AMD's Ryzen 9 9950X3D2 Dual Edition crams 208MB of cache into a single chip

Post by snvzz » Sat, Mar 28, 2026, 2:07 PM UTC

mroche wrote: post #79

snvzz wrote: post #50

Earlier quoted context omitted.

I am glad I decisively ordered 96GB (2x48) DDR5 ECC back in June, alongside the 9800x3d. I hope this is still enough for the planned upgrade to Zen7 in 2028.

I'm looking at building a new system, and was waiting to see what happens with this chip and Intel's Arc Pro B70 card. I can't find ECC UDIMMs of 64GB per-stick to make 128GB, but I can put together two solo UDIMMs of 32GB or 48GB for $800 and $1000 per stick respectively. I really want to see what enabling the L3 cache options in the BIOS do from a NUMA standpoint. I have some projects I want to work on where being…

Post by zahlman » Sat, Mar 28, 2026, 2:18 PM UTC

Aurornis wrote: post #40

monster_truck wrote: post #29

The extra cache doesn't do a damn thing (maybe +2%) The lower leakage currents at lower voltages allowed them to implement a far more aggressive clock curve from the factory. That's where the higher allcore clock comes from (+30W TDP) I'm not complaining at all, I think this is an excellent way to leverage binning to sell leftover cache. Though if I may complain, Ars used to actually write about such things in their…

> The extra cache doesn't do a damn thing (maybe +2%) It depends on the task. For some memory-bound tasks the extra cache is very helpful. For CFD and other simulation workloads the benefits are huge. For other tasks it doesn't help at all. If someone wants a simple gaming CPU or general purpose CPU they don't need to spend the money for this. They don't need the 16-core CPU at all. The 9850X3D is a better buy for mo…

Post by mort96 » Sat, Mar 28, 2026, 2:22 PM UTC

2001zhaozhao wrote: post #69

sspiff wrote: post #62

Earlier quoted context omitted.

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

Post by magicalhippo » Sat, Mar 28, 2026, 2:32 PM UTC

WD-42 wrote: post #116

2001zhaozhao wrote: post #69

Earlier quoted context omitted.

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

I’m running 128gb on a 9550x now with 4x32gb sticks and it’s terrible. It’s unstsable, post time is about 2 minutes (not exaggerating)and I’m stuck at a lower speed. I’m considering just taking 2 of the sticks out and working with 64gb and increasing my swap partition. The nvme drive is fast at least. This is my first time off intel and I have to say I don’t understand the hype.

Post by sqquima » Sat, Mar 28, 2026, 3:52 PM UTC

alias_neo wrote: post #95

adrian_b wrote: post #81

Earlier quoted context omitted.

$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…