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Core i5-6400 vs Core 2 Quad Q8400


Description
The i5-6400 is based on Skylake architecture while the Q8400 is based on Core.

Using the multithread performance as a reference, the i5-6400 gets a score of 129.5 k points while the Q8400 gets 51.9 k points.

Summarizing, the i5-6400 is 2.5 times faster than the Q8400 . To get a proper comparison between both models, take a look to the data shown below.

Specs
CPUID
506e3
1067a
Core
Skylake-S
Yorkfield
Architecture
Base frecuency
2.7 GHz
2.666 GHz
Boost frecuency
3.3 GHz
2.666 GHz
Socket
LGA 1151
LGA 775
Cores/Threads
4/4
4/4
TDP
65 W
95 W
Cache L1 (d+i)
4x32+4x32 kB
128+128 kB
Cache L2
4x256 kB
4096 kB
Cache L3
6144 kB
0 kB
Date
September 2015
April 2009
Mean monothread perf.
48.05k points
14.04k points
Mean multithread perf.
174.05k points
51.92k 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
i5-6400
Q8400
Test#1 (Integers)
3.2k
2.44k (x0.76)
Test#2 (FP)
12.81k
6.24k (x0.49)
Test#3 (Generic, ZIP)
4.18k
2.62k (x0.63)
Test#1 (Memory)
4.3k
1.43k (x0.33)
TOTAL
24.49k
12.73k (x0.52)

Multithread

i5-6400

Q8400
Test#1 (Integers)
11.45k
9.71k (x0.85)
Test#2 (FP)
46.67k
24.81k (x0.53)
Test#3 (Generic, ZIP)
14.69k
10.51k (x0.72)
Test#1 (Memory)
5.92k
2.03k (x0.34)
TOTAL
78.73k
47.05k (x0.6)

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
i5-6400
Q8400
Test#1 (Integers)
11.56k
3.08k (x0.27)
Test#2 (FP)
16.53k
6.8k (x0.41)
Test#3 (Generic, ZIP)
4.3k
2.73k (x0.64)
Test#1 (Memory)
3.97k
1.42k (x0.36)
TOTAL
36.36k
14.04k (x0.39)

Multithread

i5-6400

Q8400
Test#1 (Integers)
43.01k
12.25k (x0.28)
Test#2 (FP)
64.46k
26.84k (x0.42)
Test#3 (Generic, ZIP)
16.14k
10.82k (x0.67)
Test#1 (Memory)
5.91k
2.02k (x0.34)
TOTAL
129.51k
51.92k (x0.4)

Performance/W
i5-6400
Q8400
Test#1 (Integers)
662 points/W
129 points/W
Test#2 (FP)
992 points/W
283 points/W
Test#3 (Generic, ZIP)
248 points/W
114 points/W
Test#1 (Memory)
91 points/W
21 points/W
TOTAL
1992 points/W
547 points/W

Performance/GHz
i5-6400
Q8400
Test#1 (Integers)
3503 points/GHz
1157 points/GHz
Test#2 (FP)
5009 points/GHz
2551 points/GHz
Test#3 (Generic, ZIP)
1302 points/GHz
1025 points/GHz
Test#1 (Memory)
1203 points/GHz
532 points/GHz
TOTAL
11018 points/GHz
5265 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