Athlon II X4 651K vs Xeon E5440
Primary details
Comparing Xeon E5440 and Athlon II X4 651K processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 2144 | not rated |
| Place by popularity | not in top-100 | not in top-100 |
| Market segment | Server | Desktop processor |
| Power efficiency | 1.76 | no data |
| Architecture codename | no data | Llano (2011−2012) |
| Release date | 1 January 2008 (16 years ago) | 14 November 2011 (13 years ago) |
Detailed specifications
Xeon E5440 and Athlon II X4 651K 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 | no data | 4 (Quad-Core) |
| Threads | no data | 4 |
| Base clock speed | 2.83 GHz | 3 GHz |
| Boost clock speed | no data | 3 GHz |
| L1 cache | no data | 128 KB (per core) |
| L2 cache | no data | 1 MB (per core) |
| L3 cache | 12 MB L2 Cache | 0 KB |
| Chip lithography | 45 nm | 32 nm |
| Die size | no data | 228 mm2 |
| Maximum core temperature | 67 °C | no data |
| Number of transistors | no data | 1,178 million |
| 64 bit support | + | + |
| Windows 11 compatibility | - | - |
| VID voltage range | 0.85V-1.35V | no data |
Compatibility
Information on Xeon E5440 and Athlon II X4 651K 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 | no data | 1 |
| Socket | LGA771 | FM1 |
| Power consumption (TDP) | 80 Watt | 100 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Xeon E5440 and Athlon II X4 651K. You'll probably need this information if you require some particular technology.
| Enhanced SpeedStep (EIST) | + | no data |
| 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
Xeon E5440 and Athlon II X4 651K 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 Xeon E5440 and Athlon II X4 651K are enumerated here.
| AMD-V | - | + |
| VT-x | + | no data |
| EPT | - | no data |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Xeon E5440 and Athlon II X4 651K. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | no data | DDR3 |
Pros & cons summary
| Recency | 1 January 2008 | 14 November 2011 |
| Chip lithography | 45 nm | 32 nm |
| Power consumption (TDP) | 80 Watt | 100 Watt |
Xeon E5440 has 25% lower power consumption.
Athlon II X4 651K, on the other hand, has an age advantage of 3 years, and a 40.6% more advanced lithography process.
We couldn't decide between Xeon E5440 and Athlon II X4 651K. We've got no test results to judge.
Be aware that Xeon E5440 is a server/workstation processor while Athlon II X4 651K is a desktop one.
Should you still have questions on choice between Xeon E5440 and Athlon II X4 651K, ask them in Comments section, and we shall answer.
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