AMD's new APU puts all others to shame.
One of the most awesome developments in chipmaking in recent years has to be chiplets and stacking said chiplets on top of one another. The possibilities, as they say, are endless. AMD showed how gaming frame rates can be bolstered by stacking more cache onto a processor with theAMD is using its 3D chip-stacking tech to combine a CPU and GPU onto one absolutely mammoth chip: the AMD Instinct MI300.
It's not just that this chip has both a CPU and GPU on it. That's not particularly noteworthy these days—basically everything we consider a CPU nowadays has a GPU integrated into it. AMD's no stranger either, it's been making APUs for years—essentially chips with both CPU and GPU under one roof. That's actually what AMD defines the MI300 as: an APU.This is a data centre accelerator that containstransistors.
The chip delivers a GPU born out of AMD's CDNA 3 architecture. That's a version of its graphics architecture built only for compute performance—RDNA for gaming, CDNA for compute. That's packaged alongside a Zen 4 CPU and 128GB of HBM3 memory. The MI300 comes with nine 5nm chiplets on top of four 6nm chiplets. That suggests nine CPU or GPU chiplets on top of what is presumed to be the four-piece base die it's all loaded onto. Then there's memory around the edges of that.
The idea being that if you load everything onto one package with fewer hoops for data to jump through to get around, you end up with a highly efficient product compared to one that's perhaps making loads of calls to memory off-chip, slowing down the whole process. Computing at this level is all about bandwidth and efficiency, so this sort of approach makes a lot of sense. It's the same sort of principle to something like AMD's Infinity Cache on its RDNA 2 and 3 GPUs.
But there are a few reasons why we don't have an MI300-style accelerator for gaming. For one, reasonable expectations for most gamers' budgets would suggest we can't afford whatever AMD's looking to charge for an MI300. It's going to be a lot. Similarly, no one's quite cracked how to program a game to see multiple compute chips on a gaming GPU as a single entity without specific coding for it. We've been there with SLI and CrossFire, and it didn't end well.
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