Core 2 Duo P8400 vs Xeon E5645
Description
The P8400 is based on Core architecture while the E5645 is based on Westmere.
Using the multithread performance as a reference, the P8400 gets a score of 21 k points while the E5645 gets 77 k points.
Summarizing, the E5645 is 3.7 times faster than the P8400. To get a proper comparison between both models, take a look to the data shown below.
Using the multithread performance as a reference, the P8400 gets a score of 21 k points while the E5645 gets 77 k points.
Summarizing, the E5645 is 3.7 times faster than the P8400. To get a proper comparison between both models, take a look to the data shown below.
Specs
CPUID
10676
206c2
Core
Peryn-3M
Westmere-EP
Base frecuency
2.267 GHz
2.4 GHz
Boost frecuency
2.267 GHz
2.8 GHz
Socket
Socket P
LGA 1366
Cores/Threads
2/2
6 /6
TDP
25 W
80 W
Cache L1 (d+i)
2x32 kB
64 kB
Cache L2
3072 kB
256 kB
Cache L3
0 kB
12288 kB
Date
July 2008
March 2010
Mean monothread perf.
11.38k points
15.64k points
Mean multithread perf.
21.02k 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
P8400
E5645
Test#1 (Integers)
1.78k
1.78k (x1)
Test#2 (FP)
4.95k
3.91k (x0.79)
Test#3 (Generic, ZIP)
2.08k
2.52k (x1.21)
Test#1 (Memory)
1.44k
2.42k (x1.68)
TOTAL
10.24k
10.64k (x1.04)
Multithread
P8400
E5645
Test#1 (Integers)
3.53k
9.67k (x2.74)
Test#2 (FP)
9.75k
22.92k (x2.35)
Test#3 (Generic, ZIP)
4.07k
14.31k (x3.52)
Test#1 (Memory)
1.44k
3.81k (x2.65)
TOTAL
18.79k
50.7k (x2.7)
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
P8400
E5645
Test#1 (Integers)
2.43k
6.47k (x2.67)
Test#2 (FP)
5.4k
4.4k (x0.82)
Test#3 (Generic, ZIP)
2.13k
2.43k (x1.14)
Test#1 (Memory)
1.43k
2.33k (x1.64)
TOTAL
11.38k
15.64k (x1.37)
Multithread
P8400
E5645
Test#1 (Integers)
4.81k
34.43k (x7.15)
Test#2 (FP)
10.58k
24.23k (x2.29)
Test#3 (Generic, ZIP)
4.18k
14.48k (x3.47)
Test#1 (Memory)
1.45k
3.81k (x2.63)
TOTAL
21.02k
76.96k (x3.66)
Performance/W
P8400
E5645
Test#1 (Integers)
193 points/W
430 points/W
Test#2 (FP)
423 points/W
303 points/W
Test#3 (Generic, ZIP)
167 points/W
181 points/W
Test#1 (Memory)
58 points/W
48 points/W
TOTAL
841 points/W
962 points/W
Performance/GHz
P8400
E5645
Test#1 (Integers)
1071 points/GHz
2311 points/GHz
Test#2 (FP)
2383 points/GHz
1573 points/GHz
Test#3 (Generic, ZIP)
938 points/GHz
867 points/GHz
Test#1 (Memory)
629 points/GHz
833 points/GHz
TOTAL
5022 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.
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