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this post was submitted on 20 May 2024
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It’s been a while since I’ve coded on the Xbox, but at least in the 360, the memory wasn’t really unified as such. You had 10 MB of EDRAM that formed your render target and then there was specialised functions to copy the EDRAM output to DRAM. So it was still separated and while you could create buffers in main memory that you access in the shaders, at some penalty.
It’s not that unified memory can’t be created, but it’s not the architecture of a PC, where peripheral cards communicate over the PCI bus, with great penalties to touch RAM.
Well for the current generation consoles they're both x86-64 CPUs with only a single set of GDDR6 memory shared across the CPU and GPU so I'm not sure if you have such a penalty anymore
Are there any tests showing the difference in memory access of x86-64 CPUs with iGPUs compared to ARM chips?