Apparently PC 6870 works just fine in Mac Pro – without flashing
All you need is updated drivers pulled from Macbook Pro OSX 10.6.7 build
No boot screen though.
Perhaps this means we will have much easier use of PC graphic cards in next OSX, Lion.
as for QECI for 4890 for 10.6.7, it will come when it comes, don’t update yet if QECI is important to you. as soon as it’s out, zeus will be updated with it.