1. Welcome to TechPowerUp Forums, Guest! Please check out our forum guidelines for info related to our community.

AMD Denies Hidden GCN CUs in Tahiti

Discussion in 'News' started by btarunr, Jan 5, 2012.

  1. btarunr

    btarunr Editor & Senior Moderator Staff Member

    Joined:
    Oct 9, 2007
    Messages:
    28,869 (11.07/day)
    Thanks Received:
    13,716
    Location:
    Hyderabad, India
    Over the past few days, we were hearing rumors from many quarters that AMD's "Tahiti" high-performance GPU may have been a deviation from an older specification, and that it really has 2304 stream processors spread across 40 GCN compute units (CUs), instead of the 32 the Radeon HD 7970 ended up with. Both AMD and NVIDIA create more redundant components on their chips than their SKUs end up getting, so they could increase yields, it's a process commonly known as "harvesting".

    On Tuesday, AMD quashed the rumor in an e-mail to Bright Side of News, in which it said that Tahiti XT (Radeon HD 7970) makes use of all the CUs there are, on the chip. The 40 CU / 2308 SP rumor gained some weight with the fact that since AMD is venturing into unknown territory (TSMC's 28 nm process, built after quite some delays and failures), it could do some heavy harvesting. Examples of harvesting in recent past include Intel Sandy Bridge-E Core i7 processors, which use only up to 6 out of 8 cores on the silicon, and only up to 15 MB out of 20 MB available on it; and GeForce GTX 480, which used only 480 out of 512 CUDA cores available on the GF100 GPU.

    [​IMG]

    Source: Bright Side of News
     
    Last edited: Jan 5, 2012
  2. Delta6326

    Delta6326

    Joined:
    May 21, 2008
    Messages:
    3,840 (1.61/day)
    Thanks Received:
    670
    Location:
    Iowa, USA
    Dude if I could "unlock" a 7970 to a even higher power than that would be insane! Only time will tell. About 4 days.
     
    hellrazor says thanks.
  3. FreedomEclipse

    FreedomEclipse ~Technological Technocrat~

    Joined:
    Apr 20, 2007
    Messages:
    13,942 (5.02/day)
    Thanks Received:
    2,367
    Nothing like bad PR to boost pre-release sales. If this is true then AMD have really let themselves and all their loyal fan boys down
     
  4. Damn_Smooth

    Damn_Smooth New Member

    Joined:
    May 16, 2011
    Messages:
    1,435 (1.11/day)
    Thanks Received:
    478
    Location:
    A frozen turdberg.
    How so? I am more than happy with the way the card performs already.
     
  5. tigger

    tigger I'm the only one

    Joined:
    Mar 20, 2006
    Messages:
    10,183 (3.21/day)
    Thanks Received:
    1,399
    At the moment this card is getting nothing but good PR from its oc'ing prowess.
     
  6. 1Kurgan1

    1Kurgan1 The Knife in your Back

    Joined:
    Dec 8, 2008
    Messages:
    10,331 (4.74/day)
    Thanks Received:
    2,374
    Location:
    Duluth, Minnesota
    And here comes the trolls, you must be bad at reading, NV did this with their 480's... Move along :laugh: They will let all their loyal fans down with a card thats faster than a 580, cheaper than a 580, and overclocks like a beast? Doesn't sound like a let down to me, no matter if the card has hidden stream processors or not.
     
    digibucc says thanks.
  7. Lionheart

    Lionheart

    Joined:
    Apr 30, 2008
    Messages:
    4,071 (1.69/day)
    Thanks Received:
    824
    Location:
    Milky Way Galaxy
    Meh, just gimme on already, I miss PC gaming ~_~
     
  8. v12dock

    v12dock

    Joined:
    Dec 18, 2008
    Messages:
    1,611 (0.74/day)
    Thanks Received:
    321
    I think the overclocking results are speaking for them self
     
  9. Horrux

    Horrux

    Joined:
    Jun 2, 2011
    Messages:
    735 (0.58/day)
    Thanks Received:
    124
    I think it smells of harvesting, yes. But whatever, why should anyone care?
     
