Intel Core i5-4278U
The Intel Core i5-4278U is a LV (low voltage) dual-core processor for large ultrabooks launched in Q3 2014. It is based on the Haswell architecture and is manufactured in 22nm. Due to Hyper-Threading, the two cores can handle up to four threads in parallel, leading to better utilization of the CPU. Each core offers a base speed of 2.6 GHz, but can dynamically increase clock rates with Turbo Boost up to 3.1 GHz.
Haswell is the successor to the Ivy Bridge architecture with improvements on both GPU and CPU performance. The CPUs are produced in 22nm and offer an optimized branch prediction as well as additional execution ports, improving the performance per clock by almost 10 percent. Furthermore, new features like AVX2 and FMA should increase the performance in future applications.
Due to these architectural improvements, the performance is slightly above a similarly clocked Ivy Bridge CPU. Therefore, the Core i5-4278U is almost as fast as the older i7-3520M. However, when using new instruction sets such as AVX2 the performance can be significantly better. Thus, the CPU has sufficient power for office and multimedia purposes as well as more demanding applications.
The integrated Iris Graphics 5100 offers 40 Execution Units (EUs) clocked at 200 - 1100 MHz with Turbo Boost, making it significantly faster than the HD Graphics 4000. As a result, the Iris Graphics competes with dedicated lower mid-range graphics cards (e.g. GeForce GT 720M). However, even fast dual-channel memory limits the performance.
The i5-4278U is rated at a TDP of 28 W including the graphics card, memory controller, VRMs and the integrated chipset. Therefore, the CPU is suited for larger, well-cooled ultrabooks.
|Series||Intel Core i5|
|Series: Core i5 Haswell|
|Clock Rate||2600 - 3100 MHz|
|Level 1 Cache||128 KB|
|Level 2 Cache||512 KB|
|Level 3 Cache||3 MB|
|Number of Cores / Threads||2 / 4|
|Power Consumption (TDP = Thermal Design Power)||28 Watt|
|Transistor Count||1300 Million|
|Manufacturing Technology||22 nm|
|Die Size||181 mm2|
|Max. Temperature||100 °C|
|Features||Iris Graphics 5100 (200 - 1100 MHz), DDR3(L)-1600 Memory Controller, HyperThreading, AVX, AVX2, Quick Sync, Virtualization, AES-NI|
|GPU||Intel Iris Graphics 5100 (200 - 1100 MHz)|
|64 Bit||64 Bit support|
|Starting Price||$315 U.S.|
|Product Link (external)||Intel Core i5 4278U|
- Average benchmark values for this graphics card
* Smaller numbers mean a higher performance
Reviews for the Intel Core i5 4278U processor
Apple MacBook Pro Retina 13 inch 2014-07 (Intel Iris Graphics 5100, 13.30")
» Apple MacBook Pro Retina 13 inch 2014-07 - External Review