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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

#141

Post by Macha »

TacticalCoder wrote: post #3

Does this 7950X3D have an iGPU? P.S: the table in TFA lists the 7700 as having the same 105W as the 7700X. I think that's a slight mistake and the 7700 is 65W max listed TDP instead. FWIW I'm considering a 7700 for I'm not ultra happy with my 3700X (one of the reason being it has no iGPU and I could find a passive GPU with a NVidia chipset, forcing me to use proprietary drivers in Linux and it's a major PITA for if I…

What do you need the iGPU to render?

A desktop or IPMI? Sure, it has one.

An actual game? It may as well not. It won't compete with the iGPUs on Intel CPUs or even AMD's APUs.

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

#142

Post by tracker1 »

Tuna-Fish wrote: post #95
sliken wrote: post #93

Earlier quoted context omitted.

Or just buy the X3D that have cache on each CCD instead of half of them.

More precisely, buy the X3D that has only one CCD. There is currently no consumer model with 2 CCDs and X3D on both of them.

Yeah... if you're going to see bigger gains from the cache, fewer cores in 7800X3D in early April is probably a better option (same for gamers).

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

#144

Post by noobermin »

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?

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.

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

#145

Post by nfriedly »

bee_rider wrote: post #123
jeffbee wrote: post #39

Earlier quoted context omitted.

In my experience you can tune the i9-13900K way down on power and barely notice or not at all. I wouldn’t be surprised if these benchmarks came out the same way on the Intel side with power caps set at 125W.

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?

I haven't done this recently, and it was in a laptop CPU, but in the past I was able to get a combination of lower power/temps and better performance by undervolting an Intel CPU. Presumably something similar can be done with current-gen desktop CPUs, although perhaps they're running closer to the limits these days.

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

#146

Post by ecnahc515 »

londons_explore wrote: post #104
brucethemoose2 wrote: post #100

Earlier quoted context omitted.

Its more of a fundamental scheduling issue. The unlike big/little cores OS has no idea what apps "prefer" cache or frequency.

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.

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

#147

Post by therein »

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.

And that's why we have the "Game Ready" driver mess.

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

#148

Post by undersuit »

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?

Cache-as-Ram has been apparently been removed from AMD Zen processors.

https://git.furworks.de/coreboot-mirror/coreboot/commit/a245...

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

#149

Post by smileybarry »

londons_explore wrote: post #137
imiric wrote: post #131

Earlier quoted context omitted.

Isn't the TPM meant for precisely that use case?

The TPM is good for storing keys, but can't actually decrypt/encrypt large amounts of data fast as required for disk encryption. So the key ends up temporarily stored in RAM. The fact that most people leave their computers in sleep mode means that to a determined attacker, disk encryption is bypass able by reading the key from RAM.

I think the current sleep implementation in Windows flushes the key from memory before entering sleep, and re-fetches it on-wake. That's one reason for those "BitLocker PC doesn't wake from sleep" bugs in quirky setups.

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

#150

Post by AtlasBarfed »

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?

Lots of software? Like linux, webbrowsers, etc? Arguably all software could run in 128 megs, especially if RAM was "swap" and people stopped obsessing over their javascript UIs.

It still seems a bit far off now, but come on, in 5 years or less we'll see 1GB, that gigabyte level is a huge implicit marketing number.

Might be a harbinger of a new movement in computing: all-cache computing, and reworking OSs and slimming down libraries and other things to fit into cache. It might be the only shot at getting a slimdown revolution going before moore's law really stalls in a couple decades.

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