Core 2 Quad Q8400 vs Xeon E5645
Description
The Q8400 is based on Core architecture while the E5645 is based on Westmere.
Using the multithread performance as a reference, the Q8400 gets a score of 51.9 k points while the E5645 gets 77 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 Q8400 gets a score of 51.9 k points while the E5645 gets 77 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
1067a
206c2
Core
Yorkfield
Westmere-EP
Base frecuency
2.666 GHz
2.4 GHz
Boost frecuency
2.666 GHz
2.8 GHz
Socket
LGA 775
LGA 1366
Cores/Threads
4/4
6 /6
TDP
95 W
80 W
Cache L1 (d+i)
128+128 kB
64 kB
Cache L2
4096 kB
256 kB
Cache L3
0 kB
12288 kB
Date
April 2009
March 2010
Mean monothread perf.
14.04k points
15.64k points
Mean multithread perf.
51.92k 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
Q8400
E5645
Test#1 (Integers)
2.44k
1.78k (x0.73)
Test#2 (FP)
6.24k
3.91k (x0.63)
Test#3 (Generic, ZIP)
2.62k
2.52k (x0.96)
Test#1 (Memory)
1.43k
2.42k (x1.7)
TOTAL
12.73k
10.64k (x0.84)
Multithread
Q8400
E5645
Test#1 (Integers)
9.71k
9.67k (x1)
Test#2 (FP)
24.81k
22.92k (x0.92)
Test#3 (Generic, ZIP)
10.51k
14.31k (x1.36)
Test#1 (Memory)
2.03k
3.81k (x1.88)
TOTAL
47.05k
50.7k (x1.08)
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
Q8400
E5645
Test#1 (Integers)
3.08k
6.47k (x2.1)
Test#2 (FP)
6.8k
4.4k (x0.65)
Test#3 (Generic, ZIP)
2.73k
2.43k (x0.89)
Test#1 (Memory)
1.42k
2.33k (x1.65)
TOTAL
14.04k
15.64k (x1.11)
Multithread
Q8400
E5645
Test#1 (Integers)
12.25k
34.43k (x2.81)
Test#2 (FP)
26.84k
24.23k (x0.9)
Test#3 (Generic, ZIP)
10.82k
14.48k (x1.34)
Test#1 (Memory)
2.02k
3.81k (x1.89)
TOTAL
51.92k
76.96k (x1.48)
Performance/W
Q8400
E5645
Test#1 (Integers)
129 points/W
430 points/W
Test#2 (FP)
283 points/W
303 points/W
Test#3 (Generic, ZIP)
114 points/W
181 points/W
Test#1 (Memory)
21 points/W
48 points/W
TOTAL
547 points/W
962 points/W
Performance/GHz
Q8400
E5645
Test#1 (Integers)
1157 points/GHz
2311 points/GHz
Test#2 (FP)
2551 points/GHz
1573 points/GHz
Test#3 (Generic, ZIP)
1025 points/GHz
867 points/GHz
Test#1 (Memory)
532 points/GHz
833 points/GHz
TOTAL
5265 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