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Intel Corp.’s Haswell microprocessors due in early June are expected to bring a number of innovations designed to improve performance and cut power consumption, however, in many cases not all users will be able to enjoy all of them. As it appears, end-users will either have disable low-power states of Haswell or get a new power-supply units compatible with the new Intel chip.

As it appears, Haswell's C6/C7 states require a minimum load of 0.05A on the 12V2 rail, and many desktop power supply units (PSUs) just cannot provide that low current, reports The Tech Report web-site. Meanwhile, numerous older PSUs, which comply with ATX12V v2.3 design guidelines only called for a minimum load of 0.5A on the CPU power rail, hence a less sophisticated internal feedback loop/protection could be used, reports VR-Zone web-site. As a result, unless C6/C7 power states are disabled in the BIOS, PCs with older/cheap PSUs may become unstable when processors enter these states.