Intel Core i7-840QM vs Intel Core i7-940XM
Intel Core i7-840QM
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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 i7-940XM
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The Intel Core i7 940XM Extreme Edition is a high-end processor the fastest laptop processor at the time of announcement. 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 3.3 GHz in single threaded applications. Using two cores, the CPU can clock up to 3.2 GHz and using all 4 cores, 2.4 GHz is the maximum clock rate. Therefore, even older games (single threaded) should run fluently with this mobile CPU altough the base clock speed is rather slow. The 940XM should provide enough power for all modern games and applications (in 2010).
The Core i7 9xx 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.
Core architecture is still very similar to the one used in the Core 2 CPUs.
The power consumption of up to 55 Watt (TDP) is quite high for a laptop CPU and because of the Turbo Mode, the power consumption should reach these high values.
| Model | Intel Core i7-840QM | Intel Core i7-940XM | ||||||||||||||||||||||||||||||||||||||||||||||||
| Codename | Clarksfield | Clarksfield | ||||||||||||||||||||||||||||||||||||||||||||||||
| Series | Intel Core i7 | Intel Core i7 | ||||||||||||||||||||||||||||||||||||||||||||||||
| Series: Core i7 Clarksfield |
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| Clock | 1860 - 3200 MHz | 2130 - 3333 MHz | ||||||||||||||||||||||||||||||||||||||||||||||||
| FSB | 2500 | 2500 | ||||||||||||||||||||||||||||||||||||||||||||||||
| L1 Cache | 256 KB | 256 KB | ||||||||||||||||||||||||||||||||||||||||||||||||
| L2 Cache | 1 MB | 1 MB | ||||||||||||||||||||||||||||||||||||||||||||||||
| L3 Cache | 8 MB | 8 MB | ||||||||||||||||||||||||||||||||||||||||||||||||
| Cores / Threads | 4 / 8 | 4 / 8 | ||||||||||||||||||||||||||||||||||||||||||||||||
| TDP | 45 Watt | 55 Watt | ||||||||||||||||||||||||||||||||||||||||||||||||
| Transistors | 774 Million | 774 Million | ||||||||||||||||||||||||||||||||||||||||||||||||
| Technology | 45 nm | 45 nm | ||||||||||||||||||||||||||||||||||||||||||||||||
| Die Size | 296 mm2 | 296 mm2 | ||||||||||||||||||||||||||||||||||||||||||||||||
| max. Temp. | 100 °C | 100 °C | ||||||||||||||||||||||||||||||||||||||||||||||||
| Socket | RPGA989 | RPGA989 | ||||||||||||||||||||||||||||||||||||||||||||||||
| Features | integrated 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 | 2.5 GT/s DMI, Virtualization Technology, Execute Disable Bit, Enahnced Speedstep Technology, Enhanced Halt State (C1E), 64, Turbo Boost (max. 3.33 GHz), Hyper-Threading, Trusted Execution Technology | ||||||||||||||||||||||||||||||||||||||||||||||||
| Architecture | x86 | x86 | ||||||||||||||||||||||||||||||||||||||||||||||||
| $568 U.S. | $1096 U.S. | |||||||||||||||||||||||||||||||||||||||||||||||||
| Announced | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Manufacturer | ark.intel.com | ark.intel.com |
Benchmarks
Average Benchmarks Intel Core i7-840QM → 100% n=15
Average Benchmarks Intel Core i7-940XM → 117% n=15
- Average benchmark values for this graphics card* Smaller numbers mean a higher performance
1 This benchmark is not used for the average calculation
