Worth buying second kit of 4000mhz ram for a 5800x

Hardware Build a PC
1

So I recently built a 5800x PC and got a set of 4000mhz CL15 ram (2x8GB). (though it can only run CL16 stable)

I’ve been reading that Zen3 really likes having 4 sticks rather than two (as opposed to zen 1 & 2).

I’m wondering if ram of the speed I’m using (all videos compared 3600/3800 Cl16 to 3200 CL14) it would still make a difference?

I do plan to expand ram eventually and I’m a bit worried with DDR5 on the horizon I may not be able to get the same kit.

There’s also the question if my motherboard can run all 4 sticks at 1.5v (XMP profile), it’s an Asus TUF X570-Plus.

Some input would be appreciated, thanks!

2

Probably will lose some speed if you throw two more sticks in, do you need more memory?

3

I likely will in a few years time, since 16gb is becoming low (I intend to future proof this system).

Also how would I lose speed, all the benchmarks show Zen3 performs better with 4 vs 2 sticks.

4

Sell 2x8gb, but 2x16gb kit?

5

Guessing those are all SR sticks not DR

6

I’m not sure the difference, this is the kit I bought G.SKILL F4-4000C15D-16GVK (G.SKILL Ripjaws V Series 16GB (2 x 8GB) 288-Pin DDR4 SDRAM DDR4 4000 (PC4 32000) Intel XMP 2.0 Desktop Memory Model F4-4000C15D-16GVK - Newegg.ca)

7

It doesn’t actually say but I would assume at that capacity its single rank not dual rank

8

From my experience with x470 crosshair vii and 3950x it doesn’t really pay to go beyond 3600MHz. I have 4x8Gb samsung b die 3200cl14 kit of flarex and it does great at 1.45V 3600 14 15 15 15 30.

9

I am not an expert when it comes to memory…I found this information very helpful for dialling in my memory: https://www.hisevilness.com/articles/technology/overclocking-guide-for-ddr4-ram.amp.html?showall=1

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I’m not overclocking, just using the DOCP/XMP profile.

11

is overclocking just not manual

12

I thought when it comes to memory anything above the default/base speed of your kit (2100, 2400, or 2666) was considered an overclock. I imagine you’d have better performance running 3600 than 4000 because at 3600 your FClk will be 1:1 with your memory. FClk on ryzen tops out at 1800MHz unless you manually override that. But I’ve had very little success getting my 3950X FClk above 1800. You can certainly run 4000 kit at 3600, and probably tighten the timings as well.

13

You most certainly got charged a premium if you bought a 4000 kit. For friends building ryzen systems I always recommend 3200cl14 kits because most if not all are Samsung b die and they will easily run 3600 with solid timings and can pretty comfortably run 3800 if you manage to get FClk to 1900. 3200cl14 kits are pretty good bang for your buck. I’d run Thaiphoon burner and Dram calculator and shoot for 3600 on a ryzen system.

14

I don’t really care about the value part as I have some money to burn just want opinions if it’s worth it. but it was only $250 CAD for the kit, which isn’t so bad.

15

You’d have to run a memory benchmark to be sure of this, but my guess is you’ll have worse performance with 4000MHz than 3600MHz. So I guess it’s up to you how well you want the system to run. If I had plenty of money to spend on my system I’d still want it performing as well as possible.

16

I just check some of the top 3dMark scores with that 5800X CPU. It looks like the highest people go on the memory is around 3800MHz. But I’m not sure how easy it is to FClk stable at 1900MHz. It might be m ore work than it’s worth. If you run 3600MHz kit and FClk at Auto that’d be the easiest. Hope that’s helpful. Good luck and I hope you enjoy your new system!

17

If you’re just looking for simple direction:

The reason 4 sticks will sometimes work better than 2 at times is due to ram ranking, eg, Single vs Dual.

The boost can be as high as 10-20% performance. Any loss in RAM speed will be negligible; lowering the speed to 3600 and tighten the timings will also make up for speed loss.

If you have the money to burn. go ahead and get another set of the same exact RAM. Lower speed to 3600 and tighten the timings.

You’ll see a general performance uplift across the board.

18

Why

19

My 5930k was choking on modern games with my 3080 sadly.

1 Like
20

More , why 5800x?