Wanted to say thanks for all the help within this thread. Re-read it over and over before making the jump.
EliteGroup ECS 570 GTX with device ID1081
http://www.newegg.com/Product/Product.aspx?Item=N82E16814134125&Tpk=elite%20group%20570
I bought this two days ago when it also had a $50 rebate, ended yesterday unfortunately.
I purchased this GPU knowing it had the ID 1081 after googling the various ones found on NewEgg. Some had 1086 or 1081 and since I was unsure which ID I would receive, I passed those. This was the only one I was sure to have an 1081 ID since it was the only model for this manufacturer. $269 after rebate as well =)
Anyway basically followed the guide on Insanelymac only did a couple of steps to get it going.
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Did the device ID addition 1081 for my GTX 570 in the nvidia HAL100 txt thing.
I did this before installing the card as I had a 6870 in it before. I also am running Lion 10.7.
Powered off the system.
Removed 6870 and
Installed the GTX 570 into the system and rebooted.
Booted into Lion perfectly and things looked great, got 1920x1080 via main screen DVI and 1080p via secondary screen via HDMI right out the box.
I don't plan to game but I read flash videos can crash the system without graphics mode. I tested flash, and it did not play, but when I double clicked to full screen it worked.
So I wanted flash to work properly, not too worried about AGPM etc. I put in the graphics mode/empty string first into the org.chameleon and rebooted and it did not help.
Next, I put graphics mode/empty string into the .com.boot plist in the extras folder and after the initial chameleon loader, the apple logo was small toward the left upper corner as many have reported, no biggy this just replaces the grey apple boot loading screen. Then it boots into OSX no problems and flash videos work in the youtube small regular viewer. I have not run benchmarks yet but so far I'm happy.
My about this mac shows GeForce GTX 570 1280MB under the displays tab, I did not have to edit anything there there, just automatically read it.
My build:
GA-Z68MX-UD2H-B3
i5-2500k
GTX 570 Elite Group ECS
http://www.newegg.com/Product/Product.a ... roup%20570
8GB G.Skill 1600
Mac Pro 3,1
not sure what else is important but yup! Good to go. Used this forum and tonymac as references and will be cross posting to help whoever may need it.
*edit*
Cinebench 11.5 OpenGL test I got 45.58, OC'd CPU to 4.2Ghz