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AMD releases a new flagship CPU for consumer market with 128M of L3 Cache

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Re: AMD releases a new flagship CPU for consumer market with 128M of L3 Cache

#191

Post by [deleted] »

jiggawatts wrote: post #174
noobermin wrote: post #144

Earlier quoted context omitted.

Let's be real, this just means now web developers can ship their own browser written in electron with the javascript interpreter written in nodejs, and that is literally what they will do with this.

You joke, but I can imagine a scenario where someone ports a complex GUI app to the web using something like Blazor and accidentally ends up with a full web browser running in WASM, on top of an actual browser. I can also foresee an entire industry popping up to do this on purpose in the name of “compatibility”. I’m sure the marketing will talk about the efficiency of being able to run “true” IE6 on top of Chrome in…

[deleted]

Re: AMD releases a new flagship CPU for consumer market with 128M of L3 Cache

#192

Post by mixmastamyk »

treesciencebot wrote: post #48
mixmastamyk wrote: post #29

Do we have an easy to find brand/line with ECC memory at reasonable prices yet?

2 x 32GB ECC UDIMM DDR5-4800 RAM is going around for ~280$ here (including a %20 VAT, so I'd assume it would be a little bit cheaper in the states). Not really unreasonable considering regular DIMMs (albeit with higher speeds like 6000) going for 400$ for the same configuration.

Not merely the modules but chipset and firmware support are required as well. Sometimes they are even incompatible so certification comes up. Put together a few cheap things and the price jumps to business levels.

Re: AMD releases a new flagship CPU for consumer market with 128M of L3 Cache

#193

Post by bick_nyers »

perihelions wrote: post #33

AnandTech sees some intriguing regressions on certain benchmarks, https://www.anandtech.com/show/18747/the-amd-ryzen-9-7950x3d... ( "CPU Benchmark Performance: Simulation" ) Worst is Factorio, which is down -47% against the 5800X3D (a previous-generation CPU that also uses stacked L3 cache), on the benchmark "10K trains". Wonder what's going on there? - "We would have expected higher performance in our Factorio bench…

I didn't read the article but according to Gamers Nexus latest video you REALLY need the latest BIOS and Chipset drivers for this part because it is what tells Windows which CCD the game threads should be parked on.

Re: AMD releases a new flagship CPU for consumer market with 128M of L3 Cache

#194

Post by bick_nyers »

Salgat wrote: post #158

I'm not a fan of how they park the slower CCD, since it means that the scheduler will try to force all processes onto the same CCD (regardless of whether it's for the game), instead of offloading the non-game workloads onto the other CCD. This is an issue if you run background tasks (such as streaming) or have multiple monitors setup for other things like browser etc.

In addition, different game threads for the same game (or even functions within the game threads!) may benefit differently. Physics calculations may benefit from cache in a different way from other game calculations. Even if you zoom into the different type of physics calculations, there are ballistics, soft-body physics, hair, clothing, foliage, water, etc.

It would be interesting to see what kind of performance could be achieved with PERFECT scheduling. That would probably require the CPU to do process scheduling via specialized circuitry though as opposed to (or in conjunction with) the OS.

Re: AMD releases a new flagship CPU for consumer market with 128M of L3 Cache

#195

Post by paulmd »

brucethemoose2 wrote: post #189
paulmd wrote: post #171

Earlier quoted context omitted.

epyc has v-cache on every die on -X skus, doesn't it? it's fine https://www.anandtech.com/show/17323/amd-releases-milan-x-cp... > Critically, AMD has opted to equip all of their new V-cache EPYC chips with the maximum 768 MB of L3 cache, which in turn means all 8 CCDs must be present, from the top SKU (EPYC 7773X) to the bottom SKU (EPYC 7373X). Instead, AMD will be varying the number of CPU cores enabled in each CCD…

They very specifically said it was an interconnect issue. With the extra L3, adjacent dies made so many requests to each other's cache that it turned into a bottleneck, and this wasnt an issue on Milan X because its IO die is apparently beefier. I cant find the source because I am on mobile and now google search is flooded with X3D chatter :/

interesting, if you can find it in your history let me know!

