Intel Core i7-740QM vs Intel Core i7-840QM

Intel Core i7-740QM

► remove Intel 740QM

The Intel Core i7-740QM is a fast quad-core CPU for laptops. Compared to the Core i7-720QM, the 740QM features a higher clock rate. It features 4 cores and Hyperthreading. Therefore, 8 threads can be worked on simultaneously. Compared to the faster Core i7 mobile CPUs, the 740QM only features 6MB L3 Cache (the faster ones 8 MB).

Because of the Turbo Mode, the CPU can be clocked with up to 2.93 GHz (1 core only) and therefore fast for single core applications like older games. Thanks to the 4 cores (and 8 threads), modern multi-threaded applications also profit from this CPU greatly (altough when using all cores, the clock speed remains low).

The Core i7 7xx line has an integrated memory controller for DDR3 bars (1066 or 1333). Therefore, the memory performance is very good (compared to older CPUs with external memory controllers). Still this also leads to the higher TDP of the whole chip.

The performance depends on the used thread count. If all cores are fully used, the performance of the 740QM is on a level with the fast Core i5-2520M (Sandy Bridge). If only a single core / thread is fully used, the performance depends on the Turbo Boost. Benchmarks indicate a performance on a level of the Core i5-480M.

The power consumption of up to 45 Watt (TDP) is quite high for a laptop CPU and because of the Turbo Mode, the power consumption could reach these high values. Therefore, only large laptops with good cooling solutions can house this CPU.

Intel Core i7-840QM

► remove Intel 840QM

The Intel Core i7 840QM is a high end quad core CPU in 2010. It features 4 cores (quad core CPU) and Hyperthreading. Therefore, 8 threads can be worked on simultaneously.

Because of the Turbo Mode, the CPU is clocked with up to 3.2 GHz (if only one core is used, 2.93 for two cores, and 2 ghz with 4 cores) and therefore can perform very well in single core applications like older games.

The Core i7 line has an integrated memory controller for DDR3 bars (1066 or 1333) supporting a maximum of 8 GB. Therefore, the memory performance is very good (compared to older CPUs with external memory controllers). Still, this also leads to the higher TDP of the whole chip. ECC memory is not supported by the 840QM.

The Core micro-architecture is still very similar to the one used in the Core 2 CPUs, therefore the performance per MHz (neglecting the integrated memory controller, hyperthreading and Turbo Boost) is similar.

The power consumption of up to 45 Watt (TDP) is quite high for a laptop CPU and because of the Turbo Mode, the power consumption should reach these high values. Therefore, the CPU is only suited for large laptops.

Intel Core i7-740QMIntel Core i7-840QM
Intel Core i7Intel Core i7
ClarksfieldClarksfield
: Core i7 Clarksfield
Intel Core i7-940XM (compare)2130 - 3333 MHz4 / 88 MB
Intel Core i7-920XM (compare)2000 - 3200 MHz4 / 88 MB
Intel Core i7-840QM1860 - 3200 MHz4 / 88 MB
Intel Core i7-820QM (compare)1730 - 3060 MHz4 / 88 MB
» Intel Core i7-740QM1730 - 2930 MHz4 / 86 MB
Intel Core i7-720QM (compare)1600 - 2800 MHz4 / 86 MB
Intel Core i7-940XM (compare)2130 - 3333 MHz4 / 88 MB
Intel Core i7-920XM (compare)2000 - 3200 MHz4 / 88 MB
» Intel Core i7-840QM1860 - 3200 MHz4 / 88 MB
Intel Core i7-820QM (compare)1730 - 3060 MHz4 / 88 MB
Intel Core i7-740QM1730 - 2930 MHz4 / 86 MB
Intel Core i7-720QM (compare)1600 - 2800 MHz4 / 86 MB
1730 - 2930 MHz1860 - 3200 MHz
25002500
256 KB256 KB
1 MB1 MB
6 MB8 MB
4 / 84 / 8
45 45
774 774
45 45
296 mm2296 mm2
100 °C100 °C
PGA988RPGA989
Turbo Boost max. 2.93GHzintegrated DDR3-1066/1333 dual-channel memory controller, Turbo Boost, Hyper Threading, Virtualization Technology VT-x / VT-d, Trusted Execution Technology, Intel 64, Idel States, Enhanced Speedstep, Thermal Monitoring, Execute Disable Bit
$546 U.S.$568 U.S.
Intel Core i7 740QMIntel Core i7 840QM