    1Kurgan1 says thanks.
  10. ZoneDymo

    ZoneDymo

    Joined:
    Feb 11, 2009
    Messages:
    423 (0.20/day)
    Thanks Received:
    70
    Loyal fan boys...
    Has anyone ever heard about a fan boy being disloyal?
     
  11. FreedomEclipse

    FreedomEclipse ~Technological Technocrat~

    Joined:
    Apr 20, 2007
    Messages:
    13,942 (5.02/day)
    Thanks Received:
    2,367
    meh...I had just got out of bed after about 4hrs sleep when i made that post :toast: totally proud that i managed to piss off so many people with it :cool::cool:

    Its bad because they are lying to the consumer. Its like saying a car has a 5Ltr turbo charged engine underneath the hood but it really has a 1.8Ltr Diesel. The performance is still good so it doesnt really matter. it just depends how you look at it
     
  12. DaMobsta New Member

    Joined:
    Dec 21, 2011
    Messages:
    33 (0.03/day)
    Thanks Received:
    9
    WTF are you saying? You need to get back to your bed ASAP
     
    digibucc and 1Kurgan1 say thanks.
  13. Damn_Smooth

    Damn_Smooth New Member

    Joined:
    May 16, 2011
    Messages:
    1,435 (1.11/day)
    Thanks Received:
    478
    Location:
    A frozen turdberg.
    AMD never claimed that it had more stream processors. The only thing that did was some "leaked document" from Sapphire. I don't know how you consider AMD clarifying that the document was wrong to be deceitful in any way.
     
    Jizzler, H82LUZ73 and 1Kurgan1 say thanks.
  14. 1Kurgan1

    1Kurgan1 The Knife in your Back

    Joined:
    Dec 8, 2008
    Messages:
    10,331 (4.74/day)
    Thanks Received:
    2,374
    Location:
    Duluth, Minnesota
    Thats a horrible comparison. Because, with a card, if they say it brings X power and it brings X power, it is what it is. With a car, if they say a 5.0 Turbo and they give you a 1.8 TD, it most likely isn't making the same power (unless it's strung out to all hell). Not to mention vehicles weight makes a massive difference. The scenario you listed is, they list the specs and then give you less when you buy it, not in the least bit the samething.

    They released the specs for the card, they weren't lying to anyone, they didn't say it came with X amount then it ended up being under that amount. And beyond that, have you been watching the news articles over the last week? The 7970's just set world records, not only for bench scores, but for clock speeds. They OC to an insane level, even on air I think what 400mhz OC's on the GPU? Thats a ton of performance just sitting there for free. Plus now they dropped the price.

    You are making it too complicated, what it comes down to for hardware is the performance for the price. And the 7970 brings that, despite if it has things locked or not, and if you decide to OC, tack another 20 - 30% performance on for free (how could anyone complain about that?). Of course your previous post made people respond, it was made without any thought.
     
    robn and Damn_Smooth say thanks.
  15. DaMobsta New Member

    Joined:
    Dec 21, 2011
    Messages:
    33 (0.03/day)
    Thanks Received:
    9
    Chill dudes, he's just trolling lol
     
  16. H82LUZ73

    H82LUZ73

    Joined:
    Mar 26, 2008
    Messages:
    1,787 (0.73/day)
    Thanks Received:
    268
    Location:
    Cobourg,Ontario
  17. pantherx12

    pantherx12 New Member

    Joined:
    Jan 2, 2009
    Messages:
    9,714 (4.51/day)
    Thanks Received:
    1,699
    Location:
    ENGLAND-LAND-LAND

    How so man?

    If they said they had 2300 ( what ever it was) and 40 rops and it turned out to have less I could see your point, but stating they have 2000 when there is a possibility there is more is not really lying.

    It's because silicone can be a fickle thing if they shot for 2000 on the dot they would have hardly any 7970s and they'd all be 7950s.

