Use new 27" iMac screen for a hook up from a PC running ATI 5870 ?

Discussion in 'iMac' started by zepharus, Oct 22, 2009.

  1. zepharus macrumors 6502a


    Aug 7, 2007
    Would this work as a passthrough for the display? Thoughts?
  2. Lava Lamp Freak macrumors 65816

    Jun 1, 2006
    This idea is similar to the setup I have now, with a PC hooked to a 24" Apple Cinema Display. I'm using a Sapphire Radeon 4890, which has Display Port, and I'm using the Circuit Assembly cable to adapt Mini DP to DP. Unfortunately, I was unable to use a XFX Radeon 5850. It just wouldn't work, and XFX and ATI were unable to help me. I've also heard from others using an Asus 5850 and XFX 5870 and neither of them were able to use the ACD on them either. Perhaps it would work on the iMac, but it doesn't look good right now for the 5800 series and the 24" Apple Cinema Display.

    There are some powered converters but none of them say they'll support a resolution higher than 1920x1200.
  3. circularref macrumors newbie

    Nov 16, 2009
    Whatever issue is preventing the Radeon 5000 series from working with the 24" ACD is likely the same problem preventing it from working with the 27" iMac.

    The Sapphire Radeon 4890 DOES work with the 27" iMac's DisplayPort input port. Seems like a hardware/firmware issue on the ATI side:
  4. mpuck972 macrumors 6502


    Aug 31, 2007
    If your ATI card has a Mini-Display Port output, then you are good. If it has ANY OTHER TYPE OF OUTPUT, it won't work, and NO COMBINATION OF ADAPTERS will work.
  5. circularref macrumors newbie

    Nov 16, 2009
    Huh? That's a little misleading.

    Any PC video card with a full size DisplayPort output or a mini DisplayPort output SHOULD work with the 27" iMac's DisplayPort input, but for some reason the ATI Radeon 5000 does NOT work.

    The only video card that has been confirmed to work so far is the ATI Radeon 4890 (with a DP/mDP adapter cable).
  6. AlienSexGod macrumors member


    Mar 18, 2008

    All 3000 & 4000 series with DP work
    as does 5900 series with Dp work

    all other 5000 do NOt work but for the new 5870 Eyefinity 6
    or the Asus Eyefinity 6 would work too

    Maybe the below 5770 Eyefinity 5 card will also work when it actually ships:

    these all are latest generation with native multiple miniDP ports
  7. Blathian macrumors member

    Nov 4, 2007
    Any update on this issue? Has ATI fixed isuues from many of its 5XXX series cards not working with Displayport on 27"IMAC?

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