I'm planning on building a custom PC in a highly space-constrained case. I can't use a closed loop cooling kit because the motherboard I'm using requires a special CPU water block. Therefore, I must source all the components and build a custom loop myself.
All of the reservoir options I see out there are just a ton of overkill for the sake of looking really slick, but I don't care about any of that because nobody will be seeing it. And because the case is so tight, it's going to be extremely difficult to fit a reservoir, pump, and radiator in the amount of space I have to fit them in. Basically, I need to use the smallest volume of water I can get away with.
I've seen some forums suggesting that a reservoir just makes things look neat and makes it easier to fill the loop with coolant. So my question is, can just the volume of water inside the block, tubing, and radiator suffice to keep the system cool? I'm speaking generally of course (I don't want this question to be too broad or asking for a hardware recommendation).
This computer will not be a gaming rig, so the GPU will not be part of the loop. It will primarily be doing CPU-bound tasks like rendering and virtualization, so I'll be using a 12-core CPU. I only plan to moderately overclock, since reliability is preferable to speed for this machine.