Core i7-660UM vs Core 2 Quad Q8400
Aggregate performance score
Core 2 Quad Q8400 outperforms Core i7-660UM by an impressive 60% based on our aggregate benchmark results.
Primary details
Comparing Core 2 Quad Q8400 and Core i7-660UM processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 2281 | 2608 |
| Place by popularity | not in top-100 | not in top-100 |
| Market segment | Desktop processor | Laptop |
| Series | no data | Intel Core i7 |
| Power efficiency | 1.30 | 4.26 |
| Architecture codename | Yorkfield (2007−2009) | Arrandale (2010−2011) |
| Release date | 19 April 2009 (15 years ago) | 24 May 2010 (14 years ago) |
| Launch price (MSRP) | no data | $317 |
Detailed specifications
Core 2 Quad Q8400 and Core i7-660UM 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) | 2 (Dual-core) |
| Threads | 4 | 4 |
| Base clock speed | 2.66 GHz | 1.33 GHz |
| Boost clock speed | 0.67 GHz | 2.4 GHz |
| Bus type | no data | DMI 1.0 |
| Bus rate | 1333 MHz | 1 × 2.5 GT/s |
| Multiplier | no data | 10 |
| L1 cache | 64 KB (per core) | 64 KB (per core) |
| L2 cache | 4 MB (shared) | 256 KB (per core) |
| L3 cache | 0 KB | 4 MB (shared) |
| Chip lithography | 45 nm | 32 nm |
| Die size | 2x 82 mm2 | 81+144 mm2 |
| Maximum core temperature | no data | 105 °C |
| Maximum case temperature (TCase) | 71 °C | no data |
| Number of transistors | 456 million | 382+177 Million |
| 64 bit support | + | + |
| Windows 11 compatibility | - | - |
| VID voltage range | 0.85V-1.3625V | no data |
Compatibility
Information on Core 2 Quad Q8400 and Core i7-660UM 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 | 1 (Uniprocessor) |
| Socket | FCLGA775,LGA775 | BGA1288 |
| Power consumption (TDP) | 95 Watt | 18 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Core 2 Quad Q8400 and Core i7-660UM. You'll probably need this information if you require some particular technology.
| Instruction set extensions | no data | Intel® SSE4.1, Intel® SSE4.2 |
| AES-NI | - | + |
| FMA | - | + |
| vPro | no data | + |
| Enhanced SpeedStep (EIST) | + | + |
| Turbo Boost Technology | - | + |
| Hyper-Threading Technology | - | + |
| Idle States | + | + |
| Thermal Monitoring | + | + |
| Flex Memory Access | no data | + |
| Demand Based Switching | - | no data |
| PAE | no data | 36 Bit |
| FDI | no data | + |
| Fast Memory Access | no data | + |
| FSB parity | - | no data |
Security technologies
Core 2 Quad Q8400 and Core i7-660UM technologies aimed at improving security, for example, by protecting against hacks.
| TXT | - | + |
| EDB | + | + |
Virtualization technologies
Virtual machine speed-up technologies supported by Core 2 Quad Q8400 and Core i7-660UM are enumerated here.
| VT-d | no data | + |
| VT-x | + | + |
| EPT | no data | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Core 2 Quad Q8400 and Core i7-660UM. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR1, DDR2, DDR3 | DDR3-800 |
| Maximum memory size | no data | 8 GB |
| Max memory channels | no data | 2 |
| Maximum memory bandwidth | no data | 12.799 GB/s |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | On certain motherboards (Chipset feature) | Intel HD Graphics for Previous Generation Intel Processors |
| Clear Video | no data | + |
| Clear Video HD | no data | + |
| Graphics max frequency | no data | 500 MHz |
Graphics interfaces
Available interfaces and connections of Core 2 Quad Q8400 and Core i7-660UM integrated GPUs.
| Number of displays supported | no data | 2 |
Peripherals
Specifications and connection of peripherals supported by Core 2 Quad Q8400 and Core i7-660UM.
| PCIe version | 2.0 | 2.0 |
| 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.
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.
Pros & cons summary
| Performance score | 1.30 | 0.81 |
| Recency | 19 April 2009 | 24 May 2010 |
| Physical cores | 4 | 2 |
| Chip lithography | 45 nm | 32 nm |
| Power consumption (TDP) | 95 Watt | 18 Watt |
Core 2 Quad Q8400 has a 60.5% higher aggregate performance score, and 100% more physical cores.
i7-660UM, on the other hand, has an age advantage of 1 year, a 40.6% more advanced lithography process, and 427.8% lower power consumption.
The Core 2 Quad Q8400 is our recommended choice as it beats the Core i7-660UM in performance tests.
Note that Core 2 Quad Q8400 is a desktop processor while Core i7-660UM is a notebook one.
Should you still have questions on choice between Core 2 Quad Q8400 and Core i7-660UM, ask them in Comments section, and we shall answer.
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