Finally: Overclocking EPYC Rome ES

norcimo

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Aug 11, 2020
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If it's anything like the other dual-socket boards I've used, it will boot with as little as 1 DIMM in CPU1 A1.
Rome is fortunately a internally symmetric design - unlike Naples, populating half the channels will not cause anomalous drops in performance.
Is it safe to assume populating all will render the best performance in your judgement (8 channel)? taking into consideration its for mining. Try to avoid spending money on memory I wont benefit from...
 

alex_stief

Active Member
May 31, 2016
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Judging by the mining performance characteristic of Zen1 Epyc: you can probably get away with 4 DIMMs per CPU with a very minor performance impact. But you probably have to put the CPUs into NPS4 mode for lower latency, and split/pin workers accordingly. The latter will be necessary anyway, due to segmented L3 caches.
 

Spartus

Active Member
Mar 28, 2012
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I dont think Monero will benefit from RAM channels at all. I thought it was entirely designed about running tables in L3 cache.

A lot of the inconsistency in my setup has disappeared since lowering the clocks. 3.45 GHz was causing situations where there was massive coil whine and poor performance to randomly appear. It was like it was jumping from 1 ghz to 3.45 at high frequency causing high frequency current changes (hence the whine). almost like the clock speed took but the wattage limit wasn't, or some safety feature was kicking in to clock it down.

Anyways just fyi if anyone else is having problems with "stable" overclocks. ZS series chips on H11DSI board.
 

ari2asem

Active Member
Dec 26, 2018
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The Netherlands, Groningen
Random X coins, monero and alike.

At this time, can the system be booted with 4 16gb sticks, one on each bank? I need to test the CPUS. as the rest of the components come.
for monero you don't need big size ram stick. if you mine only with cpu, you can go with 32gb of totall memory, this is more than enough.
if you are going to mine with cpu and gpu, you need per gpu 2gb extra ram memory
 

norcimo

Member
Aug 11, 2020
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yes it does(i have that exact setup) but dont expect big overclocks, the 53-04 already runs close to stock speeds and the motherboard vrm seems to be the limiting factor.
HI. As I wait for the parts, you said the REV 2 of the MB will support ES 100-000000053-04 , as you have the same setup.. Did you have to do anything to the BIOS? example update the bios?

Also, it seems I cant find any more ES 100-000000053-04, is it safe to assuming the same with the ES 7702 2S1404E2VJUG5 ?

Thank you for your time.
 

mirrormax

Member
Apr 10, 2020
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no the jug5 cpus are different, you cant match them together, and afaik you need 2 cpus to boot with these ES/qs/oem 64cores.
didnt have to do anything with bios except update to 2.1 if you want nvme oculink support
 

norcimo

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Aug 11, 2020
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no the jug5 cpus are different, you cant match them together, and afaik you need 2 cpus to boot with these ES/qs/oem 64cores.
didnt have to do anything with bios except update to 2.1 if you want nvme oculink support
Sorry i was not clear I have 2 cpus of the other... This is for a separate system im building.. ES 7702 2S1404E2VJUG5 just want to make sure it will work with the REV 2 mB, before I buy it...
 

bayleyw

Member
Jan 8, 2014
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Word of caution: judging from previous folks' experiences with the 2S1404 CPU's on this thread they are much more temperamental than the ZS1406's - your clocks will be tangibly lower. For reference I paid $800 for my ZS1406, and they were available for as low as $600, so I'd not pay too much for the 2S1404's.
 
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norcimo

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Aug 11, 2020
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Word of caution: judging from previous folks' experiences with the 2S1404 CPU's on this thread they are much more temperamental than the ZS1406's - your clocks will be tangibly lower. For reference I paid $800 for my ZS1406, and they were available for as low as $600, so I'd not pay too much for the 2S1404's.
Isnt the ZA1406 base clocked at 1.4ghz? 2S1404 the same also?
 

bayleyw

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Jan 8, 2014
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Isnt the ZA1406 base clocked at 1.4ghz? 2S1404 the same also?
AMD ships their engineering samples at very low clocks; I am pretty sure the method folks are using to overclock them is intended for clock tuning 'in the field' as they qualify their parts. The ZS is a newer stepping (and likely a newer variant of TSMC 7 nm) with better voltage scaling and more clock headroom. Even so, they are worse than the release parts - my ZS1406 can just about match a 7702 before the limiters start kicking in, whereas the 7742 clocks a bit higher and Threadripper lives in a world of its own.

I'm also inclined to believe the limiter is not entirely VRM-driven; if I disable HT, I can hit 3.2 GHz on all 64 cores in Cinebench and just about match 2.5 GHz + HT, but the chip draws horrifying amounts of power. It's an interesting tradeoff, if I had water on the VRM's I'd run at 3.2 GHz and get my good single thread performance without losing multithreaded performance, but with just air I don't think the VRM's can sustain it.
 
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norcimo

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Aug 11, 2020
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AMD ships their engineering samples at very low clocks; I am pretty sure the method folks are using to overclock them is intended for clock tuning 'in the field' as they qualify their parts. The ZS is a newer stepping (and likely a newer variant of TSMC 7 nm) with better voltage scaling and more clock headroom. Even so, they are worse than the release parts - my ZS1406 can just about match a 7702 before the limiters start kicking in, whereas the 7742 clocks a bit higher and Threadripper lives in a world of its own.

I'm also inclined to believe the limiter is not entirely VRM-driven; if I disable HT, I can hit 3.2 GHz on all 64 cores in Cinebench and just about match 2.5 GHz + HT, but the chip draws horrifying amounts of power. It's an interesting tradeoff, if I had water on the VRM's I'd run at 3.2 GHz and get my good single thread performance without losing multithreaded performance, but with just air I don't think the VRM's can sustain it.
Interesting. I'm going to wait a little and get the funds for the second build. im not going to consider ZS1406.. i'll save and get ES 100-000000053-04 as before. I
 

norcimo

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Aug 11, 2020
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Anyone knows where I can buy a pair of AMD EPYC 7742 64-Core ES 100-000000053-04 besides Ebay? Good price?
 

norcimo

Member
Aug 11, 2020
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Got the system today, but it reboots randomly can finish the installation....sucks!

02/21/2020 2.1 BIOS, DUAL ES 100-000000053-04 , 64 GIG 4 sticks on slots 1 of each...any help?
 

norcimo

Member
Aug 11, 2020
40
1
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Got the system today, but it reboots randomly can finish the installation....sucks!

02/21/2020 2.1 BIOS, DUAL ES 100-000000053-04 , 64 GIG 4 sticks on slots 1 of each...any help?
I put the four memory sticks in the last slot of every bank (1 each)), seems to work better, windows 10 going through its install, reboot 2 twice.
 

ari2asem

Active Member
Dec 26, 2018
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The Netherlands, Groningen
Hello, can anyone share how do you cool VRM and CPUs, qnd what clock/voltage are you using?

zoom in to see the small fans between cpu coolers. 2 small fans (40*40*10mm) between cpu coolers, on cooling block of VRM.


notice push-pull setup of cpu coolers, the white fans are more powerfull (around 75-80 CFM) than noctua fans (both are 120mm fans).

with this build as you see, i am running mining with 252 threads.
cpu-temp: max 67-68 °C
vrm-temp: max 82-83 °C
bios: untouched, unmodded, original, tweaks: TDP and PPT set to 180 watt


when i run monero with 16 dimms i get around 74-75 kh/s.
when run monero with 8 dimms i get around
33-34 kh/s

so, the count of dimms has big impact on monero (note: not the size of dimms, but the amount of dimms)