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B650D4U-1L
B665D4U-1L
User Manual
Version 1.0
Published November 2022
Copyright©2022 ASRock Rack INC. All rights reserved.

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Table of Contents
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Summarization of Contents

Chapter 1 Introduction
Specifications
Details physical, processor, memory, and expansion slot specifications.
Motherboard Layout
Visual diagram of motherboard components and their locations.
I/O Panel
Describes the rear I/O ports and their associated LEDs.
Chapter 2 Installation
Pre-installation Precautions
Safety and handling precautions before installing components.
Installing the CPU
Step-by-step guide for installing the CPU into the socket.
Installing Memory Modules (DIMM)
Guide for installing DDR5 DIMM modules and recommended configurations.
Dr. Debug
Lists and describes Dr. Debug POST codes for troubleshooting.
Chapter 3 UEFI Setup Utility
Introduction
Overview of the UEFI Setup Utility and how to access it.
Main Screen
Details the system overview displayed on the UEFI Main screen.
Advanced Screen
Accesses advanced system configuration options.
Security
Manages system security settings like passwords and Secure Boot.
Boot Screen
Configures boot settings and priority for system devices.
Chapter 4 Software Support
Download and Install Operating System
Instructions for downloading and installing the operating system.
Download and Install Software Drivers
Guide to downloading and installing necessary system drivers.
Chapter 5 Troubleshooting
Troubleshooting Procedures
Step-by-step procedures to resolve common system issues.
Technical Support Procedures
Information required for contacting technical support.

Table of Contents