In a technical documentation Micron chats up close: It’s about memory with a high transfer rate – and in this context about Nvidia’s upcoming GeForce generation RTX 3000 with the code name Ampere. The memory manufacturer names the GeForce RTX 3090 as a potential top model.
According to its own announcements, Micron has been working on GDDR6X together with Nvidia (PDF download), an extension of the previous JEDEC specification GDDR6 like GDDR5X at the time. The document discovered the website Videocardz. GDDR6X uses quadruple pulse amplitude modulation to amplify the signal quality for transmission rates of up to 21 Gbit / s per pin at the start. Micron also plans to offer chips with 24 GBit / s next year. For comparison: GDDR6 currently has a maximum of 18 GBit / s.
GeForce RTX 3090 with 12 GB
According to Micron’s listing, the GeForce RTX 3090 comes with 12 GB of GDDR6X memory that achieves 19 to 21 GBit / s (4750–5250 MHz). Twelve 8 GBit chips with transfer rates of 912 GB / s to a good 1 TB / s are soldered, depending on the actual RAM speed. That would speak for a 384-bit wide memory interface for the GeForce RTX 3090.
In the rumor mill there was recently speculation about a short-term doubling of the storage capacity to 24 GB in the GeForce top model, among other things in the Chinese Chiphell forum. Since Micron will only be offering GDDR6X chips with 16 GBit from 2021, 24 GB could only be implemented using 24 chips. For this, Nvidia would again need a new PCB design, which would take additional preparation time before the market launch.
We asked Nvidia to comment on the Micron document, but we didn’t get a response late Friday afternoon. The official unveiling should take place on September 1, 2020, for which Nvidia has announced a “GeForce Special Event”.