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Core 2 Duo E8400 vs Xeon E5645


Description
The E8400 is based on Core architecture while the E5645 is based on Westmere.

Using the multithread performance as a reference, the E8400 gets a score of 27.1 k points while the E5645 gets 77 k points.

Summarizing, the E5645 is 2.8 times faster than the E8400 . To get a proper comparison between both models, take a look to the data shown below.

Specs
CPUID
1067a
206c2
Core
Wolfdale
Westmere-EP
Architecture
Base frecuency
3 GHz
2.4 GHz
Boost frecuency
3 GHz
2.8 GHz
Socket
LGA 775
LGA 1366
Cores/Threads
2/2
6 /6
TDP
65 W
80 W
Cache L1 (d+i)
2x32+2x32 kB
64 kB
Cache L2
6144 kB
256 kB
Cache L3
0 kB
12288 kB
Date
January 2008
March 2010
Mean monothread perf.
17.28k points
15.64k points
Mean multithread perf.
27.11k 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
E8400
E5645
Test#1 (Integers)
2.47k
1.78k (x0.72)
Test#2 (FP)
6.74k
3.91k (x0.58)
Test#3 (Generic, ZIP)
2.87k
2.52k (x0.88)
Test#1 (Memory)
4.47k
2.42k (x0.54)
TOTAL
16.55k
10.64k (x0.64)

Multithread

E8400

E5645
Test#1 (Integers)
4.64k
9.67k (x2.08)
Test#2 (FP)
12.36k
22.92k (x1.85)
Test#3 (Generic, ZIP)
4.86k
14.31k (x2.94)
Test#1 (Memory)
1.96k
3.81k (x1.94)
TOTAL
23.82k
50.7k (x2.13)

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
E8400
E5645
Test#1 (Integers)
3.3k
6.47k (x1.96)
Test#2 (FP)
7.28k
4.4k (x0.61)
Test#3 (Generic, ZIP)
2.88k
2.43k (x0.84)
Test#1 (Memory)
3.83k
2.33k (x0.61)
TOTAL
17.28k
15.64k (x0.9)

Multithread

E8400

E5645
Test#1 (Integers)
6.3k
34.43k (x5.47)
Test#2 (FP)
13.71k
24.23k (x1.77)
Test#3 (Generic, ZIP)
5.32k
14.48k (x2.72)
Test#1 (Memory)
1.78k
3.81k (x2.15)
TOTAL
27.11k
76.96k (x2.84)

Performance/W
E8400
E5645
Test#1 (Integers)
97 points/W
430 points/W
Test#2 (FP)
211 points/W
303 points/W
Test#3 (Generic, ZIP)
82 points/W
181 points/W
Test#1 (Memory)
27 points/W
48 points/W
TOTAL
417 points/W
962 points/W

Performance/GHz
E8400
E5645
Test#1 (Integers)
1099 points/GHz
2311 points/GHz
Test#2 (FP)
2426 points/GHz
1573 points/GHz
Test#3 (Generic, ZIP)
959 points/GHz
867 points/GHz
Test#1 (Memory)
1278 points/GHz
833 points/GHz
TOTAL
5762 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