Running 2 Nvidia GTX470's in a Mac Pro ?

Hello,
I recently acquired TWO Nvidia GTX470's as a gift. I would like to run in a new Mac Pro 8-core 2.4Ghz Westmere (2010). I would like to do this in order to switch easily between AE, Nuke, etc. and Davinci Resolve, so one would be attached to the monitors and power Adobe's 64bit Mercury engine and the other would just be there to give CUDA support for the Davinci. Obviously there are a few issues.
1) Since the GTX 470's need 2 power cables (6 pin) can I run off of the Molex connectors in the optical bay (not sure how many are there) and evenly distribute the load by using 1 connector from the motherboard and the other from the Molex for each card?
2) I have heard the 2010 Mac Pro's have the capacity for 2 PCIe x16 slots and that unlike previous generations these can be any 2 slots you chose. This would be ideal as I would like to put these doublewidth video cards as far apart as possible in order to keep heat down and let the fans do their thing. Can anyone confirm this?
3) If I am forced to provide an additional power supply (even though the Mac Pro PSU is 1000w and should technically be able to handle this additional video card) what would be recommended? I have heard the visiontek/epower 450w unit (which fits into an optical bay) is quite awful and uses substandard parts as well as kicking a lot of heat back into the machine, so is there another alternative which does not require leaving the side door open or drilling holes in my new Mac Pro?
Thanks for your patience if this topic is redundant. Need to be as thorough as I can here.

1) Since the GTX 470's need 2 power cables (6 pin) can I run off of the Molex connectors in the optical bay (not sure how many are there) and evenly distribute the load by using 1 connector from the motherboard and the other from the Molex for each card?
The Mac Pro comes with two power adapters. So that limits you to one card. The only way you could power the other card is with an additional PSU. I've seen posts where this has been done. Attempting to split the power adapters to drive both cards will exceed the power capacity of the mac pro's power supply.
2) I have heard the 2010 Mac Pro's have the capacity for 2 PCIe x16 slots and that unlike previous generations these can be any 2 slots you chose. This would be ideal as I would like to put these doublewidth video cards as far apart as possible in order to keep heat down and let the fans do their thing. Can anyone confirm this?
I believe slots 1 and 2 are x16 and slots 3 and 4 are x4.
Relating to the issues of both power and slots you might want to read this apple discussions thread.
3) If I am forced to provide an additional power supply (even though the Mac Pro PSU is 1000w and should technically be able to handle this additional video card) what would be recommended? I have heard the visiontek/epower 450w unit (which fits into an optical bay) is quite awful and uses substandard parts as well as kicking a lot of heat back into the machine, so is there another alternative which does not require leaving the side door open or drilling holes in my new Mac Pro?
That apple discussions thread I referenced above has some info on what someone was planing on using.

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