Advice on Max safe voltage on Mem

[EL_JOCK]

Hi all,

Built my Ryzen system last week and been tinkering away with it to get the best speeds I can, but I seem to have hit a wall trying to get to 3200 on the mem.

I have the following kit, Gigabyte x370 Gaming 5 on the F6 bios, 1600 Ryzen and Gskill F4-3600C16D -16GTZR, the memory is Samsung b die, single rank.

I'm able to get the CPU to 3.8 & 3.9 no problem, Mem at [email protected] with fast timings again no problem.

Going for 3200 i need to put 1.45v with auto timings (slack) just to get some sort of boot that's not F9 errors and a reset to 2100, but that lasts less than 10 minutes on Aida64 stability test before a fail. I watched the Robert Hallock video and he said you could go to 1.5v on mem, which seemed high but i gave it a go, booted OK, i stopped it at 20 minutes, to check in with you fine peeps but it was running fine on Aida64.

Clearly the more volts on the memory is helping, but as title say's what can i go to before i need to stop? or is even 1.5 to much?

Thanks in advance

 

[8 Pack]

Your fine upto 1.55 mate. No problem.

 

[Ste]

Yeah you shouldn't be needing that voltage for 3200 with that setup though. What are the timings?

I have worse mem than you (the 3600c17 version) and it's doing 3333 at 14-14-14-32-54 at 2T 1.4v or 14-14-14-38-60 at 1T 1.45v.

Put a little into the SOC voltage, 1.15 is fine and can lower once stable. Check tRFC isn't too tight (312 is doable 333 easier) also.

Finally F9 codes can be helped along with 60ohm procODT.

 

[EL_JOCK]

cheers 8 pack and Ste,

will look to pull back some of the timings and test again, but good to know the safe voltage level, did not want to kill the ram. I think they were at 16-16-16-36-52 on auto put will have a look, have a tinker with it and post once i have more details.

Thanks again, this is why OcUk is the best

 

[EL_JOCK]

Bit of an update,

So i went back to basics loaded the default settings back into the bios to remove any numbers i might of punched in that might be giving me an issue, CPU now at stock etc.

Put the SOC @ 1.15v & Ram @ 1.45v and changed the mem clock to 3200 (all other settings on auto, which turned out these key numbers below)

16 tcl
16 trcdwr
16 trcdrd
16 trp
36 tras
75 trc
34 Tfaw
24 Twr
512 trfc
6 trdrdscl
6 twrwrscl
Gear-down enabled

I turned on these
60ohms
1T

Well good things no F9 boot errors, ran Aida64 stability test for an hour no issues ( i know this is not classed as 100% stable), but it would crash in less than 10 minutes before, so a good base to work off but clearly timings etc need some work.....Now the bad

I can change trfc (auto 512) to 333 and its fine, but anything below that, stability fail in less than 10 mintues, if i change any other number to lower than above auto settings its a fail. The odd thing is, if i punch any of the above auto numbers in e.g TRC 75 on auto, but i put in 75 manually it fails.

I'm starting to think that Gigabyte need a few bios updates to iron more bugs out. As a side note, if i manually put CPU voltage in it locks the clock to 15.5x, if i offset the voltage its fine, even if i offset to the same manual voltage number, clearly issues with the bios.

So I'm going to leave it for now until the next bios update or its going to drive me crazy, cannot moan to much currently have the following settings stable @2hrs Aida64 and 500% on memtest.

CPU 3.8@ 1.33v
SOC 1.1v
Ram 1.35v
Mem Clock 2933
14 tcl
14 trcdwr
14 trcdrd
14 trp
28 tras
42 trc
36 Tfaw
10 Twr
256 trfc
2 trdrdscl
2 twrwrscl

Gear-down disabled
60ohms
1T

Again thanks for your help 8Pack and Ste, Overall the system so far is much better than my i5 ivy bridge and it can only get better

Take it easy

 

[Ste]

Good news! Those 2933 timings are very tight so if you do get stuck there at least you're going to get good performance from it.

Very interested in your findings on typing in auto vs. leaving it at standard. Might have a play myself. I get F9 bootloops all over the place when trying to get 3466 which I'd love to get over but do think the gigabyte BIOS is a bit behind the CH6.

