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

Intel Core i7-660UM

► remove from comparison Intel 660UM

The Intel Core i7-660UM is a Ultra Low Voltage dual-core processor for small and light laptops. It is clocked with 1.33 - 2.4 GHz (if Turbo Boost is enabled). The 660UM offers the highest TurboBoost of all 1.3 GHz clocked ULV processors (i3-380UM, i5-470UM, i5-560UM). 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). Compared to the Core i7-620M and the 640LM, the 660UM is much slower (due to the lower clock rate) but more power efficient.

A feature of the new Core i7-660UM 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 i7-660UM is faster than a similar clocked Core 2 Duo (1.33 GHz) in all (us known) applications and benchmarks. Still the Turbo Boost may not trigger very often (sometimes it is even not activated in the BIOS) and therefore the maximum of 2.4 GHz is not very important. All in all the I7-660UM should be faster than a Core 2 Duo SL9300 (1.6GHz).

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 166-500 MHz (Turbo Boost) and therefore the base speed is clearly below the non low voltage versions. The performance should still be faster than the old GMA 4500MHD.

Intel Core i7-640M

► remove from comparison 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 i7-660UMIntel Core i7-640M
Intel Core i7Intel Core i7
ArrandaleArrandale
Series: Core i7 Arrandale
Intel Core i7-640M2.8 - 3.46 GHz2 / 44 MB
Intel Core i7-620M compare2.66 - 3.33 GHz2 / 44 MB
Intel Core i7-660LM compare2.27 - 3.07 GHz2 / 44 MB
Intel Core i7-640LM compare2.13 - 2.93 GHz2 / 44 MB
Intel Core i7-620LM compare2 - 2.8 GHz2 / 44 MB
Intel Core i7-680UM compare1.47 - 2.53 GHz2 / 44 MB
» Intel Core i7-660UM1.33 - 2.4 GHz2 / 44 MB
Intel Core i7-640UM compare1.2 - 2.27 GHz2 / 44 MB
Intel Core i7-620UM compare1.06 - 2.13 GHz2 / 44 MB
» Intel Core i7-640M2.8 - 3.46 GHz2 / 44 MB
Intel Core i7-620M compare2.66 - 3.33 GHz2 / 44 MB
Intel Core i7-660LM compare2.27 - 3.07 GHz2 / 44 MB
Intel Core i7-640LM compare2.13 - 2.93 GHz2 / 44 MB
Intel Core i7-620LM compare2 - 2.8 GHz2 / 44 MB
Intel Core i7-680UM compare1.47 - 2.53 GHz2 / 44 MB
Intel Core i7-660UM1.33 - 2.4 GHz2 / 44 MB
Intel Core i7-640UM compare1.2 - 2.27 GHz2 / 44 MB
Intel Core i7-620UM compare1.06 - 2.13 GHz2 / 44 MB
1333 - 2400 MHz2800 - 3460 MHz
25002500
512 KB512 KB
4 MB4 MB
2 / 42 / 4
18 35
382+177 382+177
32 32
81+144 mm281+114 mm2
105 °C105 °C
BGA1288BGA1288, PGA988
Turbo Boost (2.40 GHz max), Hyper Threading, Enhanced Speedstep, integrated GMA HD 166-500MHzTurbo Boost, Hyper Threading, Enhanced Speedstep, integrierte GMA HD 500-733MHz, Dual Channel DDR3 memory controller
Architecturex86x86
$346 U.S.
Intel Core i7 640M

Benchmarks

Cinebench R11.5 - Cinebench R11.5 CPU Multi 64 Bit
100%
1 640M +
min: 2.4     avg: 2.5     median: 2.5 (5%)     max: 2.63 Points
Cinebench R11.5 - Cinebench R11.5 CPU Single 64 Bit
100%
1 640M +
1.1 Points (34%)
Cinebench R10 - Cinebench R10 Rend. Single (32bit)
100%
1 640M +
min: 3597     avg: 3711     median: 3707.5 (33%)     max: 3792
Cinebench R10 - Cinebench R10 Rend. Multi (32bit)
100%
1 640M +
min: 7765     avg: 7987     median: 7906 (13%)     max: 8349
Cinebench R10 - Cinebench R10 Rend. Multi (64bit)
100%
1 640M +
min: 9096     avg: 9533     median: 9430 (9%)     max: 10027 Points
Cinebench R10 - Cinebench R10 Rend. Single (64bit)
100%
1 640M +
min: 4455     avg: 4563     median: 4573 (32%)     max: 4606 Points
wPrime 2.10 - wPrime 2.0 1024m *
100%
1 640M +
min: 523     avg: 708     median: 568.8 (7%)     max: 1173.06 s
wPrime 2.10 - wPrime 2.0 32m *
100%
1 640M +
min: 16.6     avg: 22.1     median: 17.6 (4%)     max: 36.611 s
WinRAR - WinRAR 4.0
100%
1 640M +
1763 (11%)
TrueCrypt - TrueCrypt Serpent
100%
1 640M +
0.1 GB/s (5%)
TrueCrypt - TrueCrypt Twofish
100%
1 640M +
0.2 GB/s (5%)
TrueCrypt - TrueCrypt AES
100%
1 640M +
1.3 GB/s (5%)
3DMark 06 - CPU - 3DMark 06 - CPU
100%
1 640M +
min: 3094     avg: 3285     median: 3307 (18%)     max: 3442 Points
Super Pi mod 1.5 XS 1M - Super Pi mod 1.5 XS 1M *
100%
1 640M +
min: 12     avg: 13.1     median: 12.3 (3%)     max: 18 s
Super Pi mod 1.5 XS 2M - Super Pi mod 1.5 XS 2M *
100%
1 640M +
min: 30     avg: 32.7     median: 31 (1%)     max: 44 s
Super Pi Mod 1.5 XS 32M - Super Pi mod 1.5 XS 32M *
100%
1 640M +
min: 735     avg: 758     median: 754 (3%)     max: 815 s
PCMark 05 - PCMark 05 - Standard
100%
1 640M +
min: 10087     avg: 10706     median: 10706 (67%)     max: 11325 Points
Windows 7 Experience Index - Win7 CPU
100%
1 640M +
min: 6.8     avg: 6.9     median: 6.9 (88%)     max: 7 Points
3DMark Vantage - 3DM Vant. Perf. CPU no Physx
100%
1 640M +
min: 8589     avg: 8882     median: 8861 (10%)     max: 9216 Points
3DMark 11 - 3DM11 Performance Physics
100%
1 640M +
3356 Points (12%)

Average Benchmarks Intel Core i7-640M → NAN% n=

- Range of benchmark values for this graphics card
- Average benchmark values for this graphics card
* Smaller numbers mean a higher performance
1 This benchmark is not used for the average calculation

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Redaktion, 2017-09- 8 (Update: 2017-09-11)