South Korean DRAM and NAND flash giant SK Hynix updated its product catalog to feature its latest GDDR6 memory, besides HBM2. The company had April announced its first GDDR6 memory products. The first GDDR6 memory chips by SK Hynix come in 8 Gb (1 gigabyte) densities, and data-rates of 14 Gbps and 12 Gbps, with DRAM voltages of 1.35V. The company is giving away small quantities of these chips for product development, mass production will commence soon, and bulk availability is slated for Q4-2017. This would mean actual products implementing these chips could be available only by very-late Q4 2017, or Q1-2018.
A graphics card with 14 Gbps GDDR6 memory across a 256-bit memory bus (8 chips) features 448 GB/s of memory bandwidth. A card with 384-bit (12 chips), should have 672 GB/s at its disposal. Likewise, the 12 Gbps memory chips offer 384 GB/s in 256-bit (8-chip) setups, and 576 GB/s in 384-bit (12-chip) setups. Meanwhile, SK Hynix also updated its HBM2 catalog to feature a 32 Gb (4 gigabyte) HBM2 stack, with a clock speed of 1.60 Gbps. The 2.00 Gbps stack which featured in the Q4-2016 version of this catalog is no longer available. At 1.60 Gbps, a GPU with four stacks has 819.2 GB/s of memory bandwidth. A chip with two stacks, such as the “Vega 10” prototype that has made several media appearances, hence has 409.6 GB/s.