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Core i7-8700k vs i7-9750H


Description
Both models i7-8700k and i7-9750H 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 i7-9750H gets 336.1 k points.

Summarizing, the i7-8700k is 1.3 times faster than the i7-9750H. 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-H
Architecture
Base frecuency
3.7 GHz
2.6 GHz
Boost frecuency
4.7 GHz
4.5 GHz
Socket
LGA 1151
BGA 1440
Cores/Threads
6/12
6/12
TDP
95 W
45 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
April 2019

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
i7-9750H
Test#1 (Integers)
4127
4527 (9.70%)
Test#2 (FP)
16959
18236 (7.53%)
Test#3 (Generic, ZIP)
5564
5763 (3.58%)
Test#1 (Memory)
12845
13010 (1.28%)
TOTAL
39495
41536 (5.17%)

Multithread

i7-8700k

i7-9750H
Test#1 (Integers)
24011
24297 (1.19%)
Test#2 (FP)
108690
97876 (-9.95%)
Test#3 (Generic, ZIP)
36616
29846 (-18.49%)
Test#1 (Memory)
9327
11933 (27.95%)
TOTAL
178644
163951 (-8.22%)

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
i7-9750H
Test#1 (Integers)
12920
16323 (26.34%)
Test#2 (FP)
20678
23423 (13.27%)
Test#3 (Generic, ZIP)
5295
6044 (14.13%)
Test#1 (Memory)
12587
13241 (5.20%)
TOTAL
51480
59031 (14.67%)

Multithread

i7-8700k

i7-9750H
Test#1 (Integers)
94259
86918 (-7.79%)
Test#2 (FP)
152549
126140 (-17.31%)
Test#3 (Generic, ZIP)
39735
29621 (-25.45%)
Test#1 (Memory)
8527
11858 (39.06%)
TOTAL
295071
254537 (-13.74%)

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
i7-9750H
Test#1 (Integers)
16874
16307 (-3.36%)
Test#2 (FP)
26119
24475 (-6.29%)
Test#3 (Generic, ZIP)
6329
5867 (-7.30%)
Test#1 (Memory)
13708
13024 (-4.99%)
TOTAL
63030
59673 (-5.33%)

Multithread

i7-8700k

i7-9750H
Test#1 (Integers)
105740
87541 (-17.21%)
Test#2 (FP)
180520
131053 (-27.40%)
Test#3 (Generic, ZIP)
44994
28473 (-36.72%)
Test#1 (Memory)
8512
11801 (38.65%)
TOTAL
339766
258867 (-23.81%)

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
i7-9750H
Test#1 (Integers)
31204
29414 (-5.74%)
Test#2 (FP)
27821
25808 (-7.24%)
Test#3 (Generic, ZIP)
6568
5970 (-9.10%)
Test#1 (Memory)
15004
13823 (-7.87%)
TOTAL
80598
75016 (-6.93%)

Multithread

i7-8700k

i7-9750H
Test#1 (Integers)
202422
157934 (-21.98%)
Test#2 (FP)
186332
137414 (-26.25%)
Test#3 (Generic, ZIP)
44958
28760 (-36.03%)
Test#1 (Memory)
10054
11984 (19.20%)
TOTAL
443765
336092 (-24.26%)

Performance/W
i7-8700k
i7-9750H
Test#1 (Integers)
2131 points/W
3510 points/W
Test#2 (FP)
1961 points/W
3054 points/W
Test#3 (Generic, ZIP)
473 points/W
639 points/W
Test#1 (Memory)
106 points/W
266 points/W
TOTAL
4671 points/W
7469 points/W

Performance/GHz
i7-8700k
i7-9750H
Test#1 (Integers)
6639 points/GHz
6536 points/GHz
Test#2 (FP)
5919 points/GHz
5735 points/GHz
Test#3 (Generic, ZIP)
1397 points/GHz
1327 points/GHz
Test#1 (Memory)
3192 points/GHz
3072 points/GHz
TOTAL
17148 points/GHz
16670 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