Your intuition is right. I had two quick-disconnect plugs from barrow and they have even more restrictions together than a 280 rad.
I used apogee drive ii as cpu block, it has one 18W ddc. Then I put a iceman pump reservoir combo at the back of my case with another 18w ddc.
I don't have enough...
Just fyi, I have a 280GTS, 2xTX240. With one 18W DDC, I have 0.7GPM at max. To balance the noise I go with two 18w DDC.
Now I have about 1.2GPM at max, 0.45GPM at min, 0.7GPM at quiet level.
Remove some 90 degree fittings will help your flow but with such a complicated loop, it might be too hard...
Beautiful layout. It's amazing that you can fit triple 280 rads into it. But have you tested the water flow rate? When I worked on my triple rad build, the flow rate with a single DDC was shockingly low.
It actually depends on how you think about water flow. Will the 0.5GPM and 1GPM make a huge difference in the daily tasks? Not really. There might be several degrees difference at full load but you won't notice it on other occasions. My goal was to build the future proof loop at a quiet level...
I wouldn't say this board is a poor choice. I can easily name two case that can hold it.
1. Ncase M1, I did a dual 240 rad loop in it with C8I
2. NR200, I did triple rad 1x 280 and 2x 240 in it with C8I.
This board is a beast in overclock. I tuned my 3200C14 dual rank b-die(2x16g) to be 3800C14...
1. Intel is not a must. AMD is totally fine. I'm running my 3900x hackintosh. But if VM is your priority then go with intel.
2. If you want Hackintosh with decent GPU, you probably want to think about 6800xt/6900xt. Bifurcation for 2 GPU will take a lot internal space.
My build has been finished last month. I was really busy recently as I was trying to secure a new job.
Sorry folks I'm too lazy to post pictures here. And I didn't take many when I worked on the build. Anyway, all I want to do here is leaving some advice for the folks who want to do this crazy...
I strongly advise you test it. I did a triple rad build in nr200. 1x 280gts, 2x TX240.
One 18w DDC pump is not strong enough. I got only 0.7~0.8 GPM at max speed and it's very noisy.
I end up with two 18W ddc pump, now I can reach 1.2GPM at max. 0.75GPM at quiet.
Update: I put an extra ddc pump with the iceman pump res combo, optimize the tube routing and use only 7 90 degree fittings and 2 45 degree fittings.
It turns out dual pump is a must for this triple rad build. There is always a misconception in all kinds of discussion that "ONE 18W PUMP CAN...