Sakkura :
Sigh... the GDDR5 used in graphics card is a modified version of DDR3 memory. DDR4 is newer and more advanced than GDDR5. Most likely they'll later develop a GDDR6 based on DDR4.
Neither is really more "advanced" than the other. The fundamental DRAM structure has not changed in 20+ years and all SDR/DDR/GDDR 1/2/3/4/5/etc. do is tweak the front-end and addressing structure that manages access to the storage matrix. This is a large part of the reason why you can buy DIMMs that pack over 65 billion transistors (8GB) for less than $60.
Most improvements in DRAM are closely related to silicon process improvements and new DRAM standards simply tweak things some more to account for that... one extra register here, another one there, trading extra latency cycles for higher bandwidth. None of the "new standards" make any major technical improvements on previous versions of the same. What are the differences between DDR1 and DDR4? Minimum clock rates and chip densities have been increased by 8X, min/max latency has been increased by ~7 cycles, operating voltages have dropped to follow process shrinks... nothing particularly noteworthy.
Since the first step of designing a GDDR5 DRAM is ripping out just about everything that made the DRAM matrix comply with the DDR2/3 spec to replace it with GDDR5-specific variants, GDDR5 cannot really be called a "derivative" from DDR2/3... it does not reuse anything that specifically belonged to DDR2/3, just the generic DRAM matrix that can be turned into anything (DDR1/2/3/4, GDDR1/3/5, eDRAM, XDR, etc.) depending on what you wrap it with.
If I had to say DDRx/GDDRx were derived from something, I would say they are derived from PC66 SDRAM: PC66 introduced synchronous logic in DRAM's internal structures along with synchronous IO and nearly all changes since then have been about adding more of that for pipelining to accommodate faster clocks; more aggressively so on the GDDR front. DDR and GDDR are relatively minor tweaks by comparison.