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Xeon E5-2651 v2 vs E5645


Description
The E5-2651 v2 is based on Ivy Bridge architecture while the E5645 is based on Westmere.

Using the multithread performance as a reference, the E5-2651 v2 gets a score of 415 k points while the E5645 gets 77 k points.

Summarizing, the E5-2651 v2 is 5.4 times faster than the E5645 . To get a proper comparison between both models, take a look to the data shown below.

Specs
CPUID
306e4
206c2
Core
Ivy Bridge-EP
Westmere-EP
Architecture
Base frecuency
1.8 GHz
2.4 GHz
Boost frecuency
2.2 GHz
2.8 GHz
Socket
LGA 2011
LGA 1366
Cores/Threads
12/24
6 /6
TDP
W
80 W
Cache L1 (d+i)
12x32+12x32 kB
64 kB
Cache L2
12x256 kB
256 kB
Cache L3
30720 kB
12288 kB
Date
October 2013
March 2010
Mean monothread perf.
17.75k points
15.64k points
Mean multithread perf.
426.18k points
76.96k points

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
E5-2651 v2
E5645
Test#1 (Integers)
6.75k
6.47k (x0.96)
Test#2 (FP)
6.05k
4.4k (x0.73)
Test#3 (Generic, ZIP)
2.61k
2.43k (x0.93)
Test#1 (Memory)
2.26k
2.33k (x1.03)
TOTAL
17.68k
15.64k (x0.88)

Multithread

E5-2651 v2

E5645
Test#1 (Integers)
168.18k
34.43k (x0.2)
Test#2 (FP)
159.6k
24.23k (x0.15)
Test#3 (Generic, ZIP)
77.04k
14.48k (x0.19)
Test#1 (Memory)
10.19k
3.81k (x0.37)
TOTAL
415.01k
76.96k (x0.19)

Performance/W
E5-2651 v2
E5645
Test#1 (Integers)