GPU RAM Bit Rate

GPU RAM Bit Rate

Chip Type	Module Type	Memory Clock	Transfers/second	Bandwidth	Bandwidth
DDR	64 lanes	350 MHz	0.7 GT/s	44.8 Gbit/s	5.6 GB/s
DDR2	64 lanes	250 MHz	1 GT/s	64 Gbit/s	8 GB/s
GDDR3	64 lanes	625 MHz	2.5 GT/s	159 Gbit/s	19.9 GB/s
GDDR4	64 lanes	275 MHz	2.2 GT/s	140.8 Gbit/s	17.6 GB/s
GDDR5	64 lanes	625–1125 MHz	5–9 GT/s	320–576 Gbit/s	40–72 GB/s
GDDR5X	64 lanes	625–875 MHz	10–12 GT/s	640–768 Gbit/s	80–96 GB/s
GDDR6	64 lanes	875–1125 MHz	14–18 GT/s	896–1152 Gbit/s	112–144 GB/s
GDDR6X	64 lanes	594–656 MHz	19–21 GT/s	1216–1344 Gbit/s	152–168 GB/s
HBM	1024 lanes (8 channels @ 128 lanes ea)	500 MHz	1 GT/s	1024 Gbit/s	128 GB/s
HBM2	1024 lanes (8 channels @ 128 lanes ea)	1000 MHz	2 GT/s	2048 Gbit/s	256 GB/s
HBM2e	1024 lanes (8 channels @ 128 lanes ea)	1800 MHz	3.6 GT/s	3686.4 Gbit/s	460.8 GB/s
HBM3	1024 lanes (16 channels @ 64 lanes ea)	3200 MHz	6.4 GT/s	6553.6 Gbit/s	819.2 GB/s
HMC	128 lanes (8 links @ 16 lanes ea)	(internal)	10 GT/s	2560 Gbit/s	320 GB/s
HMC2	64 lanes (4 links @ 16 lanes ea)	(internal)	30 GT/s	3840 Gbit/s	480 GB/s