How do I know/how can I control which video card a particular application uses?

Hey there--
Simple question: I have the ATI Radeon HD 2600 256 MB and the NVIDIA Quadro FX 5600 1536 MB installed via PCIe ports on an early 2008 Mac Pro. I've decided for a multitude of reasons that I'd like my displays to be plugged into the HD 2600, but I want certain applications-- Final Cut, games, etc-- to use the FX 5600. How can I be sure that this is happening? Is it possible? Will more intensive applications automatically utilize the proper card?
Thanks much.

Yes, it means the 7970 requires 1 x 6 pin and 1 x 8 pin. The Mac Pro supplies 2 x 6 pin, which is 75 Watts each.
So Mac Pro can supply 75 Watts from PCIe slot and 2 x 75 Watts from 2 x 6 pin for the total of 225 Watts.
The 7970 requires more than 225 Watts. There are people that run these cards from internal power and say the additional power pulled over the traces on the Mainboard won't damage the board, but I've seen several reports of burned out Mainboards and more commonly the PSU just shuts the Mac Pro down hard for safety reasons. Remember: the 2 x 6 pin ports power runs over traces(!) on the board, not over cables. If you over tax them this is a lot more dangerous as with cables.
It's up to everyone to decide for themself if they want to risk running cards above the power provided by the Mac Pro.
The safe way is always to go for 2 x SATA to 1 x 6 pin adapter and 2 x 6 pin to 1 x 8 pin adapters and provide the power for 7970 / R9 280x or GTX 780 in the Mac Pro like that. Or get an external / additional PSU for power hungry GPUs. That works, too.
But you will obviously lose 2 x SATA ports. I run eSATA with RAID5 anyway, since RAID5 in the Mac Pro is too much of a hassle.
Of course all that matters if it works in the end. But official power specifications are a matter you shouldn't take too lightly.

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2014-11-28 14:46 GMT+01:00 cuisinerouge . <[email protected]>:
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2014-11-28 14:43 GMT+01:00 c.pfaffenbichler <[email protected]>:
how do you know how much compression a jpg file is compressed with ?
>> created by c.pfaffenbichler
>> <https://forums.adobe.com/people/c.pfaffenbichler> in *Photoshop General
>> Discussion* - View the full discussion
>> <https://forums.adobe.com/message/6969227#6969227>
>>

How do I know/how can I control which video card a particular application uses?

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