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Pentium D 820 vs Core i7-720QM


Description
The 820 is based on NetBurst architecture while the i7-720QM is based on Nehalem.

Using the multithread performance as a reference, the 820 gets a score of 14.1 k points while the i7-720QM gets 38.8 k points.

Summarizing, the i7-720QM is 2.8 times faster than the 820. To get a proper comparison between both models, take a look to the data shown below.

Specs
CPUID
f44
106e5
Core
Smithfield
Clarksfield
Architecture
Base frecuency
2.8 GHz
1.6 GHz
Boost frecuency
2.8 GHz
2.8 GHz
Socket
LGA 775
988-pin micro-FCPGA8
Cores/Threads
2/2
4/8
TDP
130 W
45 W
Cache L1 (d+i)
16+8 kB
4x32+4x32 kB
Cache L2
2048 kB
4x256 kB
Cache L3
0 kB
6144 kB
Date
May 2005
September 2009
Mean monothread perf.
7.45k points
13.13k points
Mean multithread perf.
14.07k points
38.78k 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
820
i7-720QM
Test#1 (Integers)
1.46k
1.49k (x1.02)
Test#2 (FP)
2.6k
3.4k (x1.31)
Test#3 (Generic, ZIP)
1.26k
1.95k (x1.54)
Test#1 (Memory)
0.91k
2.08k (x2.28)
TOTAL
6.23k
8.92k (x1.43)

Multithread

820

i7-720QM
Test#1 (Integers)
2.93k
4.23k (x1.45)
Test#2 (FP)
5.19k
11.4k (x2.2)
Test#3 (Generic, ZIP)
2.53k
7.17k (x2.84)
Test#1 (Memory)
0.94k
4.51k (x4.79)
TOTAL
11.59k
27.32k (x2.36)

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
820
i7-720QM
Test#1 (Integers)
1.93k
5.49k (x2.84)
Test#2 (FP)
3.11k
3.55k (x1.14)
Test#3 (Generic, ZIP)
1.49k
2.01k (x1.34)
Test#1 (Memory)
0.91k
2.09k (x2.3)
TOTAL
7.45k
13.13k (x1.76)

Multithread

820

i7-720QM
Test#1 (Integers)
3.92k
15.06k (x3.84)
Test#2 (FP)
6.23k
12.15k (x1.95)
Test#3 (Generic, ZIP)
2.99k
7.18k (x2.4)
Test#1 (Memory)
0.94k
4.39k (x4.69)
TOTAL
14.07k
38.78k (x2.76)

Performance/W
820
i7-720QM
Test#1 (Integers)
30 points/W
335 points/W
Test#2 (FP)
48 points/W
270 points/W
Test#3 (Generic, ZIP)
23 points/W
160 points/W
Test#1 (Memory)
7 points/W
98 points/W
TOTAL
108 points/W
862 points/W

Performance/GHz
820
i7-720QM
Test#1 (Integers)
690 points/GHz
1962 points/GHz
Test#2 (FP)
1112 points/GHz
1267 points/GHz
Test#3 (Generic, ZIP)
534 points/GHz
717 points/GHz
Test#1 (Memory)
324 points/GHz
745 points/GHz
TOTAL
2660 points/GHz
4691 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