cooling wise, they won't be too different (pumps). But noise wise the D5 is silent, the bay res made a hum which I personally found unbearable
+1

I had the XSPC Dual Bay res and the DDC pump didn't shut up humming it was like one of them air pumps in a fish tank. So i pulled it out and put in a bitspower Res 150mm and D5. now all i can hear is my GT1850's which is basically silent