G.Skill Ripjaws V DDR4 2666Mhz, won't boot unless it's at 2133Mhz

Niskii

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Oct 6, 2015
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So I'm using an Asus prime X370 pro mobo.

I've noticed my ram was running at 2133Mhz, So I tried to get the X.M.P profile for 2666mhz to boot, No luck at all, giving the memory more voltage, loosening the timings nothing seems to have worked. So I'm kinda curious, has anyone else encountered this problem? I know people are failing to boot with 3200Mhz kits, yet they achieve 3000Mhz keeping their timings tighter.

I suspect this must be something to do with the IMC and AMD shipping out the new instructions. I've read in some places that it undid a lot of work that was done by companies in improving memory compatibility.

Oh yeah, it's also worth nothing my CPU is at it's stock settings so I haven't pushed the CPU far enough to mess with the ram.
 

Seanie280672

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Mar 19, 2017
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2,960


Is your bios upto date ?, thats the first step to try.

Try manually setting speed, leave timings on auto, set voltage to whatever the voltage is on the side of the sticks, probably 1.35v, start at 2400mhz and work up from there.

Also setting SoC voltage to 1.100v helps a lot, stock volatge for this is around 0.900v, max is 1.2v but you shouldnt need that high.
 

Niskii

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Oct 6, 2015
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Running your settings it'll boot at 2400mhz instead of 2133 but no furtherz

The stock timings are 15-15-15-35 @ 1.350v

I've tried 16-16-16-38 @ 1.375V

and tried bumping the SOCC voltage to 1.1250

I'm not really sure what more I can do, also yeah the bios is updated to the latest version, I believe that it's 0604 or something along those lines.
 

Seanie280672

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Mar 19, 2017
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2,960


If you download Thaiphoon burner, http://www.softnology.biz/files.html get the free edition and launch it, it will scan the sticks of ram, could you tell me what memeory chips it comes with or post a picture of the result here, this is mine.

34teq9v.jpg


Mine are G.skill Trident Z RGB 3200mhz, running at 3200mhz 16-18-18-38-1T Hynix chips.

38w1l.jpg



 

Niskii

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Oct 6, 2015
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I've managed to tighten to timings at 2400Mhz to 13-13-13-35. So I guess that's an improvement over previous efforts. Here's the image anyways :)

Thanks for the input btw, I'm actually learning a lot out of this.

2donk5.jpg
 

Seanie280672

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Mar 19, 2017
1,958
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2,960



You're running Hynix too, some people have success, other dont, I do know that AMD are working on there next AGESA update, which they are hoping to address Hynix ram issues and get max supported ram speeds upto 3600mhz, its due sometime in May, we should all see it in our next bios updates, and hopfully, if all goes well, get our memory running at full speed.
 

Niskii

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I may just have to wait 'till May as you say. I might even get lucky enough to get well beyond 2666Mhz. Fingers crossed :D
 

Seanie280672

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Mar 19, 2017
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Yup, easily, just loosen the timings for each 200mhz, to be honest, with the timings your running now, CL13 2400mhz, is probably faster than 2666mhz CL15.

so mine, 3200mhz CL16 should do 3400mhz CL17, 3600mhz CL18, thats the highest ive seen this particular kit run.

 

Niskii

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Oct 6, 2015
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Well yeah that's what I was thinking too, CL13 is pretty quick. Have you tried running at 3600Mhz? Or have you not bothered?
 

Seanie280672

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Mar 19, 2017
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CL13 is very quick.
My board wont allow over 3200mhz at the moment, im hoping the next bios update will open that up further.
 

Niskii

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Oct 6, 2015
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Good point I didn't remember that all boards really only support up to 3200Mhz at the moment.

I suppose the next task is to OC my CPU, hopefully it won't get upset over my RAM
 

Seanie280672

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Mar 19, 2017
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Thats where that bump in soc voltage helps.

Which CPU did you get and which cooler are you using ?

 

Niskii

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Oct 6, 2015
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I did some messing around the other day and had 3.9Ghz @ 1.4V, it was stable but I've decided to dial it back to 3.8Ghz on 1.35V which seems to be rock solid, but I'll find out over night, currently I have an H100i and R5 1600
 

Seanie280672

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Mar 19, 2017
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AMD currently say 1.425v max for 24/7 use, but at the end of the day, it depends on your temps: fast forward to 3mins 50secs to skip the rubbish part: https://www.youtube.com/watch?v=vZgpHTaQ10k&feature=youtu.be this guy also mentions the May update from AMD to help Hynix chips along.

 

Niskii

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The hottest it's ever ran was 64C in a closed room @ 1.42V at 3.9Ghz, that temperature peaked at around the 2 hour mark. I tried to push 4.0 on it but it just couldn't do it. Hence I decided to ran 3.8ghz and take the voltage down, I could probably get it lower, but it currently runs around 55-58C max, which is cool enough for me. Coming from an FX 8320 it's like sitting next to a freezer in comparison.
 

Seanie280672

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Mar 19, 2017
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Mines the same, I have an R7 1700 running at 3.9ghz 1.375v, I can get it to 4ghz but I need 1.43v to keep it stable, the extra heat and extra voltage is just not worth it for 100mhz more, my idle temps are in the high 20s and fully load stress test is anywhere between 58oC and 63oC, water cooling mine.