{"id":41629,"date":"2026-05-27T19:00:00","date_gmt":"2026-05-28T00:00:00","guid":{"rendered":"https:\/\/flex.com\/?post_type=resource&#038;p=41629"},"modified":"2026-05-27T15:27:09","modified_gmt":"2026-05-27T20:27:09","slug":"megawatt-racks-are-coming-how-800-vdc-architectures-reduce-losses-and-remove-constraints","status":"publish","type":"resource","link":"https:\/\/flex.com\/de\/resources\/megawatt-racks-are-coming-how-800-vdc-architectures-reduce-losses-and-remove-constraints","title":{"rendered":"Megawatt-Racks kommen: Wie 800-VDC-Architekturen Verluste reduzieren und Einschr\u00e4nkungen beseitigen"},"content":{"rendered":"<div id=\"overscroll-top\" style=\"background-color: #eaeef4;\"><\/div>\n<div class=\"resource-header block\">\n\t<div class=\"container\">\n\t\t<div class=\"breadcrumb\">\n\t\t\t<a title=\"Homepage\" href=\"\/\">Flex<\/a>\n\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 384 512\"><path d=\"M365.3 256l-22.6 22.6-192 192L128 493.3 82.7 448l22.6-22.6L274.7 256 105.4 86.6 82.7 64 128 18.7l22.6 22.6 192 192L365.3 256z\"\/><\/svg>\n\t\t\t<a title=\"Resources\" href=\"\/resources\">Resources<\/a>\n\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 384 512\"><path d=\"M365.3 256l-22.6 22.6-192 192L128 493.3 82.7 448l22.6-22.6L274.7 256 105.4 86.6 82.7 64 128 18.7l22.6 22.6 192 192L365.3 256z\"\/><\/svg>\n\t\t\t<a title=\"Megawatt racks are coming: How 800 VDC architectures reduce losses and remove constraints\">Megawatt racks are coming: How 800 VDC architectures reduce losses and remove constraints<\/a>\n\t\t<\/div>\n\t\t<h1>Megawatt racks are coming: How 800 VDC architectures reduce losses and remove constraints<\/h1>\n\t\t\t\t<div class=\"separator\"><\/div>\n\t\t<div class=\"details\">\n\t\t\t\t\t\t\t\t\t<div class=\"date detail\">\n\t\t\t\tPosted on<br>\n\t\t\t\tMai 27, 2026\t\t\t<\/div>\n\t\t\t\t\t\t<div class=\"categories\">\n\t\t\t\t<div class=\"categories-wrapper\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"cat-tag\">Blog<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"cat-tag\" data-cat-level=\"3\" data-destination=\"https:\/\/flex.com\/industries\/data-center?subcategories=data-center-power#resources\" href=\"https:\/\/flex.com\/industries\/data-center?subcategories=data-center-power#resources\">Data Center Power<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"cat-tag\" data-cat-level=\"2\" data-destination=\"https:\/\/flex.com\/products\/power-modules#resources\" href=\"https:\/\/flex.com\/products\/power-modules#resources\">Power Modules<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t<\/div>\n<\/div>\n\n\n\n<div class=\"sidebar block normal-sidebar\">\n\t<div class=\"container\">\n\t\t<div class=\"content\">\n\t\t\t\n\n<p>It used to be surprising when data center racks consumed 10 kW of power, but it\u2019s now becoming increasingly discussed in forward\u2011looking AI infrastructure designs to hear about next-gen AI workloads in racks running at 1 MW or more. For the less power-savvy, let\u2019s put those numbers in perspective: 10 kW is enough power to heat a small home in winter, while 1 MW is enough to heat a large commercial facility.<\/p>\n\n\n\n<p>That is a lot of power to put in a 19 or 21 in rack\/cabinet footprint, but a <a href=\"https:\/\/flex.com\/industries\/data-center\" data-type=\"page\" data-id=\"19229\">hyperscale-class data center<\/a> is more than just a single rack. As AI compute draws more power, there is also pressure to increase the utilization factor of data center floor space by packing as many servers as possible into a given footprint. Historically, each rack has included AC\/DC converters that route 48\/54 V outputs to the server shelves from three-phase AC input. High performance systems need power distribution units (PDUs) and battery back-up (BBU) modules as well.<\/p>\n\n\n\n<p>All of this power equipment scales in size with the power draw, becoming a physical constraint to packing more processing power into a rack, and traditional power architectures are approaching practical efficiency and density limits for next\u2011generation AI systems. Total output current is in the tens of thousands of amps at 48 V at the MW level, so if the AC\/DCs were external to the rack, the losses in practical interconnections would be unworkable and connector\/contact heating becomes a new near-impossible constraint.