Ryzen 9 9950X with 4×32GB RAM

[igormp]

Based on AMD's specs, if you populate 4 dimms, it only supports 3600MT/s

Yeah, but XMP is a thing. Max speed for even 2 sticks is still 5600MHz for 9000 series, and then you go and enable XMP on top of that (at your own risk, ofc).

 

[ir_cow]

Based on AMD's specs, if you populate 4 dimms, it only supports 3600MT/s

Yes. If you ask AMD for tech support and your running above 5600 with 2 DIMMs, they will tell you buy different memory. What AMD officially supports and what is generally works with 99% of the CPUs is different. The official rating is mainly for motherboard manufacturers I think. Otherwise budget motherboards couldn't exist without it being the wild West for memory support.

 

[gasolin]

You wont be able to go near 6000 with 4sticks let alone above.

JayTwoCents couldn't get his ram to run at 6000

 

[ir_cow]

JayTwoCents couldn't get his ram to run at 6000

Jay is also YouTuber that doesn't know how troubleshoot at all.

 

[Braegnok]

Running 4X32Gb on AM5 you might be better off with a very tight 4400MTs CL24 profile, running MCLK 2200, FCLK 2200, UCLK 2200.

vs trying to get above 5600 stable.

 

[A Computer Guy]

Jay is also YouTuber that doesn't know how troubleshoot at all.

Jay makes the mistakes and films them so we don't have to.

 

[ir_cow]

Jay makes the mistakes and films them so we don't have to.

Yes, I would consider him the average plug and play consumer. Doesn't know when its wrong and also gives up too easily.

 

[R-T-B]

Jay is also YouTuber that doesn't know how troubleshoot at all.

Hard agree. My 9950x is running at 6000 with 4 sticks just fine. See specs.

 

[gasolin]

Hard agree. My 9950x is running at 6000 with 4 sticks just fine. See specs.

Mabye it's harder to get 4 ram sticks to run at 6000 with a 7950X3D

 

[Toothless]

Mabye it's harder to get 4 ram sticks to run at 6000 with a 7950X3D

Pretty sure same I/O die and memory controller.

 

[Super Firm Tofu]

Pretty sure same I/O die and memory controller.

And if I remember correctly, Señor Frog was running the same four sticks on his 7950x.

 

[igormp]

Hard agree. My 9950x is running at 6000 with 4 sticks just fine. See specs.

Going back to the original point of the topic, yours is "just" 64GB total, and not 128GB, which is (supposedly) way harder to achieve higher freqs.

 

[lexluthermiester]

What are the experiences with 9950X (or 9900X/7950X/7900X) with 4 installed memory modules?
Or should I go with 2×48GB over the 4×32GB?

I haven't seen any issues with 4x16GB so 4x32GB should work just fine.

Jay is also YouTuber that doesn't know how troubleshoot at all.

That is not at all correct. He's not perfect but he's not incompetent either.

 

[ir_cow]

I haven't seen any issues with 4x16GB so 4x32GB should work just fine.

eh.. 4x32GB is going to be a hard to pull off at 6000. You could always set it to 2:1 ratio (ULCK/MLCK/2) , but why? Just leave it at 4800 instead.

 

[lexluthermiester]

4x32GB is going to be a hard to pull off at 6000.

Not really. If one buys two identical 64GB kits, they should work fine. The RAM training takes a while, but otherwise they should be ok.

For example, these work every time,
https://www.newegg.com/corsair-64gb/p/N82E16820982099

 

[csendesmark]

The RAM training takes a while

Sorry, what is this RAM training?
Finding the ideal timing values with finetuning?

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Looks great, except the high profile of the heatsink.
But I think I will take the 2×48GB route.

 

[eidairaman1]

Not really. If one buys two identical 64GB kits, they should work fine. The RAM training takes a while, but otherwise they should work fine.

For example, these work every time,
https://www.newegg.com/corsair-64gb/p/N82E16820982099

Thinking about it the very first boot of my rig in 2014 did the same, at first I thought it failed but I left it alone and it booted up.

 

[lexluthermiester]

But I think I will take the 2×48GB route.

Fair enough. 96GB of RAM is a lot! Unless you need more, that much should last you the life of that system.

Sorry, what is this RAM training?

It's something the newest generations of AMD & Intel CPU's do when a BIOS detects a change in RAM. The BIOS(UEFI) runs through a series of tests to check the parameters and specifications of the of the installed RAM to ensure stability. The more you have installed the longer it will take but it shouldn't take more than 2 or 3 minutes at the most for the 96GB you're planning. The system will automatically reboot a number of times during that process.

 

[ir_cow]

Not really. If one buys two identical 64GB kits, they should work fine. The RAM training takes a while, but otherwise they should be ok.

