I would say the evidence for the PS5's APU using chiplets is pretty good at this point. In the Road to PS5, Cerny mentions cache coherency ('cache scrubbers') which might imply AMD's Infinity Fabric is being used, a key feature for connecting chiplets together while improving performance-per-watt. There is also this Reddit rumor which mentions '4 chiplets':
Clearly, some of that rumor, like the memory configuration, does not square with what has been already revealed, but it is not too far off.
The four components mentioned?
1) CPU
2) GPU
3) I/O
4) L4 cache? NAND? Something else?
Of course, the cooling patent mentions 'stacked memory', but this is not particularly specific. Coreteks speculates that a memory chiplet (aka stacked memory) could be used to accelerate ray tracing performance while saving memory bandwidth, and this seems at least plausible. This memory chiplet could be connected directly to the GPU with vias, or it may connect to Infinity Fabric for more general access. Perhaps someone else more familiar with the relevant patents can carry this speculation further? So far it is hard to say, but I do not think we have seen anything that definitively indicates that the PS5's raytracing performance is exceptional. That could mean that the SDK is not ready, or that this is just wrong.
More on AMD's Infinity Fabric technology (from 2017):
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The Heart Of AMD’s Epyc Comeback Is Infinity Fabric
At AMD’s Epyc launch few weeks ago, Lisa Su, Mark Papermaster, and the rest of the AMD Epyc team hammered home that AMD designed its new Zen processorwww.nextplatform.com
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Infinity Fabric (IF) - AMD - WikiChip
Infinity Fabric (IF) is a proprietary system interconnect architecture that facilitates data and control transmission across all linked components. This architecture is utilized by AMD's recent microarchitectures for both CPU (i.e., Zen) and graphics (e.g., Vega), and any other additional...en.wikichip.org
Ya, most of those specs dont line up with official info including using gddr6 not stacked ram.
I believe it can help with screen tearing but I don't know that for sure.I cannot believe that I made it through the last several hundred pages and finally caught up... just to see that the sub will be closed soon. I almost caught up just on time for hype train, but then it took a detour and I lost it. Oh well, at least it will be easier to keep the pace now I guess
Actually, I wanted to ask a question about the TVs which I have not seen being discussed in detail yet. Assuming both XSX and PS5 will use HDMI-VRR as a standard, what will be the benefit from it for fixed-FPS games? HDMI 2.1 TVs that are currently on the market have VRR range of 40-120 Hz, so 30fps games are out of equation completely. 60fps-locked games in theory will not show any difference with VRR on and off. Therefore, visible difference will happen only for FPS-unlocked games that can consistently push above 40fps? I tried to look in up for a while, but there are no consensus on this based on what I have found. Thanks in advance for your replies!