Oh stupid me of course the h110i is for the CPU, sorry. Glad to hear they are EVGA, it gets rid of any warranty issues. The ST looks like it has 2 slots between the 2 card slots, so they should fit OK, in theory of course. I am thinking about the pluming of the tubes. Would it be better to connect all of the parts and run one loop or just let them run on their own.
The CM Glacier 240L is an expandable AIO loop, and much better pump and radiator than the H100i is. Has me thinking about how to wire up the pumps and fans also, your case even looks like it may accommodate the X40 and X60.
You really have me wondering on this, it looks like a great way to WC a graphics card without selling the house to pay for.