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

arstechnica.com

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

#71

Post by jodleif »

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

Threadripper is a good alternative. No point having a lot of dual channel ram for LLMs, too slow

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

#72

Post by YoumuChan »

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…

But consumer product does not support SDCI (only Epyc Turin supports it), so it does not benefit too much if an accelerator is involved.

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

#73

Post by Zardoz84 »

chao- wrote: post #4

Crazy to think that my first personal computer's entire storage (was 160MB IIRC?) could fit into the L3 of a single consumer CPU! It's probably not possible architecturally, but it would be amusing to see an entire early 90's OS running entirely in the CPU's cache.

My first computer whole RAM could fit in L1 of a single core (128k)

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

#74

Post by ggm »

bell-cot wrote: post #68
jaimex2 wrote: post #57

Can someone like... boot Windows 98 on these on a system with no ram?!

Conceptually - yes, easily. But to do it literally - I'm not a low-level motherboard EE, but I'd bet you're looking at 5 to 7 figures (US $) of engineering work, to get around all the ways in which that would violate assumptions baked into the designs of the CPU, support chips, firmwares, etc.

Make a fake ram which offers write through guarantee and returns bus no matter what address is referenced. You could possibly short circuit any "is ram there" test if it just says yes for whatever size and stride got configured.

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

#75

Post by tom_alexander »

magicalhippo wrote: post #25

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.

> Probably fun for those who already bought DDR5 memory

Nah, those of us who already bought DDR5 memory also already bought decent CPUs. Dropping another $1k for these incremental gains would be silly. It'd make a lot more sense if DDR5 had been around longer so that people had the option to make generational upgrades to this CPU but DDR5 on AMD has only been around for Zen4 and Zen5.

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

#76

Post by defrost »

chao- wrote: post #4

Crazy to think that my first personal computer's entire storage (was 160MB IIRC?) could fit into the L3 of a single consumer CPU! It's probably not possible architecturally, but it would be amusing to see an entire early 90's OS running entirely in the CPU's cache.

Commodore PET for me - 8 KB of RAM and all the data you could store and read back from a TDK 120 cassette tape . . .

* https://en.wikipedia.org/wiki/Commodore_PET

Same time as the Trash-80 and BBC micro were making inroads.

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

#77

Post by jofzar »

Panzer04 wrote: post #58
jofzar wrote: post #37

Earlier quoted context omitted.

I really want a x3d because a game I play is heavily single threaded, I have the income and the financial stability but I can't in any good conscious upgrade to am5 with the ram prices. It's insane

What game, if you don't mind my asking?

World of Warcraft

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

#78

Post by throawayonthe »

magicalhippo wrote: post #25

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.

oh wow you weren't joking: https://pcpartpicker.com/products/memory/#xcx=0&b=ddr5&Z=131...

(cheapest at $1240 USD)

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

#79

Post by mroche »

snvzz wrote: post #50
magicalhippo wrote: post #25

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.

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 able to even just simulate NUMA subdivisions would be highly useful.

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

#80

Post by slightlygrilled »

timschmidt wrote: post #56
fakwandi_priv wrote: post #51

Earlier quoted context omitted.

AMD had an upgrade path with the 5700x3d, assuming you’re on AM4. Just reading now that they went out of production half a year ago which is a shame. I was very impressed being able to upgrade with the same motherboard 6 years down the line.

I'm the mythical customer who went from a 1700X in a B350 motherboard near launch day to a 5800X3D in the same board (after a dozen BIOS updates). Felt amazing. Like the old 486DX2 days.

Same! Kept checking back for bios updates and even years later they kept announcing more support! Truly crazy.

Other than the speed it’s a very good reason to go with amd, the upgrade scope is massive, on am5 you can go from a 6 core and soon all the way to a 24 core with the new zen6

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