Can the 2008 Mac Pro (MacPro3,1) support two graphics cards?

I have a 2008 Mac Pro, I want to know if I can run two graphics cards in tandem?
I currently have a ATI Radeon HD 5770 installed for 1GB of graphics, I want to find out if It's also possible to run a second card to increase the total graphics power of the machine?
I see two possible options;
First, run the HD 5770 in one of the PCI Express 16-lane slots, and the old NVIDIA GeForce 8800 GT in the other available 16-lane slot; for a total of 1.5GB GPU power.
Second, would it be possible to run two ATI Radeon HD 5770 cards, in each 16-lane slot; for a total of 2GB of GPU power.
I realise that this would first require a power supply upgrade, as my machine only shipped with a 318 watt power supply. (Which would not support running two high-end cards.)
It would be very useful.
Thank you for any advice.
Regards,
Peter.

Thanks for the information!
I wouldn't have thought there would be enough power capacity in the current supply to run two cards. - Would this mean OS X will only see one card whilst the other sits as inactive hardware? (Or does it mean that that the system will see two different cards?
For example:
Would it be possible to use one card for a graphics intensive process in Adobe Photoshop, and use the other card separately with another application such as Final Cut Pro or Adobe Premiere Pro?
Also, how would a 64-bit application like Adobe Photoshop which has GPU acceleration utilise the setup? Would it only be ably to use one card at a time (per process)? Or could it utilise both cards at once to in essence get twice the graphics acceleration than if only using a single card?
Simply, can OS X assign each card to a different application/process? I hope that makes sense.
Also, any thoughts on how Bootcamp would handle two cards (since crossfire should be available in Windows?
Before I commit to purchasing a second 5770, would you seeing if my Mac will run the current card + the old NVIDIA 8800 gt?
Thanks in advance.

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Go to System Profile and look, does it say "MacPro3,1"?
That is 2008.
FBDIMM would be 800MHz. Did you use older slower 667MHz in yours?
You can but take a hit in performance.
Sounds like MacPro1,1.
Mac Pro (3.0GHz quad core (dual CPUs) 8GB 667 RAM)
In 2007 March an 8-core 3GHz did come out 2,1.
So just to be clear.
===========
It was all working fine a couple of days ago. At the time it randomly shut down I was trying to use Boot Camp to create a Windows 7 area,
Whenever you want to install Windows, remove all the drives other than the one Windows goes to. And if you use a dedicated drive YOU DO NOT NEED Boot Camp Assist, unless you use XP, which really is limited and crippled (one processor, 1.9GB RAM support).
And when it freezes, your only choice is to nuke (reformat) and restore or get out that backup CLONE you made before (ie, Step #1 in the Boot Camp Guide).
Sure that whole NTFS / MBR / GUID could be an issue, but you should just have a blank drive or clone.
No don't bother Apple, they seem to not have a good sense about Windows on Mac Pro anyway.
Other than zap pram from cold boot / tried booting with NO drives inside and just 10.6. DVD - should be fine.
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Can the 2008 Mac Pro (MacPro3,1) support two graphics cards?

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