AMD: Southern Islands (7*** series) Speculation/ Rumour Thread

Discussion in 'Architecture and Products' started by UniversalTruth, Dec 17, 2010.

  1. LordEC911

    Regular

    Joined:
    Nov 25, 2007
    Messages:
    875
    Likes Received:
    205
    Location:
    'Zona
    Look who decided to take some time off from the PC Games section and join us...
     
  2. neliz

    neliz GIGABYTE Man
    Veteran

    Joined:
    Mar 30, 2005
    Messages:
    4,904
    Likes Received:
    23
    Location:
    In the know
    What, Scali is back? :p

    Edit: yeah, I guess it's that time of the year again. :)
     
  3. flopper

    Newcomer

    Joined:
    Nov 10, 2006
    Messages:
    150
    Likes Received:
    6
  4. neliz

    neliz GIGABYTE Man
    Veteran

    Joined:
    Mar 30, 2005
    Messages:
    4,904
    Likes Received:
    23
    Location:
    In the know
  5. rpg.314

    Veteran

    Joined:
    Jul 21, 2008
    Messages:
    4,298
    Likes Received:
    0
    Location:
    /
    Finally...... the leaks begin.

    Fake, imo.
     
  6. TKK

    TKK
    Newcomer

    Joined:
    Jan 12, 2010
    Messages:
    148
    Likes Received:
    0
    Definitely.

    All 'specs' that tout Thames as mid-range desktop are fake by default, because with 99.99% certainty Thames is just the mobile version of Lombok.
     
  7. Ninjaprime

    Regular

    Joined:
    Jun 8, 2008
    Messages:
    337
    Likes Received:
    1
    Totally fake. There is no reason to do a major shift to XDR2 when theres plenty of headroom left in GDDR5.
     
  8. RobertR1

    RobertR1 Pro
    Legend

    Joined:
    Nov 2, 2005
    Messages:
    5,841
    Likes Received:
    1,276
    I am more than happy to be wrong in this case :smile:
     
  9. hkultala

    Regular

    Joined:
    May 22, 2002
    Messages:
    296
    Likes Received:
    38
    Location:
    Herwood, Tampere, Finland
    What "plenty of headroom" do you mean?

    Making memory wider is expensive. And ATI/AMD does not seem to like non-power-of-2 memory bus widths. And there is 7 GHz(data rate) GDDR5 available, but that's not much more than the 5.5 GHz(data rate) 6970 currently has.
     
  10. fellix

    Veteran

    Joined:
    Dec 4, 2004
    Messages:
    3,537
    Likes Received:
    496
    Location:
    Varna, Bulgaria
    XDR2 will be really nice, but it's too good and way too expensive to be true. On the other hand, the micro-threading feature in XDR2 can really help a lot to speed up a wide range of GPGPU code.
    Meh, it's just a dream!
     
  11. Ninjaprime

    Regular

    Joined:
    Jun 8, 2008
    Messages:
    337
    Likes Received:
    1
    Theres ~28% headroom without even changing the memory controller, and they could easily up the bus to 384 bit and have nearly 100% headroom, if they needed it. Thats probably enough for two generations/years.
     
  12. Man from Atlantis

    Regular

    Joined:
    Jul 31, 2010
    Messages:
    937
    Likes Received:
    780
    opps my bad i just get up and saw the rumours wanted to share.. next time i'll be more careful :(
     
    #732 Man from Atlantis, Sep 5, 2011
    Last edited by a moderator: Sep 5, 2011
  13. Kaotik

    Kaotik Drunk Member
    Legend

    Joined:
    Apr 16, 2003
    Messages:
    10,045
    Likes Received:
    4,260
    Location:
    Finland
    Already posted + fake
    And Thames isn't even desktop chip, it's laptop.
     
  14. g__day

    Regular

    Joined:
    Jun 22, 2002
    Messages:
    580
    Likes Received:
    2
    Location:
    Sydney Australia
    Any rumours on when the next range of wonder cards are expected to arrive?

    Matt
     
  15. turtle

    Regular

    Joined:
    Aug 20, 2005
    Messages:
    279
    Likes Received:
    8
    Obviously the XDR2 rumors (which last time I checked no one had signed on to create even though the spec has been around FOR YEARS because everyone hates Rambus) and this conversation are dancing around a question that doesn't have an easy answer. That is, if the mid-range part is 256-bit with ~5ghz, how does a higher-end part approx double that?

