Difference between DDR2/3/5 on a video card

[Bill16857]

i've been looking at video cards and they all say ddr2 ddr3 or ddr5 what does it mean?

 

[Jamin43]

Generally speaking ( in terms of RAM for PC's )
* DDR2 is twice as fast as DDR
* DDR3 is twice as fast as DDR2
* I'm assuming you can keep moving forward on that double ratio ( although DDR 4 & 5 is only available in Video cards from what I've seen )

DDR5 as a Memory is faster to access than DDR2 & 3

 

[Gooberman]

yeah but don't you get higher latency when it gets higher? like DDR2 - DDR3 people always fight about that crap this is something I read

Now the Bus Width is 128 bits(for this), convert that to bytes. Since 8 bits = 1 bytes, you do 128/8 and you get 16 bytes. Now multiply 800 mhz x 16 bytes = 12,800 = 12.8 GB/s

Do the same thing for the GDDR3 memory type:
Clock speed: 700 mhz x 2 = 1400 mhz x 16 bytes = 22,400 = 22.4 GB/s

this is for video cards