Is 128GB of DDR5 IMPOSSIBLE on AM5? Level1 Investigates!

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[ActuallyHardcoreOverclocking]

AIDA's memory test has a tendency to hit the L3 cache during the "RAM tests"

Also you can literally calculate max memory bandwidth. DDR5-4000 has a max bandwidth of 64GB/s. DDR5-6000 can't do more than 96GB/s

[marcogenovesi]

Amazing, now server-grade boot times are a reality for desktop.

[sudpud]

GLAD someone is talking about this! There are a lot people wondering why their 4 slot memory config can't run DDR5-6000 on AM5.

[bjn]

3:00 I've experienced this on countless DDR4 boards in the last few years, _especially_ in the ITX space. Have to not only push down, but help it in place by pushing the latch closed.

[MaheerKibria]

Gskill's SKU makes sense and instantly tells you a lot about the product. F5 means DDR5, 6000 is the rated speed. 3040 is the first two cas latencies of 30 and 40 32gx2 tells me that it is 2 stick of 32 GB stick Tz5n means it is trident z with Expo profieles where as TZ5 whithout N means it is XMP profiles. The lack of a K or S means it only comes in one color way

[mattshortland]

Running a VFIO setup on Ryzen 7000 with the iGPU as my linux display out and 128GB. 4200 stable is the most I can get with my RAM (corsair non EXPO kit). The newest UEFI really helped stability with my MSI board. There's a long way to go. Thanks for putting in the work Wendall, keep fighting the good fight!

[Alkaris]

They really should reinforce the RAM slots and make it so RAM sticks can properly insert themselves into the slot without having some janky thing where it doesn't fully click into place. When inserting RAM you're putting a lot of pressure on the slot and RAM sticks, which feels like it's gonna break.

[shadowheart]

Good thing I bought a single dual stick kit of 64gb 6000mhz for my steel legend, as opposed to two.
Phew. Thank you Wendell, answering a burning question I've had for the last few days. ❤️

[Bayonet]

I'm hoping that Zen 4 with 3D cache will, as the 5800X3D did, ameliorate the performance impact of slower memory, and thus allow for highly performant quad rank setups.

[pbd]

you just saved my sanity with this video... as it has been a few years since i last built a machine, i would never have expected the limitations we currently face with 4 DIMMs. 10minute Boot times? No freaking way... but yet, here we are.

Got my 128GB to run at 3800MHz, will have to see if its stable though.

[devemia]

The content I have been waiting for. I always want to see how far can these platforms go with extreme memory size. Finger cross and see if Buildzoid will also test 128GB on AM5.

[Yock]

AMD and Intel really don't want you to use consumer chips for workstation work any more.

[joshxwho]

This is a great video! Thank you for talking about this, and for talking about the ddr5 inserting issues.

[johnscaramis]

I think 128GB support needs time to mature. In the end we're talking about consumer boards and board manufacturers will test RAM and optimize UEFI settings for the memory configurations which are around the sweetspot for consumers, so 16GB or 32GB in total.
And Intel has the 2nd gen CPUs with DDR5, so it can be assumed that they have improved the IMC in Raptor Lake compared to Alder Lake. If I remember correctly, early adopters had also issues with DDR5 compatibility.
So let's wait and see what AGESA and UEFI updates bring in the future.

[jjdawg]

Thanks for addressing the 13900K since that would have been the next question. It can't remember a time when the memory technology was that far ahead of the memory-controller technology and this is Intel's 2nd round.

[michaeleber]

Wonderful presentation. This is the first video of yours I've watched and it is a breath of fresh air. I've seen way too many channels where the speaker has no script, has not idea what they will say, and half of their presentation is them correcting themselves or not saying anything at all.

[simonthibodeau]

I'm currently running 128gb DDR5 at 4600mt/s with my 7950x. They are two 2x32gb kits of corsair CMK64GX5M2B5200Z40 (5200 mts c40). Those kits were pretty cheap compared to most lately and probably still are today.

That's the max I was able to run them on both an Asus proart creator wifi x670e board and an asus prime x670e pro wifi board. Both running at docp profile 1 and setting the target frequency to 4600 (no other tinkering, using the latest bios which you do need to update!). Above that it won't boot.

Not officially supported but I think its the most bang for the buck 128gb configuration I could find. Hopefully this info can help some people. Maybe I could manually OC to squeeze a bit more but I've read of instability issues so I don't bother with it.

I might upgrade in the future when true 4 stick kits become supported, available and affordable. Imo buying more expensive ram than my config is just not worth it as it's pretty clear something much better will come along eventually and you're gonna need to upgrade anyway, even if you splurge for the higher end ones now. I kinda also doubt the current kits will get that much better support through bios updates as many manual OCers have tried their best to push them to their limits in 128gb configurations with no success. I don't think a docp profile that actually can get them to their rated max speed is even possible.

Thanks for this great video. Wish this video was available when I made my build, it would've saved me a ton of digging in forum, trial and error buying the wrong things, and tinkering around in the settings. I'm sure it'll help out a lot of people.

Ps: my boot times are very fast now, once the first boot was completed. The memory training time on first boot is always very long, and annoying since you never know if it will eventually succeed or not. If you follow my config you should have no problem matching my results easily and get a very usable working 128gb setup at a somewhat decent speed. Cheers y'all!

Pps: heard the expo version of my kits currently have a bunch of issues, my local shop has stopped carrying them. I recommend you get the regular xmp version like me.

[YesterGearPCii]

Recently I built a 7950 system (Asus x670e ROG Crosshair Extreme) for a deep pockets client. He ordered 128gb of Corsair Dominator Platinum RGB 5200.

With all 4 sticks, it would never run more than 3600mt/s, and took 20+ minutes to train/post.

With just two sticks, it would hit 4800mt/s (still not the 5200 advertised), and enabling manual DOCP would refuse to post even after an hour of training.

We were both a bit confused and upset. He currently decided to stick to the 64gb.

[ahuesphoto]

The video is interesting, this “next room approach” is actually practical in most homes. I used to think that water cooling was a necessity for a Silent Gaming PC / Workstation until I tried positive air pressure (inside the case). With positive air pressure and enough high-quality fans in the proper orientation and a good enough case you can enjoy a silent PC with near water cooling temps (less than 60 Celsius under load). I use Arctic 120mm fans, they won’t go above 1000rpm often, and they are not expensive like Noctua fans. In my personal experience the Best orientation for air is top to bottom with PSU fan facing inside the case (as exhaust fan), and front to back with a WS case (with 3 front fans). Even blower style GPUs get cooled efficiently because of the fresh air being pushed / moved constantly inside the case. The key is to have more / faster intake fans, and less / slower exhaust fans, and not to have conflicting / opposing airflow; this way the air moves quickly and the fans don’t have to spin up to higher RPMs.

[porkbork]

Wish I saw this video first before buying 2 pairs of Corsair Vengence 5200mhz kits for 128gb total. Luckily I didn't buy high end ones, which would have wasted the chip speeds. On my MSI PRO X670-P WIFI with 7950x I was able to get a stable 4600mhz - it passed two PassMark memory test runs. 4800mhz posts and boots, but fails memory test. 5000 and over does not post and need a CMOS reset (or take out two of the chips to boot and change bios settings)