Celeron 3865U vs Core 2 Duo E8400
Aggregate performance score
Celeron 3865U outperforms Core 2 Duo E8400 by a moderate 15% based on our aggregate benchmark results.
Primary details
Comparing Core 2 Duo E8400 and Celeron 3865U processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 2686 | 2590 |
| Place by popularity | not in top-100 | not in top-100 |
| Market segment | Desktop processor | Laptop |
| Series | no data | Intel Celeron |
| Power efficiency | 1.06 | 5.30 |
| Architecture codename | Wolfdale (2008−2010) | Kaby Lake-U (2017) |
| Release date | 1 January 2008 (16 years ago) | 3 January 2017 (7 years ago) |
| Launch price (MSRP) | no data | $107 |
Detailed specifications
Core 2 Duo E8400 and Celeron 3865U 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 | 2 (Dual-core) | 2 (Dual-core) |
| Threads | 2 | 2 |
| Base clock speed | 3 GHz | 1.8 GHz |
| Boost clock speed | 3 GHz | 1.8 GHz |
| Bus type | no data | OPI |
| Bus rate | 1333 MHz | 4 GT/s |
| Multiplier | no data | 22 |
| L1 cache | 64 KB (per core) | 64K (per core) |
| L2 cache | 6 MB (shared) | 256K (per core) |
| L3 cache | 0 KB | 2 MB (shared) |
| Chip lithography | 45 nm | 14 nm |
| Die size | 104 mm2 | 98.7 mm2 |
| Maximum core temperature | no data | 100 °C |
| Maximum case temperature (TCase) | 72 °C | no data |
| Number of transistors | 410 million | no data |
| 64 bit support | + | + |
| Windows 11 compatibility | - | - |
| VID voltage range | 0.85V-1.3625V | no data |
Compatibility
Information on Core 2 Duo E8400 and Celeron 3865U 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 (Uniprocessor) |
| Socket | LGA775 | FCBGA1356,FPBGA1356 |
| Power consumption (TDP) | 65 Watt | 15 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Core 2 Duo E8400 and Celeron 3865U. You'll probably need this information if you require some particular technology.
| Instruction set extensions | no data | Intel® SSE4.1, Intel® SSE4.2 |
| AES-NI | - | + |
| AVX | - | + |
| vPro | no data | + |
| Enhanced SpeedStep (EIST) | + | + |
| Speed Shift | no data | + |
| My WiFi | no data | + |
| Turbo Boost Technology | - | - |
| Hyper-Threading Technology | - | + |
| Idle States | + | + |
| Thermal Monitoring | + | + |
| Flex Memory Access | no data | + |
| Smart Response | no data | + |
| Demand Based Switching | - | no data |
| FSB parity | - | no data |
Security technologies
Core 2 Duo E8400 and Celeron 3865U technologies aimed at improving security, for example, by protecting against hacks.
| TXT | + | - |
| EDB | + | + |
| Secure Key | no data | + |
| MPX | - | + |
| SGX | no data | Yes with Intel® ME |
| OS Guard | no data | + |
Virtualization technologies
Virtual machine speed-up technologies supported by Core 2 Duo E8400 and Celeron 3865U are enumerated here.
| AMD-V | - | + |
| VT-d | + | + |
| VT-x | + | + |
| EPT | no data | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Core 2 Duo E8400 and Celeron 3865U. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR1, DDR2, DDR3 | DDR3, DDR4 |
| Maximum memory size | no data | 32 GB |
| Max memory channels | no data | 2 |
| Maximum memory bandwidth | no data | 34.134 GB/s |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | On certain motherboards (Chipset feature) | Intel HD Graphics 610 |
| Max video memory | no data | 32 GB |
| Quick Sync Video | - | + |
| Clear Video | no data | + |
| Clear Video HD | no data | + |
| Graphics max frequency | no data | 900 MHz |
Graphics interfaces
Available interfaces and connections of Core 2 Duo E8400 and Celeron 3865U integrated GPUs.
| Number of displays supported | no data | 3 |
| eDP | no data | + |
| DisplayPort | - | + |
| HDMI | - | + |
| DVI | no data | + |
Graphics image quality
Maximum display resolutions supported by Core 2 Duo E8400 and Celeron 3865U integrated GPUs, including resolutions over different interfaces.
| 4K resolution support | no data | + |
| Max resolution over HDMI 1.4 | no data | 4096x2304@24Hz |
| Max resolution over eDP | no data | 4096x2304@60Hz |
| Max resolution over DisplayPort | no data | 4096x2304@60Hz |
Graphics API support
APIs supported by Core 2 Duo E8400 and Celeron 3865U integrated GPUs, sometimes API versions are included.
| DirectX | no data | 12 |
| OpenGL | no data | 4.4 |
Peripherals
Specifications and connection of peripherals supported by Core 2 Duo E8400 and Celeron 3865U.
| PCIe version | 2.0 | 2.0 |
| PCI Express lanes | no data | 10 |
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.
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.
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.
Pros & cons summary
| Performance score | 0.73 | 0.84 |
| Recency | 1 January 2008 | 3 January 2017 |
| Chip lithography | 45 nm | 14 nm |
| Power consumption (TDP) | 65 Watt | 15 Watt |
Celeron 3865U has a 15.1% higher aggregate performance score, an age advantage of 9 years, a 221.4% more advanced lithography process, and 333.3% lower power consumption.
The Celeron 3865U is our recommended choice as it beats the Core 2 Duo E8400 in performance tests.
Note that Core 2 Duo E8400 is a desktop processor while Celeron 3865U is a notebook one.
Should you still have questions on choice between Core 2 Duo E8400 and Celeron 3865U, ask them in Comments section, and we shall answer.
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