{"id":6739,"date":"2023-12-04T08:05:56","date_gmt":"2023-12-04T08:05:56","guid":{"rendered":"https:\/\/www.fibermall.com\/blog\/?p=6739"},"modified":"2025-01-09T03:33:18","modified_gmt":"2025-01-09T03:33:18","slug":"the-qsfp-dd-400g-sr4-a-new-choice-for-high-performance-networking","status":"publish","type":"post","link":"https:\/\/www.fibermall.com\/blog\/qsfp-dd-400g-sr4-choice-for-hpc.htm","title":{"rendered":"How to Connect 400G QSFP-DD Switch with ConnectX-7 OSFP NIC"},"content":{"rendered":"\n<p>When building a high-performance AI cluster, selecting the appropriate optical module is crucial for ensuring the speed and stability of network communications. With the continuous advancement of NVIDIA GPU cards, the computing power of single-card GPUs has seen significant improvements. As AI models grow in size, the demands for network bandwidth and transmission efficiency also increase. The 400G network has become the new standard. A 400G network needs to support higher data transfer rates while maintaining low latency and high reliability. In AI and big data applications, the speed and efficiency of data transfer directly affect the completion time of computing tasks. Therefore, a 400G network solution must be able to handle large data streams and minimize transmission delays while ensuring data integrity. RDMA over Converged Ethernet (RoCE) technology has emerged, providing an efficient solution for 400G networks. The QSFP-DD 400G SR4 optical module, as a new choice for high-performance networking, offers an efficient and economical solution for AI clusters.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<div class=\"ast-oembed-container \" style=\"height: 100%;\"><iframe title=\"How to Connect 400G QSFP-DD Switch with ConnectX-7 OSFP NIC | FiberMall\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/nAPWIlfugmA?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<\/div><\/figure>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_76 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.fibermall.com\/blog\/qsfp-dd-400g-sr4-choice-for-hpc.htm\/#400G_Network_Application_Solutions\" >400G Network Application Solutions<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.fibermall.com\/blog\/qsfp-dd-400g-sr4-choice-for-hpc.htm\/#QSFP-DD_400G_SR8\" >QSFP-DD 400G SR8<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.fibermall.com\/blog\/qsfp-dd-400g-sr4-choice-for-hpc.htm\/#OSFP_400G_DR4\" >OSFP 400G DR4<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.fibermall.com\/blog\/qsfp-dd-400g-sr4-choice-for-hpc.htm\/#QSFP-DD_400G_SR4\" >QSFP-DD 400G SR4<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.fibermall.com\/blog\/qsfp-dd-400g-sr4-choice-for-hpc.htm\/#Technical_Advantages\" >Technical Advantages<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.fibermall.com\/blog\/qsfp-dd-400g-sr4-choice-for-hpc.htm\/#Related_Posts\" >Related Posts<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\" id=\"h-400g-network-application-solutions\"><span class=\"ez-toc-section\" id=\"400G_Network_Application_Solutions\"><\/span><strong>400G Network Application Solutions <\/strong><strong><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>When choosing a high-performance network solution for AI clusters, there are mainly two options: InfiniBand networks and Ethernet-based RoCE networks. In a 400G network environment, we usually select the NVIDIA CX7 400G network card to pair with the H800 GPU server. Regarding switches, there are various 400G and 800G switches on the market based on different chips. It is worth noting that mainstream 400G switches on the market mostly use 56G Serdes, while the CX7 network card adopts 112G Serdes.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img decoding=\"async\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/12\/400G-link-2-1024x353.png\" alt=\"400G switch to 400G NIC\" class=\"wp-image-6761\" style=\"width:800px\" width=\"800\" srcset=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/12\/400G-link-2-1024x353.png 1024w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/12\/400G-link-2-300x103.png 300w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/12\/400G-link-2-768x265.png 768w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/12\/400G-link-2-1536x529.png 1536w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/12\/400G-link-2-2048x706.png 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p><a href=\"https:\/\/www.fibermall.com\/sale-452811-qsfp-dd-400g-sr8-850nm-100m.htm\" target=\"_blank\" rel=\"noreferrer noopener\">QSFP-DD 400G SR8<\/a>, OSFP 400G DR4, and QSFP-DD 400G SR4 are three common choices, each with distinct features and application scenarios.