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AMD Zen 2 Memory Performance Scaling with Ryzen 9 3900X

B

bug

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erek said:
Will these native 3733 DDR4 sticks work with X570 chipset? for that magickal 1:1 IF ratio?
www.newegg.com

G.SKILL TridentZ Series 32GB (4 x 8GB) 288-Pin PC RAM DDR4 3200 (PC4 25600) Desktop Memory Model F4-3200C16Q-32GTZSK - Newegg.com

Buy G.SKILL TridentZ Series 32GB (4 x 8GB) 288-Pin PC RAM DDR4 3200 (PC4 25600) Desktop Memory Model F4-3200C16Q-32GTZSK with fast shipping and top-rated customer service. Once you know, you Newegg!
www.newegg.com www.newegg.com
Click to expand...
I think IF is only guaranteed to do 1600MHz (so DDR4 3200 would the fastest to run 1:1). Anything above is technically overclocking.
 
erek

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bug said:
I think IF is only guaranteed to do 1600MHz (so DDR4 3200 would the fastest to run 1:1). Anything above is technically overclocking.
Click to expand...

??? the article says " the DDR4-3733 "sweet spot" configuration recommended by AMD "

----


Ryzen 3950X Build Help

I'm going to do a new build around the 3950X on the X570 Platform. What motherboards do you recommend? So far i'm looking at the ASUS X570 Crosshair VIII Hero. I also need RAM recommendations. So far i've already got the following components: RTX 2080 Ti FE Inland 1TB NVMe M.2...
hardforum.com hardforum.com

"Actually AMD has said the sweet spot slide was not correct. Optimal is 3600 with 1800 1:1 IF ratio. With 3733 you have to manually set to 1866 fclk but that is not the sweet spot."
 
Calmmo

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you have to OC your IF to get 1:1 and that's not a 100% guarantee on every CPU. If you can pull it off, great if not.. (if you look even on this site some people here have had trouble with dud CPU/IF speeds, not many but enough)
 
C

CjMitsuki

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Calmmo said:
you have to OC your IF to get 1:1 and that's not a 100% guarantee on every CPU. If you can pull it off, great if not.. (if you look even on this site some people here have had trouble with dud CPU/IF speeds, not many but enough)
Click to expand...
No Overclock is ever guaranteed on any CPU...ever. With that being said, I have yet to see someone unable to run 3733 @ 1:1. It comes down to Ryzen overclocking experience memory IC quality more than it will with the cpu being the factor. Also, a good X470 board like the CH7 will help immensely. More often than not it will come down to the Cas Latency you run with said frequency with SoC and VDDG voltages being in the right range for your CPU/memory which will always be unique to the silicon quality you are working with. From what Ive seen personally, the cpu is able to go much further @ 1:1 than 3800mhz CL14 and it is the PMU firmware that needs maturing. I can easily run 32gb (8gb x 4) kit at 3800mhz CL 14-15-15-22-36 achieving around a 9100 multicore score in Geekbench. With baseclock tuning I have had the frequency around 3830mhz and could probably push further but for now is not a performance gain as I have to relax a couple of my subtimings a touch and they are all pretty much perfect at the moment.
3800MHZcl14_32GB_GB4.PNG
3800MHZcl14_32GB_Ramtest_Perftest.PNG
 
pcwolf

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Marucins said:
An interesting test.
I was looking for this information. Thank you very much.

I still wonder what will be like no 2x8 but 4x8GB?
What will the performance and clock memory of 3600 look like for 4 dice?
Click to expand...
A little late, but ...

Team Dark Pro 3200Mhz 4x8Gb four sticks running at factory clock 14-14-14-31 on Asrock X470 Taichi with AGESA 1004AB.
 
nemesis.ie

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pcwolf said:
A little late, but ...

Team Dark Pro 3200Mhz 4x8Gb four sticks running at factory clock 14-14-14-31 on Asrock X470 Taichi with AGESA 1004AB.
Click to expand...

I'm running 2 x 16GB of those at those factory timings (or a little looser/faster clocks) on the same board with the latest UEFI for the last 2 weeks. No issues.
 
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