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Customer Review

10 of 10 people found the following review helpful
5.0 out of 5 stars Perfect in Target Display Mode, December 14, 2010
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This review is from: XFX ATI Radeon HD6870 1 GB DDR5 2DVI/HDMI/2x Mini DisplayPort PCI-Express Video Card HD687AZNFC (Personal Computers)
Like John Smiley, I bought this to drive my late-2009 27" iMac in target display mode. I can report that it works perfectly. I have it driving three displays -- mini displayport (iMac) and two DVI outputs. Games perform perfectly on maximum detail at the full resolution of the iMac.

You might wonder why this is a five star rating. It's been a long and frustrating road for those of us trying to use the target display mode. There were a couple of really-old-generation cards that could do it. Due to some kind of flaw in the 5xxx series, only the 5870 could do it, and that was just too much to pay for a card that wouldn't be used to its full capabilities.

These 6870 cards perform almost as well as the 5870, at a far lower price point. Total win, as far as I can tell. I've left an older NVIDIA card in the machine so parallel stuff can run on its chipset.

Based on what I see at the ATI/AMD site, the drivers might be a little shaky, but I have not see any evidence of that yet.
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Showing 1-2 of 2 posts in this discussion
Initial post: Oct 29, 2011 5:57:11 PM PDT
Rick Strobel says:
Thanks to you and others who posted about getting this to work with the iMac's Target Display Mode. I recently built a Windows 7 PC and didn't carefully spec the video card for Displayport compatibility with the iMac. Figured "it's Displayport, it should work". WRONG. Spent the better part of the week, three different Displayport to Minidisplayport cables, borrowing a Dell 2408WFP monitor and made it work on that, and bought a Mini Displayport to Minidisplayport cable to drive the iMac from my MacBook Air.

So, I guess my video card (SAPPHIRE Vapor-X 100283VX-2L Radeon HD 5770) isn't compatible. I'm now looking for a new one.

In reply to an earlier post on Feb 1, 2016 11:41:46 AM PST
Last edited by the author on Feb 1, 2016 11:43:59 AM PST
Abes says:
I must be the only one in the world who was able to get my 5770 to work with my 2009 27", albeit with a DP to MDP cable. It took a lot of research, I modified some system files on the iMac, per a write up that I found, and one day it just worked all the time. Literally every time I swapped it was flawless. Recently my iracing night tracks started showing pitch black track surface. So I downloaded some beta drivers and I'm back to square one and swapping screens and unplugging/plugging in the cable at least 50 times before it works. I just purchased a 6870 and I hope it can perform as well or better than the 5770. I've read that the 6870 works perfect for my situation so we'll see how it goes
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