Which DDR3 is the RAM ? DDR3-XXXX ?
Kingston 2GB DDR3 bus 1333MHz CL9
Unless you use PCIE Riser Cables, you cant Add all 4 Cards to the Board, due they Are Dual Slot.
You can Add 3 then, cause the 2nd Card will hide the 3rd Slot.
Can i use the cables and still keep it in the case somewhere?
I wouldn't use a case at all for 4x6950 GPUs on a dedicated miner.
There are many innovative caseless solutions on the board. And boot from a 4GB USB stick and go diskless (no HDD or DVD).
The atmosphere here is dusty, not sure if the GPUs gonna like it caseless.
With the PCIe entender cables (Cablesuarus.com) mentioned by badfrog this M/B would probably support 6 GPUs as the two PCIe x1 slots will work fine for mining.
6? GPUs o.O