(Update) Rumor: PlayStation 5 will be using Navi 9 (more powerful than Navi 10), new update Jason Schreier said Sony aim more then 10,7 Teraflop

[Bofferbrauer2]

Pemalite said:

 

Bofferbrauer2 said:

@bolded: We don't even know if that's a true chip (and at 20CU, I really doubt it, especially considering it will be totally bandwith starved even with DDR4 4000). But I digress.

DDR4 4000 can offer more bandwidth than HBM2. It is entirely how wide you wish to take things... But before then you reach a point where it's more economical to choose another technology anyway.

However... Considering that current Ryzen APU's with 38GB/s~ of bandwidth are certainly bandwidth starved with 11 CU's... I doubt that is going to change with 20CU APU's that have 68GB/s~ bandwidth.

But if you were to run that DDR4 4000 DRAM on a 512-bit bus, suddenly we are talking 256GB/s of bandwidth, which is more than sufficient for even a 40 CU count.

Knowing you, I'm sure you are aware that to connect the RAM sticks with a 512 bit bus would need many more layers on the motherboards, thus making them hugely expensive, so not exactly an economic solution. It's after all also the reason why we're still stuck with just dual channel, quad channel would help iGPU/APU a lot but make the boards much more expensive.

However, what I could see as possible would be reintroducing the sideport memory, in this case as a 2-4GB HBM stack, functioning as a LLC. But for that I would have expected special boards for APUs, like a 540G and 560GX, similar to the 760G/790GX during the HD 4000 series. Just with a very fast sideport this time, please.