If you have tested Target Display with a Display Port compatible PC Graphics card, connected to the Mid 2010 iMac 27" please can you report here?
NVIDIA
GTX 680 - Untested
GTX 580 - Untested
GTX 570 | EVGA with DP to MinDP adapter
AMD
AMD 7970 - Untested
AMD 6870 | SAPPHIRE HD GB GDDR5 PCIE with Eyefinity
AMD 6850 | SAPPHIRE with Mini DP
AMD 6770 | Radeon HD 6770 1GB 128-bit GDDR5 PCI Express 2.1 x16 HDCP Ready CrossFireX Support Video Card
AMD 6970 - Untested
ATI 5970 | brand unknown
Onboard GPU
ASUS P8Z77 - Working, see post #3
If you have 100% proof of working cards, please supply:
GPU Model| Manufacturer
I have found many people are after this information, but no good source of info is available. Many mid 2010 owners are looking to use the imac as a screen for a gaming PC, but there are several horror stories of cards not working as expected..
Background reading and non compatible cards:
https://forums.macrumors.com/threads/1264950/
NVIDIA
GTX 680 - Untested
GTX 580 - Untested
GTX 570 | EVGA with DP to MinDP adapter
AMD
AMD 7970 - Untested
AMD 6870 | SAPPHIRE HD GB GDDR5 PCIE with Eyefinity
AMD 6850 | SAPPHIRE with Mini DP
AMD 6770 | Radeon HD 6770 1GB 128-bit GDDR5 PCI Express 2.1 x16 HDCP Ready CrossFireX Support Video Card
AMD 6970 - Untested
ATI 5970 | brand unknown
Onboard GPU
ASUS P8Z77 - Working, see post #3
If you have 100% proof of working cards, please supply:
GPU Model| Manufacturer
I have found many people are after this information, but no good source of info is available. Many mid 2010 owners are looking to use the imac as a screen for a gaming PC, but there are several horror stories of cards not working as expected..

Background reading and non compatible cards:
https://forums.macrumors.com/threads/1264950/
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