{"id":2039,"date":"2013-05-05T12:13:40","date_gmt":"2013-05-05T16:13:40","guid":{"rendered":"http:\/\/blog.nccomputertech.com\/?p=2039"},"modified":"2013-05-05T12:13:40","modified_gmt":"2013-05-05T16:13:40","slug":"most-power-supplies-wont-support-haswells-c6c7-low-power-states","status":"publish","type":"post","link":"https:\/\/nccomputertech.com\/techtalk\/2013\/05\/05\/most-power-supplies-wont-support-haswells-c6c7-low-power-states\/","title":{"rendered":"Most power supplies won't support Haswell's C6\/C7 low-power states"},"content":{"rendered":"

\"\"<\/a><\/p>\n

Intel\u2019s Haswell processor is just around the corner and if you are planning to pick up some new silicon, you\u2019ll likely want to keep reading. That\u2019s because it has been discovered that a number of power supplies currently on the market don\u2019t support Haswell\u2019s C6\/C7 low-power states due to the fact they are unable to deliver less than 0.05 amps across the 12V2 rail according to a report from VR-Zone.
\nAccording to an Intel document viewed by the gang at The Tech Report, Haswell\u2019s C6\/C7 states requires a minimum load of 0.05 amps on the 12V2 line. Power supplies that are older or budget models simply aren\u2019t capable of delivering such a small amount of juice. As a result, users with incompatible power supplies may experience stability problems or worse, the system may shut down completely if the PSU\u2019s under- or over-voltage protection kicks in.
\nThe problem will be difficult to diagnose as most power supply makers don\u2019t advertise a unit\u2019s 12V2 rail specifications. Intel\u2019s Reseller Center website does have a list of power supplies that can be sorted by minimum 12V2 load. At present only 23 power supplies appear to be compatible with these new C6\/C7 states: 19 from Corsair, three from InWin and one from Seasonic.
\nCorsair\u2019s Robert Pearce said he expects most motherboard vendors to disable C6\/C7 by default in the BIOS as there are simply too many power supplies on the market that don\u2019t support the power-saving feature. He further noted that Corsair is working to ensure all of their power supplies are C6\/C7 compliant.
\nvia Most power supplies won’t support Haswell’s C6\/C7 low-power states – TechSpot<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

Intel\u2019s Haswell processor is just around the corner and if you are planning to pick up some new silicon, you\u2019ll […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[3,10],"tags":[161,464,529,635,844],"class_list":["post-2039","post","type-post","status-publish","format-standard","hentry","category-hardware","category-technology","tag-c6c7","tag-haswell","tag-intel","tag-low-power-states","tag-power-supplies"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/papNkV-wT","jetpack-related-posts":[{"id":3006,"url":"https:\/\/nccomputertech.com\/techtalk\/2013\/07\/24\/long-life-no-cooling-fans-intels-4-5w-core-processors-could-blur-the-pctablet-line\/","url_meta":{"origin":2039,"position":0},"title":"Long life, no cooling fans: Intel's 4.5W Core processors could blur the PC\/tablet line","author":"NCCT","date":"July 24, 2013","format":false,"excerpt":"Windows tablets hold within them an implicit promise: To deliver the full Windows 8 experience in a svelte tablet form factor. 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