1333MHz ram runs only 666MHz
Printed From: ASRock.com
Category: Technical Support
Forum Name: AMD Motherboards
Forum Description: Question about ASRock AMD motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=2053
Printed Date: 05 Jan 2025 at 6:56am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: 1333MHz ram runs only 666MHz
Posted By: jmorten
Subject: 1333MHz ram runs only 666MHz
Date Posted: 23 Feb 2016 at 6:10am
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Hi I have a ram problem, on my E35LM1 motherboard I have fitted a Kingston ValueRAM DDR3-1333 SC - 4GB, but a test with Speccy shows that it only runs 666 MHz, why does it not run faster?
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Replies:
Posted By: Xaltar
Date Posted: 23 Feb 2016 at 6:17am
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666 x 2 = 1333 Most reporting apps report the unmultiplied clock  ------------- 
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Posted By: jmorten
Date Posted: 24 Feb 2016 at 11:26pm
| Thank you it makes sense, but there is a program that shows the proper speed for the ram block? |
Posted By: Xaltar
Date Posted: 25 Feb 2016 at 1:08am
Here is a screenshot from CPUz of my memory: As you can see it lists the unmultiplied clock in brackets. If your RAM is showing say 333 in brackets (in the case of your DDR3 1333) then you know it is working at half it's rated speed. If it shows 666 as you stated in your first post then it is working as it should. This is the reason for the DDR adage at the front of the RAM type, DDR = Double Data Rate and the number after that denotes generation so DDR, DDR2, DDR3 and DDR4 with each successive generation improving performance. So in theory DDR @400 (200mhz x2) should be slower than DDR2 @400 which will be slower than DDR3 clocked @400 etc I hope this clarifies things for you. The DRAM frequency is always listed as the unmultiplied figure. CPUz is the go to tool to check this but even in speccy it lists RAM as "Dual/Single Channel (model) @666mhz". Note that it has "mhz" on the end, this usually means that it is listing the DRAM frequency not the rated speed.
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