Xeon E5-2666 V3 vs Core 2 Extreme QX6850
Aggregate performance score
Xeon E5-2666 V3 outperforms Core 2 Extreme QX6850 by a whopping 521% based on our aggregate benchmark results.
Primary details
Comparing Core 2 Extreme (Desktop) QX6850 and Xeon E5-2666 V3 processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 2185 | 865 |
| Place by popularity | not in top-100 | not in top-100 |
| Market segment | Desktop processor | Server |
| Series | Core 2 Extreme (Desktop) | no data |
| Power efficiency | 1.04 | 6.23 |
| Architecture codename | Kentsfield (2007) | Haswell-EP (2014−2015) |
| Release date | no data (2024 years ago) | 13 November 2014 (10 years ago) |
Detailed specifications
Core 2 Extreme (Desktop) QX6850 and Xeon E5-2666 V3 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) | 10 (Deca-Core) |
| Threads | 4 | 20 |
| Base clock speed | no data | 2.9 GHz |
| Boost clock speed | 3 GHz | 3.5 GHz |
| Bus rate | 1333 MHz | no data |
| L1 cache | 64K (per core) | 64K (per core) |
| L2 cache | 8 MB (shared) | 256K (per core) |
| L3 cache | 0 KB | 25 MB (shared) |
| Chip lithography | 65 nm | 22 nm |
| Die size | 2x 143 mm2 | 356 mm2 |
| Maximum case temperature (TCase) | 64 °C | no data |
| Number of transistors | 582 million | 2,600 million |
| 64 bit support | + | + |
| Windows 11 compatibility | - | no data |
| Unlocked multiplier | + | - |
Compatibility
Information on Core 2 Extreme (Desktop) QX6850 and Xeon E5-2666 V3 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 | 2 |
| Socket | 775 | 2011-3 |
| Power consumption (TDP) | 130 Watt | 135 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Core 2 Extreme (Desktop) QX6850 and Xeon E5-2666 V3. You'll probably need this information if you require some particular technology.
| AES-NI | - | + |
| AVX | - | + |
| vPro | no data | + |
| Enhanced SpeedStep (EIST) | + | + |
| TSX | - | + |
Security technologies
Core 2 Extreme (Desktop) QX6850 and Xeon E5-2666 V3 technologies aimed at improving security, for example, by protecting against hacks.
| TXT | no data | + |
Virtualization technologies
Virtual machine speed-up technologies supported by Core 2 Extreme (Desktop) QX6850 and Xeon E5-2666 V3 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 Extreme (Desktop) QX6850 and Xeon E5-2666 V3. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR1, DDR2, DDR3 | DDR3, DDR4 2133 MHz Quad-channel |
Peripherals
Specifications and connection of peripherals supported by Core 2 Extreme (Desktop) QX6850 and Xeon E5-2666 V3.
| PCIe version | no data | 3.0 |
| PCI Express lanes | no data | 40 |
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 | 1.44 | 8.94 |
| Physical cores | 4 | 10 |
| Threads | 4 | 20 |
| Chip lithography | 65 nm | 22 nm |
| Power consumption (TDP) | 130 Watt | 135 Watt |
Core 2 Extreme QX6850 has 3.8% lower power consumption.
Xeon E5-2666 V3, on the other hand, has a 520.8% higher aggregate performance score, 150% more physical cores and 400% more threads, and a 195.5% more advanced lithography process.
The Xeon E5-2666 V3 is our recommended choice as it beats the Core 2 Extreme QX6850 in performance tests.
Note that Core 2 Extreme QX6850 is a desktop processor while Xeon E5-2666 V3 is a server/workstation one.
Should you still have questions on choice between Core 2 Extreme QX6850 and Xeon E5-2666 V3, ask them in Comments section, and we shall answer.
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