AMD Zen 2 Memory Performance Scaling with Ryzen 9 3900X

gupsterg · Jul 7, 2019

Thanks for all the reviews great read W1zzard.

skline00 · Jul 8, 2019

Thank you Wizzard. I use Gskill Flare-X DDR4-3200 in both my 2700x rig an my 9900k rig. Solid and FAST!

INFERNUS · Jul 8, 2019

Awesome review thank you. I'm going to upgrade my 2700x to a 3900x soon and now I'm using Flare X 3200mhz cl 14 16gb so I should be fine it looks like no reason to OC the ram or buy a new kit if I'm mainly gaming and very light encoding?

Minus Infinity · Jul 8, 2019

Another site was using 3600 CL16, which looks like what will be needed to improve over 3200 CL14. No use going past 3733 as Infinity fabric speeds drops by half.

turbogear · Jul 8, 2019

I am using 16GB G.Skill Trident Z RGB DDR4-3200 CL14 on Ryzen 2700x.

Nice to see that the performance difference to 3600 is not that much.

I will keep these.
I will most probably also keep my ASUS Crosshair VII and just upgrade the processor.
I hope TPU will also review 3800x for comparison to see how much performance difference is there to 3700x. :cool:

I will wait for a time before upgrading maybe until end of August for ASUS to iron out bugs for its C7H bios.
ASUS secrued up the new bios on C7H. With bios 2406, the mouse does not work under bios and my memory does not work at D.O.C.P profile. :mad:

With 2304 everything works fine for 2700x. I am not sure if all will be fine on new processor on current Bios.

mkdr · Jul 8, 2019

What kind of nonsense test is this? Why is there no 3200 CL16 which is like THE default and most used? Where is 3600 CL16 which is the next logic one to use?

TheLostSwede · Jul 8, 2019

mkdr said:
What kind of nonsense test is this? Why is there no 3200 CL16 which is like THE default and most used? Where is 3600 CL16 which is the next logic one to use?

Maybe there was no option to run the selected modules at those timings? Not all memory runs at all timings...
Also, early days for the UEFI, give it some time and I'm sure things will improve, they usually do.

medi01 · Jul 8, 2019

Mirkoskji said:
So basically, if you're not interested that much on having the 3 fps boost, you could potentially buy a ddr4 3000 or 2933, spending something less, and still have pretty good performance? is it right?

Yeah, but keep in mind 5% is two times more than diff between 9900k and 3700x at a typical gaming resolution.

Wyverex · Jul 8, 2019

I have spent most of the Sunday reading all the W1zzard's reviews. Great work and thanks for an informative and entertaining day

Demes · Jul 8, 2019

Is the 3000 16-18-18-38 also with 1T command rate? You seem to have omitted that from the results.

W1zzard · Jul 8, 2019

Demes said:
Is the 3000 16-18-18-38 also with 1T command rate? You seem to have omitted that from the results.

Everything is 1T

vega22 · Jul 8, 2019

W1zzard said:
Yup, and the latency matters too

W1z what's going on with the cl @ 2400/2600mhz?

3200 cl14 but 16 for slower speeds?

Imsochobo · Jul 8, 2019

vega22 said:
W1z what's going on with the cl @ 2400/2600mhz?

3200 cl14 but 16 for slower speeds?

Usually 2666 is CL16, 2666 kits refuse CL14, usually 1st gen crapkits

TheLaughingMan · Jul 8, 2019

Cool so I can just continue to use my current RAM. I have a FlareX AMD special at 3200 MHz CL14. Runs fine with my 1800X so I can just keep it paired with whatever Ryzen 2 chip I get. Thanks

nemesis.ie · Jul 8, 2019

TheLostSwede said:
Maybe there was no option to run the selected modules at those timings? Not all memory runs at all timings...
Also, early days for the UEFI, give it some time and I'm sure things will improve, they usually do.

We also need our buddy @1usmus to release the next DRAM calc with the Zen 2 options unlocked. Or does it unlock if it detects a Zen 2 CPU in the board?

