Xeon E5645 vs Core 2 Quad Q8400
Description
The E5645 is based on Westmere architecture while the Q8400 is based on Core.
Using the multithread performance as a reference, the E5645 gets a score of 77 k points while the Q8400 gets 51.9 k points.
Summarizing, the E5645 is 1.5 times faster than the Q8400 . To get a proper comparison between both models, take a look to the data shown below.
Using the multithread performance as a reference, the E5645 gets a score of 77 k points while the Q8400 gets 51.9 k points.
Summarizing, the E5645 is 1.5 times faster than the Q8400 . To get a proper comparison between both models, take a look to the data shown below.
Specs
CPUID
206c2
1067a
Core
Westmere-EP
Yorkfield
Base frecuency
2.4 GHz
2.666 GHz
Boost frecuency
2.8 GHz
2.666 GHz
Socket
LGA 1366
LGA 775
Cores/Threads
6 /6
4/4
TDP
80 W
95 W
Cache L1 (d+i)
64 kB
128+128 kB
Cache L2
256 kB
4096 kB
Cache L3
12288 kB
0 kB
Date
March 2010
April 2009
Mean monothread perf.
15.64k points
14.04k points
Mean multithread perf.
76.96k 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
E5645
Q8400
Test#1 (Integers)
1.78k
2.44k (x1.37)
Test#2 (FP)
3.91k
6.24k (x1.6)
Test#3 (Generic, ZIP)
2.52k
2.62k (x1.04)
Test#1 (Memory)
2.42k
1.43k (x0.59)
TOTAL
10.64k
12.73k (x1.2)
Multithread
E5645
Q8400
Test#1 (Integers)
9.67k
9.71k (x1)
Test#2 (FP)
22.92k
24.81k (x1.08)
Test#3 (Generic, ZIP)
14.31k
10.51k (x0.73)
Test#1 (Memory)
3.81k
2.03k (x0.53)
TOTAL
50.7k
47.05k (x0.93)
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
Q8400
Test#1 (Integers)
6.47k
3.08k (x0.48)
Test#2 (FP)
4.4k
6.8k (x1.54)
Test#3 (Generic, ZIP)
2.43k
2.73k (x1.13)
Test#1 (Memory)
2.33k
1.42k (x0.61)
TOTAL
15.64k
14.04k (x0.9)
Multithread
E5645
Q8400
Test#1 (Integers)
34.43k
12.25k (x0.36)
Test#2 (FP)
24.23k
26.84k (x1.11)
Test#3 (Generic, ZIP)
14.48k
10.82k (x0.75)
Test#1 (Memory)
3.81k
2.02k (x0.53)
TOTAL
76.96k
51.92k (x0.67)
Performance/W
E5645
Q8400
Test#1 (Integers)
430 points/W
129 points/W
Test#2 (FP)
303 points/W
283 points/W
Test#3 (Generic, ZIP)
181 points/W
114 points/W
Test#1 (Memory)
48 points/W
21 points/W
TOTAL
962 points/W
547 points/W
Performance/GHz
E5645
Q8400
Test#1 (Integers)
2311 points/GHz
1157 points/GHz
Test#2 (FP)
1573 points/GHz
2551 points/GHz
Test#3 (Generic, ZIP)
867 points/GHz
1025 points/GHz
Test#1 (Memory)
833 points/GHz
532 points/GHz
TOTAL
5584 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.
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]
Test#2 (FP) [points vs time]
Test#3 (Generic, ZIP) [points vs time]
Test#1 (Memory) [points vs time]
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.
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]
Test#2 (FP) [points vs time]
Test#3 (Generic, ZIP) [points vs time]
Test#1 (Memory) [points vs time]
Hardlimit Benchmark Central - Ver. 3.11.4