RV740 Announced: Mobility Radeon HD 4830/HD 4860

Discussion in 'Architecture and Products' started by AnarchX, Mar 3, 2009.

  1. AnarchX

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    #1 AnarchX, Mar 3, 2009
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  2. sc3252

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    I just read about this on cnn. I was really surprised, since you rarely ever see a mobility part announced first. Hopefully this means I can buy a laptop with one soonish, AMD is saying Q2.
     
  3. AnarchX

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  4. Pressure

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    Interesting, I guess we won't have to wait too long to see some initial benchmarks (besides Guru3D's).
     
  5. rpg.314

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    its definitely rare that mobile parts are coming out first. But with notebooks outrunning desktops, it may become the norm in the future. 70% density increase. Well then a 1600 alu rv870 doesn't seem impossible.
     
  6. Psycho

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    I think it's pretty clear why we see the notebook announcement first. The press doesn't like soft launches for desktop cards, but it's pretty comon for notebook parts.
    And it's coming today as a major spoiler for nvidias GTX260/280M launch. If we look at Guru3D's test the 4860M will be a bit faster than the tested part and is going up against a (full) g92 at @585, ie slightly faster than the 4830/9800gt.
    Could be nice if they could add a 585mhz downclocked 9800gtx to the test :)
     
  7. Jawed

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    Awesome, all we need now is the RBE and MC configurations.

    The chip on the left appears to be RV770. If we take the indicated dimensions into account, it's 265mm2.

    Recently we discovered from GT200 that packaging the die adds 0.5mm to each dimension. Assuming the same for ATI GPUs that would make this apparent RV770 ~ 249mm2.

    So, erm, take your pick.

    For RV740 this would mean 125mm2.

    Jawed
     
  8. neliz

    neliz GIGABYTE Man
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    That's surprising news, didn't know they were going to announce it today. Guess that's what "fresh and new" brings against "old and stale."

    Now.. why did they call this 4830Mobile (which it honestly is) and not use the name of the RV740 products , or is 4860 a hint at that?

    http://blogs.amd.com/play/archive/2009/03/03/compromise-free-mobile-computing.aspx
     
    #8 neliz, Mar 3, 2009
    Last edited by a moderator: Mar 3, 2009
  9. neliz

    neliz GIGABYTE Man
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    According to the flickr page that's the 4850 "mobile"
    http://flickr.com/photos/amd_unprocessed/3323338543/
     
  10. Cookie Monster

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    Well, look at what nVIDIA is doing at the mobile GPUs. They are using G92Bs and branding them as GTX280/260M. So I think its best not to think too much about branding practices from both companies when it comes to mobile GPUs.
     
  11. Jawed

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  12. Psycho

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  13. Arun

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    Very interesting - better news that ASAP. A couple of points:
    - Jawed, I'm not sure it makes sense to remove 0.5 in this case because this isn't a real die shot; it's a marketing photo. They are more likely to have written the real die size there than what you'd measure.
    - Remember 40nm wafer prices are substantially above 65nm ones right now. Let's assume they're at $7K vs $5K; that means it costs more like a 190mm² chip on 65nm (ala RV670/G94b). Still, it does have a clear cost advantage assuming yields are decent versus G92b/RV770.
     
  14. Jawed

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    Having dug around I think you're right:

    http://www.extrahardware.cz/je-vetsi-g92b-nebo-rv770

    These measurements (even if a bit woolly) indicate that the measurements provided by AMD are die size, not packaged die size.

    G92b is clearly smaller in this comparison, about 96% the size of RV770.

    Jawed
     
  15. no-X

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    The measurement isn't minutely precise, because the clamps are touching the glue, which surrounds the core and not the core exactly, so the difference can be up-to 0.7mm.
     
  16. Lukfi

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    About that AMD official size comparison... I can't quite read what it says on RV770, but if I read it correctly (18 point something × 16 point something) that would come out to ~300 mm2, that ain't right :nope:
     
  17. Jawed

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    16.434x16.110. Your browser prolly supports Ctrl-mouse-wheel to zoom the page.

    Meanwhile I've just noticed the Mobility HD4860 has 64GB/s bandwidth:

    http://ati.amd.com/products/mobilityradeonhd4800/4860_index.html

    which is quite a bit healthier than the Guru3D engineering sample :grin: That should make it match HD4850.

    With a bit of luck the desktop part will be about the same.

    Jawed
     
  18. neliz

    neliz GIGABYTE Man
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    That's the die size of the RV770/HD4850 (16.434 x 16.110), the RV740 is 11.7 by 11.7

    full size at flickr!
    http://flickr.com/photos/amd_unprocessed/3324176030/sizes/o/ (2504x1524)

    That saves you a lot of CTRL-clicking
     
  19. DegustatoR

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    Actually ATI was doing this trick way earlier than NVIDIA even had a mobile GPU.

    Well it's called 4860. So it's better match 4850. Or even be a little bit faster. No?
     
  20. Lukfi

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    What puzzles me are the lenient HD 4830 specifications. Clock it between 450 and 600 MHz and you can call it a 4830, eh?
     
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