It depends on the frequency of the modules. Mine seem to need 1.45v when set to 6000 MT/s.
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*** AMD "Zen 4" thread (inc AM5/APU discussion) ***
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It depends on the frequency of the modules. Mine seem to need 1.45v when set to 6000 MT/s.
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Ahh, that'll be it then. Mine are 5600Mhz C36 ones, but the CPU has train and clocked them down to 3600Mhz C30 for fully populating them. They're normally 1.25v, but running them at a lower speed has allowed the CPU to set them at 1.1v instead.
Why did you get 5600/36 for 128gb?
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They were the only ones available (in stock) at the time when I got everything else together (missing only RAM).
Not that I mind, if BIOS revisions are supposed to allow higher speeds later on, I can work them up later on as they have headroom (same applies for the max capacity I suppose). If I can't, then I got them running at lower timings at least. But the key thing was to get them as the whole system arrived to build and test for issues (I remember the what I thought was teething issues on my X79 system back 10 years ago was revealed a few months ago to have been actual trouble on the board which I wasn't able to diagnose, so I wanted to avoid a repeat of that and get it all tested out asap after purchase). Thankfully no issues found, other than it cost a tiny bit more than the (current) cheapest DDR5 sets. (They were the cheapest set available too that was available, so not all bad)
Indeed. The JEDEC spec for DDR5 is 4800 MT/s, running at a voltage of 1.1v. So, quite a bit lower than the voltage required for high spec DDR4 modules designed to run at the same frequency.
The bottleneck on faster DDR5 modules is likely to be the voltage. The latest memory chips can handle being run at similar voltages to modules designed to run at 6000 MT/s, but at higher frequencies.
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Just wait for Zen 5 then
My system stability is much better with AGESA 1.0.0.4 (included with ASRock's latest Beta BIOS) + the latest AMD chipset drivers.
Ran my PC in AIDA64 3 times (4 hours each), with CPU at stock, except for a PBO limit of 85 Celsius. No problems
Ran my PC in AIDA64 3 times (4 hours each), with CPU at stock, except for a PBO limit of 85 Celsius. No problems
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I had some issues with getting my AM5 rig to boot with no hickups. Each time I turned XMP on I was getting "disk repair" screen or some random BSOD whilst trying to boot into Windows. Well I have updated firmware on my WD nvme drives and it worked a treat so far. Boot time is still not as super quick as AM4 but yeah I can finally say it works as you would expect from a brand new system.
Overall I'm very impressed how quietly my 7950X is behaving if that makes sense. My first experience with Zen was 5800X back in 2021. This thing would boost into stratosphere with every mouse move or opening a browser etc etc. Don't get me wrong, performance was there but I wasn't impressed in respect of noise/temps during day to day use. Coming from 4 core Intel it was driving me up wall.
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My 7950X ASUS BIOS Prediction:
SP:116,
Cooler:166pts,
V for 5232MHz 1.253V @L5,
Heavy Freq 5232MHz,
V for 4500MHz 0.982V @L5,
Dos Thresh 87
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Oh that is interesting, my Samsung is up to date though.
Carrying on from this; I also found that none of the cores would go above 5.5ghz even when running cinebench single thread test.
Then after googling I found it's cause the latest AGESA has a 5.5ghz limit if 4 or more cores are active at the same time. Which is the case, task manager shows 4/5 cores active with load even just when idling but there isn't any apps that look like cpu hogs so no idea why.
Then found that my board has a medium load boost feature which removed this AMD limit and allows for any core to reach max clocks regardless of load - with that enabled then I had some cores reach 5.8ghz but the problem is now the 7950x is idling at 70c and it's drawing 110w at idle
It seems AMD has turned their latest CPUs into massive power hogs
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You have a 16 core CPU?
Anything over 5.5Ghz seems impressive to me - the boost spec for that CPU is upto 5.7ghz, maybe limit it to that?
You could try reducing the minimum core speeds in the power settings in Windows, hopefully that would reduce power to the cores when idle.
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I have my 7950X at ECO 65W (-5 All Core Curve), idle is ~30-40W and 25-35C (Cold Room, AF 2 360mm cooler). Max boost recorded is 5.775GHz. If you use ECO 105W, you get 95% of the performance with a big drop in power.
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I'll give the Eco modes a try today. I did try the enhancement PBO mode that allows setting target temperatures and got the following in cinebench:
Stock (targets 95c)
CB R23 score: 38k
Temp: 95c
Power Draw: 235w
Target 80c
CB R23 score: 35k
Temp: 80c
Power Draw: 180w
Target 70c
CB R23 score: 33k
Temp: 70c
Power Draw: 150w
ECO 105W gets 36K :140W (temps: 60-75C)
ECO 65W get 29.6K :85-90W(temps:55-65C)
Add -5 curve bumps the score up:~500-1000
Edit:
Just ran CineBench [ECO 65W -5 Curve]:max temp 48C(package) [29271][90.184W]
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I use that as it happens, although would probably make more sense to use eco mode. Much of a muchness I'd imagine.
Has anyone on Zen4 been able to successfully use XMP 3.0 rated DDR5? I understand 6000Mhz is the sweet spot for Zen4 - is the platform happy booting XMP modules and then manually setting the speed and timings etc, or are there compatibility issues doing so?
Cheers
Cheers