Which RAM for Ryzen 5 4600H?

So I know it supports 3200MHz

But when I look up DDR4 on Wiki, it has 3 options listed



When I look for RAM, there are 2 kits by Crucial. One is CL22 and one is CL16 (Ballistix)

Is it worth paying extra for the CL16 kit? Will it even run with those timings?

What if I find some with even lower CL than 16, is it worth paying a little more if I get a good price?

 

CL16 is certainly better than CL20, CL22 or even CL24.

Tighter timings = better overall performance and responsiveness from the APU.

The system should easily run at CL16... timings are not dependent on your computer to support it... RAM speed is.

If RAM is operating at 3200MhZ by default (And we know the APU supports it) and you found this RAM with CL16 timings, then the timings should function out of the box.

Zen 2 is a bit less dependent on RAM speed and timings than Zen 1 and +, however, lower timings still make an impact on CPU and iGP performance.

 

I had bought 2 sets of 16gb(8+8) RAMs of 2 different clock speeds @ 2666mhz and 3200mhz for my acquisition, both from Klevv.
One which now is in hand, with 4600H+gtx1650 combo.
Another which I'm awaiting to get with 4800H+1660ti combo.

 

This!!! Is why we see the TongFang/Elutroniks RP15/17 variants offered in other parts of the world, doesn't necessarily cones with 3200mhz RAMs.

 

Not unless the BIOS has XMP support, and the board can handle those timings.

 

I found out my laptop (Dell G5 SE) doesn't have XMP support

So which is the best RAM for me?

 

Kingston HyperX has ddr4-3200 cl20 jedec timings.

 

Isn't XMP only to overclock RAM speed (not RAM timings)?

 

Why don't OEM's integrate XMP support into AMD laptop BIOS?
Its not that difficult.

 

JEDEC timings for 3200MHz are CL20/CL22/CL24 as per OP's image. Anything tighter than that is XMP.

 

I was under the impression XMP can overclock the RAM to higher frequencies, but that timings themselves don't intricately depend on XMP profile.
Still, frequencies cannot function without certain timings, so it makes sense that those would tie into it.
Though, why isn't JEDEC modified to operate on CL16 in the first place?
Why bother with XMP?

 

JEDEC timings need to be conservative for broad compatibility reasons. 3200MHz CL16 would certainly not run on the vast majority of laptops and cause issues with non-boot and blue screening.

 

So I don't fully understand this.



Does this mean that I would see no difference between the following sticks of RAM

DDR4-1600 CL10
DDR4-2400 CL15
DDR4-3200 CL20

And do manufacturers every make sticks of RAM that are sold as say DDR4-3200 CL20 but it's actually DDR4-2666 CL20 with XMP for 3200Mhz?

 

Those three have the same true latency, but 3200C20 would be best since it has the highest throughput at the same true latency.

3200C20 is an official JEDEC timing, it wouldn’t require XMP to run at that spec, assuming your platform supports that speed.

 

But is it possible for a manufacturer to sell RAM which is say JEDEC 2400C15 but has XMP profiles for 3200C20, and then sell it as that?

Just found this on eBay

https://www.kingston.com/dataSheets/HX429S17IBK2_32.pdf

Apparently it's standard JEDEC/PnP timing is 2933C17 which would make it faster than 3200C20 or anything else

But CL17 isn't listed for 2933MHz on the Wiki...

I do not understand this at all

 

I tested this kit in the G5 SE and it worked fine at DDR4-3200 CL20:

https://www.kingston.com/dataSheets/HX432S20IBK2_32.pdf

I also tested a DDR4-2666 CL15 kit in it as well, which worked fine, but I noticed that infinity fabric never scaled up above 2666mhz with that kit installed, so running at the slower speed may be more detrimental overall. I also believe the IGPU can benefit from increased memory bandwidth as it copies framebuffers from the dedicated GPU into system ram for output on the internal LCD.

That being said I am curious about the differences with the 2933 CL17 ram, so if you do get it be sure and report your findings!

 

I will second these. They are Micron E-die. You will get 3200 @ 1.2V out of the box, and mine are working at 3460 using the default 3200 timings. YMMV

 

I would advise against the hyperX 3200. What makes ram fast is actually true latency, which essential the lower the value the better. The latency for them will be 12.5 , while the 2666 at CL15 will be 11.25 from hyper x. The main forerunner for none xmp systems that cannot change memory timings is the corsair vengeance 3000 CL16.

It will also depend on the software, and for that matter I am not certain how ryzen works well enough. Also, remember to get dual rank ram sticks as well.

 

I have these. They still require XMP, otherwise will run at 2666 CL18.

 

Yep I got the 2666 CL15 kit and noticed the same thing. 2933C17 and 3200C20 are both so much more expensive though from what I can find

 

It might have been these Ripjaws, which in one review in it the buyer is having a difficult time getting 3000mhz to work even with a high end piece. https://www.newegg.com/g-skill-32gb-260-pin-ddr4-so-dimm/p/N82E16820232310

Otherwise the hyperx 2666 is the none xmp winner. last I remember, many oem's and resellers dont even offer ram past 2666mhz due to stability issues, though that supposedly was an issue that was solved with 8th gen intel cpus.