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-qsfp-dd-400g-sr8\"><span class=\"ez-toc-section\" id=\"QSFP-DD_400G_SR8\"><\/span><strong>QSFP-DD 400G SR8<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>SR8 indicates the use of multimode fiber to transmit over a distance of 100 meters, with \u201c8\u201d&nbsp;denoting 8 optical channels.<\/li>\n\n\n\n<li>Each channel operates at a rate of 50G PAM4, requiring 16 fibers (8 for sending and 8 for receiving).<\/li>\n\n\n\n<li>SR8 modules use MPO-16 or MPO-24 connectors to connect 8 pairs of fibers.<\/li>\n\n\n\n<li>Suitable for short-distance connections within data centers or between adjacent buildings.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-osfp-400g-dr4\"><span class=\"ez-toc-section\" id=\"OSFP_400G_DR4\"><\/span><strong>OSFP 400G DR4<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>DR4 indicates the use of single-mode fiber to transmit over a distance of 500 meters, with \u201c4\u201d&nbsp;denoting 4 optical channels.<\/li>\n\n\n\n<li>Each channel operates at a rate of 100G PAM4, requiring 8 fibers (4 for sending and 4 for receiving).<\/li>\n\n\n\n<li>DR4 modules use single-mode fiber connectors, such as LC or MPO-12.<\/li>\n\n\n\n<li>Suitable for connections between data centers or for long-distance internal connections.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/12\/DR4-1.png\" alt=\"dr4\" class=\"wp-image-6762\" style=\"width:800px\" width=\"800\" srcset=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/12\/DR4-1.png 988w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/12\/DR4-1-300x118.png 300w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/12\/DR4-1-768x303.png 768w\" sizes=\"(max-width: 988px) 100vw, 988px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-qsfp-dd-400g-sr4\"><span class=\"ez-toc-section\" id=\"QSFP-DD_400G_SR4\"><\/span><strong>QSFP-DD 400G SR4<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>SR4 indicates the use of multimode fiber to transmit over a distance of 100 meters, with \u201c4\u201d&nbsp;denoting 4 optical channels.<\/li>\n\n\n\n<li>Each channel operates at a rate of 100G PAM4, requiring 8 fibers (4 for sending and 4 for receiving).<\/li>\n\n\n\n<li>SR4 modules use MPO-12 connectors to connect 4 pairs of fibers.<\/li>\n\n\n\n<li>Suitable for short-distance connections within data centers or between adjacent buildings.<\/li>\n<\/ul>\n\n\n\n<p>When selecting these optical modules, considerations include transmission distance, fiber type (multimode or single-mode), connector type, and network bandwidth requirements. QSFP-DD SR8 and SR4 modules are typically used for short-distance multimode fiber connections, while OSFP DR4 modules are used for longer-distance single-mode fiber connections. Therefore, for switch-to-switch interconnects, the QSFP-DD 400G SR8 module is the preferred choice. For connections from switches to network cards, customers often choose <a href=\"https:\/\/www.fibermall.com\/sale-452821-400g-qsfp-dd-dr4-1310nm-500m-pam4.htm\" target=\"_blank\" rel=\"noreferrer noopener\">QSFP-DD 400G DR4<\/a> optical modules and use OSFP 400G DR4 modules on the server side to achieve Serdes matching.<\/p>\n\n\n\n<p>However, there is now a more cost-effective option available: the 400G QSFP-DD SR4 module.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/12\/qdd-400g-sr4.png\" alt=\"qdd 400g sr4\" class=\"wp-image-6748\" style=\"width:700px\" width=\"700\" srcset=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/12\/qdd-400g-sr4.png 1000w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/12\/qdd-400g-sr4-300x164.png 300w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/12\/qdd-400g-sr4-768x420.png 768w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n\n\n\n<p>The <a href=\"https:\/\/www.fibermall.com\/sale-460625-qsfp-dd-400g-sr4-850nm-100m.htm\" target=\"_blank\" rel=\"noreferrer noopener\">QSFP-DD 400G SR4<\/a> optical module is a high-density, high-speed optoelectronic component, designed to meet the demands of data centers and high-performance computing networks. It utilizes the QSFP-DD (Quad Small Form Factor Pluggable-Double Density) interface, offering higher port density and bandwidth capabilities. The 400G SR4 module supports a data transfer rate of 400Gbps, operates at a wavelength of 850nm, and uses MPO\/MTP-12 multimode optical fibers, allowing for transmission distances of up to 100 meters. This makes it highly suitable for short-distance connections within data centers or between adjacent buildings.