this post was submitted on 15 Nov 2023
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GDDR7 memory chips will be in production with either 2 or 3 GB sizes, which means 36GB of VRAM on 384-bit bus could be a possibility for next gen.
Can see 5090 30GB and 5090 Ti 36GB and then a 72GB Quadro.
32GB 5090 and 24GB 5080 is the most realistic configuration.
Also expect both of them to have ridiculous prices. $1500+ for the 5080 and $2500 FE MSRP for the 5090 wouldn't surprise me. AMD is skipping high-end for 1 generation so their competition will likely be a $1000 5070Ti. The 7900XTX or a refresh of it will be AMD's flahship until RDNA5. They have their valid reasons for that but it's very bad news for Nvidia customers, as much as they like to bash AMD.
Nvidia also wants to protect their way more expensive professional lineup so especially the 32GB 5090 will be priced to the moon.
Rumors have a 5090 with GDDR7 and a 384-bit bus. Micron has GDDR7 modules on their roadmap as 2GB and 3GB. This means that the memory configurations for 2GB modules will be 24 or 48GB, and with 3GB modules it will be 36GB or 72GB.
32GB would imply it's a 256 or 512-bit bus, neither of which are very likely for a xx90. I could see them maybe going as low as a 320-bit bus for 30GB. Even 33GB with a 352-bit bus is more likely.
The 5080 will be another thing, 24GB would imply a 256-bit bus with 3GB modules. Nvidia has been all over the map with the xx80 memory width, so it will be anyone's guess. If they prioritize memory bandwidth and use a 320-bit bus, a 20GB card is most likely.
GDDR prevents having arbitrary memory sizes.
A 20GB 5080, probably at an even higher MSRP than the 4080 due to a lack of competition, would be criminal.. There was supposed to be a 20GB 3080 for crying out loud. And games will def go over 16GB before next next gen so 4080 owners will face a VRAM bottleneck and then their upgrade option is a $1500 5080 omg.
I heard the 512-bit rumor and thought Nvidia was FINALLY fixing their VRAM issue across their entire product stack.. Sigh.