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I have to say, it's something I am considering - or at least moving a radiator and reservoir/pump out of the case. I find the position of my reservoir in my PC-011D (mounted to fans on the side of the motherboard tray) means that I am very restricted in terms of GPU length. Fine if it's a GPU with a waterblock on it, but if it is a GPU that hasn't had a block fitted yet, it doesn't work.Lots of us running Tiny cases with an external rad now.
I'm all up for seeing more pictures of the external solutions - particularly any DIY ones!