Poor 3D Performance from HD 3870

Discussion in 'Videocards - AMD Radeon' started by IPW, Jun 5, 2011.

  1. IPW

    IPW Member

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    GPU:
    ATI Sapphire HD 3870
    Hey folks,

    Some guidance if you can.

    I recently upgraded my Graphics Card from a GeForce 7600GT to the HD 3870.

    On the Passmark Test simple 3D test it performs really well - as expected. However, on the complex 3D test it starts at FPS of about double the 7600 GT BUT within seconds drops back to barely half what the 7600 GT was giving me.

    I am running a standard home desktop with Intel Core 2 Q8200 with a 350W PSU with 16V on the +12V rail.

    Any ideas? Thank you
     
  2. JoPa

    JoPa Member

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    You should look into buying a bigger power supply, that 350W doesn't cut it. At least 450W or more for that comp.
     
  3. IPW

    IPW Member

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    Thanks.

    Is that sort of pathetic card performance due entirely to a lack of Amps?

    You say 450W PSU. But what about specific +12V rail needs. Nowhere can I find clearly what the HD 3870 needs in that respect.

    IPW
     
  4. JoPa

    JoPa Member

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    Well i just checked and i'd say at least 26 amps for the HD 3870, but more is always better. The wattage isn't that important compared to having more amps.
     

  5. IPW

    IPW Member

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    Thanks - will look for hat capability.
     
  6. sykozis

    sykozis Ancient Guru

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    From Hilbert's Review of the HD3870 back in 2007:

    Review here: http://www.guru3d.com/article/amd-ati-radeon-3850--3870-review/8
     
  7. IPW

    IPW Member

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    Thanks. Am now looking at a 600W PSU.
     
  8. sverek

    sverek Ancient Guru

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    jesus christ, I overclock mah cpu and 4850 and I am doing fine on 375W.

    Why people scream PSU, without realizing a thing. I'd rather suggest to check heat and not to expect much from 4 generations behind video card.
     
  9. JoPa

    JoPa Member

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    Because at the beginning he said that his Power supply only has 16V on the +12V rails and as sykozis linked to Hilbert's review of the card, it says "Also recommended is 28 AMP's on the 12 volts rails for stable power distribution (on a single card configuration)".
    Of course it could be heat but my guess is the pw supply.
     
  10. IPW

    IPW Member

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    What about the heat?

    It is at about 44 idle and 70 on test.

    Surely that is OK??

    Also, my 350W power supply only has 16A on the +12V rail....
     

  11. sykozis

    sykozis Ancient Guru

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    Using a power supply that's incapable of supplying adequate power can result in pre-mature failure of components. Yes, heat is bad....but lack of adequate power is much worse.

    Yes, those temps are fine.
     
  12. IPW

    IPW Member

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    Thanks.

    I am looking at an ISONIC (Expanding Brand here in South Africa with a good reputation for lots of Computer and general consumer electronics).

    It is 600W and gives:
    16A on +3.3v, 17A on +5v, 18A on +12v1 and 19A on 12v2.

    What do you think???
     
  13. Mufflore

    Mufflore Ancient Guru

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    Buy only well reviewed PSUs from places that know how to review PSUs.
    Its a minefield, especially cheap PSUs, theres way too much crap on the market.
    Check out Jonnyguru and HardOCP, they know their stuff.
     
  14. evolucion888

    evolucion888 Master Guru

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    HD 3870 by today's standard is still able to play most games with a combination of medium+ high stuff at 1680x1050 (My exGF owned that card until a couple of weeks ago.). A good PSU is a must with every mid/high end card no matter which generation of GPU is.
     
  15. IPW

    IPW Member

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    Thanks all of you.

    I only need to display at 1280 x 1284.

    I am going to get the GIGABYTE ODIN 585 - it has two 12v rails and seems to deliver much more power that I am ever likely to need.

    Many thanks again.

    Ian
     

  16. phatpharm

    phatpharm Member

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    I run two of them on 600W fine. 860MHz clocks. (VisionTek)

    Decent OC on my i5 as well (for power consumption)
     
  17. sykozis

    sykozis Ancient Guru

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    People "scream PSU" for several reasons. Components must be properly powered to perform properly. Inadequate power can cause system instability, poor performance and premature component failure. Just because you don't mind risking your system with a low-power unit, doesn't mean others have the same desire. Fact is, while wattage is important to consider when buying a power supply, you also need to make sure the power supply can output enough amperes to feed the devices connected to it. It would be a good idea for those looking at investing in a new power supply to learn Watt's law...as it can provide a good initial understanding as to how the power ratings work. It also allows the user to determine if the power ratings are accurate or pure BS like has become common.
     
  18. TheGuuH

    TheGuuH Master Guru

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    in my OLLLLLLLDER system was a PD945 @ 4 and a 3850 @ 3870 lol with a "600w" PSU (350w or 400w real) and everything fine, but anyway u should buy a new PSU
     
  19. IPW

    IPW Member

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    Ended up getting Corsair 600W. Guess what? Card still does not work!! So invested in another :-(
     

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