The Core i5-6400 is a cpu manufactured by Intel that was released on September 2015. This model has 4 Skylake-S cores , runs at 2700 MHz as base frequency and has a a thermal design power of 65 W.
The i5-6400 has 4x32+4x32 kB of cache L1, 4x256 kB of cache L2 and 6144 kB of cache L3.
Sky Lake is also known as 6th generation Core. Include Thunderbolt 3.0, SATA Express and Iris Pro graphics with DirectX 12. It uses LGA 1151 socket for mainstream models and LGA 2066 for X-Series. Sky Lake comes with AVX2 support in all mainstreams CPUs and AVX-512 in some high end models.
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
Multithread
Test#1 (Integers)
3185
10777 (x3.4)
Test#2 (FP)
12581
44113 (x3.5)
Test#3 (Generic, ZIP)
4105
13887 (x3.4)
Test#1 (Memory)
3934
7829 (x2.0)
TOTAL
23805
76606 (x3.2)
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
Multithread
Test#1 (Integers)
11411
41474 (x3.6)
Test#2 (FP)
16352
65462 (x4.0)
Test#3 (Generic, ZIP)
4146
16202 (x3.9)
Test#1 (Memory)
3277
7660 (x2.3)
TOTAL
35186
130798 (x3.7)
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
Multithread
Test#1 (Integers)
11824
46044 (x3.9)
Test#2 (FP)
18358
69468 (x3.8)
Test#3 (Generic, ZIP)
4426
16330 (x3.7)
Test#1 (Memory)
4950
7742 (x1.6)
TOTAL
39558
139584 (x3.5)
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
Multithread
Test#1 (Integers)
21213
80359 (x3.8)
Test#2 (FP)
18149
71943 (x4.0)
Test#3 (Generic, ZIP)
4213
16375 (x3.9)
Test#1 (Memory)
4304
8054 (x1.9)
TOTAL
47879
176731 (x3.7)
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) [% vs time]
Test#2 (FP) [% vs time]
Test#3 (Generic, ZIP) [% vs time]
Test#1 (Memory) [% vs time]
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.