Re: AMD releases a new flagship CPU for consumer market with 128M of L3 Cache

#196

Post by petronio »

mosquitobiten wrote: post #184
Firther wrote: post #121

Earlier quoted context omitted.

It's not quite the same out of the box experience (after making sure you have the latest chipset drivers, use the balanced power plan and NOT the performance plan, and have Xbox Game Bar..), but it's possible to force certain processes and executables to run on specific CPU cores in Linux using taskset and verify that they're running on the correct cores. It will be a little tedious if you play a lot of games on Stea…

What about a VM with GPU pass-trough? Let's say I have plenty of storage and just create different VMs with selected distro or winXI that have certain games. Could that also be an option? Just drag and drop the appropriate game in the VM storage?

Yes, for GPU passthrough you usually assign specific cores to the VM and isolate them (to reduce hiccups caused by other tasks using the core), so in this case you'd just assign the cores with the extra cache.

Re: AMD releases a new flagship CPU for consumer market with 128M of L3 Cache

#197

Post by icedchai »

bee_rider wrote: post #122
londons_explore wrote: post #110

Lots of software could run in just 128MiB, especially if it could page stuff out to ssd. CPU's usually have a cache-as-ram mode that can enable this. Does this mean that systems where you can hot swap all the ram at once will be possible?

It doesn’t feel that long ago, that computers would have hundreds of megabytes of RAM. I remember it — my back is a little sore, but I’ve still got all my hair.

Yep, crazy. One of the early web dev shops I worked for had an NT server with 64 megs of RAM. They also had a Sun box with 128 megs. This was around 1995 - 96.

Re: AMD releases a new flagship CPU for consumer market with 128M of L3 Cache

#198

Post by icedchai »

eklitzke wrote: post #177
londons_explore wrote: post #110

Lots of software could run in just 128MiB, especially if it could page stuff out to ssd. CPU's usually have a cache-as-ram mode that can enable this. Does this mean that systems where you can hot swap all the ram at once will be possible?

I don't think there are many applications where you can run the whole stack (including OS) in 128 MB of RAM, but where you also need a $700 CPU.

It would be interesting to see if an early version of Linux could run entirely out of cache. My first Linux box had 3 megs of RAM (1 on the motherboard, 2 on an expansion card.)

Re: AMD releases a new flagship CPU for consumer market with 128M of L3 Cache

#199

Post by shmerl »

amrb wrote: post #154
perihelions wrote: post #33

AnandTech sees some intriguing regressions on certain benchmarks, https://www.anandtech.com/show/18747/the-amd-ryzen-9-7950x3d... ( "CPU Benchmark Performance: Simulation" ) Worst is Factorio, which is down -47% against the 5800X3D (a previous-generation CPU that also uses stacked L3 cache), on the benchmark "10K trains". Wonder what's going on there? - "We would have expected higher performance in our Factorio bench…

Its worth say that the 3D V-Cache is only on the left of the two dies, while the other is frequency unlocked. Also linking my favorite tech reviewers benchmark they do some great Linux/tech videos also! https://www.youtube.com/watch?v=jNMcdIkef_c

Linux video here: https://www.youtube.com/watch?v=5yDsEbSxHkM

Re: AMD releases a new flagship CPU for consumer market with 128M of L3 Cache

#200

Post by shmerl »

Prunkton wrote: post #90
pella wrote: post #13

"AMD Ryzen 9 7950X3D Linux Performance" https://www.phoronix.com/review/amd-ryzen9-7950x3d-linux "AMD Ryzen 9 7950X3D Desktop CPU Review Roundup" https://videocardz.com/150677/amd-ryzen-9-7950x3d-desktop-cp...

the Linux test leaves me quiet confused how to pick my next linux gaming cpu. On the one hand side Gamers Nexus is making a point [0] (there are on/off performance charts later in the video) why it is super important to install the latest windows drivers + special windows gaming software to make use of the heterogeneous architecture. On the other hand side the linux tests are much better then I would expected since i…

So far I'm deciding between 7950X and 7950X3D and it's not clear cut which one is better. I plan both to compile stuff on it and play games.
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