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Xeon E5645 vs Core i7-920


Description
The E5645 is based on Westmere architecture while the i7-920 is based on Nehalem Westmere.

Using the multithread performance as a reference, the E5645 gets a score of 77 k points while the i7-920 gets 47.2 k points.

Summarizing, the E5645 is 1.6 times faster than the i7-920 . To get a proper comparison between both models, take a look to the data shown below.

Specs
CPUID
206c2
106a5
Core
Westmere-EP
Bloomfield
Architecture
Westmere
Base frecuency
2.4 GHz
2.667 GHz
Boost frecuency
2.8 GHz
2.993 GHz
Socket
LGA 1366
LGA 1366
Cores/Threads
6 /6
4/8
TDP
80 W
130 W
Cache L1 (d+i)
64 kB
32+32 kB
Cache L2
256 kB
256 kB
Cache L3
12288 kB
8192 kB
Date
March 2010
November 2008
Mean monothread perf.
15.64k points
16.33k points
Mean multithread perf.
76.96k points
47.2k 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
E5645
i7-920
Test#1 (Integers)
1.78k
1.97k (x1.11)
Test#2 (FP)
3.91k
4.43k (x1.13)
Test#3 (Generic, ZIP)
2.52k
2.75k (x1.09)
Test#1 (Memory)
2.42k
2.53k (x1.04)
TOTAL
10.64k
11.68k (x1.1)

Multithread

E5645

i7-920
Test#1 (Integers)
9.67k
7.71k (x0.8)
Test#2 (FP)
22.92k
18.81k (x0.82)
Test#3 (Generic, ZIP)
14.31k
13.76k (x0.96)
Test#1 (Memory)
3.81k
5.07k (x1.33)
TOTAL
50.7k
45.34k (x0.89)

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
E5645
i7-920
Test#1 (Integers)
6.47k
6.12k (x0.95)
Test#2 (FP)
4.4k
4.76k (x1.08)
Test#3 (Generic, ZIP)
2.43k
2.78k (x1.15)
Test#1 (Memory)
2.33k
2.67k (x1.14)
TOTAL
15.64k
16.33k (x1.04)

Multithread

E5645

i7-920
Test#1 (Integers)
34.43k
19.26k (x0.56)
Test#2 (FP)
24.23k
14.96k (x0.62)
Test#3 (Generic, ZIP)
14.48k
8.05k (x0.56)
Test#1 (Memory)
3.81k
4.92k (x1.29)
TOTAL
76.96k
47.2k (x0.61)

Performance/W
E5645
i7-920
Test#1 (Integers)
430 points/W
148 points/W
Test#2 (FP)
303 points/W
115 points/W
Test#3 (Generic, ZIP)
181 points/W
62 points/W
Test#1 (Memory)
48 points/W
38 points/W
TOTAL
962 points/W
363 points/W

Performance/GHz
E5645
i7-920
Test#1 (Integers)
2311 points/GHz
2044 points/GHz
Test#2 (FP)
1573 points/GHz
1591 points/GHz
Test#3 (Generic, ZIP)
867 points/GHz
930 points/GHz
Test#1 (Memory)
833 points/GHz
891 points/GHz
TOTAL
5584 points/GHz
5457 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