Core 2 Duo E6400 vs Core 2 Extreme QX6700
Aggregate performance score
Core 2 Extreme QX6700 outperforms Core 2 Duo E6400 by a whopping 171% based on our aggregate benchmark results.
Primary details
Comparing Core 2 Extreme (Desktop) QX6700 and Core 2 Duo E6400 processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 2262 | 2903 |
| Place by popularity | not in top-100 | not in top-100 |
| Market segment | Desktop processor | Desktop processor |
| Series | Core 2 Extreme (Desktop) | no data |
| Power efficiency | 0.97 | 0.71 |
| Architecture codename | Kentsfield (2007) | Conroe (2006−2007) |
| Release date | no data | July 2006 (18 years ago) |
Detailed specifications
Core 2 Extreme (Desktop) QX6700 and Core 2 Duo E6400 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 | 2 |
| Base clock speed | no data | 2.13 GHz |
| Boost clock speed | 2.67 GHz | 2.13 GHz |
| Bus rate | 1066 MHz | 1066 MHz |
| L1 cache | 64K (per core) | 64 KB |
| L2 cache | 8 MB (shared) | 2 MB |
| L3 cache | 0 KB | 0 KB |
| Chip lithography | 65 nm | 65 nm |
| Die size | 2x 143 mm2 | 143 mm2 |
| Maximum core temperature | no data | 61 °C |
| Maximum case temperature (TCase) | 64 °C | no data |
| Number of transistors | 582 million | 291 million |
| 64 bit support | + | + |
| Windows 11 compatibility | - | - |
| Unlocked multiplier | + | - |
| VID voltage range | no data | 0.85V-1.5V |
Compatibility
Information on Core 2 Extreme (Desktop) QX6700 and Core 2 Duo E6400 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 |
| Socket | 775 | LGA775,PLGA775 |
| Power consumption (TDP) | 130 Watt | 65 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Core 2 Extreme (Desktop) QX6700 and Core 2 Duo E6400. You'll probably need this information if you require some particular technology.
| Enhanced SpeedStep (EIST) | + | + |
| Turbo Boost Technology | no data | - |
| Hyper-Threading Technology | no data | - |
| Idle States | no data | + |
| Thermal Monitoring | - | + |
| Demand Based Switching | no data | - |
| FSB parity | no data | - |
Security technologies
Core 2 Extreme (Desktop) QX6700 and Core 2 Duo E6400 technologies aimed at improving security, for example, by protecting against hacks.
| TXT | no data | - |
| EDB | no data | + |
Virtualization technologies
Virtual machine speed-up technologies supported by Core 2 Extreme (Desktop) QX6700 and Core 2 Duo E6400 are enumerated here.
| VT-x | no data | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Core 2 Extreme (Desktop) QX6700 and Core 2 Duo E6400. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR1, DDR2, DDR3 | DDR1, DDR2, DDR3 |
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 | 1.33 | 0.49 |
| Physical cores | 4 | 2 |
| Threads | 4 | 2 |
| Power consumption (TDP) | 130 Watt | 65 Watt |
Core 2 Extreme QX6700 has a 171.4% higher aggregate performance score, and 100% more physical cores and 100% more threads.
Core 2 Duo E6400, on the other hand, has 100% lower power consumption.
The Core 2 Extreme QX6700 is our recommended choice as it beats the Core 2 Duo E6400 in performance tests.
Should you still have questions on choice between Core 2 Extreme QX6700 and Core 2 Duo E6400, ask them in Comments section, and we shall answer.
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