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In computing, serial presence detect (SPD) is a standardized way to automatically access information about a memory module.Earlier 72-pin SIMMs included five pins that provided five bits of parallel presence detect (PPD) data, but the 168-pin DIMM standard changed to a serial presence detect to encode more information.
Modern DIMMs include a Serial Presence Detect (SPD) ROM chip that contains recommended memory timings for automatic configuration as well as XMP/EXPO profiles of faster timing information (and higher voltages) to allow for a performance boost via overclocking. The BIOS on a PC may allow the user to manually make timing adjustments in an effort ...
A system designer should work with their memory and BIOS vendors to implement a suitable SPD programming. As such, the MRC is a part of the BIOS (or firmware) of an Intel motherboard. George Chen, a research and development (R&D) director at ASUS, described it in 2007 as follows: [1]
Intel i945GC northbridge with Pentium Dual-Core microprocessor. This article provides a list of motherboard chipsets made by Intel, divided into three main categories: those that use the PCI bus for interconnection (the 4xx series), those that connect using specialized "hub links" (the 8xx series), and those that connect using PCI Express (the 9xx series).
As far as I can tell, XMP is a means of providing factory-overclocked settings. But what's the purpose of using XMP over simply encoding the factory overclock as SPD? Either way the manufacturer typically advertises and warranties the higher specification, so what is gained by making the overclock distinct from the stock clock?
Compared to DDR2 memory, DDR3 memory uses less power. Some manufacturers further propose using "dual-gate" transistors to reduce leakage of current. [10]According to JEDEC, [11]: 111 1.575 volts should be considered the absolute maximum when memory stability is the foremost consideration, such as in servers or other mission-critical devices.
Support XMP 3.0; Up to 28 PCI Express ... On August 2, 2024 Intel announced they would extend warranty for certain retail (boxed) 13th/14th generation Core CPUs by ...
Additionally, Zen 4 supports new AMD EXPO SPD profiles for more comprehensive memory tuning and overclocking by the RAM manufacturers. Unlike Intel's XMP, EXPO is marketed as an open, license and royalty-free standard for describing memory kit parameters, such as operating frequency, timings and voltages. It allows to encode a wider set of ...