Intel Core i7-640M vs Intel Core i7-660LM

Intel Core i7-640M

► remove Intel 640M

The Intel Core i7-640M is a high end dual core CPU for laptops and clocks (due to the Turbo Mode) from 2.8 to 3.46 GHz. Each core is based on the Nehalem (Westmere) micro-architecture. Hyperthreading enables the Dual Core CPU to handle 4 threads at once (for a better usage of the pipeline). Therefore, the i7-640M is related to the other i5 and i3 dual core CPUs and not the quad-core i7 CPUs.

A feature of the new Core i7-640M is the integrated graphics card called Intel HD Graphics (GMA HD) and memory controller. Both are on a separate die that is still manufactured in 45nm whereas the CPU die is already manufactured in the new 32nm process.

The 32nm cpu cores of the Westmere generation can also process some new instructions to accelerate AES encryptions. Compared to the slower i5 versions without AES features, the 3DMark Vantage Communication Score showed a significant increase with AES enabled CPUs.

The integrated Intel Graphics Media Accelerator HD (GMA HD) graphics card is clocked with 500-733 MHz and performs clearly faster than the old GMA 4500MHD. A GeForce 9400M (ION) should still be a bit faster (especially as Nvidia and ATI cards have a better driver support than Intel up to now).

The power consumption of 35 Watt TDP (max.) counts for the whole package and therefore it is clearly better than the 35 Watt TDP of the Core 2 Duo T-series (CPU alone).

The Core i7-640M should not be mistaken with the similar named but slower low voltage Core i7-640LM and Core i7-640UM models.

Intel Core i7-660LM

► remove Intel 660LM

The Intel Core i7-660LM is a fast middle class low voltage dual core CPU for laptops and clocks (due to the Turbo Mode) from 2.27 to 3.07 GHz. Each core is based on the Nehalem (Westmere) micro-architecture. Hyperthreading enables the Dual Core CPU to handle 4 threads at once (for a better usage of the pipeline).  All features (like Virtualization VT-x and VT-d, Trusted Execution) of the Arrandale core are activated in the 660LM. Compared to the Core i7-620M, the 660LM is slower but more power efficient.

A feature of the new Core i7-660LM is the integrated graphics card (called Intel HD Graphics) and memory controller. Both are on a separate die that is still manufactured in 45nm whereas the CPU die is already manufactured in the new 32nm process.

Due to the integrated memory controller, the HyperThreading and Turbo Boost, the  Core i7-660LM is faster than a similar clocked Core 2 Duo in all (us known) applications and benchmarks. The performance should be somewhere on the level of the Core i3-380M and i5-450M. Beware, that some designs may not feature the Turbo Boost or due to small cooling solutions, the TurboBoost may not trigger very often. Therefore, the performance could be worse.

The 32nm cpu cores of the Westmere generation can also process some new instructions to accelerate AES encryptions. Modern applications that support AES encoding can profit significantly using the new instructions (e.g. the Communications Suite test in the PCMark Vantage boosts up to 70% using AES in the faster Core i5-520M).

The integrated Intel Graphics Media Accelerator HD (GMA HD) graphics card is between 266-566 MHz (Turbo Boost) and therefore the base speed is clearly below the non low voltage versions. The performance should still be a lot faster than the old GMA 4500MHD.

The power consumption of 25 Watt TDP (max.) counts for the whole package and therefore it is clearly better than the 25 Watt TDP of the Core 2 Duo P-series (CPU alone).

