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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

#91

Post by monster_truck »

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…

It really doesn't. In virtually every case the work is being completed faster than the cache can grow to that size. What little gains are being realized are from not having to wait for cores with access to the cache to become available.

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

#92

Post by hrmtst93837 »

basilikum wrote: post #12
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.

KolibriOS would fit in there, even with the data in memory. You cannot load it into the cache directly, but when the cache capacity is larger than all the data you read there should be no cache eviction and the OS and all data should end up in the cache more or less entirely. In other words it should be really, really fast, which KolibriOS already is to begin with.

[flagged]

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

#93

Post by monster_truck »

YoumuChan wrote: post #72
Aurornis wrote: post #40

Earlier quoted context omitted.

> 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.

It's also useful to point out that the use cases and workloads where SDCI are most beneficial are far, far beyond the scope of what anyone will have installed in a Zen rig. Dual 100G networking cards? The cost of both of those damn near buys all of a 9950X3D2 setup.

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

#94

Post by monster_truck »

bell-cot wrote: post #66
spockz wrote: post #61

Earlier quoted context omitted.

I think GP was saying that the additional 3D cache on this chip compared to the standard x3d isn’t going to do much. I’m curious to see whether the same benchmarks benefit again so greatly.

> I think GP was saying... Agree. The article's 2nd para notes "AMD relies on its driver software to make sure that software that benefits from the extra cache is run on the V-Cache-enabled CPU cores, which usually works well but is occasionally error-prone." - in regard to the older, mixed-cache-size chips. > I'm curious to see... Yeah - though I don't expect current-day Ars Technica will bother digging that deep. I…

Some of their writers, who are quite excellent, still do. Others just seem to regurgitate press releases with very little useful investigation.

How critical of the lazy writers I am may seem outsized, but I grew up reading and learning from the much better version of Ars -one I used to subscribe to.

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

#95

Post by alias_neo »

adrian_b wrote: post #81
Aurornis wrote: post #43

Earlier quoted context omitted.

> 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 upgr…

$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.

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

#96

Post by [deleted] »

jofzar wrote: post #37
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 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

[deleted]

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

#97

Post by tumdum_ »

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 pc had 40MB hrs and 8MB ram :D

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

#100

Post by spockz »

bell-cot wrote: post #66
spockz wrote: post #61

Earlier quoted context omitted.

I think GP was saying that the additional 3D cache on this chip compared to the standard x3d isn’t going to do much. I’m curious to see whether the same benchmarks benefit again so greatly.

> I think GP was saying... Agree. The article's 2nd para notes "AMD relies on its driver software to make sure that software that benefits from the extra cache is run on the V-Cache-enabled CPU cores, which usually works well but is occasionally error-prone." - in regard to the older, mixed-cache-size chips. > I'm curious to see... Yeah - though I don't expect current-day Ars Technica will bother digging that deep. I…

I hoping that phoronix will be able to redo the benchmark of the 9950x3D with this new X3D2 variant.

I might even shell out for an upgrade to AM5 and DDR5. On the other hand, my 5900X is still blazing fast.

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