AMD's Ryzen 9 9950X3D2 Dual Edition crams 208MB of cache into a single chip
arstechnica.com308 points by zdw 2 days ago
308 points by zdw 2 days ago
Probably fun for those who already bought DDR5 memory... still kicking myself for not just pulling the trigger on that 128GB dual stick kit I looked at for $600 back in September. Now it's listed at $4k...
Meanwhile I hope my AM4 will chug along a few more years.
> Now it's listed at $4k...
You can buy 128GB of DDR5-6000 with a 9950X3D (not this newest X2 version, but still a $699 CPU) and a motherboard and a case for $2800 right now: https://www.newegg.com/Product/ComboDealDetails?ItemList=Com...
If you don't need 128GB, there are quality 64GB kits for under $700 on Newegg right now, which is cheaper than this CPU.
If someone needs to build something now and can wait to upgrade RAM in a year or two, 32GB kits are in the $370 range.
I don't like this RAM price spike either, but in the context of building a high-end system with a 16-core flagship CPU like this and probably an expensive GPU, it's still reasonable to build a system. If you must have 128GB of RAM it can be done with bundles like the one I linked above but I'd recommend waiting at least 6 months if you can. There are signs that prices are falling now that panic-buying has started to trail off.
128GB of RAM should not cost $4K even in this market.
$2800 is still a huge price in comparison with the last year.
Last summer, a 9950X3D + motherboard + cooler + 128 GB DRAM + VAT sales taxes was the equivalent of $1400 in Europe, where I live.
That's half of your quoted price. That was without case and PSU, but adding e.g. $200 for those would not change much.
In January I upgraded my desktop, 9950X3D £600, 64GB DDR5-6000 £600, MSI MAG Tomahawk X870E £300, Samsung 990 Pro 4TB £350, Asus Prime 9070XT £580. I spent a another £250 on PSU and cooler and reused my case (Phanteks Evolv Enthoo TG, beautiful case but horrible cooling. Will cut some holes in it and if it doesnt work out look for something with more airflow).
The RAM price was already inflated at that time, and the same kit is now £800, but in October or earlier last year I'd have saved possibly the cost of the CPU/GPU on the whole thing, but now it's be about the cost of a CPU/GPU more expensive.
On a side note for anyone not aware, 9950X3D isn't the best choice for pure gaming, 9850X3D is cheaper and marginally better, also I went with 2 sticks of RAM kit, 4 sticks is much harder to run at the advertised speed (6000) which is actually an overclock.
Im a dev and a linux user/gamer hence my choice of CPU/GPU.
Yes of course. We all know prices are up.
I commented because someone thought that $4K was the going price for 128GB of RAM, which is way too much even with the demand crunch.
Due to the high prices of DRAM and SSDs they now are the greatest fractions of the total price of a computer.
In January I was forced to upgrade an ancient Intel NUC, by replacing it with an Arrow Lake H based ASUS NUC. The complete system with 32 GB DRAM and 3 TB SSDs has cost EUR 1200, including VAT sales tax.
The distribution of the price was like this:
Barebone mini-PC: 41%
32 GB DDR5 SODIMMs: 26%
2 TB PCIe 5.0 SSD: 24%
1 TB PCIe 4.0 SSD: 9%
Before 2026, for so small amounts of memory its cost would have been much less than the rest of the system.
I bought 192GB (4x 48GB) of DDR5-6400 for 299 euro in September but returned it because I couldn't get 4 DIMMS to run at decent speeds in the system.
6 or so weeks after I returned it the kit was listed at 1499.
Yeah the only way to run 4 sticks of DDR5 decently is with Intel. It's a bit of a shame that you can't cram enough RAM to run big models.
The most I could get running on 10GB VRAM + 96GB RAM was a REAP'd + quantized version of MiniMax-M2.5
Got it running with 4800MT/s and literally 30 minute boot times in an AM5 machine. The 30 minute boot time could be worked around by enabling the (off-by-default) memory context restore option in BIOS, but it really made me think something was broken and it wasn't until I found other people talking about 30 minute boot times that I stopped debugging and just let it sit for an eternity.
It's so bad. I don't get why they sell AM5 motherboards with 4 RAM slots.
At least that system has been running well for like two years. But had I known that the situation is so much more dire than with DDR4, I would've just gotten the same amount of RAM in two sticks rather than four.
I’m in the same situation! My machine will take 2-5 minute to post every few reboots, it seems random. The messed up part is the marketing material says this things can handle 256gb of ram or whatever absurd number, f me for thinking then 128gb should be no problem. Honestly this whole thing has soured me on AMD. Yea they have bigger numbers than intel but at what cost, stability?
You need to enable MCR (which trains the memory once and caches the result for (iirc) 30 days) otherwise yeah, booting is horribly slow, even the 64GB I have can take several minutes but with MCR it boots basically instantly.
Some motherboards have it off by default.
Memory training seems to be getting faster with each bios update. In 2024 when I upgraded to AM5, 64GB memory training took like 15 minutes. Now the same setup takes about a minute when it needs to retrain, then near instant with MCR (Windows 11 takes significantly longer to load than the POST process).
Your machine takes 30 minutes to boot because of the RAM? Or it takes 30 minutes to load a model?
It's the RAM. It needs to "trained" which takes some time but for for some reason these boards seem to randomly forget their training, requiring it to happen again.
I've never had memory training be forgotten with my AM4 nor LPDDR5-based laptops and NUCs. Is this a new thing with AM5 or something? Or just a certain brand of BIOSes?
It's a common issue on consumer boards with DDR5 and more than two DIMMs installed.
Doesn’t affect soldered memory or lower speed memory (like DDR4). Many memory controllers fail to achieve good speeds and timings at all on 4 DDR5 DIMMs, and fall back to running DDR5 at 3600MHz instead.