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Core i7-6500U vs Xeon E5645


Description
The i7-6500U is based on Skylake architecture while the E5645 is based on Westmere.

Using the multithread performance as a reference, the i7-6500U gets a score of 76.8 k points while the E5645 gets 77 k points.

Summarizing, the E5645 is 1 times faster than the i7-6500U. To get a proper comparison between both models, take a look to the data shown below.

Specs
CPUID
406e3
206c2
Core
Skylake-U
Westmere-EP
Architecture
Base frecuency
2.5 GHz
2.4 GHz
Boost frecuency
3.1 GHz
2.8 GHz
Socket
BGA1356
LGA 1366
Cores/Threads
2/4
6 /6
TDP
15 W
80 W
Cache L1 (d+i)
2x32+2x32 kB
64 kB
Cache L2
4096 kB
256 kB
Cache L3
kB
12288 kB
Date
September 2015
March 2010
Mean monothread perf.
46.25k points
15.64k points
Mean multithread perf.
97.52k points
76.96k 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
i7-6500U
E5645
Test#1 (Integers)
2.98k
1.78k (x0.6)
Test#2 (FP)
12.19k
3.91k (x0.32)
Test#3 (Generic, ZIP)
3.91k
2.52k (x0.64)
Test#1 (Memory)
5.3k
2.42k (x0.46)
TOTAL
24.37k
10.64k (x0.44)

Multithread

i7-6500U

E5645
Test#1 (Integers)
6.1k
9.67k (x1.59)
Test#2 (FP)
28.73k
22.92k (x0.8)
Test#3 (Generic, ZIP)
9.56k
14.31k (x1.5)
Test#1 (Memory)
6.71k
3.81k (x0.57)
TOTAL
51.09k
50.7k (x0.99)

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
i7-6500U
E5645
Test#1 (Integers)
11.11k
6.47k (x0.58)
Test#2 (FP)
15.97k
4.4k (x0.28)
Test#3 (Generic, ZIP)
4.25k
2.43k (x0.57)
Test#1 (Memory)
5.66k
2.33k (x0.41)
TOTAL
36.99k
15.64k (x0.42)

Multithread

i7-6500U

E5645
Test#1 (Integers)
23.1k
34.43k (x1.49)
Test#2 (FP)
36.73k
24.23k (x0.66)
Test#3 (Generic, ZIP)
9.99k
14.48k (x1.45)
Test#1 (Memory)
7k
3.81k (x0.54)
TOTAL
76.82k
76.96k (x1)

Performance/W
i7-6500U
E5645
Test#1 (Integers)
1540 points/W
430 points/W
Test#2 (FP)
2449 points/W
303 points/W
Test#3 (Generic, ZIP)
666 points/W
181 points/W
Test#1 (Memory)
467 points/W
48 points/W
TOTAL
5121 points/W
962 points/W

Performance/GHz
i7-6500U
E5645
Test#1 (Integers)
3582 points/GHz
2311 points/GHz
Test#2 (FP)
5152 points/GHz
1573 points/GHz
Test#3 (Generic, ZIP)
1370 points/GHz
867 points/GHz
Test#1 (Memory)
1827 points/GHz
833 points/GHz
TOTAL
11932 points/GHz
5584 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