ALU cpu block experiment

[BertM]

if you read alot of post in the liquid section, you see alof of hate towards alu. and some say its not that bad and they have no corrosion.
this leaves some questionmarks, is it realy that bad... or not.

i work daily with aluminium and i own a cnc milling machine which i reasently upgraded with new axis for more precision.
so i thought, let me try to make an alu cpu block and use high grade antifreeze and see if i get corrosion over time.
i have some brass in stock as well so i could have made one from brass as well but he, thats no science, boring.

components used in watersetup:
pump: Laing DDC-1Plus MCP355 12V
top: XSPC Laing DDC Acrylic Reservoir
radiator: (copper) pa120.3
tubing: ordinairy 3/8 tubing.
fittings: 3/8 EK High Flow
liquid: yanmar high grade antifreeze

my first experiment was with water, i putted some tap water in the reservoir.
this was a few months ago and today i picked it up from the corner where i left it and there was some weird white gunk against the acryl and in the water.
so that confirmed that water is an absolute no go. kinda spoiled my reservoir to.

cpu block:
the cpu block is my own design and i had no plans to start with.
its all entered manual in the cnc machine and made it all up as i wenth forward.
base is 3mm thick and the waterchannels are 4mm deep.
the holder that keeps it on the cpu is from a freezer pro 64.
i adjusted the total thickness of the cpu block to this cooler so it would fit.

experiences after mounting:
when i started it up, i noticed a temp drop straight away under idle, under load it was about 7 degree lower, with only 1 slow turning blower on the pa120.3.
so an alu block works better then a freezer 64 pro.
i found that that if i put the 5000be on 1ghz with 0.8 volt, that i could turn of the pump, now this is very very nice. during the night i can leave it off without worrieng about leakage or anything.
i do need to point a blower towards the cpu though, temp under idle remains 30 degree with pump off.
cpu is an amd 5000 be normaly running max at 3ghz here and speed is regulated by cristalcpuid.

after a few months i hope to open this cpu block and see what has happened with it. my guess right now with this type of antifreeze that it would be ok.
the color of the antifreeze is a bit weird, but i got it for free so i dont care.