Yes, its a poor way of figuring out radiator needs. CPUs dump a great deal less heat than GPUs, but they are also far more sensitive to the water temp. Thats why the 295x2 is able to cool what amounts to two 290x cores with a single 120.1. GPUs are perfectly fine with water that is 20-30 degrees warmer than ambient. Meanwhile, my 4670k will hit 85c with like a 2 degree water delta.
+1
Sorry, I've been MIA and last nights bar action is taking its toll.
We kinda have a rule of thumb. Its either 120.1 per chip for high FPI/high RPM or 120.2 for low FPI/low RPM but that has pretty much gone out the window because every chip is different in heat load and you will eventually hit diminishing returns. As said by trucker, CPU's are very sensitive compared to GPUs. GPUs can have a 20c delta all day and not break a sweat. Hell they can go as high as 30c-40c.
As for what the OP needs, I'd fill up the 900D with all low FPI rads with premium
Noiseblocker E-loop radiator fans because she is a HUGE case . Those fans are expensive but very quiet and well worth it. The point of this build is to get watercooled temps at quiet loads unless you want a noisy rig. I personally went overkill on a CPU + GPU only loop. lol 120.4 on the bottom windowed side, 120.2 on the PSU back side and a 120.3 up top is my setup atm. Low FPI rads @ 800-1000 RPM fans. I will have to update my build log soon and input all this newly updated info.
In your case OP, you could go 120.4 bottom and top and 120.2 on the PSU bottom side. You won't be able to fit a radiator on the front because the bottom rads would be in the way. Don't forget if you do go 120.4 up top, you will lose the top bay space. Make sure to measure how much room you have with the 25mm fans. It will add up quick. I could have gone with push and pull but the fans literally would be blowing air next to each other. I would just got with either push OR pull on all rads. I would do a positive pressure configuration since the 900D is filled with filters except for the back. What I have done is use all the fans, top, bottom and front as intake and use the unfiltered back as exhaust. I barely have dust in my case and love it that way.
I also wouldn't watercool the MB or RAM. Just CPU and GPU all in ONE loop. Dual loops are pointless these days plus you'd spend extra money for a few degrees.
The 2 D5s with the newly revised Koolance reservoir should be more than enough. Having 2 pumps is great because you add redundancy. Just pay attention to priming and bleeding as Koolance reservoirs have been prone to those issues at times.
As for tubing if you chose to go with, Primochill Advanced LRT is the king atm. No issues what so ever and pick the color you'd like. If you went with rigid tubing, its great looking but a pain in the wazoo if you had to install, repair or exchange parts from the rig or loop. I would stick with tubing for way less headaches.
Distilled water and biocide is the right choice.
Hope this helps and if you have any questions don't be afraid to ask. I also hope you bring us along in your journey in pics.
Same
