Connect LED Cinema Display to a PC Using Apple ATI Radeon 4870

Discussion in 'Mac Peripherals' started by integrat.ethis, Mar 31, 2009.

  1. macrumors regular

    Joined:
    Oct 28, 2008
    #1
    The ridiculously long thread title pretty much says it all. Is it possible to buy one of Apple's ATI Radeon 4870 cards with the mini-display port connection, install them in a PC, and then use the LED Cinema Display with a PC?

    EDIT 5/31/09: Looks like you can! See my last post for details...
     
  2. macrumors G4

    Joined:
    May 6, 2008
    #2
    NO. :( Your PC uses BIOS, while the Mac HD4870 would contain EFI based firmware. Unfortunately, the two different firmware specs aren't compatible with one another.
     
  3. macrumors 68020

    pastrychef

    Joined:
    Sep 15, 2006
    Location:
    New York City, NY
    #3
    I'm quite certain it will work. Apple's 4870 contians EFI and BIOS firmware. When plugged in to a regular PC, it should just ignor the EFI part.
     
  4. thread starter macrumors regular

    Joined:
    Oct 28, 2008
    #4
    I love the internet.
     
  5. macrumors 68020

    pastrychef

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    Location:
    New York City, NY
    #5
    Unfortunately, I don't have a PC, otherwise, I would test it for you.
     
  6. macrumors G4

    Joined:
    May 6, 2008
    #6
    The HD3870 does, but the HD4870?
    As it's offered by Apple, I'd think this wasn't done. If it where directly by ATI, then I'd expect it.

    I've not seen any spec listing BIOS support for it anywhere. Do you have a link by chance?
    I do. :D Mind sending one my way? ;) :p
    (I actually have an HD4870 in it now, so I wouldn't even need to install any drivers). :eek: ;)
     
  7. macrumors 68020

    pastrychef

    Joined:
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    Location:
    New York City, NY
    #7
    I don't have a link, however, when we boot in to Bootcamp, isn't it using the Bios part of it? That's why video cards that have no EFI support at all still work in Bootcamp.
     
  8. macrumors G4

    Joined:
    May 6, 2008
    #8
    Mac's have BIOS emulation built into it's EFI. But not the other way around.

    If the graphics card has EFI only, a PC can't load the firmware, as BIOS hasn't included an EFI Emulator. That's what Vanilla Kernel does, and why a hack can be made with a little effort. But not "out of the box". ;)

    As I've not seen BIOS support listed in the spec, the Mac version used in a PC won't work. :(

    (A link indicating the Mac HD48770 supports BIOS is what I was looking for. So far, I've not found one). So it looks like no Mini DisplayPort (native, no adapters) in a PC. :(
     
  9. thread starter macrumors regular

    Joined:
    Oct 28, 2008
    #9
    So, then, it sounds like my best hope would be getting a graphics card with Display Port, and then scouring the internet for a DP to mini-DP adapter? I'm guessing such an adapter is very, very possible. And though I haven't looked at the spec at all, I'd hope that it would be possible to make an adapter myself, since I'm a little handy in electrical engineering.
     
  10. macrumors G4

    Joined:
    May 6, 2008
    #10
    They aren't currently available, so if you can find the parts (Mini DisplayPort connector), DIY is the only way ATM.

    Spec wise, it's easy. :D Same electrical spec, just a smaller port. :p

    Let us know if you locate the Mini DisplayPort connector, as other members may be interested. ;)
     
  11. macrumors 6502a

    Joined:
    Jul 18, 2008
    #11
    Making your own adapter sounds like an adventure. :cool:

    All I can say is that mini-display port is very very new and adapters are just starting to trickle in. Today I received my male displayport to female hdmi adapter and seeing my macbook and movies on the big screen was nice. :D
     
  12. macrumors 6502

    Joined:
    Mar 8, 2009
    #12
    Sorry if I'm naive here, but couldn't you get any standard PC video card that has DVI, then buy apples DVI->Mini DisplayPort for $29 and be up and running? Assuming the 24" ACD does not need Dual Link DVI but only single (Dual Link MDP adapter is $99).

    Is the ACD proprietary to Apple GPU connections?
     
  13. macrumors P6

    Tallest Skil

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    #13
    No.

    Yes.
     
  14. thread starter macrumors regular

    Joined:
    Oct 28, 2008
    #14
    Now when you say that, you don't really mean Apple GPUs, but just the mini-display port connection (Display Port protocol), right?
     
  15. macrumors 6502

    Joined:
    Mar 8, 2009
    #15
    Wow, so not only is Mini DisplayPort only being used by Apple, in order to use the new ACDs, you MUST use it on an Apple Computer? This sounds like hogwash to me . . .
     
  16. thread starter macrumors regular

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    Oct 28, 2008
    #16
    Found this thread on the official apple support forums... apparently it actually does work!

    http://discussions.apple.com/thread.jspa?threadID=2019902&tstart=0
     
  17. macrumors 68020

    pastrychef

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    #17
  18. macrumors 6502

    Joined:
    Jul 21, 2008
    #18

    You forgot to mention to the "HACKSAW" :D

     
  19. thread starter macrumors regular

    Joined:
    Oct 28, 2008
    #19
    Oh, that just makes it all the more hardcore. He said this probably wouldn't be an issue for normal PCs, so I'm not too worried about it.
     
  20. macrumors Core

    alphaod

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    上海 (Shanghai)
    #20
    Except Dell chassis are normal in size…
     
  21. macrumors 65816

    TheStrudel

    Joined:
    Jan 5, 2008
    #21
    The 4870 does have BIOS, I think, usable in a PC. Those of us who flashed essentially edited our ROM by adding the EFI portion to ours. I think - but don't know, The Rominator and Netkas could tell you better - that the EFI essentially launches the BIOS portion, so using the 4870 to get MDP working might potentially work.

    Now, as another solution entirely, check monoprice for MDP adapters. They've got a couple already and are working on others.
     
  22. macrumors 68000

    hitekalex

    Joined:
    Feb 4, 2008
    Location:
    Chicago, USA
    #22
    MonoPrice doesn't carry any DP-to-MDP adapters.. they only have HDMI/DVI/VGA ones, which doesn't help. I e-mailed them inquiring about MDP-DP earlier, and the response was these adopters don't exist :mad:

    http://www.monoprice.com/products/subdepartment.asp?c_id=104&cp_id=10428
     
  23. macrumors 65816

    TheStrudel

    Joined:
    Jan 5, 2008
    #23
    Given how few video cards have displayport out at this point, I was thinking of the adapters they do have. I didn't think he had a DP out.
     
  24. macrumors 68000

    hitekalex

    Joined:
    Feb 4, 2008
    Location:
    Chicago, USA
    #24
    Well, the adapters that they do have won't help attach a PC to LED Cinema Display. You can't use DVI/HDMI video cards to connect to LED-CD, the DVI-MDP adapter is of no use here.
     
  25. macrumors regular

    Joined:
    Jul 7, 2008
    #25
    I tried it with a Radeon 5850 and mini display port to display port adaptor but no joy.

    I got it to work with Atlona DP200 but it wan't perfect. It wouldn't always come on when the PC was woken from sleep.

    Finally resorted to a Radeon 5870 eyefinity and everything is good now!
     

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