Core i7-1255U vs Core 2 Quad Q8400s
Primary details
Comparing Core 2 Quad Q8400s and Core i7-1255U processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | not rated | 895 |
| Place by popularity | not in top-100 | 74 |
| Market segment | Desktop processor | Laptop |
| Series | no data | Intel Alder Lake-M |
| Power efficiency | no data | 53.82 |
| Architecture codename | Yorkfield (2007−2009) | Alder Lake-U (2022) |
| Release date | 19 April 2009 (15 years ago) | 23 February 2022 (2 years ago) |
Detailed specifications
Core 2 Quad Q8400s and Core i7-1255U 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 | 12 |
| Base clock speed | 2.66 GHz | 1.7 GHz |
| Boost clock speed | 0.67 GHz | 4.7 GHz |
| Bus rate | 1333 MHz | no data |
| L1 cache | 64 KB (per core) | 80K (per core) |
| L2 cache | 4 MB (shared) | 1.25 MB (per core) |
| L3 cache | 0 KB | 12 MB (shared) |
| Chip lithography | 45 nm | 10 nm |
| Die size | 2x 82 mm2 | no data |
| Maximum core temperature | no data | 100 °C |
| Maximum case temperature (TCase) | 76 °C | no data |
| Number of transistors | 456 million | no data |
| 64 bit support | + | + |
| Windows 11 compatibility | - | + |
| VID voltage range | 0.85V-1.3625V | no data |
Compatibility
Information on Core 2 Quad Q8400s and Core i7-1255U 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 |
| Socket | FCLGA775,LGA775 | Intel BGA 1744 |
| Power consumption (TDP) | 65 Watt | 15 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Core 2 Quad Q8400s and Core i7-1255U. You'll probably need this information if you require some particular technology.
| AES-NI | - | + |
| FMA | - | + |
| AVX | - | + |
| Enhanced SpeedStep (EIST) | + | + |
| Turbo Boost Technology | - | no data |
| Hyper-Threading Technology | - | no data |
| TSX | - | + |
| Idle States | + | no data |
| Thermal Monitoring | + | - |
| Demand Based Switching | - | no data |
Security technologies
Core 2 Quad Q8400s and Core i7-1255U technologies aimed at improving security, for example, by protecting against hacks.
| TXT | - | + |
| EDB | + | no data |
Virtualization technologies
Virtual machine speed-up technologies supported by Core 2 Quad Q8400s and Core i7-1255U are enumerated here.
| VT-d | no data | + |
| VT-x | + | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Core 2 Quad Q8400s and Core i7-1255U. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR1, DDR2, DDR3 | DDR4, DDR5 |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | On certain motherboards (Chipset feature) | Intel Iris Xe Graphics G7 96EUs ( - 1250 MHz) |
Peripherals
Specifications and connection of peripherals supported by Core 2 Quad Q8400s and Core i7-1255U.
| PCIe version | 2.0 | 4.0 |
| PCI Express lanes | no data | 20 |
Pros & cons summary
| Recency | 19 April 2009 | 23 February 2022 |
| Physical cores | 4 | 10 |
| Threads | 4 | 12 |
| Chip lithography | 45 nm | 10 nm |
| Power consumption (TDP) | 65 Watt | 15 Watt |
i7-1255U has an age advantage of 12 years, 150% more physical cores and 200% more threads, a 350% more advanced lithography process, and 333.3% lower power consumption.
We couldn't decide between Core 2 Quad Q8400s and Core i7-1255U. We've got no test results to judge.
Note that Core 2 Quad Q8400s is a desktop processor while Core i7-1255U is a notebook one.
Should you still have questions on choice between Core 2 Quad Q8400s and Core i7-1255U, 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.
