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Core i7-5500U vs Core 2 Quad Q8400


Description
The i7-5500U is based on Broadwell architecture while the Q8400 is based on Core.

Using the multithread performance as a reference, the i7-5500U gets a score of 63.7 k points while the Q8400 gets 51.9 k points.

Summarizing, the i7-5500U is 1.2 times faster than the Q8400 . To get a proper comparison between both models, take a look to the data shown below.

Specs
CPUID
306d4
1067a
Core
Broadwell-U
Yorkfield
Architecture
Base frecuency
2.4 GHz
2.666 GHz
Boost frecuency
3 GHz
2.666 GHz
Socket
BGA 1168
LGA 775
Cores/Threads
2 /4
4/4
TDP
15 W
95 W
Cache L1 (d+i)
2x32+2x32 kB
128+128 kB
Cache L2
256 kB
4096 kB
Cache L3
4096 kB
0 kB
Date
March 2015
April 2009
Mean monothread perf.
40.41k points
14.04k points
Mean multithread perf.
82.89k 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
i7-5500U
Q8400
Test#1 (Integers)
3.31k
2.44k (x0.74)
Test#2 (FP)
11.61k
6.24k (x0.54)
Test#3 (Generic, ZIP)
3.94k
2.62k (x0.67)
Test#1 (Memory)
3.24k
1.43k (x0.44)
TOTAL
22.1k
12.73k (x0.58)

Multithread

i7-5500U

Q8400
Test#1 (Integers)
5.97k
9.71k (x1.63)
Test#2 (FP)
25.54k
24.81k (x0.97)
Test#3 (Generic, ZIP)
8.8k
10.51k (x1.19)
Test#1 (Memory)
3.36k
2.03k (x0.6)
TOTAL
43.67k
47.05k (x1.08)

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
i7-5500U
Q8400
Test#1 (Integers)
10.59k
3.08k (x0.29)
Test#2 (FP)
13.72k
6.8k (x0.5)
Test#3 (Generic, ZIP)
4.22k
2.73k (x0.65)
Test#1 (Memory)
3.64k
1.42k (x0.39)
TOTAL
32.16k
14.04k (x0.44)

Multithread

i7-5500U

Q8400
Test#1 (Integers)
20.8k
12.25k (x0.59)
Test#2 (FP)
30.44k
26.84k (x0.88)
Test#3 (Generic, ZIP)
9.1k
10.82k (x1.19)
Test#1 (Memory)
3.35k
2.02k (x0.6)
TOTAL
63.69k
51.92k (x0.82)

Performance/W
i7-5500U
Q8400
Test#1 (Integers)
1387 points/W
129 points/W
Test#2 (FP)
2029 points/W
283 points/W
Test#3 (Generic, ZIP)
607 points/W
114 points/W
Test#1 (Memory)
223 points/W
21 points/W
TOTAL
4246 points/W
547 points/W

Performance/GHz
i7-5500U
Q8400
Test#1 (Integers)
3529 points/GHz
1157 points/GHz
Test#2 (FP)
4572 points/GHz
2551 points/GHz
Test#3 (Generic, ZIP)
1408 points/GHz
1025 points/GHz
Test#1 (Memory)
1213 points/GHz
532 points/GHz
TOTAL
10721 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