WEBVTT

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so you've bought some shiny new RAM sticks for your computer you've made

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sure that they're the right speed and they're the right voltage and you even

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paid extra for that sick RGB lighting bro but when you furiously rip off the

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packaging and are just about to insert the modules into your motherboard you

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notice a strange sequence of numbers on

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the stickers and start wondering what those mean is there some crucial

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specification you've missed before buying your RAM these numbers here are

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called memory timings and they are one of the factors that determine the

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performance of a d module but how does

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that work doesn't RAM frequency in

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megahertz already tell us how fast it goes not quite while the clock speed can

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tell us how much data your RAM can send and receive per second it doesn't tell

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us anything about latency the delay between operations which you can learn

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more about up here that is where timings come in they give you information about

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how quickly memory can be accessed before the data starts flying around

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let's start with the first number in the string this is called cast latency this

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is the time it takes for the RAM module to start responding to a request for

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data measured in clock Cycles in general

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this means that a lower cast latency is better but because different RAM modules

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run at different clock speeds you have to consider them together with the

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frequency to find the total real world

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latency in Nan seconds using this formula so check this out slower clocked

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RAM can effectively be quicker if it has a lower cast latency something to keep

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in mind when buying your memory though remember your speed is still going to be

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more important generally speaking but what about those other numbers the

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second is a mouthful row address to column address delay or trcd you see RAM

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is set up in a grid and your computer needs to access a particular row before

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finding which column of that row has the piece of data that it wants so this

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number expresses the small delay between row and column access the third number

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is row pre-charge time or trp referring to the latency involved in opening a new

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row and the fourth is row active time or

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TR the minimum number of clock cycles that a row must stay open to ensure the

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data is read or written properly that's

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why this one is longer than your other timings and how does all of this affect

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the way that you configure your RAM modules when you first slot them into

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your motherboard most modern bioses will have a pre-loaded XMP profile that you

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can enable to ensure that these modules are running at their rated speed voltage

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and timings but if you want to get the fastest speeds possible you can actually

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lower or tighten your timings then run a

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stress test like me test 86 plus to validate that your changes aren't

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causing any system instability I would recommend changing each of the first

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three numbers by an increment of one and then validating in between perhaps

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giving your RAM or memory controller a bit more voltage if things look unstable

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but to be sure check Intel or AMD's recommended voltages to make sure you're

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not going too high once you've done that adjust your TR accordingly and you're

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pretty much done once your RAM is stable although it's been a while since

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tightening timings has given a noticeable real world performance boost

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in most applications early reports are

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indicating that RAM speeds matter far more with AMD's new ryzen Chips than on

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the Intel side so if you really want to dive into the world of Enthusiast

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tinkering and you've got a ryzen based system you might want to give adjusting

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your timings a shot at the very least it'll be something else to experiment

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Linus all right guys thanks for watching if you like the video like it if you

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