Pentium D 820 vs Xeon X5675
Aggregate performance score
Xeon X5675 outperforms Pentium D 820 by a whopping 1200% based on our aggregate benchmark results.
Primary details
Comparing Xeon X5675 and Pentium D 820 processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 1410 | 3084 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | 4.08 | no data |
| Market segment | Server | Desktop processor |
| Series | no data | Pentium D |
| Power efficiency | 4.01 | no data |
| Architecture codename | Westmere-EP (2010−2011) | Smithfield (2005) |
| Release date | 14 February 2011 (13 years ago) | May 2005 (19 years ago) |
| Launch price (MSRP) | $162 | no data |
Cost-effectiveness evaluation
Performance per price, higher is better.
Detailed specifications
Xeon X5675 and Pentium D 820 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 | 6 (Hexa-Core) | 2 (Dual-core) |
| Threads | 12 | 2 |
| Base clock speed | 3.06 GHz | 2.8 GHz |
| Boost clock speed | 3.46 GHz | 2.8 GHz |
| Bus rate | no data | 800 MHz |
| L1 cache | 64 KB (per core) | 28 KB |
| L2 cache | 256 KB (per core) | 2 MB |
| L3 cache | 12288 KB (shared) | 0 KB |
| Chip lithography | 32 nm | 90 nm |
| Die size | 239 mm2 | 206 mm2 |
| Maximum core temperature | 81 °C | 64 °C |
| Number of transistors | 1,170 million | 169 million |
| 64 bit support | + | + |
| Windows 11 compatibility | - | - |
| VID voltage range | no data | 1.2V-1.4V |
Compatibility
Information on Xeon X5675 and Pentium D 820 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 | 2 | 2 |
| Socket | FCLGA1366,LGA1366 | PLGA775 |
| Power consumption (TDP) | 95 Watt | 95 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Xeon X5675 and Pentium D 820. You'll probably need this information if you require some particular technology.
| Instruction set extensions | Intel® SSE4.2 | no data |
| AES-NI | + | - |
| Enhanced SpeedStep (EIST) | + | - |
| Turbo Boost Technology | 1.0 | - |
| Hyper-Threading Technology | + | - |
| Idle States | + | + |
| Demand Based Switching | + | - |
| PAE | 40 Bit | 32 Bit |
| FSB parity | no data | - |
Security technologies
Xeon X5675 and Pentium D 820 technologies aimed at improving security, for example, by protecting against hacks.
| TXT | + | - |
| EDB | + | + |
Virtualization technologies
Virtual machine speed-up technologies supported by Xeon X5675 and Pentium D 820 are enumerated here.
| VT-d | + | - |
| VT-x | + | - |
| EPT | + | no data |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Xeon X5675 and Pentium D 820. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR3 | DDR1, DDR2, DDR3 |
| Maximum memory size | 288 GB | no data |
| Max memory channels | 3 | no data |
| Maximum memory bandwidth | 32 GB/s | no data |
| ECC memory support | + | - |
Peripherals
Specifications and connection of peripherals supported by Xeon X5675 and Pentium D 820.
| PCIe version | 2.0 | no data |
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 | 4.03 | 0.31 |
| Physical cores | 6 | 2 |
| Threads | 12 | 2 |
| Chip lithography | 32 nm | 90 nm |
Xeon X5675 has a 1200% higher aggregate performance score, 200% more physical cores and 500% more threads, and a 181.3% more advanced lithography process.
The Xeon X5675 is our recommended choice as it beats the Pentium D 820 in performance tests.
Be aware that Xeon X5675 is a server/workstation processor while Pentium D 820 is a desktop one.
Should you still have questions on choice between Xeon X5675 and Pentium D 820, ask them in Comments section, and we shall answer.
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.
