5870 vga via mini display port iffy

Discussion in 'Mac Pro' started by galstaph, Nov 25, 2010.

  1. galstaph macrumors 6502a


    Jul 24, 2002
    The Great White North Eh
    So for fun I decided I'd try my old crt monitor on the new 5870 (figured it'd be nice to hold toolbars in). I hooked it up via the mini display port->vga adaptor (apple branded) I use for my mbp, the issue is that I cannot get it to work on osx, and I got it it work once on windows... it works just peachy on my mbp though.
    Is there any known issue with vga output on the mdp?
    It isn't mission critical to get it to work so I can leave it at that but could this be a sign there is something wrong with my mdps? (I use the dvi link for my main lcd)...
  2. xyzzy-xyzzy macrumors member

    Sep 19, 2010
    My old system has two 17" vga's. I wanted to share one of them with my mac pro through a kvm. Prior to getting the kvm I hooked one of my vga's (a 17" Samsung SyncMaster 753DF) directly to my 5870 through one of those apple mDP->vga adaptors to make sure it would work. If I recall I needed to play around a little bit with the displays preference panel (sync rates, detect displays) until my mac pro "got the message" ;) It worked. So now I do have a vga sharing both my mac pro and my old system through a kvm.

    So, bottom line, yes, based on my experience, I would expect your vga to work through the vga adaptor.

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