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Core i7-8700k vs i9-9900K


Description
Both models i7-8700k and i9-9900K 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 i9-9900K gets 529.3 k points.

Summarizing, the i9-9900K is 1.2 times faster than the i7-8700k. To get a proper comparison between both models, take a look to the data shown below.

Specs
CPUID
906ea
906ed
Core
Coffee Lake-S
Coffee Lake-S
Architecture
Base frecuency
3.7 GHz
3.6 GHz
Boost frecuency
4.7 GHz
5 GHz
Socket
LGA 1151
LGA 1151
Cores/Threads
6/12
8/16
TDP
95 W
95 W
Cache L1 (d+i)
6x32+6x32 kB
8x32+8x32 kB
Cache L2
6x256 kB
8x256 kB
Cache L3
12288 kB
16384 kB
Date
October 2017
October 2018

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
i9-9900K
Test#1 (Integers)
4127
4996 (21.06%)
Test#2 (FP)
16959
20217 (19.21%)
Test#3 (Generic, ZIP)
5564
6545 (17.62%)
Test#1 (Memory)
12845
13775 (7.24%)
TOTAL
39495
45532 (15.29%)

Multithread

i7-8700k

i9-9900K
Test#1 (Integers)
24011
36390 (51.56%)
Test#2 (FP)
108690
166549 (53.23%)
Test#3 (Generic, ZIP)
36616
54922 (49.99%)
Test#1 (Memory)
9327
8963 (-3.90%)
TOTAL
178644
266824 (49.36%)

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
i9-9900K
Test#1 (Integers)
12920
18030 (39.56%)
Test#2 (FP)
20678
25978 (25.63%)
Test#3 (Generic, ZIP)
5295
6859 (29.53%)
Test#1 (Memory)
12587
14502 (15.22%)
TOTAL
51480
65369 (26.98%)

Multithread

i7-8700k

i9-9900K
Test#1 (Integers)
94259
131344 (39.34%)
Test#2 (FP)
152549
204758 (34.22%)
Test#3 (Generic, ZIP)
39735
55741 (40.28%)
Test#1 (Memory)
8527
8989 (5.41%)
TOTAL
295071
400832 (35.84%)

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
i9-9900K
Test#1 (Integers)
16874
17979 (6.55%)
Test#2 (FP)
26119
27039 (3.52%)
Test#3 (Generic, ZIP)
6329
6627 (4.71%)
Test#1 (Memory)
13708
13600 (-0.79%)
TOTAL
63030
65245 (3.51%)

Multithread

i7-8700k

i9-9900K
Test#1 (Integers)
105740
130881 (23.78%)
Test#2 (FP)
180520
208498 (15.50%)
Test#3 (Generic, ZIP)
44994
54122 (20.29%)
Test#1 (Memory)
8512
8905 (4.62%)
TOTAL
339766
402406 (18.44%)

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
i9-9900K
Test#1 (Integers)
31204
32085 (2.82%)
Test#2 (FP)
27821
28170 (1.25%)
Test#3 (Generic, ZIP)
6568
6675 (1.64%)
Test#1 (Memory)
15004
14978 (-0.18%)
TOTAL
80598
81908 (1.63%)

Multithread

i7-8700k

i9-9900K
Test#1 (Integers)
202422
242980 (20.04%)
Test#2 (FP)
186332
220157 (18.15%)
Test#3 (Generic, ZIP)
44958
53966 (20.04%)
Test#1 (Memory)
10054
12218 (21.53%)
TOTAL
443765
529320 (19.28%)

Performance/W
i7-8700k
i9-9900K
Test#1 (Integers)
2131 points/W
2558 points/W
Test#2 (FP)
1961 points/W
2317 points/W
Test#3 (Generic, ZIP)
473 points/W
568 points/W
Test#1 (Memory)
106 points/W
129 points/W
TOTAL
4671 points/W
5572 points/W

Performance/GHz
i7-8700k
i9-9900K
Test#1 (Integers)
6639 points/GHz
6417 points/GHz
Test#2 (FP)
5919 points/GHz
5634 points/GHz
Test#3 (Generic, ZIP)
1397 points/GHz
1335 points/GHz
Test#1 (Memory)
3192 points/GHz
2996 points/GHz
TOTAL
17148 points/GHz
16382 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