I think your missing the reason why there is a problem running 6000 4x dual-rank 1:1 and why it is not a great idea from a stability standpoint. Time to go back to Ryzen basics 101 and study up

 

[AleXXX666]

Hello All

Most likely I will get the Zen5 9950X, which has dual channel memory controller (wish I could afford the 7960X for the sweet 4 channel MC).
My question is:
What are the experiences with 9950X (or 9900X/7950X/7900X) with 4 installed memory modules?
Or should I go with 2×48GB over the 4×32GB?
View attachment 359549

I am not very "Einstein" in math, but I think that 2x48 is < than 4x32. 2x64, maybe? If you understand that 2x48 is ENOUGH, why not use that "modern comfort" option? I am OK with 24 GB but f**k I need to pay for 2x16 because 2x12 isn't available, but I think it kindda "makes sense" to replace smallest 8 GB for 12 GB modules...

 

[dj-electric]

64GB DIMMs are a bit late to the domestic market but *should* arrive sometime soon to solve memory hungry needs of dual channel users.

I'm also not having the best of luck booting my 9950X with four DIMMs at any respectable speed

 

[dgianstefani]

Pretty sure same I/O die and memory controller.

X3D has lower voltage caps.

 

[Sarajiel]

Running 4X32Gb on AM5 you might be better off with a very tight 4400MTs CL24 profile, running MCLK 2200, FCLK 2200, UCLK 2200.

As mentioned before, 2800; 2100; 2800 should work as well on 8-layer PCBs, and would be much faster than a 4400MT/s setup.

Right now, I'm on the road, but once I'm back next week, I'll try to test 128GB with a fresh 7950X3D and a new B650E Aorus Master board.

Sorry, what is this RAM training?
Finding the ideal timing values with finetuning?

No, it doesn't fine tune or auto-detect any of your timings. It's a way more low level process that is required to ensure proper communications between your memory controller and the memory chips on an electrical level.
I'm not good enough at electrical engineering to explain it properly or in depth, but to put it simply, the memory controller inside your CPU writes and reads data-patterns to the memory chips repeatedly and adjusts the electrical signals accordingly to ensure signal integrity. Therefore, if you change the memory setup by adding or removing sticks, or change the frequency of the memory, you have to retrain. If you run very aggressive overclocks, you can even adjust training parameters to ensure better stability. However, training will take ages then.

It's something the newest generations of AMD & Intel CPU's do

It's also done for DDR4, but most folks won't notice it, because the training requirements aren't as stringent as DDR5. For example, after clear CMOS, training 128GB with one of my 5950X's takes about 10 seconds, 128GB with one of my 7950X's takes between 150 and 300 seconds depending on the motherboard and AGESA version.
Most DDR4 boards also default to memory context restore automatically, which makes consecutive reboots almost instantly. If your motherboard has a post-code display, it's easy to follow.

Mabye it's harder to get 4 ram sticks to run at 6000 with a 7950X3D

X3D has lower voltage caps.

There is a rumor, or more a suspicion, that at least early X3D chips have a lower binned I/O die. I don't know if it's true or not, but I've seen multiple claims on forums that X3D's seem to be weaker in the memory department. I think, even that Buildzoid guy mentioned the suspicion in one of his rambling videos. Unlike Mr. $0.02, he seems to know a thing or two about memory overclocking.

My 1st 7950X3D has a manufacturing date around May '23 and has a worse memory controller than my 7950X from Aug. '23 and my 7700 from Nov. '22 (not a typo, it was manufactured really that early). I got another 7950X3D last Friday, that was manufactured Jan. '24. I'll probably have enough time to test the CPU a bit with 4x 32GB and maybe even 4x 48GB before building the new system. Personally, I'm really curious about the memory OC possibilities of that one.

Generally speaking, the most important voltage for memory overclocks of the AM5 memory controllers is VSOC. Both regular and X3D CPUs are capped at 1.3V to my knowledge. Most motherboard BIOSes with AGESA 1.1 and later seem to default to 1.2V or 1.25V. Gigabyte is also quite sneaky and set the cap twice in their BIOS GUIs to make it harder for people to accidentally increase it.

VDDIO, VDDQ and VDD aren't capped, as far as I know, and you can happily fry your memory sticks, if you chose to do so. I think you have to stay below 1.8V for VDD or the system won't POST, but I'm sure that some BIOSes allow values above that.
VDDIO and VDDQ have a very pronounced sweet spot effect for quad-rank setups, and vastly differ between board manufacturers. On my Gigabyte boards it seems to be 1.25V for both, but for my MSI one I gave up and just switched back to 96GB, because 128GB at 4800MT/s was the only speed that was stable and easy to tune. My only Asus is a 2 DIMM board.

Adjusting VDDP and VDDGs is also possible, but I wouldn't touch them for daily setups, mainly because it's extremely annoying to test them for stability unless you connect an oscilloscope to your board.

 

[lexluthermiester]

I think your missing the reason why there is a problem running 6000 4x dual-rank 1:1 and why it is not a great idea from a stability standpoint. Time to go back to Ryzen basics 101 and study up

No need, experience prevails. I have experienced zero problems running 4 DIMMs on Ryzen, regardless of rank. Now granted, I've only done installs with 4x16GB sticks, so there might be a difference with 32GB DIMMs, but I doubt it.

However, the OP has made their choice clear, and that makes our discussion mute, so I digress.

 

[gasolin]

So how about just using the qvl list to use 4 ram stick, problem solved