RAM, what you need to know.
Printed From: ASRock.com
Category: OverClocking(OC) Zone
Forum Name: OC Build Advice
Forum Description: Need advice on your OC weapon? Discuss here
URL: https://forum.asrock.com/forum_posts.asp?TID=14239
Printed Date: 26 Apr 2024 at 7:13pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: RAM, what you need to know.
Posted By: Xaltar
Subject: RAM, what you need to know.
Date Posted: 28 Apr 2020 at 11:09pm
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I see people complaining about RAM not running at it's advertised speeds all the time on the forums. This is a misnomer that I repeatedly have to explain so here I am explaining everything in one place for anyone that needs the info. RAM uses 2 factors to determine frequency: JDEC (sometimes called SPD) - This is the RAM's default frequency(/s). It is a collection of timings and frequencies the RAM is actually designed to operate at. This is guaranteed XMP (eXtreme Memory Profile)- This is a saved overclocking profile that the RAM manufacturer has fine tuned and tested on a broad spectrum of systems. It will almost certainly work on system configurations it was tested with but is not guaranteed to work on all systems.  Here is a screencap of SPD settings taken from CPU-Z (a free app) These profiles are saved on the RAM sticks themselves on a small chip called the SPD chip. XMP is most often only tuned for one system type (AMD or intel). This is why you see "Ryzen Ready" or "intel Ready" on some RAM packaging. The memory controller on intel and AMD CPUs operate differently. This is why what works on intel doesn't always work on AMD systems and vice versa. This has improved with new CPU generations as both sides try to improve compatibility but is still problematic even now. So, when you are buying RAM, please look at the RAM's product page to at the very least check if it is tuned for intel or AMD before buying and ensure that it is tuned for the system you plan to build. If your RAM does not run at it's XMP rating it does not mean you have a defective motherboard, far more likely is that you are using RAM that has an XMP profile that is not tuned for your system (AMD/intel). There are ways to manually set your RAM's frequency and timings, essentially tuning your overclock for your system. There are a lot of guides about this available on the internet so have a look for one if you are not able to get your RAM to run at it's XMP speed. Sometimes however, the RAM is just not compatible so this is not a guarantee. ------------- 
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