| DonFerrari said: Summarizing your comments, there is a possiblity of GDDR6 if cost come down fast enough in 3 years and make the prospects of cost during the gen mean a GDDR6 is possible, but if that doesn't pick up fast enough the X will be it right? How much faster and bigger pool would you guess? 20GB and 4x faster? |
It's difficult to tell, but the general consensus is that a doubling of capacity and performance for the same costs wouldn't be entirely impossible at a later date, but a more realistic goal is probably 50% gains over GDDR5X in terms of capacity and bandwidth in the shorter term. (As GDDR5X was a middle step.)
The biggest issue with GDDR6 is that it requires more masks which means the big factory's that make the stuff need larger clean rooms and more equipment, so it could take a little longer to ramp up GDDR6 than expected.
Just need to wait and see.
| DonFerrari said: I know next to nothing on HBM... considering current trends and the fact we are closer to DDR type memory on cosoles usually, it would be harder to get HBM than DDR? |
HBM is going to always be more expensive in general I think. So that will always keep it relegated to markets that can afford it, HBM3 just brings those high costs down more.
Still a massively long way away before HBM replaces DDR memory in all markets though.
| DonFerrari said: How feasible or more interesting in cost/performance is bigger chip with higher bit count and clock versus the smaller versions? Keeping same trend we would be looking at perhaps something between 1-4GB per module on how 64 bits or more? |
Well. That depends on what's available, what the price is... There is more to the cost of Ram implementation than the amount of chips or their bus widths.
In general the wider the memory bus or the more chips you have, the more traces you need on the PCB, the more traces on a PCB means potentially more PCB layers.
So you need to have a balance there between the two.
Microsoft for instance didn't reduce the amount of memory chips (But did change the ram chips it was using) between the Xbox One and Xbox One S, both have 16x DDR3 512MB memory chips. DDR3 is cheaper than GDDR5 though.
JEDEC is pushing GDDR6 to top out at 4GB per chip (32Gb, 8 bits in a byte.), 16Gbps. - On a 256bit bus with 16x chips you are looking at 512GB/s of bandwidth with 64GB of capacity, consoles will probably have half that capacity though due to costs.
| Azelover said: It took a long ass time to move from GDDR5 to this one for modern tech standards... |
Indeed.
GDDR5 dropped in 2008 with the Radeon 4870 debut and has stuck around right up until today.
Although AMD and nVidia did boost clock rates, they did increase the bus widths from 256-bit to a massive 512-bit in some instances.
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