DDR

DDR = Double Data Rate

Slot & Channel

正常情況: two slots per channel when they are run in dual-channel mode.

slots <= channel x 2

Win10 Checking

"Task Manager" > Performance Tab > Memory Section

• Speed (i.e. 3200 MHz)
• Slots userd (i.e. 1 of 4)    # wmic memphysical get MaxCapacity, MemoryDevices

GDDR5x

GDDR5X targets a transfer rate of 10 to 14 Gbit/s per pin, twice that of GDDR5.

Essentially, it provides the memory controller the option to use either a double data rate mode that has a prefetch of 8n,

or a quad data rate mode that has a prefetch of 16n.

GDDR5 only has a double data rate mode that has an 8n prefetch. GDDR5X also uses 190 pins per chip.

By comparison, standard GDDR5 has 170 pins per chip.

https://www.anandtech.com/show/10325/the-nvidia-geforce-gtx-1080-and-1070-founders-edition-review/7