 

[EL_JOCK]

Yeah, been playing with it some more today and i'm left thinking its just the bios needs more work, its vexing as on paper this system should crush it. There are a number of odd things that clearly need addressing and it feels more magic than science at the mo.

Hopefully a new update will resolve things, it's just seems odd that my setup can be this good at 2933 but on 3200 its a total washout.

 

[Ste]

Had another go a 3466 this morning before work and no consistent way to get 3466 to boot without F9 issues. It may just be an IMC limit in both cases although failing 3200 is quite rare it seems.

You tried any CLDO_VDDP tweaks? Apparently setting 956mV can help with memory holes.

 

[djbully]

You could try 1.1v or up to 1.2v VDDP in tweakers paradise (if you're on C6H). Also ProcODT can try 80-96ohms see if that helps. Can also try SOC voltage up to 1.2, shouldn't need more than 1.15 though tbh.

 

[EL_JOCK]

You could try 1.1v or up to 1.2v VDDP.

Is that the CPU VDDP?, on auto its 0.9v on the gaming 5

 

[EL_JOCK]

Had another go a 3466 this morning before work and no consistent way to get 3466 to boot without F9 issues. It may just be an IMC limit in both cases although failing 3200 is quite rare it seems.

You tried any CLDO_VDDP tweaks? Apparently setting 956mV can help with memory holes.

Unlucky on the 3466 runs, it could be IMC for my 3200 runs but will have a look at the CLDO_VDDP had seen stuff on this setting and lowering it can help make it stable think the video i saw on it, said use a range of 945-975. do you have gear down on or off, what about bank group swap? from what i read it appears its best to have both off but harder to get stable.

 

[djbully]

Is that the CPU VDDP?, on auto its 0.9v on the gaming 5

Yes I believe it is. It's 0.9 default on c6h. I found increasing that to around 1.1 gave me extra stability, I.e no errors in hci

 

[EL_JOCK]

Yes I believe it is. It's 0.9 default on c6h. I found increasing that to around 1.1 gave me extra stability, I.e no errors in hci

cool will test it out once the next tests start to fail, going a snail pace at the mo to find when my issues happen

 

[Ste]

Unlucky on the 3466 runs, it could be IMC for my 3200 runs but will have a look at the CLDO_VDDP had seen stuff on this setting and lowering it can help make it stable think the video i saw on it, said use a range of 945-975. do you have gear down on or off, what about bank group swap? from what i read it appears its best to have both off but harder to get stable.

Geardown is off though doesn't do anything at 1T. It's complicated but effectively 2T + GDME = 1.5T. BGS also off though didn't know that hit stability.

My biggest problem is booting consistently at 3466. No issues at 3333, have you tried that btw in case you have a 3200 mem hole?

 

[Ste]

CPU VDDP to 1.1 hasn't helped me pass the F9 issue at 3466 either. I dont think it's going to be viable, ah well

 

[Ste]

Just had success at 3466 14-14-14-14-38-54-356 at 1T. 1000% HCI stable when I checked it at lunchtime.

1.175v SOC and 1.45v RAM but I upped DRAM termination from 0.6 to 0.75 which seems to have made the difference

Not free from F9 codes so now need to move CLDO VDPP around a bit to try and find a sweet spot.

 

[8 Pack]

Try ProcODT tuning for F9 codes.

 

[Ste]

Try ProcODT tuning for F9 codes.

Cheers will do. It's on 60 at the moment which has been spot on for 3333 but perhaps the optimal varies with frequencies. Also think there might be a memory hole somewhere.

BTW tomb raider 720p bench is up from 138 to 151 avg FPS between 3333 and 3466. Crazy scaling on mem frequency with ryzen.

 

[8 Pack]

Yeah its the cache your pushing too which explains the efficiency gains.

 

[EL_JOCK]

Cheers will do. It's on 60 at the moment which has been spot on for 3333 but perhaps the optimal varies with frequencies. Also think there might be a memory hole somewhere.

BTW tomb raider 720p bench is up from 138 to 151 avg FPS between 3333 and 3466. Crazy scaling on mem frequency with ryzen.

Glad your almost getting it, gives me hope one day i will get it over the line on 3200. Each time i read this thread i spend a few hours trying to get it to work, but no luck so far have tried everything people have said but its getting so far away from normal operation that i think there is more to it than a setting i can bump up or change, have been spending time getting 2933 as super tight as i can, so its not been a total waste of time