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It is a pure marketing slide. The M3 variants floorplans don't look anything like that, as can be seen on other pictures of the dies. That being said, it's pr
by monocasa 3y ago
It is a pure marketing slide. The M3 variants floorplans don't look anything like that, as can be seen on other pictures of the dies.
That being said, it's pretty common to have dedicated silicon for video codecs. It normally takes the form of a little DSP with custom instructions to accelerate operations specific to the codec.
- conjecTech 3y agoI agree that is how I'd expect it to be implemented, but I'm not sure how small it would be given the processing bandwidth we are talking about for 4k video. I'm guessing this is a distinct region of the chip and not integrated with CPU/GPU since they scale up by replicating those blocks and wouldn't want to redundantly place that hardware. Having it separate also allows a team to work on it independently. I think the relative size of the media engines is accurate in that slide, so then it comes down to how large the ProRes parts are in other chips. They are probably a couple of the unlabeled regions next to the performance cores in the M1 Pro die shot below, but I don't know which. https://images.anandtech.com/doci/17019/M1PRO.jpg https://images.anandtech.com/doci/17019/M1PRO.jpg Taken from: https://www.anandtech.com/show/17024/apple-m1-max-performance-review https://www.anandtech.com/show/17024/apple-m1-max-performanc...
- lxgr 3y agoA GPU is also not a monolith. As you say, there are some functions that scale with the number of compute units, but others don't need to (e.g. display scan-out controllers); it would accordingly make sense to make the video coding functions part of the latter. And video decoding/encoding is definitely at least GPU-adjacent, since it usually also involves scaling, color space transformations etc.
- IshKebab 3y agoYes exactly. But are you going to have a different DSP for each codec? Doubtful.
- monocasa 3y agoI've seen it. Sometimes because the DSP is hyperspecialized for a particular codec. Sometimes just because the SoC vendor bought the hard codecs from different sub vendors.
- marcellus23 3y ago> The M3 variants floorplans don't look anything like that Maybe I'm misunderstanding what you're saying, but the slide is of an A17, not an M3 chip.
- monocasa 3y agoOh, fair enough, got my wires crossed from the M3 announcement. The A17 floorplan looks nothing like that either. https://twitter.com/highyieldYT/status/1711453511848706228 https://twitter.com/highyieldYT/status/1711453511848706228