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-   -   Ryzen 3000 RAM Scaling strange behaviour [Lower scores] (https://www.overclock.net/forum/10-amd-cpus/1730594-ryzen-3000-ram-scaling-strange-behaviour-lower-scores.html)

rul3s 08-01-2019 01:00 AM

Ryzen 3000 RAM Scaling strange behaviour [Lower scores]
 
Hello guys,
I'm triing to find the sweet spof of my config about RAM, but I'm going crazy, my hardware is:
- Ryzen 3700x
- Asus x470 Strix F bios 5007 (agesa 1.0.0.2)
- KFA2 HOF DDR4 4000CL19 (B-Die)
To isolate RAM performance I've setted up fixed OC to 4.1GHz, windows 1903 and drivers 1.07.07 and always set to 1:1 FCLK/RAM.

Following the Ryzen Dram Calculator I've validated 3 configs, all them stable (Testmem5 + 1000%HCI):
- [email protected] (Fast Presset) 1.365vRam 1.025vSoc
- [email protected] (Fast Presset) 1.395vRam 1.1vSoc
- [email protected] (Safe Presset) 1.450vRam 1.1vSoc

Those are my results:

https://i.ibb.co/Hzt3Dnz/results.jpg

As you can see, I see little gains on Cinebench, more or less the same on 3DMark CPU TimeSpy (each run goes 100-200up/down) and losing perf on some tests of Realbench...

My first concert was about stability, but as far as I know, with 1000% HCI + TestMem5 1smus_v3 config is RAM stable, and about CPU is also stable for 30min of prime + 2h realbench stress test.

How can I understand this behaviour? Shouldn't be 3600 config outperforming all the rest?
[email protected] config is exactly the same timmings as 3200, but with more voltage, how can this be giving lower results on some test vs 3200 config?

almstsobur 08-01-2019 11:04 AM

I would dial down the CPU, shoot for low temps, base speed. I know this CPU will throttle and not show a frequency drop when doing a negative Vcore. I'm not saying that is for sure the issue, but best to eliminate that variable. Verify that you get the results you expect and go from there. Also, try different interleaving sizes with each speed, it can be a detriment for higher speed higher latency ram to be using a tiny interleave size.

rul3s 08-02-2019 01:02 AM

Quote:

Originally Posted by almstsobur (Post 28069466)
I would dial down the CPU, shoot for low temps, base speed. I know this CPU will throttle and not show a frequency drop when doing a negative Vcore. I'm not saying that is for sure the issue, but best to eliminate that variable. Verify that you get the results you expect and go from there. Also, try different interleaving sizes with each speed, it can be a detriment for higher speed higher latency ram to be using a tiny interleave size.

Good advice, I'll try it and post results ;)

rdr09 08-02-2019 01:19 AM

Quote:

Originally Posted by rul3s (Post 28070332)
Good advice, I'll try it and post results ;)

No 3466 CL14 setting? In Gen 1 and +, 3466 CL14 is the sweetest spot.

rul3s 08-02-2019 02:17 AM

Quote:

Originally Posted by rdr09 (Post 28070354)
No 3466 CL14 setting? In Gen 1 and +, 3466 CL14 is the sweetest spot.

The highest I can go with CL14-14-14-14-28-42 is 3333, thats my reference point.

Now I'm testing [email protected], with other subtimmings from another user, it's going very well, i'll post results :)

rdr09 08-02-2019 06:16 AM

Quote:

Originally Posted by rul3s (Post 28070382)
The highest I can go with CL14-14-14-14-28-42 is 3333, thats my reference point.

Now I'm testing [email protected], with other subtimmings from another user, it's going very well, i'll post results :)

Can't wait. I suspect really you have to go that high to actually see any difference. The game cache probably has something to do with it.

rul3s 08-06-2019 02:33 AM

Finally I didn't do the tests in normal speed (3.6GHz) because it wouldn't be real, as my 3700x with PBO always goes up tu 41-41.5x, I've ensured stability on this fixed speed, without C-States, and then made the tests.

The results:
https://i.ibb.co/FJSWNms/results.jpg

My custom config for 3666 is this:
https://i.ibb.co/3hzds2R/3666-custom.png


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