<\/p>\n\n\n\n<p>The industry is increasingly evaluating a new generation of power architectures.<\/p>\n\n\n\t\t<\/div>\n\t\t<div class=\"sidebar normal-column\">\n\t\t\t\t\t\t\t\t\t<div class=\"post\">\n\t\t\t\t\t\t\t\t<a title=\"Quarter-brick DC\/DC converter evolution: Advancing power density and efficiency\" class=\"image\" href=\"https:\/\/flex.com\/de\/resources\/quarter-brick-dc-dc-converter-evolution-advancing-power-density-and-efficiency\" target=\"_self\">\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" alt=\"Quarter-brick DC\/DC converter from Flex Power Modules\" src=\"https:\/\/flex.com\/wp-content\/uploads\/2026\/05\/QB-Evolution-540x304.png\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"label\">\n\t\t\t\t\t\t\tBlog\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t<a title=\"Quarter-brick DC\/DC converter evolution: Advancing power density and efficiency\" class=\"title\" href=\"https:\/\/flex.com\/de\/resources\/quarter-brick-dc-dc-converter-evolution-advancing-power-density-and-efficiency\" target=\"_self\">\n\t\t\t\t\tQuarter-brick DC\/DC converter evolution: Advancing power density and efficiency\t\t\t\t<\/a>\n\t\t\t<\/div>\n\t\t\t\t\t\t<div class=\"post\">\n\t\t\t\t\t\t\t\t<a title=\"Powering data centers from grid to chip\" class=\"image\" href=\"https:\/\/flex.com\/downloads\/powering-data-centers-from-grid-to-chip\" target=\"_self\">\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" alt=\"Powering data centers from grid to chip\" src=\"https:\/\/flex.com\/wp-content\/uploads\/2025\/05\/2026-Power-Brochure-cover-540x304.jpg\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"label\">\n\t\t\t\t\t\t\tBrochure\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t<a title=\"Powering data centers from grid to chip\" class=\"title\" href=\"https:\/\/flex.com\/downloads\/powering-data-centers-from-grid-to-chip\" target=\"_self\">\n\t\t\t\t\tPowering data centers from grid to chip\t\t\t\t<\/a>\n\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t<\/div>\n<\/div>\n\n<div id=\"id-6a1847fe24af9\" class=\"box block full-width dark-content de \" style=\"background-color: transparent; background-image: none;\">\n\t<style>\n\t\t#id-6a1847fe24af9 > .container > .content {\n\t\t\tbackground-color: transparent;\n\t\t\tposition: relative;\n\t\t\tpadding-top: 48px;\n\t\t\tpadding-right: 0px;\n\t\t\tpadding-bottom: 84px;\n\t\t\tpadding-left: 0px;\n\t\t\tmargin-left: 0px;\n\t\t\tmargin-right: 0px;\n\t\t}\n\t\t@media (max-width: 1272px) {\n\t\t\t#id-6a1847fe24af9.box.block.full-width > .container > .content {\n\t\t\t\tpadding-left: 0 !important;\n\t\t\t\tpadding-right: 0 !important;\n\t\t\t\tmargin: 0 !important;\n\t\t\t}\n\t\t}\n\t\t@media (max-width: 960px) {\n\t\t\t#id-6a1847fe24af9 > .container > .content {\n\t\t\t\t\/\/padding-top: 24px;\n\t\t\t\tpadding-right: 0px;\n\t\t\t\t\/\/padding-bottom: 42px;\n\t\t\t\tpadding-left: 0px;\n\t\t\t}\n\t\t}\n\t<\/style>\n\t<div class=\"container\">\n\t\t<div class=\"content\">\n\t\t\t\n\n<h2 class=\"wp-block-heading has-medium-font-size\" style=\"font-style:normal;font-weight:600\">Measuring voltages by the hundreds<\/h2>\n\n\n\n<p><a href=\"https:\/\/flex.com\/products\/power-modules\/800-vdc-modules\" data-type=\"page\" data-id=\"38429\">800 VDC power<\/a> is the clear next step, but there are two different paths towards that goal. The first is the approach proposed by NVIDIA, with power transmission cables consisting of three wires: +800 V, neutral, and ground. The second is the Open Compute Project\u2019s Mount Diablo specification, with power transmission cables that add an extra wire: +400 V, -400V, neutral, and ground. Both of these approaches achieve the same 800 V range, but Mount Diablo effectively operates at half the absolute system voltage.