How many HD7990 or R9280X can I fit into my Z77M-D3H? For mining purposes.

[kaimcsquare]

How many HD7990 or R9280X can I fit into my Z77M-D3H?
http://www.gigabyte.com/products/product-page.aspx?pid=4142#sp

I plan to get 2x, and then another 1x, since there are four PCIe slots. The last slot I plan to use my current cheapo 6670 for normal computer use, while the 3 beasts mine for cryptocoins.

I look at the pictures though and those things are HUGE; I have no idea if they would fit.

Additionally, I'm wondering if my no-brand case would actually have enough space either.
In fact, I'm already worrying about heat issues.

I also don't know what kind of PSU I would need to run all four cards, 3 of them at 100% load 24/7.

I would kindly appreciate some input and help, thanks!

 

[inzone]

Looks like two. The cards in question are dual slot cards and the first one will cover the x1 slot. Then that bottom slot is a x4 slot. There is one x16 slot , the second and fourth are x4 slots and the bigger white one is a PCI slot , the two blue and smaller white one are Pci-e slots.