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Radeon HD 7900 Series to Use XDR2 Memory?

Discussion in 'News' started by btarunr, Sep 12, 2011.

  1. btarunr

    btarunr Editor & Senior Moderator Staff Member

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    AMD's next-generation enthusiast graphics processor (GPU) is shaping up to be something more unique than expected. The GPU codenamed "Tahiti" is going to be bleeding-edge in terms of its feature-set. To begin with, there's talk that it will make use of PCI-Express Generation 3 (Gen 3) system bus, which will give it a mammoth 32 GB/s of system interface bandwidth. Next, Tahiti will use a number-crunching architecture that's a generation ahead of even the VLIW4 it released with Cayman. VLIW4 will make up for most of the HD 7000 series, but not the top-end Tahiti GPU, it will use what AMD is referring to as "CoreNext Architecture", which is expected to boost performance per square millimeter die area beyond even what VLIW4 manages.

    The most recent piece of information is bound to shock and awe. Tahiti, it appears, will use the XDR2 memory interface. XDR2 is an ultra-high bandwidth and power-efficient memory bus that's competitive with GDDR5, maintained by Rambus, which is claimed by it to be a generation ahead of GDDR5. It's not like XDR2 will be exotic to AIBs, the XDR architecture is used in game consoles where the high-bandwidth offsets low memory capacity by allowing quick streaming of texture data. Rambus licenses XDR memory chip manufacture to notable high-volume vendors. Nordic Hardware compiled data from various unreliable sources to sketch out what Radeon HD 7900 series could look like.

    [​IMG] [​IMG] [​IMG]

    Source: NordicHardware
    damric, NAVI_Z, cadaveca and 2 others say thanks.
  2. halfwaythere New Member

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    Good job recycling last weeks news.
    damric and El_Mayo say thanks.
  3. btarunr

    btarunr Editor & Senior Moderator Staff Member

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    Thanks.
  4. eidairaman1

    eidairaman1

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    I think it would be best idea to release the XDR2 on lower models first n compare GDDR5 to XDR2 models.
  5. BernardV New Member

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    Legit?

    [​IMG]
  6. NC37

    NC37

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    Well I didn't catch it. Thanks from me!
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  7. Roph

    Roph

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    Ugh, please don't help rambus survive :(
    TheGuruStud and v12dock say thanks.
  8. eidairaman1

    eidairaman1

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  9. csendesmark

    csendesmark

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    Can't be true
  10. xenocide

    xenocide

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    It says in the initial post that was speculation using projections.
  11. Frick

    Frick Fishfaced Nincompoop

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    Why not? If they make good memory why not use it?
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  12. hat

    hat Maximum Overclocker

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    If that turns out to be true, then it seems to me that they haven't really made any true performance improvements since the 5 series, and have yet again mostly "compressed" it down to get roughly similar performance with lower power consumption and heat output. I guess that's not all bad... the 5870 is still a hell of a raw performance card, and these will be too, but with power and heat improvements. Meanwhile, Nvidia will push further with cards with marginally more performance than the last generation while grappling with power consumption and heat output issues. This seems a more likely story than all the good stuff supposedly happening in the OP...
    Crunching for Team TPU
  13. Syborfical New Member

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    When PC's used rambus the licensing fees etc made it cost at least 4 times more the DDR at the time.

    Rambus in PC's was short lived due to the high price and having to pay a high licensing fees, plus it had high latency compared to SDR and generated lots of heat.

    So going from past products XDR may or may not be the same.
  14. Red_Machine

    Red_Machine

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    But... we've already has a 7950...
  15. entropy13

    entropy13

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    From Nvidia.

    There has been a Radeon 7500 already though.
  16. HalfAHertz

    HalfAHertz

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  17. RejZoR

    RejZoR

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    But not HD7500... Besides, AMD is not using whole numbers anymore so yo won't see Radeon 7500. It Will be HD7530 or HD7550 or HD7570 etc...
  18. Frick

    Frick Fishfaced Nincompoop

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    As you say that was some time ago. They've not been very succesful after that (afaik) so maybe they have learned their lesson.

    And if it's already in use in some consoles (is it PS3?) it's already on.
  19. Recus

    Recus

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  20. Hayder_Master

    Hayder_Master

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    Make it with 512bit and let me forget upgrad the gpu for 3 years.
    Bundy says thanks.
  21. RejZoR

    RejZoR

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    512bit bus is very expensive so don't expect it at all...
    Isenstaedt says thanks.
  22. the54thvoid

    the54thvoid

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    From source
    I like when people make such statements. It means in Q1 2012 we can look back and say:

    a) Look, CD was right, so there! or
    b) Look, CD was wrong, so there!
  23. Completely Bonkers New Member

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    I don't mind waiting for this... and nV's next generation... so long as they can achieve the same performance at half the power consumption. Let's hope there is a 28nm 7770 with same performance of 6770 at half power. Or actually, even better would be speed bump of 33% whilst reducing power 33%. Or a GTX 660 with a speed bump of 33% whilst reducing power 33%. Current cards are too hot and too thirsty IMO. If I look back 10 years, then CPU power/performance ratios have improved better than GPUs, and that needs to be fixed.
  24. KooKKiK New Member

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    GTX285 is also 512 bit and it is fucking slow like hell now. ;)
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  25. Bundy

    Bundy

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    Yes! More copper please.

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