    Pretty much every silicone devices get made with extra components to give them wiggle room :toast:

    Means if any do survive 100% they will later be sold when they have enough to distribute them.
     
  18. HTC

    HTC

    Joined:
    Apr 1, 2008
    Messages:
    2,242 (0.92/day)
    Thanks Received:
    303
    Actually, it is: we just don't care.
     
  19. pantherx12

    pantherx12 New Member

    Joined:
    Jan 2, 2009
    Messages:
    9,714 (4.51/day)
    Thanks Received:
    1,699
    Location:
    ENGLAND-LAND-LAND
    I suppose them saying the clock speed is actually 925 when it can do 1335 is lying too?

    :laugh:

    It's called guaranteed specification, yeah you may pull more out but it doesn't mean they were duping you or lying to you.

    Especially considering those extra 300 shaders probably don't even work if they do exist.

    ( which according to AMD they don't so they've probably been laser cut)


    Although I appreciate this is about semantics so no point taking it past this : ]
     
  20. HTC

    HTC

    Joined:
    Apr 1, 2008
    Messages:
    2,242 (0.92/day)
    Thanks Received:
    303
    Didn't know they had a name for that ...

    Anyway, i'm pretty sure if such a thing exists W1zzard will find it: didn't he find that instance with the ATI card that had less shaders (or whatever it had missing) a while back? I seem to recall another instance where he found nVidia using a 27-something instead of a 25-something which gave their cards an advantage as well but i really don't recall specifics.
     
  21. Widjaja

    Widjaja

    Joined:
    Jun 12, 2007
    Messages:
    4,819 (1.77/day)
    Thanks Received:
    639
    Location:
    Wangas, New Zealand
    Who cares if the card has some left over junk which is not used?
    At the end of the day, this card performs well and isn't overly expensive.
     
  22. AlienIsGOD

    AlienIsGOD

    Joined:
    Aug 9, 2008
    Messages:
    3,488 (1.52/day)
    Thanks Received:
    1,549
    I heard all this 7970 news makes ppl bitchy :p Like really guys, the card performs well and is priced accordingly. All this fanboi bitching and trolling is just jealousy because AMD has a great performing card and Kepler is MIA.
     
    Crunching for Team TPU
  23. PremoGS

    PremoGS New Member

    Joined:
    Dec 31, 2011
    Messages:
    23 (0.02/day)
    Thanks Received:
    3
    Location:
    Finland
    Did you get this card over a year ago? I got my GTX580 over a year ago. If they had made this card a year ago, it would have been something, but now, the card is worthless.
    Took the shitty company over a year to beat the GTX580 which was based on Fermi which again, is over 2 years older, what can I say? AMD = :lmao:
     
  24. theoneandonlymrk

    theoneandonlymrk

    Joined:
    Mar 10, 2010
    Messages:
    3,413 (1.98/day)
    Thanks Received:
    572
    Location:
    Manchester uk
    nah theyd put out the same power just the 5ltr one is the us version the 1.8Tdi is the uk:p

    more hidden cores my ass , as someone correctly stated elsewhere it was probably an x2 of a lower GPU that got scrapped or a total press turd to uncover a leak
     
    More than 25k PPD
  25. yogurt_21

    yogurt_21

    Joined:
    Feb 18, 2006
    Messages:
    4,439 (1.39/day)
    Thanks Received:
    590
    Location:
    AZ
    you really have a horrible defenition of bad pr.

    finding out a card that already performs better than expected could possibly be unlocked for even more performance is kinda like your wife telling you that she's baked a cake wearing a nightie and sent the kids to her mothers house for the night.

    as opposed to before where she just baked a cake.


    This if anything is amazing pr.

    the fact that the gtx 480 had more shaders that were locked didn't bother anyone. The fact that it was 6 months late, sucked more power than a microwave and put out enough heat to keep a 2000 sqft home warm in a subzero temperature winter did.
     

Currently Active Users Viewing This Thread: 1 (0 members and 1 guest)

Share This Page