Cinebench R11.5 - CPU Multi 64Bit
min: 2     avg: 3.1     median: 3 (7%)     max: 3 Points
3.3 Points (8%)
Cinebench R10 - Rendering Single 32Bit
min: 2933     avg: 3094.8     median: 3082 (32%)     max: 3313 Points
min: 3354     avg: 3426.3     median: 3438 (35%)     max: 3474 Points
Cinebench R10 - Rendering Multiple CPUs 32Bit
min: 8364     avg: 8865     median: 8930 (14%)     max: 9486 Points
min: 9007     avg: 9316.3     median: 9266 (14%)     max: 9726 Points
Cinebench R10 - Rendering Multiple CPUs 64Bit
min: 10265     avg: 10893.6     median: 10926 (14%)     max: 11680 Points
min: 11085     avg: 11521.2     median: 11513 (15%)     max: 11857 Points
Cinebench R10 - Rendering Single CPUs 64Bit
min: 3725     avg: 3878.1     median: 3873 (37%)     max: 4171 Points
min: 4083     avg: 4200     median: 4199 (41%)     max: 4319 Points
wPrime 2.0x - 1024m *
min: 427     avg: 730.3     median: 519 (6%)     max: 1460 seconds
min: 476     avg: 1014.4     median: 1282 (15%)     max: 1284 seconds
wPrime 2.0x - 32m *
min: 13     avg: 16     median: 15 (3%)     max: 19 seconds
min: 15     avg: 32     median: 39 (8%)     max: 40 seconds
3DMark 06 - CPU
min: 3158     avg: 3334.5     median: 3318 (22%)     max: 3609 Points
min: 3435     avg: 3518.8     median: 3531 (24%)     max: 3577 Points
Super Pi mod 1.5 XS 1M *
min: 14     avg: 14.6     median: 14 (3%)     max: 15 Seconds
13.1 Seconds (3%)
Super Pi mod 1.5 XS 2M *
min: 32     avg: 33.8     median: 33 (1%)     max: 35 Seconds
min: 29     avg: 29.4     median: 29 (1%)     max: 30 Seconds
Super Pi Mod 1.5 XS 32M *
min: 784     avg: 812.7     median: 809 (4%)     max: 861 Seconds
min: 727     avg: 734.2     median: 737 (3%)     max: 738 Seconds
SiSoft Sandra Dhrystone (MIPS)
min: 43330     avg: 47420     median: 47420 (23%)     max: 51510 MIPS
54820 MIPS (26%)
SiSoft Sandra Whetstone (MFLOPS)
min: 35310     avg: 40900     median: 36100 (28%)     max: 51290 MFLOPS
38190 MFLOPS (29%)
PCMark 05 - Standard 1024x768
min: 6675     avg: 6831     median: 6831 (43%)     max: 6987 Points
Windows 7 Experience Index - Processor
7.1 points (101%)
7.2 points (103%)
3DMark Vantage - P CPU no PhysX 1280x1024
min: 10808     avg: 11460.8     median: 11601 (16%)     max: 12016 Points
min: 12224     avg: 14498.3     median: 12238 (17%)     max: 19033 Points
3DMark 11 - Performance Physics 1280x720
min: 4204     avg: 4406.4     median: 4450 (23%)     max: 4533 points
4686 points (24%)

Average Benchmarks Intel Core i7-740QM → 100%

Average Benchmarks Intel Core i7-840QM → 103%

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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)