[SOLVED] Rysen 3700X memory compatibility

finwizz

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Mar 3, 2019
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For a X570 Motherboard with 32Gb memory, will CAS16 work? The price difference between DDR 4 3600 16 CAS and DDR 4 3600 14 CAS is nearly twice as much (I am in UK).

If I go with DDR 4 3200 memory - will tere be much performance difference with 3600?
 

PC Tailor

Distinguished
Herald
Hello my friend!

In regards to CAS Latency, really this won't affect compatibility assuming you aren't mixing modules. And speed is typically more important than CAS in most research.

If you are running a Ryzen rig, it does prefer faster RAM, and you'll find that actually you can reap some (at least minor) benefits from going to 3600 over 3200.

Whilst you should take any youtube video with a pinch of salt, this will kind of the get the idea across (I'm assuming you're using your rig primarily for gaming):

View: https://www.youtube.com/watch?v=kP9F0h7qP_g


You'll see the 3600 always has slightly better FPS, and in some, a good 20/30+ FPS.
In so far as CAS Latency, you'll LIKELY find there won't be much of a noticeable difference. However you'll notice differences in RAM speeds with a Ryzen rig.
 
Reactions: finwizz

PC Tailor

Distinguished
Herald
Hello my friend!

In regards to CAS Latency, really this won't affect compatibility assuming you aren't mixing modules. And speed is typically more important than CAS in most research.

If you are running a Ryzen rig, it does prefer faster RAM, and you'll find that actually you can reap some (at least minor) benefits from going to 3600 over 3200.

Whilst you should take any youtube video with a pinch of salt, this will kind of the get the idea across (I'm assuming you're using your rig primarily for gaming):

View: https://www.youtube.com/watch?v=kP9F0h7qP_g


You'll see the 3600 always has slightly better FPS, and in some, a good 20/30+ FPS.
In so far as CAS Latency, you'll LIKELY find there won't be much of a noticeable difference. However you'll notice differences in RAM speeds with a Ryzen rig.
 
Reactions: finwizz

finwizz

Great
Mar 3, 2019
130
4
85
0
You'll see the 3600 always has slightly better FPS, and in some, a good 20/30+ FPS.
In so far as CAS Latency, you'll LIKELY find there won't be much of a noticeable difference. However you'll notice differences in RAM speeds with a Ryzen rig.
Thanks for this. Can 3200 be overclocked with 16CAS? Do I need specific 3200 memory?
 

PC Tailor

Distinguished
Herald
Thanks for this. Can 3200 be overclocked with 16CAS? Do I need specific 3200 memory?
Technically if you were to get 3200, it would first run at the boards native frequency, which is usually 2133. Then you would enable XMP, which is a form of overclocking, to take it up to its rated speed.

You can then overclock beyond this, but that's where your likelihood for instability increases, and you have to be more careful as you're taking it out of manufacturer's specification.

You can adjust CAS latency accordingly, it's just a balancing act to work out what is stable.

A full and better guide is here: https://www.tomshardware.co.uk/ram-overclocking-guide,review-33633-3.html

Personally, I think it's easier to simply get RAM that's rated to the speed you want to achieve.
 
Reactions: finwizz

finwizz

Great
Mar 3, 2019
130
4
85
0
Technically if you were to get 3200, it would first run at the boards native frequency, which is usually 2133. Then you would enable XMP, which is a form of overclocking, to take it up to its rated speed.

You can then overclock beyond this, but that's where your likelihood for instability increases, and you have to be more careful as you're taking it out of manufacturer's specification.

You can adjust CAS latency accordingly, it's just a balancing act to work out what is stable.

A full and better guide is here: https://www.tomshardware.co.uk/ram-overclocking-guide,review-33633-3.html

Personally, I think it's easier to simply get RAM that's rated to the speed you want to achieve.

Thanks again.
 

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