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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 545.3 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
906ec
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
5171 (25.30%)
Test#2 (FP)
16959
21152 (24.72%)
Test#3 (Generic, ZIP)
5564
7009 (25.97%)
Test#1 (Memory)
12845
15324 (19.29%)
TOTAL
39495
48655 (23.19%)

Multithread

i7-8700k

i9-9900K
Test#1 (Integers)
24011
38451 (60.14%)
Test#2 (FP)
108690
155679 (43.23%)
Test#3 (Generic, ZIP)
36616
50999 (39.28%)
Test#1 (Memory)
9327
18255 (95.74%)
TOTAL
178644
263385 (47.44%)

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
33619 (7.74%)
Test#2 (FP)
27821
30015 (7.89%)
Test#3 (Generic, ZIP)
6568
7168 (9.14%)
Test#1 (Memory)
15004
15434 (2.86%)
TOTAL
80598
86236 (7.00%)

Multithread

i7-8700k

i9-9900K
Test#1 (Integers)
202422
248933 (22.98%)
Test#2 (FP)
186332
224434 (20.45%)
Test#3 (Generic, ZIP)
44958
53389 (18.75%)
Test#1 (Memory)
10054
18540 (84.41%)
TOTAL
443765
545296 (22.88%)

Performance/W
i7-8700k
i9-9900K
Test#1 (Integers)
2131 points/W
2620 points/W
Test#2 (FP)
1961 points/W
2362 points/W
Test#3 (Generic, ZIP)
473 points/W
562 points/W
Test#1 (Memory)
106 points/W
195 points/W
TOTAL
4671 points/W
5740 points/W

Performance/GHz
i7-8700k
i9-9900K
Test#1 (Integers)
6639 points/GHz
6724 points/GHz
Test#2 (FP)
5919 points/GHz
6003 points/GHz
Test#3 (Generic, ZIP)
1397 points/GHz
1434 points/GHz
Test#1 (Memory)
3192 points/GHz
3087 points/GHz
TOTAL
17148 points/GHz
17247 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