Intel Haswell: possible incompatibilities with some power supplies

Tuesday, April 30, 20130 comments

The new stadiums C6 and C7, introduced with Haswell CPU to minimize the idle power consumption, could introduce an incompatibility with ATX power supplies that do not reflect the new power specifications

With each new generation of Intel Core series processor looks for a continuous containment of consumption, both at full load as in Idle. This trend will be carried out with solutions Haswell, code name that identifies the next generation of microarchitecture expected to debut next month of June, with the first models.
VR-Zone report, a possible problem of compatibility between the platforms for Haswell processors and some ATX power supplies to these combined, linked to the minimum current that must be supplied to the processor when it enters into one of the phases of most high fuel economy.
In correspondence with the power state C6 and C7, the two by using less power in which the CPU can be placed Haswell, the specifications state a minimum current of 0.05 amperes, must be supplied from. For the previous generation of Intel Core processors based on Ivy Bridge architecture, the same specifications required a current of 0.5 amperes.
It is assumed that power is not appropriately developed may have problems to provide this type of current, thereby bringing the system to malfunction when the processor enters one of the states C6 or C7 to the lowest consumption. The manufacturers of power usage is usually specified in the technical specifications of the operation of any product data maximum and not the minimum load: for this reason it is not clear when such models may or may not give malfunctions with these platforms in the lowest power mode.
An alternative way to overcome this potential incompatibility problem may be to disable the activation of these two stages of operation in the lowest consumption. Such an approach would be possible for those with bios LGA 1150 socket motherboards that will implement this feature, but there are no specific details about it at the time. An approach of this kind would lead to a slight increase in idle power consumption for these processors, estimated at a few watts, but with the advantage of ensuring proper operation with power supplies that do not test these new specifications.
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