Core i7-840QM vs Core i7-2840QM
Aggregate performance score
i7-2840QM outperforms i7-840QM by an impressive 97% based on our aggregate benchmark results.
Primary details
Comparing Core i7-2840QM and Core i7-840QM processor market type (desktop or notebook), architecture, sales start time and price.
| Place in performance ranking | 1674 | 2210 |
| Place by popularity | not in top-100 | not in top-100 |
| Market segment | Laptop | Laptop |
| Series | Intel Core i7 | Intel Core i7 |
| Architecture codename | Sandy Bridge (2011−2013) | Clarksfield (2009−2010) |
| Release date | 4 September 2011 (12 years ago) | 20 June 2010 (14 years ago) |
| Launch price (MSRP) | no data | $568 |
| Current price | no data | $191 (0.3x MSRP) |
Detailed specifications
Core i7-2840QM and Core i7-840QM basic parameters such as number of cores, number of threads, base frequency and turbo boost clock, lithography, cache size and multiplier lock state. These parameters indirectly say of CPU speed, though for more precise assessment you have to consider their test results.
| Physical cores | 4 (Quad-Core) | 4 (Quad-Core) |
| Threads | 8 | 8 |
| Base clock speed | no data | 1.86 GHz |
| Boost clock speed | 2.4 GHz | 3.2 GHz |
| Bus support | 4 × 5 GT/s | 2500 MHz |
| L1 cache | 256 KB | 64 KB (per core) |
| L2 cache | 1 MB | 256 KB (per core) |
| L3 cache | 8 MB | 8 MB (shared) |
| Chip lithography | 32 nm | 45 nm |
| Die size | 216 mm2 | 296 mm2 |
| Maximum core temperature | no data | 100 °C |
| Number of transistors | 1160 Million | 774 million |
| 64 bit support | + | + |
| Windows 11 compatibility | - | - |
| Unlocked multiplier | No | No |
Compatibility
Information on Core i7-2840QM and Core i7-840QM compatibility with other computer components: motherboard (look for socket type), power supply unit (look for power consumption) etc. Useful when planning a future computer configuration or upgrading an existing one. Note that power consumption of some processors can well exceed their nominal TDP, even without overclocking. Some can even double their declared thermals given that the motherboard allows to tune the CPU power parameters.
| Number of CPUs in a configuration | 1 (Uniprocessor) | 1 |
| Socket | Socket G2 | FCPGA988,PGA988 |
| Power consumption (TDP) | 45 Watt | 45 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Core i7-2840QM and Core i7-840QM. You'll probably need this information if you require some particular technology.
| Instruction set extensions | no data | Intel® SSE4.2 |
| AES-NI | + | - |
| FMA | + | no data |
| AVX | + | no data |
| vPro | + | + |
| Enhanced SpeedStep (EIST) | + | + |
| Turbo Boost Technology | no data | + |
| Hyper-Threading Technology | no data | + |
| Idle States | no data | + |
| Thermal Monitoring | no data | + |
| PAE | no data | 36 Bit |
| Status | no data | Discontinued |
Security technologies
Core i7-2840QM and Core i7-840QM technologies aimed at improving security, for example, by protecting against hacks.
| TXT | + | + |
| EDB | no data | + |
Virtualization technologies
Virtual machine speed-up technologies supported by Core i7-2840QM and Core i7-840QM are enumerated here.
| VT-d | + | + |
| VT-x | + | + |
| EPT | no data | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Core i7-2840QM and Core i7-840QM. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | no data | DDR3 |
| Maximum memory size | 32 GB | 8 GB |
| Max memory channels | no data | 2 |
| Maximum memory bandwidth | 25.598 GB/s | 21 GB/s |
| ECC memory support | no data | - |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | Intel HD Graphics 3000 | None |
Peripherals
Specifications and connection of peripherals supported by Core i7-2840QM and Core i7-840QM.
| PCIe version | no data | 2 |
| PCI Express lanes | no data | 16 |
Synthetic benchmark performance
Various benchmark results of the processors in comparison. Overall score is measured in points in 0-100 range, higher is better.
Combined synthetic benchmark score
This is our combined benchmark performance rating. We are regularly improving our combining algorithms, but if you find some perceived inconsistencies, feel free to speak up in comments section, we usually fix problems quickly.
Core i7-2840QM outperforms Core i7-840QM by 97% based on our aggregate benchmark results.
Passmark
Passmark CPU Mark is a widespread benchmark, consisting of 8 different types of workload, including integer and floating point math, extended instructions, compression, encryption and physics calculation. There is also one separate single-threaded scenario measuring single-core performance.
Benchmark coverage: 68%
Core i7-2840QM outperforms Core i7-840QM by 98% in Passmark.
Pros & cons summary
| Performance score | 2.48 | 1.26 |
| Recency | 4 September 2011 | 20 June 2010 |
| Chip lithography | 32 nm | 45 nm |
The Core i7-2840QM is our recommended choice as it beats the Core i7-840QM in performance tests.
Should you still have questions on choice between Core i7-2840QM and Core i7-840QM, ask them in Comments section, and we shall answer.
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