<div dir="ltr"><div class="gmail_default" style="font-family:tahoma,sans-serif">Model of mobo and CPU model will help to determine what speed the RAM will be clocked at. <br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">What is the speed rating of the used DDR3?</div><div class="gmail_default" style="font-family:tahoma,sans-serif">As a rule, you *can* use slower RAM, but the entire system will clock down to accommodate the slower RAM(which you no want).</div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br clear="all"></div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div>Thanks,<br><br>Ron S.<br><br></div></div></div></div></div></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Mar 7, 2022 at 9:44 PM Ronald Barnes <<a href="mailto:ron@ronaldbarnes.ca">ron@ronaldbarnes.ca</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
Hi,<br>
<br>
I'm looking at FreeGeek - they have used DDR3 RAM sticks @ 2x4 GiB for <br>
$15/each.<br>
<br>
My PC has 2x8 GiB DDR3 RAM (1333MHz) (CMZ8GX3M1A1600C10).<br>
<br>
<br>
How concerned to I need to be in matching CAS / latency between current <br>
and potential newly-used upgrade RAM?<br>
<br>
<br>
The Corsair Vengence page that matches my Product ID:<br>
<br>
 > <br>
<a href="https://www.corsair.com/us/en/Categories/Products/Memory/High-Performance-Memory/Vengeance%C2%AE-%E2%80%94-8GB-DDR3-Memory-Kit/p/CMZ8GX3M1A1600C10#tab-tech-specs" rel="noreferrer" target="_blank">https://www.corsair.com/us/en/Categories/Products/Memory/High-Performance-Memory/Vengeance%C2%AE-%E2%80%94-8GB-DDR3-Memory-Kit/p/CMZ8GX3M1A1600C10#tab-tech-specs</a><br>
<br>
<br>
Conveniently, they mention "Tested Latency 10-10-10-27" and " SPD <br>
Latency 9-9-9-24".  "?"<br>
<br>
<br>
Also, There the speed rating is 1600MHz while lshw shows 1333MHz:<br>
<br>
 > description: DIMM DDR3 Synchronous Unbuffered (Unregistered) 1333 MHz<br>
<br>
<br>
All I know is, "do not buy RAM with lower speed than currently installed".<br>
<br>
<br>
<br>
Can anyone advise me further?<br>
<br>
<br>
<br>
Thanks!<br>
<br>
rb<br>
<br>
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</blockquote></div>