<\/p>\n\n\n\n<p>However, the differences between the two approaches are nowhere near as interesting as what both of them allow when compared to today\u2019s 48 V power architecture. For the same load and conductor sizes, the higher system voltage means current reduces by a factor of around 17 and ohmic losses reduce by a factor of 17<sup>2<\/sup> (289) compared with 48 V systems. That allows for what was previously unthinkable: <strong>the AC\/DC stage, PDU, and batteries can be moved out to a dedicated \u2018sidecar\u2019 rack<\/strong>.<\/p>\n\n\n\n<p>The <a href=\"https:\/\/flex.com\/resources\/press-kit-advancing-ai-factories-with-new-reference-designs-and-800-vdc-power-rack\" data-type=\"resource\" data-id=\"38622\">power sidecar racks<\/a> can now be optimized in their mechanical arrangement for lowest conversion and internal distribution loss, and effective cooling. At the same time, the IT compute rack now has space for additional processor shelves, larger power connections, and advanced liquid cooling arrangements. Improving both power and compute density addresses a long\u2011standing tradeoff between power delivery and compute density, but 800 VDC architectures deliver exactly that \u2014 just make sure that your infrastructure can handle it.<\/p>\n\n\n<div id=\"id_6a1847fe11c14\" class=\"media block\">\n\t<div class=\"container media-right content-bottom\">\n\t\t<div class=\"media\" style=\"left: 0px; min-width: 480px; max-width: 480px;\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"image none\">\n\t\t\t\t\t\t\t<img decoding=\"async\" alt=\"Megawatt racks in a data center server room supporting 800 VDC architectures for reduced loss\" src=\"https:\/\/flex.com\/wp-content\/uploads\/2026\/04\/Server-room-Data-Center--1200x673.jpg\">\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"content\" style=\"margin-right: 36px; margin-left: 0px;\">\n\t\t\t\t\n\n<h2 class=\"wp-block-heading has-medium-font-size\" style=\"font-style:normal;font-weight:600\">Considerations: outside of the rack<\/h2>\n\n\n\n<p>With IT compute racks now receiving 800 VDC there are safety concerns for the interconnections, like those for three-phase AC distribution at 416\/480 VAC. This is one area where the differences between the two 800 VDC standards stand a little bit clearer.<\/p>\n\n\n\n<p>For NVIDIA\u2019s unipolar 800 VDC approach, one side of the supply would be grounded, but the \u2018hot\u2019 side will need substantial insulation and creepage and clearance distances to ground and other conductors \u2014 more than with an AC supply.<\/p>\n\n\n\t\t\t<\/div>\n\t\t\t<\/div>\n\t\n\t<script>\n\t(function () {\n\t\tlet hasRun_id_6a1847fe11c14 = false;\n\t\tfunction updateVideoDisplay_id_6a1847fe11c14() {\n\t\t\tconst youtubeVideoId = \"\";\n\t\t\tconst bynderID = \"\";\n\t\t\tconst mediaType = \"image\";\n\t\t\tconst mediaVideoElement = document.getElementById('media-video-id_6a1847fe11c14');\n\t\t\tconst bodyClass = document.body.className || '';\n\t\t\tconst match = bodyClass.match(\/translatepress-([a-z]{2})(?:_[A-Z]{2})?\/i);\n\t\t\tconst currentLanguage = match ? match[1].toLowerCase() : 'en';\n\t\t\tconst isChineseLang = currentLanguage === 'zh';\n\t\t\tconsole.log('isChineseLang:', isChineseLang);\n\t\t\tconsole.log('Language detected:', currentLanguage);\n\t\t\tconst isValidYouTube = youtubeVideoId && \/^[A-Za-z0-9_-]{11}$\/.test(youtubeVideoId);\n\t\t\t\n\t\t\tif (!mediaVideoElement || mediaType !== \"video\") return;\n\t\t\tmediaVideoElement.innerHTML = ''; 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You can use a high-resistance, mid-point-earthed (IT) scheme so each pole sits at about half the pole-to-pole voltage relative to earth. ETSI notes this reduces the voltage-to-earth to 50%, but it also means both conductors are live to earth and must be insulated. The same symmetry can improve EMC and make common-mode EMI filtering (common-mode chokes) easier. Because the bonding\/return topology sets the common impedance in the ground network, ETSI\u2019s guidance highlights that this is the path where DC power supply currents can circulate when systems are interconnected, so the earthing\/bonding scheme strongly affects common-mode behavior. In ETSI\u2019s preferred arrangement, the mid-point terminal is connected to the Main Earthing Terminal (MET), which ETSI describes as the common earthing point for the mid-point and protective earthing conductor (a defined reference point rather than ad-hoc local chassis earthing).