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GDDR5X FAQs

GDDR5X(7)
How does Graphics DRAM differ from regular DRAM?
Graphics DRAM is a category of DDR SDRAM designed to handle very large bandwidth requirements. Unlike standard DRAM, graphics DRAM is typically soldered down on the same PCB as the SoC and always supports 32 DQs per memory component. Besides graphics cards and game consoles, graphics DRAM is being used in high-bandwidth applications like networking, automotive and high-performance computing.
What features and functions does GDDR5X have compared to previous generations of Graphics DRAM?
GDDR5X provides higher densities and lower external voltage (1.35V) compared to its predecessor, GDDR5. GDDR5X also doubles the bandwidth (10–16 Gb/s) of GDDR5 while remaining on traditional discrete package technology (FBGA).
Can GDDR5X operate in GDDR5-like mode?

Yes, GDDR5X has two operation modes:

  • QDR mode: Supports speeds of 10 Gb/s and above
  • DDR mode: Supports 0.2–6 Gb/s speeds and is compatible with GDDR5
Does GDDR5X support JTAG boundary scan?
Yes, GDDR5X has IEEE 1149.1 compliant boundary scan.
What is Micron’s competitive position with GDDR5X?
Micron is the first memory supplier in the industry supporting GDDR5X in mass production.
Is GDDR5X a JEDEC standard?
Yes, the GDDR5X SGRAM standard was first published in Dec. 2015 as JESD232. The latest JEDEC release is JESD232A.
Does GDDR5X replace GDDR5?
GDDR5X is not a direct replacement for GDDR5 due to package size differences. GDDR5 has a 170-ball, 0.8mm-pitch BGA package while GDDR5X has a 190-ball, 0.65mm-pitch package.