to me since the gpu is what will generate the most heat and noise in your system.
this statement is only true on stock systems, if you clock a CPU, there is a good chance that the CPU will generate more heat than the GPU.
here is a example of what I mean
house temps are right around 28C for most of the year,
this is a earlier build I did it has 2 radiators in parallel with each other, it has 2 X 240mm radiators, it has a CPU and GPU in series with each other, but the CPU and GPU water blocks are older blocks, with a open high flow design, so the flow rate on this system is 6LPM.
the load temps on this build are.
this system is a stock system with no clocks on the hardware
I did this build as a serial/parallel build it also has a flow rate of 6LPM, it has 1 X 360mm monstra radiator a CPU and GPU in parallel with each other, it looks nice, a lot went into making it look nice.
the load temps on this build are
not as good on temps as the older build, but also there is not as much radiator space on this build.
this system is also a stock system no clocks on the hardware
and the final build is my gaming rig, it has 2 X 360mm radiators in parallel with each other, and a CPU and 2 X GPU's in parallel with each other on a 3-way parallel configuration, this system is clocked, the CPU is at 4Ghz, the GPU's are at 580Mhz, and the memory is at 1600Mhz.the load temps of the hardware are
CPU - 54C
GPU 1 - 45C
GPU 2 - 45Cthe water temps at load are
the delta t of the system at load is 4CLink to Gallery
this system has a total flow rate of 9.6LPM
have a look at the total post
if this system was stock with no clocks on any of the hardware, the load temps would be.
CPU - 35C
GPU1 - 37C
GPU2 - 37C
as you can see the clocked CPU temps are higher than the GPU temps