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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

#201

Post by zamadatix »

sp332 wrote: post #91
zamadatix wrote: post #32

Earlier quoted context omitted.

The way I understand it JEDEC had standardized KB/MB/GB being multiple-of-2-based in memory specs prior to the IEC standardising KiB/MiB/GiB for the same. As a result it kind of just stuck in the space since the idea of multiple-of-10 cache is a bit silly anyways so there is no risk for confusion.

That doesn’t answer why people use M instead of MB let alone MiB.

Because there is no other interpretation of M that makes sense (neither megabits or base 10 megabytes) you can shorten it further without loss of info, so naturally people have since why not. A similar story can be said of network interface speeds like "10G" which makes its way even to standards names like "10GBASE-SR".

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

#202

Post by asynchronyse »

anticensor wrote: post #168
alyandon wrote: post #21

Earlier quoted context omitted.

I just disable PBO on my 3900X - you are 100% correct that an extra 5% performance is not worth the extra 30% power draw/heat.

PBO also allows undervolting though: I just applied -30 all core offset on my 5950X.

I'm wondering how much clock speed you gave up to achieve stability at -30.

I could barely be stable at -15 all core on a 5900X at zero clock offset.

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

#203

Post by bee_rider »

icedchai wrote: post #197
bee_rider wrote: post #122

Earlier quoted context omitted.

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.

Somewhat happy to have been a kid for 90’s computers. They were fun to play around with, but I can’t imagine trying to get work done on them, haha.

Of course in some objective sense I have to recognize that the workloads were sized to fit…

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

#204

Post by FeepingCreature »

jrmg wrote: post #118
FeepingCreature wrote: post #98

Earlier quoted context omitted.

It's not like the CPU looks at the FPS to decide how to clock. Factorio has extremely variable CPU demand as your base grows.

Modern CPU and scheduler combos will in fact try to do that or, at least, do something that has that as a second order effect. They’ll try to run the CPU at a speed that evens out regular bursts into steady loads, on the lowest power core on which that’s possible to do. Edit: although, for that to work for this workload Factorio itself would need to be updating at a steady 60 updates/s, which I guess is not actually…

I mean, sure, if Factorio was running at 60 stably the CPU would downclock until it was just about keeping up. My point is more that artificially running Factorio at unlocked tickrates (above 60) makes sense for a benchmark, because if it can hit 115 in that map that tells you it'll be able to keep 60 in a map that's twice as big. Ie. I'm saying it's not like the CPU is using a different mode below 60 and above 60 as long as the tickrate is unlocked; there's nothing special about 60, it just happens that's what Factorio is normally limited to.

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

#206

Post by icedchai »

bee_rider wrote: post #203
icedchai wrote: post #197

Earlier quoted context omitted.

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.

Somewhat happy to have been a kid for 90’s computers. They were fun to play around with, but I can’t imagine trying to get work done on them, haha. Of course in some objective sense I have to recognize that the workloads were sized to fit…

Software was much less bloated then. Of course, it does a lot more now (but probably not 1000x more... as I write this from a desktop with 64 gigs of RAM.)

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

#207

Post by jnwatson »

jrmg wrote: post #83
shock-value wrote: post #38

Earlier quoted context omitted.

[flagged]

Is there a point to going beyond 60 updates/s in Factorio? Because if not the system seems to be doing the correct thing and using less power. I hope AMD isn’t causing higher power usage for all users just to game some benchmarks!

Megabases can get quite processor intensive. Small bases with high ups are a proxy for megabases with reasonable ups.

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

#208

Post by jnwatson »

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…

Nightmare fuel.

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

#209

Post by Macha »

ecnahc515 wrote: post #146
londons_explore wrote: post #104

Earlier quoted context omitted.

An OS can easily run an app on each for a few milliseconds, look at the performance counters to see which ends up with more instructions executed, and then move the task to where it performs best. From time to time, it can retry the test, because software frequently changes what it spends time doing.

I'm pretty sure this is how Nvidia's game ready drivers work. They come with a bunch of pre-made profiles for popular video games, so the optimal settings are configured based on what applications are being executed, which is also why you have to let it scan for your games, so it knows what executables to watch for, so it can properly select the right profile to use.

My understanding is there's a certain amount of nvidia cleaning up after the game developers too. e.g. replacing poor performing shaders with optimised versions or just old-MS style "let's change how the driver works to keep the game working". Which is why they've been so resistant to opening the driver, they believe some of their perf advantage/secret sauce is in the driver rather than the hardware.

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

#210

Post by bee_rider »

jeffbee wrote: post #128
bee_rider wrote: post #123

Earlier quoted context omitted.

I feel like I must be asking a dumb question, because it is a pretty obvious one. But would it be better to just buy a lower-performing, lower-cost chip in that case? Does the silicon lottery they results in an i9 also result in better performance per watt?

Yeah, it definitely depends on your use case. In my opinion the only reason to get the K or KS SKU is that you want, and are sensitive to, the extra speed bins you get on the 2 magic P-cores. The KS is a full 10% faster on single-threaded, compute-bound workloads. That's like importing the next generation CPU from the future and it is worth it for some use cases. Even with 1 core running at 6GHz you won't blow out a…

Ah, so tune down the E-cores to provide headroom for the P-cores? That seems like a pretty reasonable thing to do.
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