Agreed with saltynay, you won't be able to keep good temps if you put an Ultra and a q6600 on that loops. GFX cards run WAY hotter that CPUs do. Keep that in mind. My GTX sits idle at 58C but jumps to 70s when in load while my QX6700 idles at 29C (custom watercooled) and never goes above ~45C in extreme conditions. Those temps are WAY different and your Ultra will be putting alot of heat into that loop that is more than likely not equipped to handle those two together, therefore not sufficiently cooling your CPU.