Over at videocardz they claim to have confirmed the final GDDR6X memory volume sizes for the GeForce RTX 3080 and 3090. The rumors have been going up and down quite a bit, this however could and should be the final number.
We have to concur with Videocardz on this, as we heard chatter and noise mentioning similar things, they confirmed this (to their won saying) with AIBs. So there is the breakdown, GeForce 3080 will be released with 10GB of GDDR6X graphics memory initially. There is still word out there for a possible 20GB version later on. The 10GB however would be confirmed. That means the memory bus sits at 320-bits wide.
Then the flagship will be one big whopper as it gets fitted with 24 GB GDDR6X graphics memory. And that means a 384-bit wide memory interface. For the rest of the cards nothing is known. The 10GB 3080 and 24GB 3090 version cards can be considered the final spec. GDDR6X has been announced already and can be configured in a 19 to 20 Gbps range. And that's a holy-mother-of-gawd bandwidth alright.
Earlier on a Twitter use named @GarnetSunset posted the photos below the fold. The NVIDIA GeForce RTX 3090 as a graphics card is going to be big alright, as the way I see it, that's three slots. The name of the card has been blurred out. GeForce RTX 3090 us rumored to have a GA102-300-A1 GPU armed with 5,248 shader processors spread over 82 SMs. And likely that is still not a fully enabled chip :-)
Micron earlier already shared a document about GDDR6X being capable of close to 1 TB/sec in bandwidth. Working closely with NVIDIA the new refreshed memory would be able to deliver 19 to 21 Gb/s (data-rate per pin). That means if there are 12 GDDR6 ICs on board, it will reach 1 TB/s of bandwidth.
So math it and it would become 912 to 1008 GB/s. The Micron roadmap also included a 16 Gb GDDR6 in 2021 to be able to reach 24 Gb/s. The interesting part is that the document is listing the unannounced GeForce RTX 3090 ... at 12GB. So yeah, Micron spilt some beans. they confirmed the naming to be the 3000 series, they named GeForce RTX 3090, they confirm the memory type and bandwidth.
GeForce RTX 3090 gets 24GB GDDR6X and GeForce RTX 3080 to have 10GB GDDR6X
