GDDR5 memory

Does anyone have any more info on the GDDR5 memory being used in the 4870? It seems to be running on a 900MHz clock with 3600MHz data rate, ie quad pumped, how is this - or have ATI sent a large cheque to Rambus to license some sort of XDR technology...
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  1. jamesgoddard said:
    Does anyone have any more info on the GDDR5 memory being used in the 4870? It seems to be running on a 900MHz clock with 3600MHz data rate, ie quad pumped, how is this - or have ATI sent a large cheque to Rambus to license some sort of XDR technology...


    This is my understanding of it, based on tidbits I've gleaned:

    ATI/AMD and their partner developed the GDDR4 and GDDR5 standards. This is probably why Nvidia hasn't moved to the GDDR4/5 standards... either ATI refuses to license the technology to them, or Nvidia refuses to purchase.

    Yes, it is quad pumped, which is a cheaper solution than upgrading to a 512 bit memory bus for theoretically the same bandwidth performance. Also, when GDDR5 starts heavier production, it should be cheaper to manufacture than the prior GDDR levels, giving a further advantage to ATI in any price wars the competition may consider.
  2. Here you go james this should answer any questions you have.
    http://www.extremetech.com/article2/0,2845,2309870,00.asp
    Mactronix :)
  3. Good article!
  4. The other thing is I thin it's not quad pumped the way that DDR is double pumped / dual data rate.

    From my understanding it's two 32bit words simultaneously at 8 bit per pin (instead of the one of GDDR2/3/4 at 4 bit per pin) and then double pumped.
  5. That would be my understanding of it also TGGA. I have read a couple of articles on it but that one was the best i have seen in my view. I would call it Quasi Quad Data Rate :D
    Mactronix
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