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[Bofferbrauer2]

Pemalite said:

Bofferbrauer2 said:

Also, I know DDDR5 ain't the cure, but it will still boost the bandwidth quite a bit. Hence why I only went with a modest increase to 12CU with Zen 4. But it will certainly help, and with the infinity cache, allow to get close to Polaris performance (as in the RX 470) in 2023-2024

It's 64GB/s of bandwidth verses 211GB/s of bandwidth, the RX470 will be able to scale better at higher resolutions when you become fillrate limited.. So that infinity cache will really need to be something substantial.
Plus the RX470 will likely have the ROP, Texture and Compute advantage as well.

In saying that... Dual Channel DDR4 3600mhz can do 57.6GB/s... Sadly laptop APU's aren't pushing that though, they stop at 51.2GB/s.

I wonder why you measure with dual channel DDR5-4000 as if that were the limit. Did mix up the speeds with those from DDR4X? After all, DDR5 is supposed to start at 4800, and go all the way to 6400 - for now (higher speeds are planned for later by JEDEC). By that point, you have 51.2GB/s per channel, or 102.4GB/s on a standard dual channel board, quite a bit more than just 64GB/s. Unless you meant on a single channel, which will certainly be possible shortly before DDR6 comes along...

Of course, that would still just be half of the bandwidth of the RX 470. However, the RX 470 gets beaten in performance by the RX 5300XT despite the latter only having 112GB/s. So either the bandwidth of the RX 470 was oversized, or RDNA needs much less of it than GCN4 to push pixels around.