I'm running two msi gtx 460 cyclone edition, watercooled with mcw-60 from swiftech, as the ram and vrm are not cooled by anything on the stock cooler (added a fan on top of the vrm just to be safe).
My temps are around 40c full load (they are both oced to 910 core, 1,087v), with a difference of 1 degree between the first and second gpu. They are cooled by a swiftech mcr320 (slim) rad, which (i think) is roughly the same performance as a rx240.
I don't see any problem from adding another gpu to your loop. The gtx 460 are so much fun to play with!
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