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Core i7-8700k vs i5-8500T


Description
Both models i7-8700k and i5-8500T 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 i5-8500T gets 251.8 k points.

Summarizing, the i7-8700k is 1.8 times faster than the i5-8500T. 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
2.1 GHz
Boost frecuency
4.7 GHz
3.5 GHz
Socket
LGA 1151
LGA 1151
Cores/Threads
6/12
6/6
TDP
95 W
35 W
Cache L1 (d+i)
6x32+6x32 kB
6x32+6x32 kB
Cache L2
6x256 kB
6x256 kB
Cache L3
12288 kB
9216 kB
Date
October 2017
March 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
i5-8500T
Test#1 (Integers)
4127
3559 (-13.75%)
Test#2 (FP)
16959
14758 (-12.98%)
Test#3 (Generic, ZIP)
5564
4457 (-19.89%)
Test#1 (Memory)
12845
8723 (-32.10%)
TOTAL
39495
31497 (-20.25%)

Multithread

i7-8700k

i5-8500T
Test#1 (Integers)
24011
19371 (-19.32%)
Test#2 (FP)
108690
82354 (-24.23%)
Test#3 (Generic, ZIP)
36616
24602 (-32.81%)
Test#1 (Memory)
9327
2967 (-68.18%)
TOTAL
178644
129295 (-27.62%)

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
i5-8500T
Test#1 (Integers)
12920
12931 (0.09%)
Test#2 (FP)
20678
18613 (-9.99%)
Test#3 (Generic, ZIP)
5295
4759 (-10.13%)
Test#1 (Memory)
12587
10054 (-20.12%)
TOTAL
51480
46358 (-9.95%)

Multithread

i7-8700k

i5-8500T
Test#1 (Integers)
94259
71148 (-24.52%)
Test#2 (FP)
152549
102739 (-32.65%)
Test#3 (Generic, ZIP)
39735
26602 (-33.05%)
Test#1 (Memory)
8527
2898 (-66.02%)
TOTAL
295071
203386 (-31.07%)

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
i5-8500T
Test#1 (Integers)
16874
12920 (-23.43%)
Test#2 (FP)
26119
19465 (-25.47%)
Test#3 (Generic, ZIP)
6329
4620 (-27.00%)
Test#1 (Memory)
13708
9597 (-29.99%)
TOTAL
63030
46603 (-26.06%)

Multithread

i7-8700k

i5-8500T
Test#1 (Integers)
105740
71250 (-32.62%)
Test#2 (FP)
180520
91157 (-49.50%)
Test#3 (Generic, ZIP)
44994
24448 (-45.66%)
Test#1 (Memory)
8512
2851 (-66.51%)
TOTAL
339766
189705 (-44.17%)

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
i5-8500T
Test#1 (Integers)
31204
23129 (-25.88%)
Test#2 (FP)
27821
20698 (-25.61%)
Test#3 (Generic, ZIP)
6568
4710 (-28.29%)
Test#1 (Memory)
15004
10734 (-28.46%)
TOTAL
80598
59270 (-26.46%)

Multithread

i7-8700k

i5-8500T
Test#1 (Integers)
202422
125168 (-38.16%)
Test#2 (FP)
186332
98070 (-47.37%)
Test#3 (Generic, ZIP)
44958
25570 (-43.13%)
Test#1 (Memory)
10054
3015 (-70.01%)
TOTAL
443765
251822 (-43.25%)

Performance/W
i7-8700k
i5-8500T
Test#1 (Integers)
2131 points/W
3576 points/W
Test#2 (FP)
1961 points/W
2802 points/W
Test#3 (Generic, ZIP)
473 points/W
731 points/W
Test#1 (Memory)
106 points/W
86 points/W
TOTAL
4671 points/W
7195 points/W

Performance/GHz
i7-8700k
i5-8500T
Test#1 (Integers)
6639 points/GHz
6608 points/GHz
Test#2 (FP)
5919 points/GHz
5914 points/GHz
Test#3 (Generic, ZIP)
1397 points/GHz
1346 points/GHz
Test#1 (Memory)
3192 points/GHz
3067 points/GHz
TOTAL
17148 points/GHz
16934 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