Got a time appropriate waterblock for a planned Athlon XP build. It's a Nexustek H2O-2000, one inlet/two outlet waterblock for Socket A, 478, and 939. It has additional mounting hardware for the latter two, but with Socket A only needs to be screwed on. It does have some crud in the block, but that might be copper oxidation which isn't a huge problem. Either way, I'm going to look into what I can use to flush and clean the block with, then do a leak test on it, letting it run on a closed loop with a pump and reservoir (combo) above some sort of tub.
The block comes with a Y-splitter that you're supposed to put the two tubes coming out of the outlets on, but I plan on doing it a bit different. I want to liquid cool both the chipset and graphics card along with the CPU, so what I'll do is have one outlet run a tube to the chipset block, the other oulet a tube to the graphics card block, then have the two outlets of those meet at a Y-fitting at the reservoir or pump.
The Nexustek block cost me €7,50, so not too terrible if it ends up leaking, then it'll just be a neat showpiece 😵 🤣
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