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In a surprising move, SK Hynix has announced its first memory chips based on the yet-unpublished GDDR6 standard. The new DRAM devices for video cards have capacity of 8 Gb and run at 16 Gbps per pin data rate, which is significantly higher than both standard GDDR5 and Micron's unique GDDR5X format. SK Hynix plans to produce its GDDR6 ICs in volume by early 2018.
GDDR5 memory has been used for top-of-the-range video cards for over seven years, since summer 2008 to present. Throughout its active lifespan, GDDR5 increased its data rate by over two times, from 3.6 Gbps to 9 Gbps, whereas its per chip capacities increased by 16 times from 512 Mb to 8 Gb. In fact, numerous high-end graphics cards, such as NVIDIA’s GeForce GTX 1060 and 1070, still rely on the GDDR5 technology, which is not going anywhere even after the launch of Micron's GDDR5X with up to 12 Gbps data rate per pin in 2016. As it appears, GDDR6 will be used for high-end graphics cards starting in 2018, just two years after the introduction of GDDR5X.
SK Hynix is not disclosing too many details about its GDDR6 chips, but they have revealed that the chips are 8 Gb devices with 16 Gbps data transfer rate, which in turn are being manufactured on SK Hynix's 21 nm process technology. The company is also stating that GDDR6 will have a 10% lower operating voltage than GDDR5, though they don't specify if that's relative to the low voltage (1.35 V), standard (1.5 V) or high frequency (1.55 V) version of GDDR5.
What is noteworthy is that SK Hynix does disclose some details about the first graphics cards to use its GDDR6 memory. As it appears, that adapter will have a 384-bit memory bus and will thus support memory bandwidth upwards of 768 GB/s. Given the number of chips required for a 384-bit memory sub-system, it is logical to assume that the card will carry 12 GB of memory. SK Hynix is not disclosing the name of its partner among GPU developers, but it is logical to assume that we are talking a high-end product that will replace an existing graphics card.
Unlike GDDR5X, GDDR6 is expected to be manufactured by all three major DRAM makers, and consequently should be available more widely. SK Hynix believes that GDDR6 will supplant both GDDR5 and GDDR5X relatively quickly. Nonetheless, keep in mind that while it took GDDR5 a relatively short amount of time to replace GDDR4 on high-end graphics cards in 2008 – 2009, it then took the memory standard years to replace GDDR3 on mainstream adapters.