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Core i7-640LM vs i7-720QM


Description
The i7-640LM is based on Westmere architecture while the i7-720QM is based on Nehalem.

Using the multithread performance as a reference, the i7-640LM gets a score of 31.7 k points while the i7-720QM gets 38.8 k points.

Summarizing, the i7-720QM is 1.2 times faster than the i7-640LM. To get a proper comparison between both models, take a look to the data shown below.

Specs
CPUID
20655
106e5
Core
Calpella
Clarksfield
Architecture
Base frecuency
2.133 GHz
1.6 GHz
Boost frecuency
2.667 GHz
2.8 GHz
Socket
BGA1288
988-pin micro-FCPGA8
Cores/Threads
2/4
4/8
TDP
25 W
45 W
Cache L1 (d+i)
2x32+2x32 kB
4x32+4x32 kB
Cache L2
2x256 kB
4x256 kB
Cache L3
4096 kB
6144 kB
Date
January 2010
September 2009
Mean monothread perf.
16.35k points
13.13k points
Mean multithread perf.
31.74k points
38.78k points

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
i7-640LM
i7-720QM
Test#1 (Integers)
7.01k
5.49k (x0.78)
Test#2 (FP)
4.58k
3.55k (x0.77)
Test#3 (Generic, ZIP)
2.73k
2.01k (x0.74)
Test#1 (Memory)
2.03k
2.09k (x1.03)
TOTAL
16.35k
13.13k (x0.8)

Multithread

i7-640LM

i7-720QM
Test#1 (Integers)
12.93k
15.06k (x1.16)
Test#2 (FP)
10.21k
12.15k (x1.19)
Test#3 (Generic, ZIP)
6.22k
7.18k (x1.15)
Test#1 (Memory)
2.37k
4.39k (x1.86)
TOTAL
31.74k
38.78k (x1.22)

Performance/W
i7-640LM
i7-720QM
Test#1 (Integers)
517 points/W
335 points/W
Test#2 (FP)
409 points/W
270 points/W
Test#3 (Generic, ZIP)
249 points/W
160 points/W
Test#1 (Memory)
95 points/W
98 points/W
TOTAL
1269 points/W
862 points/W

Performance/GHz
i7-640LM
i7-720QM
Test#1 (Integers)
2627 points/GHz
1962 points/GHz
Test#2 (FP)
1718 points/GHz
1267 points/GHz
Test#3 (Generic, ZIP)
1024 points/GHz
717 points/GHz
Test#1 (Memory)
762 points/GHz
745 points/GHz
TOTAL
6130 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