Intel Core i7-640MIntel Core i7-660LM
Intel Core i7Intel Core i7
ArrandaleArrandale
: Core i7 Arrandale
» Intel Core i7-640M2800 - 3460 MHz2 / 44 MB
Intel Core i7-620M (compare)2660 - 3333 MHz2 / 44 MB
Intel Core i7-660LM2267 - 3067 MHz2 / 44 MB
Intel Core i7-640LM (compare)2130 - 2933 MHz2 / 44 MB
Intel Core i7-620LM (compare)2000 - 2800 MHz2 / 44 MB
Intel Core i7-680UM (compare)1467 - 2533 MHz2 / 44 MB
Intel Core i7-660UM (compare)1333 - 2400 MHz2 / 44 MB
Intel Core i7-640UM (compare)1200 - 2266 MHz2 / 44 MB
Intel Core i7-620UM (compare)1060 - 2133 MHz2 / 44 MB
Intel Core i7-640M2800 - 3460 MHz2 / 44 MB
Intel Core i7-620M (compare)2660 - 3333 MHz2 / 44 MB
» Intel Core i7-660LM2267 - 3067 MHz2 / 44 MB
Intel Core i7-640LM (compare)2130 - 2933 MHz2 / 44 MB
Intel Core i7-620LM (compare)2000 - 2800 MHz2 / 44 MB
Intel Core i7-680UM (compare)1467 - 2533 MHz2 / 44 MB
Intel Core i7-660UM (compare)1333 - 2400 MHz2 / 44 MB
Intel Core i7-640UM (compare)1200 - 2266 MHz2 / 44 MB
Intel Core i7-620UM (compare)1060 - 2133 MHz2 / 44 MB
2800 - 3460 MHz2267 - 3067 MHz
25002500
512 KB512 KB
4 MB4 MB
2 / 42 / 4
35 25
382+177 382+177
32 32
81+114 mm281+177 mm2
105 °C105 °C
BGA1288, PGA988BGA1288
Turbo Boost, Hyper Threading, Enhanced Speedstep, integrierte GMA HD 500-733MHz, Dual Channel DDR3 memory controllerTurbo Boost (2.93 GHz max), Hyper Threading, Enhanced Speedstep, integrated GMA HD 266-566MHz
$346 U.S.$346 U.S.
Intel Core i7 640MIntel Core i7 660LM

Cinebench R11.5 - CPU Multi 64Bit
100%
640M +
min: 2.4     avg: 2.5     median: 2.5 (9%)     max: 2.63 Points
Cinebench R11.5 - CPU Single 64Bit
100%
640M +
1.1 Points (43%)
Cinebench R10 - Rendering Single 32Bit
100%
640M +
min: 3597     avg: 3711     median: 3707.5 (41%)     max: 3792 Points
Cinebench R10 - Rendering Multiple CPUs 32Bit
100%
640M +
min: 7765     avg: 7986.9     median: 7906 (16%)     max: 8349 Points
Cinebench R10 - Rendering Multiple CPUs 64Bit
100%
640M +
min: 9096     avg: 9533     median: 9430 (12%)     max: 10027 Points
Cinebench R10 - Rendering Single CPUs 64Bit
100%
640M +
min: 4455     avg: 4562.5     median: 4573 (44%)     max: 4606 Points
wPrime 2.0x - 1024m *
100%
640M +
min: 523     avg: 708.4     median: 568.8 (7%)     max: 1173.06 seconds
wPrime 2.0x - 32m *
100%
640M +
min: 16.6     avg: 22.1     median: 17.6 (4%)     max: 36.611 seconds
WinRAR - Result
100%
640M +
1763 KB/s (21%)
TrueCrypt - Serpent Mean 100MB
100%
640M +
0.1 GB/s (0%)
TrueCrypt - Twofish Mean 100MB
100%
640M +
0.2 GB/s (8%)
TrueCrypt - AES Mean 100MB
100%
640M +
1.3 GB/s (7%)
3DMark 06 - CPU
100%
640M +
min: 3094     avg: 3284.6     median: 3307 (9%)     max: 3442 Points
Super Pi mod 1.5 XS 1M *
100%
640M +
min: 12     avg: 13.1     median: 12.3 (3%)     max: 18 Seconds
Super Pi mod 1.5 XS 2M *
100%
640M +
min: 30     avg: 32.8     median: 31 (1%)     max: 44 Seconds
Super Pi Mod 1.5 XS 32M *
100%
640M +
min: 735     avg: 758.4     median: 754 (3%)     max: 815 Seconds
PCMark 05 - Standard 1024x768
100%
640M +
min: 10087     avg: 10706     median: 10706 (67%)     max: 11325 Points
Windows 7 Experience Index - Processor
100%
640M +
min: 6.8     avg: 6.9     median: 6.9 (88%)     max: 7 points
3DMark Vantage - P CPU no PhysX 1280x1024
100%
640M +
min: 8589     avg: 8881.8     median: 8861 (15%)     max: 9216 Points
3DMark 11 - Performance Physics 1280x720
100%
640M +
3356 points (18%)

Average Benchmarks Intel Core i7-640M → 100%

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* Smaller numbers mean a higher performance
1 This benchmark is not used for the average calculation

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> Notebook / Laptop Reviews and News > Benchmarks / Tech > Processor Comparison - Head 2 Head
Redaktion, 2017-09- 8 (Update: 2017-09-11)