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Core i7-9750H vs i9-9900K


Description
Both models i7-9750H 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 i7-9750H gets a score of 276.5 k points while the i9-9900K gets 545.3 k points.

Summarizing, the i9-9900K is 2 times faster than the i7-9750H. To get a proper comparison between both models, take a look to the data shown below.

Specs
CPUID
906ed
906ec
Core
Coffee Lake-H
Coffee Lake-S
Architecture
Base frecuency
2.6 GHz
3.6 GHz
Boost frecuency
4.5 GHz
5 GHz
Socket
BGA 1440
LGA 1151
Cores/Threads
6/12
8/16
TDP
45 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
April 2019
October 2018
Mean monothread perf.
62.92k points
86.24k points
Mean multithread perf.
276.46k points
545.3k points

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
i7-9750H
i9-9900K
Test#1 (Integers)
4.53k
5.17k (x1.14)
Test#2 (FP)
18.24k
21.15k (x1.16)
Test#3 (Generic, ZIP)
5.76k
7.01k (x1.22)
Test#1 (Memory)
13.01k
15.32k (x1.18)
TOTAL
41.54k
48.66k (x1.17)

Multithread

i7-9750H

i9-9900K
Test#1 (Integers)
24.3k
38.45k (x1.58)
Test#2 (FP)
97.88k
155.68k (x1.59)
Test#3 (Generic, ZIP)
29.85k
51k (x1.71)
Test#1 (Memory)
11.93k
18.26k (x1.53)
TOTAL
163.95k
263.38k (x1.61)

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
i7-9750H
i9-9900K
Test#1 (Integers)
25.22k
33.62k (x1.33)
Test#2 (FP)
21.97k
30.02k (x1.37)
Test#3 (Generic, ZIP)
5.02k
7.17k (x1.43)
Test#1 (Memory)
10.71k
15.43k (x1.44)
TOTAL
62.92k
86.24k (x1.37)

Multithread

i7-9750H

i9-9900K
Test#1 (Integers)
125.56k
248.93k (x1.98)
Test#2 (FP)
115.86k
224.43k (x1.94)
Test#3 (Generic, ZIP)
25.63k
53.39k (x2.08)
Test#1 (Memory)
9.4k
18.54k (x1.97)
TOTAL
276.46k
545.3k (x1.97)

Performance/W
i7-9750H
i9-9900K
Test#1 (Integers)
2790 points/W
2620 points/W
Test#2 (FP)
2575 points/W
2362 points/W
Test#3 (Generic, ZIP)
570 points/W
562 points/W
Test#1 (Memory)
209 points/W
195 points/W
TOTAL
6144 points/W
5740 points/W

Performance/GHz
i7-9750H
i9-9900K
Test#1 (Integers)
5605 points/GHz
6724 points/GHz
Test#2 (FP)
4882 points/GHz
6003 points/GHz
Test#3 (Generic, ZIP)
1115 points/GHz
1434 points/GHz
Test#1 (Memory)
2380 points/GHz
3087 points/GHz
TOTAL
13982 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. 3.11.4