Core 2 Duo E6750 vs Core 2 Quad Q9400
Aggregate performance score
Core 2 Quad Q9400 outperforms Core 2 Duo E6750 by a whopping 111% based on our aggregate benchmark results.
Primary details
Comparing Core 2 Quad Q9400 and Core 2 Duo E6750 processor market type (desktop or notebook), architecture, sales start time and price.
| Place in performance ranking | 2143 | 2649 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | 3.51 | 5.17 |
| Market segment | Desktop processor | Desktop processor |
| Architecture codename | Yorkfield (2007−2009) | Conroe (2006−2007) |
| Release date | August 2008 (15 years ago) | July 2007 (17 years ago) |
| Current price | $73 | $61 |
Cost-effectiveness evaluation
Performance per price, higher is better.
Core 2 Duo E6750 has 47% better value for money than Core 2 Quad Q9400.
Detailed specifications
Core 2 Quad Q9400 and Core 2 Duo E6750 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 | 2.66 GHz | 2.66 GHz |
| Boost clock speed | 2.67 GHz | 2.67 GHz |
| L1 cache | 64K (per core) | 64 KB |
| L2 cache | 6 MB (shared) | 4 MB |
| L3 cache | 0 KB | 0 KB |
| Chip lithography | 45 nm | 65 nm |
| Die size | 2x 81 mm2 | 143 mm2 |
| Maximum core temperature | 71 °C | 72 °C |
| Maximum case temperature (TCase) | 71 °C | no data |
| Number of transistors | 456 million | 291 million |
| 64 bit support | + | + |
| Windows 11 compatibility | - | - |
| Unlocked multiplier | No | No |
| VID voltage range | 0.85V-1.3625V | 0.85V-1.5V |
Compatibility
Information on Core 2 Quad Q9400 and Core 2 Duo E6750 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 | LGA775 | PLGA775 |
| Power consumption (TDP) | 95 Watt | 65 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Core 2 Quad Q9400 and Core 2 Duo E6750. You'll probably need this information if you require some particular technology.
| AES-NI | - | - |
| Enhanced SpeedStep (EIST) | + | + |
| Turbo Boost Technology | - | - |
| Hyper-Threading Technology | - | - |
| Idle States | + | + |
| Thermal Monitoring | + | + |
| Demand Based Switching | - | - |
| FSB parity | - | - |
| Status | Discontinued | Discontinued |
Security technologies
Core 2 Quad Q9400 and Core 2 Duo E6750 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 Q9400 and Core 2 Duo E6750 are enumerated here.
| VT-d | + | no data |
| VT-x | + | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Core 2 Quad Q9400 and Core 2 Duo E6750. 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.
Core 2 Quad Q9400 outperforms Core 2 Duo E6750 by 111% 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 2 Quad Q9400 outperforms Core 2 Duo E6750 by 110% in Passmark.
GeekBench 5 Single-Core
GeekBench 5 Single-Core is a cross-platform application developed in the form of CPU tests that independently recreate certain real-world tasks with which to accurately measure performance. This version uses only a single CPU core.
Benchmark coverage: 42%
Core 2 Quad Q9400 outperforms Core 2 Duo E6750 by 14% in GeekBench 5 Single-Core.
GeekBench 5 Multi-Core
GeekBench 5 Multi-Core is a cross-platform application developed in the form of CPU tests that independently recreate certain real-world tasks with which to accurately measure performance. This version uses all available CPU cores.
Benchmark coverage: 42%
Core 2 Quad Q9400 outperforms Core 2 Duo E6750 by 88% in GeekBench 5 Multi-Core.
Pros & cons summary
| Performance score | 1.37 | 0.65 |
| Physical cores | 4 | 2 |
| Threads | 4 | 2 |
| Chip lithography | 45 nm | 65 nm |
| Power consumption (TDP) | 95 Watt | 65 Watt |
The Core 2 Quad Q9400 is our recommended choice as it beats the Core 2 Duo E6750 in performance tests.
Should you still have questions on choice between Core 2 Quad Q9400 and Core 2 Duo E6750, ask them in Comments section, and we shall answer.
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