HD 4870 review thread.

Discussion in '3D Hardware, Software & Output Devices' started by mczak, Jun 24, 2008.

  1. Slyne

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    4850 or 4870 or both?
    What about power consumption?
     
  2. frameavenger

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  3. AlexV

    AlexV Heteroscedasticitate
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    Edit: scratch that, the 4850 samples have a bios that has the clocking profile properly set, but other bioses I've seen have 500 750 as clocks for 2D for some reason. Sorry for the mixup.
     
    #123 AlexV, Jun 26, 2008
    Last edited by a moderator: Jun 26, 2008
  4. Mark

    Mark aka Ratchet
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  5. Slyne

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    I am starting to think that aggressive power optimizations were detrimental to performance for the current batch of BIOS/drivers, so they were removed for press day, and will be reintroduced later, once perf issues are ironed out.

    Well, I hope they'll eventually show up; otherwise, I just purchased a new heater.
     
  6. Humus

    Humus Crazy coder
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    Interesting. Dynamic branching performance seems to be improved a lot. Has the granularity been improved or does anyone know what kind of improvements were done? Or is it mostly an effect of more horsepower under the hood compared to HD3870?
     
  7. swaaye

    swaaye Entirely Suboptimal
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    Yup. I think it's almost worth considering a slower card for the convenience of NV's automatic application profiles.
     
  8. ShaidarHaran

    ShaidarHaran hardware monkey
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    LOL! Hey, why not pay more for that card while you're at it?

    Yes, application profiles are sorely lacking in CCC. Radeon 4x00 is still the best bang for buck GPU family on the planet, and something as relatively small as a missing control panel feature is by no means a reason not to buy one.
     
  9. shiznit

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    Don't get me wrong, I'm buying a 4870 the day a 1GB version comes out. I was just suggesting better use of ATI's driver programmers' time than optimizing for games very few people play as opposed to key features every owner would use all the time.
     
    #129 shiznit, Jun 27, 2008
    Last edited by a moderator: Jun 27, 2008
  10. ShaidarHaran

    ShaidarHaran hardware monkey
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    It was swaaye's post I responded to. We are in agreement.
     
  11. shiznit

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    No worries, I was just clarifying.

    Do you guys think a 1GB version will be less than $400?
     
  12. AlphaWolf

    AlphaWolf Specious Misanthrope
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    I can't see MSRP being $100 more for the 1GB version.
     
  13. AlexV

    AlexV Heteroscedasticitate
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    Branch granularity is same 64-pixels.
     
  14. Pete

    Pete Moderate Nuisance
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    Some nicely-presented benchmarks at ChileHardWare, focused on just the 4850, 4870, 9800GTX, and GTX260.
     
  15. ShaidarHaran

    ShaidarHaran hardware monkey
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    So is the observed increase in branching performance due to the increase in SP count, or some architectural change such as the organization of the SIMDs?
     
  16. ShaidarHaran

    ShaidarHaran hardware monkey
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    I wasn't going to read that review but now that I know they've focused on the RIGHT cards for comparison, I will do so with great pleasure.
     
  17. Jawed

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    Dynamic branching, like texturing, consumes hardware threads - i.e. additional threads are required to hide DB latency.

    The texture cache system in RV770 seems to be more efficient than RV670, so maybe what we're seeing is that less hardware threads are being consumed by texturing latency. This then leaves more threads available to be consumed by dynamic branching.

    Just a guess...

    Jawed
     
  18. ShaidarHaran

    ShaidarHaran hardware monkey
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    Ya know, I had a feeling the chance in cache size(s) had some hand in this, but I didn't directly associate texture cache with DB perf.
     
  19. Mintmaster

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    It looks like they corrected something that went wrong in RV670:
    http://www.xbitlabs.com/articles/video/display/radeon-hd3870-hd3850_16.html#sect0

    For some reason RV670 does substantially worse in the DB tests than R600.

    What's really amazing is how well RV770 does in some of the texture limited tests, which are loosely identifiable as those where G80 thrashed R600.
     
    #139 Mintmaster, Jun 27, 2008
    Last edited by a moderator: Jun 27, 2008
  20. ShaidarHaran

    ShaidarHaran hardware monkey
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    I believe the creator of that test stated recently it is far too out-dated to be considered a reliable gauge of the texturing performance of modern graphics processors, but perhaps that was another fillrate test and my recollection is poor.
     
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