Two GeForce 9800 GX2's in a Mac Pro with an external power supply

[newmacdev]

This is an 8 year old thread you responded to. That might be some sort of necro-thread record.

In any case, these days Apple does in fact initiate many video cards when the OS loads.

but I still have the problem to flash 9800gtx+ and boot in OS X on mac pro.