Core 2 Duo P8400 vs Celeron 3855U
Aggregate performance score
Celeron 3855U outperforms Core 2 Duo P8400 by a considerable 44% based on our aggregate benchmark results.
Primary details
Comparing Celeron 3855U and Core 2 Duo P8400 processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 2634 | 2841 |
| Place by popularity | not in top-100 | not in top-100 |
| Market segment | Laptop | Laptop |
| Series | Intel Celeron | Intel Core 2 Duo |
| Power efficiency | 4.83 | 2.01 |
| Architecture codename | Skylake (2015−2016) | Penryn (2008−2011) |
| Release date | 15 August 2015 (9 years ago) | 15 July 2008 (16 years ago) |
| Launch price (MSRP) | $107 | $209 |
Detailed specifications
Celeron 3855U and Core 2 Duo P8400 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 | 1.6 GHz | 2.26 GHz |
| Boost clock speed | 1.6 GHz | 2.26 GHz |
| Bus type | OPI | no data |
| Bus rate | 4 GT/s | 1066 MHz |
| Multiplier | 16 | no data |
| L1 cache | 128 KB | 128 KB |
| L2 cache | 512 KB | 3 MB |
| L3 cache | 2 MB | 3 MB L2 Cache |
| Chip lithography | 14 nm | 45 nm |
| Die size | 98.57 mm2 | 107 mm2 |
| Maximum core temperature | 100 °C | 105 °C |
| Number of transistors | 1750 Million | 410 Million |
| 64 bit support | + | + |
| Windows 11 compatibility | - | - |
| VID voltage range | no data | 1.05V-1.15V |
Compatibility
Information on Celeron 3855U and Core 2 Duo P8400 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 (Uniprocessor) | no data |
| Socket | FCBGA1356 | BGA479,PBGA479,PGA478 |
| Power consumption (TDP) | 15 Watt | 25 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Celeron 3855U and Core 2 Duo P8400. You'll probably need this information if you require some particular technology.
| Instruction set extensions | Intel® SSE4.1, Intel® SSE4.2 | no data |
| AES-NI | + | - |
| Enhanced SpeedStep (EIST) | + | + |
| 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
Celeron 3855U and Core 2 Duo P8400 technologies aimed at improving security, for example, by protecting against hacks.
| TXT | - | + |
| EDB | + | + |
| Secure Key | + | no data |
| Identity Protection | + | - |
| SGX | Yes with Intel® ME | no data |
| OS Guard | - | no data |
Virtualization technologies
Virtual machine speed-up technologies supported by Celeron 3855U and Core 2 Duo P8400 are enumerated here.
| VT-d | + | no data |
| VT-x | + | + |
| EPT | + | no data |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Celeron 3855U and Core 2 Duo P8400. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR4-1866/2133, LPDDR3-1600/1866, DDR3L-1333/1600 | no data |
| Maximum memory size | 32 GB | no data |
| Max memory channels | 2 | no data |
| Maximum memory bandwidth | 34.134 GB/s | no data |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | Intel HD Graphics 510 | no data |
| Max video memory | 32 GB | no data |
| Quick Sync Video | + | - |
| Clear Video HD | + | no data |
| Graphics max frequency | 900 MHz | no data |
Graphics interfaces
Available interfaces and connections of Celeron 3855U and Core 2 Duo P8400 integrated GPUs.
| Number of displays supported | 3 | no data |
| eDP | + | no data |
| DisplayPort | + | - |
| HDMI | + | - |
| DVI | + | no data |
Graphics image quality
Maximum display resolutions supported by Celeron 3855U and Core 2 Duo P8400 integrated GPUs, including resolutions over different interfaces.
| 4K resolution support | + | no data |
| Max resolution over HDMI 1.4 | 4096x2304@24Hz | no data |
| Max resolution over eDP | 4096x2304@60Hz | no data |
| Max resolution over DisplayPort | 4096x2304@60Hz | no data |
| Max resolution over VGA | N/A | no data |
Graphics API support
APIs supported by Celeron 3855U and Core 2 Duo P8400 integrated GPUs, sometimes API versions are included.
| DirectX | 12 | no data |
| OpenGL | 4.4 | no data |
Peripherals
Specifications and connection of peripherals supported by Celeron 3855U and Core 2 Duo P8400.
| PCIe version | 2.0 | no data |
| PCI Express lanes | 10 | 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.
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 | 0.78 | 0.54 |
| Recency | 15 August 2015 | 15 July 2008 |
| Chip lithography | 14 nm | 45 nm |
| Power consumption (TDP) | 15 Watt | 25 Watt |
Celeron 3855U has a 44.4% higher aggregate performance score, an age advantage of 7 years, a 221.4% more advanced lithography process, and 66.7% lower power consumption.
The Celeron 3855U is our recommended choice as it beats the Core 2 Duo P8400 in performance tests.
Should you still have questions on choice between Celeron 3855U and Core 2 Duo P8400, ask them in Comments section, and we shall answer.
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