No you can't raid all 4 Sata 6G ports. Only 2
From Newegg specs: SATA RAID 2 x SATA 6Gb/s port(s) (red) and 4 x SATA 3Gb/s port(s) (black) Support RAID 0, 1, 5, 10
From asus.com/Rampage IV Formula/Specifications/Storage:
Intel® X79 chipset :
2 x SATA 6Gb/s port(s), red
4 x SATA 3Gb/s port(s), black
Support Raid 0, 1, 5, 10
ASMedia® ASM1061 controller :
2 x SATA 6Gb/s port(s), red
2 x Power eSATA 6Gb/s port(s), red
According to this two (internal, the powered ones are eSata) sata III ports are on each controller and I'm 99.9% sure the ASMedia controller is the one that doesn't support raid since your Raid console is Intel.
According to Neweggs specs only 2 sata III ports support raid which makes sense since for a four drive raid array they would all have to be on the same controller.
If you really need/want to raid 4 Sata III SSD's (without using the slower Sata II ports) you will have to buy a PCIe Sata III raid card.
Another option would be a RevoDrive. Something like this maybe:
http://www.newegg.com/Product/Product.aspx?Item=20-227-744
240GB for $699.99
Performance:
Max Sequential Read
Up to 1500 MB/s
Max Sequential Write
Up to 1225 MB/s
4KB Random Write
Up to 200,000 IOPS
Or this if you need more space and a little more speed:
http://www.newegg.com/Product/Product.aspx?Item=N82E16820227764
480GB for $1,299.99
Performance:
Max Sequential Read
Up to 1600 MB/s
Max Sequential Write
Up to 1500 MB/s
4KB Random Write
Up to 240,000 IOPS
Honestly though unless your making large transfers to an equally fast destination I'm not sure that you'll see much difference between one Sata III SSD and two in Raid 0 let alone four in Raid 0
But I'll not here to judge your needs, wants or desires, just to help with your question.