Presumably I could toggle one monitor to its DisplayPort input during boot to select OSX or Windows, and then toggle back to DVI input. Should be okay, right?
I have Dell U2410. Nice thing about DP is that when the display isn't in DP mode, there is nothing detected on DP. This is opposite of DVI, where even if you are using VGA or the Dislpay is powered down, the EDID from DVI still goes to card and it "thinks" DVI is on.
BTW, I want to point out that the man who made using GTX5xx cards possible, Netkas, now has a "Donation" button.
It would be nice if everyone using one of these "non supported" cards took a moment to thank him.