Athlon II X4 645 vs Core 2 Quad Q9400
Aggregated performance score
Athlon II X4 645 outperforms Core 2 Quad Q9400 by a moderate 11% based on our aggregated benchmark results.
Primary details
Comparing Core 2 Quad Q9400 and Athlon II X4 645 processor market type (desktop or notebook), architecture, sales start time and price.
| Place in performance ranking | 2121 | 2027 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | 3.51 | 3.30 |
| Market segment | Desktop processor | Desktop processor |
| Architecture codename | Yorkfield (2007−2009) | Propus (2009−2011) |
| Release date | August 2008 (15 years ago) | 21 September 2010 (13 years ago) |
| Launch price (MSRP) | no data | $80 |
| Current price | $84 | $40 (0.5x MSRP) |
Cost-effectiveness evaluation
Performance per price, higher is better.
Core 2 Quad Q9400 has 6% better value for money than Athlon II X4 645.
Detailed specifications
Core 2 Quad Q9400 and Athlon II X4 645 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 | 4 | 4 |
| Base clock speed | 2.66 GHz | 3.1 GHz |
| Boost clock speed | 2.67 GHz | 3.1 GHz |
| L1 cache | 64K (per core) | 128 KB (per core) |
| L2 cache | 6 MB (shared) | 512 KB (per core) |
| L3 cache | 0 KB | 0 KB |
| Chip lithography | 45 nm | 45 nm |
| Die size | 2x 81 mm2 | 169 mm2 |
| Maximum core temperature | 71 °C | no data |
| Maximum case temperature (TCase) | 71 °C | no data |
| Number of transistors | 456 million | 300 million |
| 64 bit support | + | + |
| Windows 11 compatibility | - | - |
| Unlocked multiplier | No | No |
| VID voltage range | 0.85V-1.3625V | no data |
Compatibility
Information on Core 2 Quad Q9400 and Athlon II X4 645 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 | AM3 |
| Power consumption (TDP) | 95 Watt | 95 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Core 2 Quad Q9400 and Athlon II X4 645. You'll probably need this information if you require some particular technology.
| AES-NI | - | no data |
| Enhanced SpeedStep (EIST) | + | no data |
| Turbo Boost Technology | - | no data |
| Hyper-Threading Technology | - | no data |
| Idle States | + | no data |
| Thermal Monitoring | + | no data |
| Demand Based Switching | - | no data |
| FSB parity | - | no data |
| Status | Discontinued | no data |
Security technologies
Core 2 Quad Q9400 and Athlon II X4 645 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 Quad Q9400 and Athlon II X4 645 are enumerated here.
| VT-d | + | no data |
| VT-x | + | no data |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Core 2 Quad Q9400 and Athlon II X4 645. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR1, DDR2, DDR3 | DDR3 |
Peripherals
Specifications and connection of peripherals supported by Core 2 Quad Q9400 and Athlon II X4 645.
| PCIe version | no data | 2.0 |
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.
Athlon II X4 645 outperforms Core 2 Quad Q9400 by 11% based on our aggregated 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%
Athlon II X4 645 outperforms Core 2 Quad Q9400 by 11% 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 Athlon II X4 645 by 5% 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%
Athlon II X4 645 outperforms Core 2 Quad Q9400 by 5% in GeekBench 5 Multi-Core.
Similar processor comparisons
We picked several similar comparisons of processors in the same market segment and performance relatively close to those reviewed on this page.