    1. 256-bit XDR2 (erm...)
    2. 384-bit @ ~7gbps
    3. 512-bit @ 5gbps


    While I agree 384-bit makes both the most sense considering the up-to-now AMD strategy of ramping voltage/clockspeeds in place of physical logic, it seems the least likely considering they have no precedence in using odd buses. I also think it makes sense because of the 1.5/3GB configuration options considering the most-used resolution and what it requires, which could help cut costs, not-to-mention 6/12x6-7gbps @ 1.5v on paper sounds better than 8/16x4-5gbps @ 1.35v. OTOH, voltage on 28nm HP is 1.05v, and HLP (if that rumor is true) 1v flat, down from the 1.2v of virtually every other process they've used up to this point (not counting the 1.3v spec they helped create and used on 55nm), close/identical to the nVIDIA standard 1v operating voltage across all those same processes (and they'll probably use again.) In other words, they may not have that option this go-round, and may be forced to use more logic and have larger dies than we've seen since RV670 to remain competitive. Therefore, a larger bus may make sense.

    I imagine we're all on the same page with what nVIDIA's likely to do with Kepler and the GF104/114 refresh, why wouldn't AMD go this route? Just because of R600?

    While increasing the number of memory controllers is expensive, so is increasing their speed. Recalling Anand's Barts review, AMD mentioned that the Cypress controller was around twice the size of Redwood (article expounds they mean per controller...obviously one is 128-bit, the other 256-bit) which sounds like a dramatic decrease in returns for a 15% gain. One could imagine then what it would take to run a controller at around 7Gbps. In essence, that statement is an admittance that more controllers running at a lower speed (ala Barts) IS a good option.

    Now, granted, 512-bit would mean a large chip...and 28nm is immature. I think it's the consensus though the largest chip will come later, sometime in 2012, and what we'll get for 2011 is a Cypress replacement. Hence, it's at least plausible.

    One could go on and on and run circles around each option. That opinion could be tainted on wither you believe the mid-range will be a 192-bit chip as DH originally posted and Charlie omitted regarding mobile variations, or rather still a 256-bit chip (that DH had pegged further out into 2012, and Charlie's mobile chart included). At this point, considering 192-bit could be seen as a step backwards from Barts, I'm inclined to believe the mid-range is 256-bit.

    I'm not making a definitive argument for 512-bit, but it makes just as much sense as 384-bit when considering the known variables which I'm aware...and a hell of a lot more than XDR2 afaik. No one seems to mention it though...so I thought I would :)
     
  16. GZ007

    Regular

    Joined:
    Jan 22, 2010
    Messages:
    416
    Likes Received:
    0
    256-bit XDR2 at just 625 MHz base clock would be equal to 640 GB/s. :roll:
     
  17. Squilliam

    Squilliam Beyond3d isn't defined yet
    Veteran

    Joined:
    Jan 11, 2008
    Messages:
    3,495
    Likes Received:
    114
    Location:
    New Zealand
    Actually my guess is on die cache rather than increasing RAM bandwidth. Hasn't there been a trend towards increasing bandwidth efficiency faster than actual delivered bandwidth?
     
  18. Jawed

    Legend

    Joined:
    Oct 2, 2004
    Messages:
    11,481
    Likes Received:
    1,841
    Location:
    London
    Seems like it to me.
     
  19. Gipsel

    Veteran

    Joined:
    Jan 4, 2010
    Messages:
    1,620
    Likes Received:
    264
    Location:
    Hamburg, Germany
    The nominal voltage of the 28HP process is just 0.85V (40G has 0.9V but AMD as well as nv used to "overdrive", which is said to be problematic on TSMCs 28nm gate last process).
     
  20. Kaotik

    Kaotik Drunk Member
    Legend

    Joined:
    Apr 16, 2003
    Messages:
    10,045
    Likes Received:
    4,260
    Location:
    Finland
    At least some of the cards from HD7 series this year
     
Loading...

Share This Page

  • About Us

    Beyond3D has been around for over a decade and prides itself on being the best place on the web for in-depth, technically-driven discussion and analysis of 3D graphics hardware. If you love pixels and transistors, you've come to the right place!

    Beyond3D is proudly published by GPU Tools Ltd.
Loading...