SK Hynix's GDDR6 at 14Gbps offers up to 672GB/sec

We've been reporting about GDDR6 technology for a while now, but SK Hynix detailed its upcoming memory technology in their recent memory catalog, with GDDR6 scheduled for Q4 2017.

SK Hynix confirms two different variants of GDDR6, with both offerings being 8Gb (1GB) modules with different frequencies: 12Gbps and 14Gbps. Both modules will use 1.35V.

I've got some details on what memory bandwidth numbers to expect, which is exciting:

• GDDR6 @ 12Gbps on 256-bit: 384GB/sec
• GDDR6 @ 14Gbps on 256-bit: 448GB/sec
• GDDR6 @ 12Gbps on 384-bit: 576GB/sec
• GDDR6 @ 14Gbps on 384-bit: 672GB/sec

Let's play with these bandwidth numbers, and use NVIDIA's next-gen Volta graphics cards that are expected late 2017/early 2018. I'm expecting NVIDIA to release a GTX 2080/1180 graphics card using the Volta GPU, and GDDR6 memory on a 256-bit memory bus to replace the GTX 1080 with its GDDR5X on a 256-bit memory bus. This would see the GTX 2080 with 384GB/sec of memory bandwidth, compared to the 320GB/sec available on the GTX 1080 and its GDDR5X @ 10Gbps.

A possible GeForce GTX 2080/1180 replacement should feature a 384-bit memory bus, and would have 576GB/sec of memory bandwidth with 12Gbps GDDR6, and up to a huge 672GB/sec on 14Gbps GDDR6. This is up from the 480GB/sec available on 10Gbps GDDR5X, and 528GB/sec on 11Gbps GDDR5X.