WEBVTT

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what RAM you choose can have a profound effect on the performance of your new

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gaming pc but because memory isn't as

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sexy as cpus or graphics cards it often

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gets overlooked well not today

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behind me courtesy of g skill is 11 kits

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of dual channel ddr4 memory and with it

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we intend to ARM you guys with all the information that you need to choose the

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best option for your new 3rd gen AMD ryzen system what's going in and out of

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your pc when you're connected to the internet well with glasswire you can

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find out and see if there are any suspicious or badly behaving apps use

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offer code Linus to get 25 off at the link in the video description

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AMD's new zen 2 course have twice as much onboard on-board high-speed cache

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which keeps them fed with data much more efficiently than before

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which is great but the thing is all of that cache still

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has to pull data from somewhere which means that we still need fast system

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memory now third gen ryzen increases the

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stock supported memory speed all the way up to a whopping 3 200 megahertz that

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means that not only can you count on that speed being a good fit for the

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platform you can also count on being able to achieve much higher speeds than

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you previously could and that's even without the best RAM chips that money

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can buy and a degree in overclocking from the university of oh my god i'm so

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bored when will this end so that sounds great

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just buy the fastest cheapest RAM you can find and run that is what i might

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say if it weren't for the close relationship between memory bandwidth

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and the high speed interconnect between ryzen CPU cores called the infinity

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fabric now this generation AMD has opened up some new and interesting

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options by allowing users to decouple the infinity fabric clock from the

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memory clock so from stock speed around 3200 up until around ddr4 3600 which

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most people should be able to hit you'll be at what AMD refers to as one to one

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that is to say both the memory and the infinity fabric share the same input

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clock and run in sync just like last gen but it's also possible to crank your RAM

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speeds much higher than you otherwise could by abandoning that one-to-one

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ratio so that needs to be investigated

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because higher memory speeds should yield an increase in raw throughput but

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they could also cost you dearly because of the extra latency that is introduced

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due to the unsynchronized clocks making matters even more complicated you

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can also go the other way and crank your

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infinity fabric clock even if you have slower memory modules that can't keep up

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then you can try to make up some of that latency penalty by tightening up your

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RAM timings so we began our journey by making some

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educated guesses first because the infinity fabric is

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known to reliably hit 1800 megahertz

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investing in a ddr4 3600 kit and running

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that at one to one should be a pretty safe bet and then the

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lower the rated latencies the better the overall performance in theory

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second there's probably a higher tier of

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performance to be had by decoupling the infinity fabric and the memory speeds if

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you're willing to put in the work because otherwise why in the devil would

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AMD have put the engineering resources into making that an option

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many questions still remain though so to answer them we gathered our giant pile

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of g-skill tridency memory high speed low latency kits high latency low speed

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kits and then everything in between and locked Anthony in a room until he was

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finished testing them let's start on the lower half of the

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performance spectrum here we see that memory speeds lower

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than 3 200 megahertz are in fact pretty harmful to Ryzen 3rd gen's overall

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performance that is unless we run slow but very low

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latency memory and then crank our infinity fabric as high as we possibly

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can which on our chip was about 1900

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megahertz that actually yielded performance

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similar to our low latency 3200 megahertz kit

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but at two thirds the memory clock speed

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so then if you can't afford or find a high frequency RAM kit cranking your

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infinity fabric could help make up a lot of the difference especially if you get

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a golden chip then when we switch to the higher performance kits things get even

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more interesting now at first as you might expect going

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from 3200 to 3600 and then 37 33

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megahertz makes for some pretty healthy boosts in performance particularly on

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those low latency kits but look what

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happens when we go to 3 800 megahertz and beyond

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as a result of the higher latencies involved with memory this fast and the

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desynchronized infinity fabric we actually end up losing some performance

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putting our infinity fabric back to 1900 megahertz which is the highest that ours

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will go without crashing we do pick back up a little bit particularly with our 3

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800 megahertz kit since that can run at that nice sweet one to one ratio

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now as of writing ddr4 3600 can be found

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for around the same price as 3200 depending on where you live and where

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you look so we also tried running both of those memory frequencies at the

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maximum infinity fabric clock that we could muster and it turns out that

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depending on the application this can provide a boost or a slight hindrance to

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your overall performance finally because Anthony couldn't leave

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well enough alone we ran the fastest one-to-one ratio kit that we could and

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tightened up the timings to test memory overclocking potential and holy shmoley

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with averages anywhere from two to eight percent higher than our previous best

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and percentiles jumping up by up to 27

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we've not only validated our low latency results for the 21 33 megahertz kit but

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we can also confidently say that aggressively tightening timings on any

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memory kit on ryzen can dramatically improve your gaming experience

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if not your cinebench score which didn't really seem to care about any of this

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unfortunately this is where our journey into high-speed memory on Ryzen 3rd

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gen ends at least in these early days

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we did manage to reach 4 000 megahertz RAM stable by the way guys but we had to

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dig deeper into system voltage adjustments that were not that

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comfortable recommending to the average user and then we weren't able to get

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anything beyond that to post at least with our CPU the good news is that we've

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already got enough results to boil down our recommendations to a few key points

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number one don't stress the super high

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memory speeds and instead target memory that your system can support

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if all you want is something that's fast but that you know will work grab a 3600

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megahertz kit with low latencies number two if you're adventurous

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go for it get a higher end kit and see how far you can push your infinity

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fabric the worst case scenario is you can clock the memory down and use dram

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calculator verizon to help you convert that extra speed headroom into tighter

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timings it's not going to result in worse performance under any

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circumstances number three if your region's market is

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bad for memory pricing or availability you really shouldn't stress too much

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find a low latency 2133 memory kit and

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focus on overclocking your infinity fabric you'll still be getting darn near

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the full experience it really is a testament to how good of a job AMD has

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done in engineering there's n2 course that even though of course memory does

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still affect performance it's not quite as

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necessary to get a great experience as

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