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RYZEN DDR4 MEMORY, WHAT YOU NEED TO KNOW!

I think might have come across a bit of a breakthrough.

My 1700 will boot with 2933MHz but ONLY when I overclock the CPU and up the CPU voltage.

My guess is that because the speed of the infinity fabric between the CCX's is tied to memory clock speeds, the CPU needs to run faster to run the faster memory.

Edit: Nope. Ram just needed more voltage.
 
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Howie87 said:
I think might have come across a bit of a breakthrough.

My 1700 will boot with 2933MHz but ONLY when I overclock the CPU and up the CPU voltage.

My guess is that because the speed of the infinity fabric between the CCX's is tied to memory clock speeds, the CPU needs extra voltage when running faster memory.
Click to expand...

Where as mine is running just fine at 3295 :)
 
Just turned SenseMI skew off and now I'm getting realistic temps 50-70 degrees. Was getting load temps of 30 degrees before. BIOS 1001

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Actually, more testing on my end has shown that CPU speed doesn't affect which ram speeds you can attain. CPU voltage might though. I seem to need 1.3V on the CPU to boot with 2933MHz ram.
 
Has anyone with stability trouble tried running with very relaxed timings? I saw a few people mention on Reddit that trying to run at stock timings was the cause of their issues.
 
Howie87 said:
I seem to need 1.3V on the CPU to boot with 2933MHz ram.
Click to expand...

I can certainly boot with 1.3V on the CPU with 2933MHz RAM, but games will reliably crash after after about 10 minutes. I edged up by .1's and I definitely need 1.35V on the CPU to be stable. With TPU1 and auto volts I was flicking down to about .4 volts with a max of 1.1V. This was stable on the desktop but a stress test crashed me.
Crosshair VI.
 
With the stock cooler I don't really want to go above 1.3V on the CPU as the thermals scare me. This seems to get me to 3600MHz on all cores though.

Bumping the ram voltage from 1.35 to 1.365 seems to have made things more stable for me at 2933MHz but I don't know why Ryzen needs extra voltage to run at lower than the rated 3000MHz.
 
Turns out [email protected] wasn't stable and I still had the occasional boot loop and 'overclocking failed' message so bumped it to 1.37 and it seems solid now. Running stock timings of 15-17-17-35.

CPU @ 1.25V and 3.5GHz on all cores. Maxes out around 70C on prime 95 with the stock cooler.
 
If I just set my ram to 2933 xmp profile without touching vcore or vsoc then it will not get past windows spinning wheel screen.

By upping the soc voltage to 1.12v then it will get into windows no problem, but half the time it will get stuck in boot loop then reverts to 2133 speed.

Later when I start overclocking my CPU and increase the vcore to +0.25 or so (1.43v). it no longer reverts back to 2133 upon boot. Although it still sometimes takes a couple of on-off cycles at start up before it gets to POST screen.

So CPU voltage definitely plays a role.
 
Also, switching core performance boost setting to auto has greatly increased boot success rate for me. Not exactly sure how this all works but performance has not been adversely affected from what I can see.
 
1.35vcore at 3950
1.05soc
1.4ram

3200 profile on 103 BCLK. That works for me with LPX Hynix mem.

I just ordered some G.Skill 3600mhz 2x8 memory from Rainforest, £153. Will do a comparison against my 3200 Corsair and see if it gets me any higher.
 
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opethdisciple said:
As you can imagine all this information is very confusing!

Will the Corsair Vengeance LPX 16GB 3200Mhz work in the Asus Prime X370-Pro?

Also my plan was just to install the ram, and if it doesn't run at 3200Mhz out the box hope that a bios update will unlock it for me in the future.

However the info on the first page makes it sound like I might actually have to manually downclock the ram to get it to work? :confused:
Click to expand...

Yes that will work. DDR4 runs at 2133 by default, anything over that is an overclock. So when you first boot up if you want more than 2133 you have to select it. That said many people are not able to run at the memory's rated speeds atm
 
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