請問插 ram 使用多少電壓 是自動的嗎? - 3C
By Tracy 
at 2021-10-16T20:47
at 2021-10-16T20:47
Table of Contents
※ 引述《giorno78 (天晴)》之銘言: 
缺P幣..
: 由於記憶體有原生顆粒與非原生顆粒
: 原生顆粒使用1.2V 非原生顆粒使用1.35V到1.45V
: 請問主機板最初插上記憶體時使用多少電壓
: 是主機板自動偵測並設定的嗎?
是 但是他是怎麼偵測的呢?
 
你買來的DRAM模組上 會有顆不起眼的小EEPROM, 我們常把它他叫做 SPD
https://imgur.com/XS7ICRW
 
JEDEC有spec描述這個SPD裡面要放啥資料, 從廠商 序號 電壓 頻率
latency...之類的一堆參數都寫在這
 
你的主機板在開機過程中系統韌體會去讀取這些資料來決定要使用的參數
 
另外所謂的XMP就是, 在支援XMP的DRAM模組, SPD裡面有額外一組參數是符合XMP的
標準. 系統韌體看得懂這些資料的話 就可以根據XMP資料來設定參數
 
所以也是有人在玩這個SPD的修改來超頻之類的
 
--
    缺P幣..
: 由於記憶體有原生顆粒與非原生顆粒
: 原生顆粒使用1.2V 非原生顆粒使用1.35V到1.45V
: 請問主機板最初插上記憶體時使用多少電壓
: 是主機板自動偵測並設定的嗎?
是 但是他是怎麼偵測的呢?
你買來的DRAM模組上 會有顆不起眼的小EEPROM, 我們常把它他叫做 SPD
https://imgur.com/XS7ICRW
JEDEC有spec描述這個SPD裡面要放啥資料, 從廠商 序號 電壓 頻率
latency...之類的一堆參數都寫在這
你的主機板在開機過程中系統韌體會去讀取這些資料來決定要使用的參數
另外所謂的XMP就是, 在支援XMP的DRAM模組, SPD裡面有額外一組參數是符合XMP的
標準. 系統韌體看得懂這些資料的話 就可以根據XMP資料來設定參數
所以也是有人在玩這個SPD的修改來超頻之類的
--
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