-8700
Test#1 (Integers)
12920
16452 (27.34%)
Test#2 (FP)
20678
23736 (14.79%)
Test#3 (Generic, ZIP)
5295
6242 (17.88%)
Test#1 (Memory)
12587
13435 (6.74%)
TOTAL
51480
59865 (16.29%)

Multithread

i7-8700k

i7-8700
Test#1 (Integers)
94259
100938 (7.09%)
Test#2 (FP)
152549
159085 (4.28%)
Test#3 (Generic, ZIP)
39735
43615 (9.76%)
Test#1 (Memory)
8527
6590 (-22.72%)
TOTAL
295071
310227 (5.14%)

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
i7-8700
Test#1 (Integers)
16874
16574 (-1.78%)
Test#2 (FP)
26119
25517 (-2.30%)
Test#3 (Generic, ZIP)
6329
6014 (-4.98%)
Test#1 (Memory)
13708
12818 (-6.50%)
TOTAL
63030
60922 (-3.34%)

Multithread

i7-8700k

i7-8700
Test#1 (Integers)
105740
101852 (-3.68%)
Test#2 (FP)
180520
170305 (-5.66%)
Test#3 (Generic, ZIP)
44994
43124 (-4.16%)
Test#1 (Memory)
8512
7110 (-16.47%)
TOTAL
339766
322391 (-5.11%)

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
i7-8700
Test#1 (Integers)
31204
29422 (-5.71%)
Test#2 (FP)
27821
26280 (-5.54%)
Test#3 (Generic, ZIP)
6568
6198 (-5.64%)
Test#1 (Memory)
15004
13923 (-7.21%)
TOTAL
80598
75823 (-5.92%)

Multithread

i7-8700k

i7-8700
Test#1 (Integers)
202422
187430 (-7.41%)
Test#2 (FP)
186332
167150 (-10.29%)
Test#3 (Generic, ZIP)
44958
40049 (-10.92%)
Test#1 (Memory)
10054
8735 (-13.11%)
TOTAL
443765
403364 (-9.10%)

Performance/W
i7-8700k
i7-8700
Test#1 (Integers)
2131 points/W
2884 points/W
Test#2 (FP)
1961 points/W
2572 points/W
Test#3 (Generic, ZIP)
473 points/W
616 points/W
Test#1 (Memory)
106 points/W
134 points/W
TOTAL
4671 points/W
6206 points/W

Performance/GHz
i7-8700k
i7-8700
Test#1 (Integers)
6639 points/GHz
6396 points/GHz
Test#2 (FP)
5919 points/GHz
5713 points/GHz
Test#3 (Generic, ZIP)
1397 points/GHz
1347 points/GHz
Test#1 (Memory)
3192 points/GHz
3027 points/GHz
TOTAL
17148 points/GHz
16483 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