Apple graphics card vs flashed graphics card

My old Apple Cinema Display went down today, and I had to buy an Apple Cinema LED 24" display with a mini displayport connector. Do the Apple cards show the gray Boot Screen through the mini display port? I'm am told the flashed cards will not show the boot screen through the mini displayport connector. I have an encrypted disk, so how would I log in if the card doesn't show the boot screen?

Hi, Peter:
Unless someone has attempted to install a PCIe x16 v3.0 card in that motherboard, you won't get an absolutely 100% correct answer.
I looked and looked and cannot find precise info on the spec revision on that motherboard, but I would tend to agree with you that it is only v 1.0 due to the age of the nForce 430 chipset (ca 2004).
This article gives some damning info regarding the compatibility of PCIe x 2.1 and newer cards in motherboards with PCI e x16 1.0 or 1.0 a boards.  Specifically, this note...
PCI Express 2.1
PCI Express 2.1 supports a large proportion of the management, support, and troubleshooting systems planned for full implementation in PCI Express 3.0. Unfortunately, the increase in power from the slot breaks backward compatibility between PCI Express 2.1 cards and some older motherboards with 1.0/1.0a, but most motherboards with PCI Express 1.1 connectors are provided with a BIOS update by their manufacturers through utilities to support backward compatibility of cards with PCIe 2.1.
http://en.wikipedia.org/wiki/PCI_Express
If it were me, I would not install any graphics card beyond PCIe rev 2.0 in your model.

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