<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-medium-font-size\" style=\"font-style:normal;font-weight:600\">Considerations: inside the rack<\/h2>\n\n\n\n<p>800 VDC is routed to each shelf inside the server rack, and insulation is a major consideration as the requirements are far more onerous than with 48 V. This affects connector\/cable ratings and creepage and clearance distances on PCBs and around busbars, requiring changes throughout the rack. One effect is that down-conversion DC\/DC stages must be isolated to appropriate safety agency standards, such as IEC\/UL 62368-1 system evaluation, depending on architecture. This goes against recent trends to eliminate isolation at this point and means that the entire server rack would need to be evaluated by a safety agency now.<\/p>\n\n\n\n<p>Another effect is that the down-conversion DC\/DCs typically have generated an output intermediate bus of 12 V from a 48 V input, regulated or unregulated. However, they must now operate from the increased DC voltage input or utilize series-stacked input stages so that the highest-possible efficiency switching devices can be used. Converters with these specifications are not common for data centers yet, but it may be possible to leverage similar products from electric vehicles in the short-term.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-medium-font-size\" style=\"font-style:normal;font-weight:600\">Considerations: everywhere in between<\/h2>\n\n\n\n<p>Another key consideration within the rack is that elimination of the 48 V bus removes the natural point to connect traditional 48 V backup batteries, necessitating new approaches to power storage. For lithium-ion systems, moving to a higher-voltage bus is mainly a matter of updating pack architecture, using more modules in series to reach the required DC link voltage. If a system requires short-duration ride-through or very frequent cycling, capacitor-based energy storage such as supercapacitor banks can be a good fit. They are typically low maintenance, tolerant of wide temperatures, and capable of very high cycle life \u2014 although they offer shorter hold-up time because they store less energy.<\/p>\n\n\n\n<p>No matter how you choose to store power, 800 VDC also makes it simpler to incorporate onsite power generation. The 800 V bus allows more direct alignment with various microgrid or renewable DC bus architectures, which typically operate in a similar voltage range, making the interface simpler.<\/p>\n\n\n\t\t<\/div>\n\t<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Discover how 800 VDC architecture powers megawatt racks, minimizes inefficiencies, and removes scaling constraints.<\/p>","protected":false},"author":3,"featured_media":41911,"template":"","categories":[90,97],"tags":[],"content-type":[13],"class_list":["post-41629","resource","type-resource","status-publish","has-post-thumbnail","hentry","category-data-center-power","category-power-modules","content-type-blog"],"acf":[],"_links":{"self":[{"href":"https:\/\/flex.com\/de\/wp-json\/wp\/v2\/resource\/41629","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/flex.com\/de\/wp-json\/wp\/v2\/resource"}],"about":[{"href":"https:\/\/flex.com\/de\/wp-json\/wp\/v2\/types\/resource"}],"author":[{"embeddable":true,"href":"https:\/\/flex.com\/de\/wp-json\/wp\/v2\/users\/3"}],"version-history":[{"count":5,"href":"https:\/\/flex.com\/de\/wp-json\/wp\/v2\/resource\/41629\/revisions"}],"predecessor-version":[{"id":42132,"href":"https:\/\/flex.com\/de\/wp-json\/wp\/v2\/resource\/41629\/revisions\/42132"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/flex.com\/de\/wp-json\/wp\/v2\/media\/41911"}],"wp:attachment":[{"href":"https:\/\/flex.com\/de\/wp-json\/wp\/v2\/media?parent=41629"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/flex.com\/de\/wp-json\/wp\/v2\/categories?post=41629"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/flex.com\/de\/wp-json\/wp\/v2\/tags?post=41629"},{"taxonomy":"content-type","embeddable":true,"href":"https:\/\/flex.com\/de\/wp-json\/wp\/v2\/content-type?post=41629"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}