Micron, who has been at the forefront in graphics memory production, has recently announced in a blog post their commitment to achieving ever increasing speeds and performance gains with their products (which isn't all that uncommon.) What this announcement has that better carves it as different and newsworthy, though, is that the company has seemingly achieved 16 Gbps speeds on GDDR5X memory - which up to now, ticked at up to 12Gbps. Some NVIDIA cards you probably know about actually had their GDDR5X memory clocked up to 12.4 Gbps.
The new achievements under GDDR5X will aid the company in better executing their vision for GDDR6 and its speed goals. Micron expects to have functional silicon of their G6 program very soon, being confident they can push products to market on early 2018. GDDR6 will bring some specific differences in regards to GDDR5X, such as dual-channel memory (GDDR5X is single-channel) and the introduction of a FBGA180 ball package with increased pitch, to accommodate these fundamental differences.
Source:Micron Announces 16 Gbps Memory Speeds Achieved Over GDDR5X | techPowerUp