I know this thread has been solved but I want the OP to be clear about certain things.
Your mother board will support all the graphic cards, but there may be compatibility issues if you are using a low end power supply which would not be able to give enough juice to run the graphic card and processor under load.
From the specs I am guessing that your old machine may not be having an adiquate power supply.
Another suggestion that I would like to give is that to save some money you should buy a non-k processor as you cant overclock on that motherboard.
With the money left you can buy some gaming peripherals.
($208) and a gtx 780
And what cabinet do you have. Can it fit a standart size power supply?