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-technical-advantages\"><span class=\"ez-toc-section\" id=\"Technical_Advantages\"><\/span><strong>Technical Advantages <\/strong><strong><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The technical advantages of the QSFP-DD 400G SR4 module are primarily reflected in the following aspects:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>High-Speed Transmission: The 400Gbps transmission rate significantly enhances the network\u2019s data processing capacity, meeting the high-speed network requirements of AI and big data applications.<\/li>\n\n\n\n<li>Low Power Consumption: Compared to other types of 400G modules, the SR4 module uses VCSEL lasers, which consume less power, helping to reduce overall operational costs.<\/li>\n\n\n\n<li>Cost-Effectiveness: The SR4 module is relatively low-priced, providing an economical choice for building high-performance networks.<\/li>\n\n\n\n<li>Ease of Deployment: The standard QSFP-DD interface and MPO\/MTP-12 connectors make the SR4 module easy to install and maintain.<\/li>\n<\/ul>\n\n\n\n<p>In this solution, the SR4 module is chosen on the switch side, and correspondingly, the OSFP 400G SR4 module is used on the server side (similar advantages can be observed when compared to the <a href=\"https:\/\/www.fibermall.com\/sale-460322-nvidia-mms4x00-ns400.htm\" target=\"_blank\" rel=\"noreferrer noopener\">OSFP 400G DR4<\/a>), achieving a match in Serdes.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img decoding=\"async\" src=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/12\/SR4-2-1024x429.png\" alt=\"sr4\" class=\"wp-image-6763\" style=\"width:800px\" width=\"800\" srcset=\"https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/12\/SR4-2-1024x429.png 1024w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/12\/SR4-2-300x126.png 300w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/12\/SR4-2-768x322.png 768w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/12\/SR4-2-1536x643.png 1536w, https:\/\/www.fibermall.com\/blog\/wp-content\/uploads\/2023\/12\/SR4-2-2048x858.png 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>As a new choice for high-performance networks, the QSFP-DD 400G SR4 optical module not only meets the current high-speed network requirements of data centers but also provides robust support for the future development of networks. Its introduction marks a significant step forward in network technology towards higher rates and greater efficiency, laying a solid foundation for network communications in the era of AI and big data. With continuous technological advancements and further cost reductions, the QSFP-DD 400G SR4 module is set to become the preferred solution for constructing modern high-performance networks.<\/p>\n<style>\r\n\r\n        .lwrp.link-whisper-related-posts{\r\n            \r\n            margin-top: 40px;\nmargin-bottom: 30px;\r\n        }\r\n        .lwrp .lwrp-title{\r\n            \r\n            \r\n        }\r\n        .lwrp .lwrp-description{\r\n            \r\n            \r\n\r\n        }\r\n        .lwrp .lwrp-list-container{\r\n        }\r\n        .lwrp .lwrp-list-multi-container{\r\n            display: flex;\r\n        }\r\n        .lwrp .lwrp-list-double{\r\n            width: 48%;\r\n        }\r\n        .lwrp .lwrp-list-triple{\r\n            width: 32%;\r\n        }\r\n        .lwrp .lwrp-list-row-container{\r\n            display: flex;\r\n            justify-content: space-between;\r\n        }\r\n        .lwrp .lwrp-list-row-container .lwrp-list-item{\r\n            width: calc(100% - 20px);\r\n        }\r\n        .lwrp .lwrp-list-item:not(.lwrp-no-posts-message-item){\r\n            \r\n            list-style: decimal;\r\n        }\r\n        .lwrp .lwrp-list-item img{\r\n            max-width: 100%;\r\n            height: auto;\r\n        }\r\n        .lwrp .lwrp-list-item.lwrp-empty-list-item{\r\n            background: initial !important;\r\n        }\r\n        .lwrp .lwrp-list-item .lwrp-list-link .lwrp-list-link-title-text,\r\n        .lwrp .lwrp-list-item .lwrp-list-no-posts-message{\r\n            \r\n                \r\n        }\r\n        @media screen and (max-width: 480px) {\r\n            .lwrp.link-whisper-related-posts{\r\n                \r\n                \r\n            }\r\n            .lwrp .lwrp-title{\r\n                \r\n                \r\n            }\r\n            .lwrp .lwrp-description{\r\n                \r\n                \r\n            }\r\n            .lwrp .lwrp-list-multi-container{\r\n                flex-direction: column;\r\n            }\r\n            .lwrp .lwrp-list-multi-container ul.lwrp-list{\r\n                margin-top: 0px;\r\n                margin-bottom: 0px;\r\n                padding-top: 0px;\r\n                padding-bottom: 0px;\r\n            }\r\n            .lwrp .lwrp-list-double,\r\n            .lwrp .lwrp-list-triple{\r\n                width: 100%;\r\n            }\r\n            .lwrp .lwrp-list-row-container{\r\n                justify-content: initial;\r\n                flex-direction: column;\r\n            }\r\n            .lwrp .lwrp-list-row-container .lwrp-list-item{\r\n                width: 100%;\r\n            }\r\n            .lwrp .lwrp-list-item:not(.lwrp-no-posts-message-item){\r\n                \r\n                \r\n            }\r\n            .lwrp .lwrp-list-item .lwrp-list-link .lwrp-list-link-title-text,\r\n            .lwrp .lwrp-list-item .lwrp-list-no-posts-message{\r\n                \r\n                    \r\n            }\r\n        }<\/style>\r\n<div id=\"link-whisper-related-posts-widget\" class=\"link-whisper-related-posts lwrp\">\r\n            <h3 class=\"lwrp-title\">Related Posts<\/h3>    \r\n        <div class=\"lwrp-list-container\">\r\n                                            <ul class=\"lwrp-list lwrp-list-single\">\r\n                    <li class=\"lwrp-list-item\"><a href=\"https:\/\/www.fibermall.com\/blog\/sfp-dd.htm\" class=\"lwrp-list-link\"><span class=\"lwrp-list-link-title-text\">SFP-DD: The Future of Optical Transceiver Technology Explained<\/span><\/a><\/li><li class=\"lwrp-list-item\"><a href=\"https:\/\/www.fibermall.com\/blog\/4-200g-technology-fr.htm\" class=\"lwrp-list-link\"><span class=\"lwrp-list-link-title-text\">Analysis of 4x200G Technology in FR Scene<\/span><\/a><\/li><li class=\"lwrp-list-item\"><a href=\"https:\/\/www.fibermall.com\/blog\/ocp-emea-2025-800g-modules-immersion-cooling.htm\" class=\"lwrp-list-link\"><span class=\"lwrp-list-link-title-text\">OCP EMEA 2025: FiberMall Demonstrates 800G Pluggable Optical Modules with Immersion Cooling Systems<\/span><\/a><\/li><li class=\"lwrp-list-item\"><a href=\"https:\/\/www.fibermall.com\/blog\/48-port-poe-switch.htm\" class=\"lwrp-list-link\"><span class=\"lwrp-list-link-title-text\">Understanding the Benefits of a 48-Port Gigabit Ethernet PoE Switch<\/span><\/a><\/li><li class=\"lwrp-list-item\"><a href=\"https:\/\/www.fibermall.com\/video\/40g-qsfp-sr-bd-rx-module.htm\" class=\"lwrp-list-link\"><span class=\"lwrp-list-link-title-text\">How does 40G QSFP module works only as a receiver?[40G QSFP+ SR BD RX]<\/span><\/a><\/li>                <\/ul>\r\n                        <\/div>\r\n<\/div>","protected":false},"excerpt":{"rendered":"<p>When building a high-performance AI cluster, selecting the appropriate optical module is crucial for ensuring the speed and stability of network communications. With the continuous advancement of NVIDIA GPU cards, the computing power of single-card GPUs has seen significant improvements. As AI models grow in size, the demands for network bandwidth and transmission efficiency also [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":6767,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"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":"","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":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center 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