Then divide by 8 gives us 1008384 MB/s. Similarly for the GTX 1070 which uses older GDDR5 memory: Memory clock: 2002MHz We now have a mainstream, dual-channel platform capable of generating nearly as much memory bandwidth as last generation's quad-channel. DDR3 memory chips come in different specs depending on their speed. EarthDog said: Its DOUBLE DATA RATE and Quad pumped. for GDDR5 (obsolete) the bitrate could be anything between 5 and 9 Gbps. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. [quotemsg=17598495,0,125865]The memory clock for DDR3-1600 is 800Mhz, the data transfer rate is 2x due to DDR, the memory controller data path width to the DIMM is 64bits wide, which yields 800MHz x 2 x 64bits = 102.4Gbps or 12.8GB/s. Now able to calculate both system and GPU bandwidth. PDF Lecture 6: DRAM Bandwidth - University of California, Riverside View Details Launch Part Catalog. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Sign in here. PC3200 is backward-compatible for PC1600, PC2100, and PC2700. In a dual-channel mode configuration, this is effectively a 128-bit width. Look at the memory specs instead (links in question above) Both are specified as "6gbps" meaning 3GHz * 2 (because DDR), "quad-pumped" buses that deliver four bits per tick, but I haven't heard of the latter being used on graphics cards => Look at PAM4 signaling over GDDR6X, How to get memory bandwidth from memory clock/memory speed, https://www.goldfries.com/computing/gddr3-vs-gddr5-graphic-card-comparison-see-the-difference-with-the-amd-radeon-hd-7750/, How a top-ranked engineering school reimagined CS curriculum (Ep. The naming convention for DDR, DDR2 and DDR3 modules specifies either a maximum speed (e.g., DDR2-800) or a maximum bandwidth (e.g., PC2-6400). For double-data-rate memory, the higher the number, the faster the memory and higher bandwidth. Because the hertz is a measure of cycles per second, and no signal cycles more often than every other transfer, describing the transfer rate in units of MHz is technically incorrect, although very common.