Abula · Jul 8, 2019

Is it likely to able to run 3600CL16 or 3733 CL17? im just wondering since this were the recommended by AMD in the computex presentation.

Demes · Jul 8, 2019

W1zzard said:
Everything is 1T

Everything? The charts say the 3600 17-19-19-39 is at 2T though

W1zzard · Jul 8, 2019

Demes said:
Everything? The charts say the 3600 17-19-19-39 is at 2T though

Oh so the command rate was included indeed in the charts, congrats for figuring it out

Demes · Jul 8, 2019

W1zzard said:
Oh so the command rate was included indeed in the charts, congrats for figuring it out

The command rate was not included in the charts for the 3000 16-18-18-38 frequency/timings, which is why I originally asked about it. Would I be correct in saying everything except the 3600 17-19-19-39 results were at 1T command rate?

W1zzard · Jul 8, 2019

fuuuck .. now i see it .. yeah 3000 was at 1T. I'll fix the charts. Sorry!

Edit: new charts are up, nice catch

RainingTacco · Jul 8, 2019

Hmm looks like the scaling is lower than with previous zen gen. Its good that these CPUs are less dependent on good memory!

INFERNUS · Jul 9, 2019

I see no point after reading the review to upgrade my 3200mhz flare x CL 14 or even OC to 3600mhz speeds. For a 1% difference or maybe 1-2fps difference LOL

bug · Jul 9, 2019

PYRO1125 said:
I see no point after reading the review to upgrade my 3200mhz flare x CL 14 or even OC to 3600mhz speeds. For a 1% difference or maybe 1-2fps difference LOL

He, running 2800 here and I'll keep these sticks if I make the jump.

CjMitsuki · Jul 9, 2019

What the point in running 3600 with those horrendous primary timings? Ryzen first gen and Ryzen+ have no problem hitting 3533 with 14-14-14-24-38 and some of the nicer silicon on Ryzen+ can do 3600 with the same primaries. This is all with secondary and tertiary timings tightened nicely. Theres literally no point in running 3600 @ cl17 when 3466 @ cl14 is going to walk all over it. For that matter, 4000 @ cl20 is just awful and again in most scenarios 3466 - 3600 @ cl14 is going to destroy it. Only reason to ever use those higher freqs will be for applications that only care about raw bandwidth and not latency. My 3700x will arrive Wednesday then ill see how real memory scaling on Ryzen 2nd gen performs. I look forward to seeing how far we can push it over on the ROG C7H and DRAM Calc threads @ Overclock.net

nemesis.ie · Jul 9, 2019

Agreed @CjMitsuki I was seeing better results at 3333CL16 with tweaked timings on my 2700X - well until they screwed up the UEFI by adding gen 3 support! (ASRock).

I've a 3900X arriving this week so that should be fun - and to compare, I want to see how the 2 chiplets compare with the 8 core parts when set to 4+4 too.

Processor	Ryzen 7 5800X3D
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System Name	Overlord Mk MLI
Processor	AMD Ryzen 7 7800X3D
Motherboard	Gigabyte X670E Aorus Master
Cooling	Noctua NH-D15 SE with offsets
Memory	32GB Team T-Create Expert DDR5 6000 MHz @ CL30-34-34-68
Video Card(s)	Gainward GeForce RTX 4080 Phantom GS
Storage	1TB Solidigm P44 Pro, 2 TB Corsair MP600 Pro, 2TB Kingston KC3000
Display(s)	Acer XV272K LVbmiipruzx 4K@160Hz
Case	Fractal Design Torrent Compact
Audio Device(s)	Corsair Virtuoso SE
Power Supply	be quiet! Pure Power 12 M 850 W
Mouse	Logitech G502 Lightspeed
Keyboard	Corsair K70 Max
Software	Windows 10 Pro
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AMD Zen 2 Memory Performance Scaling with Ryzen 9 3900X

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