I put my water-cooling together in March, pressure test no leaks lovely jubbly. My memory and CPU loop keeps getting air pockets in the radiator which sits at the top of the case, Alphacool XT30 V2. I have a Corsair XD5 that sits below, then to my memory, then the CPU TechN which has no bubbles then to the radiator and back to the XD5. I only notice as the space I leave in the reservoir 2/3 inch reduces to 1/2 inch, give the case shake and tilt and bubbles appear from the radiator. I have my GPU on a separate loop and don't suffer the same problem at all, however the radiators 2x480 XT45 are on the front vertical and the XD5 is mounted on the radiator. Any ideas how to prevent this I'll appreciate.
It could be a scratch when I used a pipe wrench to do up the fitting. Those minor cracks around the fitting I reckon are thermal stress cracks, CPU gets very warm when pulling 275 watts.
I planned two loops as I thought the GPU and CPU would create a lot of heat and I didn't want the GPU and CPU to cook the RAM and make them error. As it is the GPU doesn't get hot 45-50'C, water 30-35'C on two rads and that loop is fine. The CPU can get warm when stressed with cinebench @ 82'C, while gaming it's perfectly fine around 60'C, water about 37'C. Somehow the air pocket in the reservoir is getting into the rad, I'll have to stop getting my CPU so hot and see what happens.
That sound card is on my little HTPC media thing 5700G, it makes my Sony XM2 headphones sound a lot better than onboard sound.
Your front rad is probably trapping air since it is the highest point of the loop. When you bleed the system you'll want to run the pump full speed to try to push the air out of the rad as much as possible. You can rotate the system around during bleeding (if possible) to try to trap the air in the res. If that doesn't do the trick you can switch the CPU rad to the front and rotate it so in/out are at the top as others have suggested. Or you can leave it alone, it will just take a long time to bleed all the air out.
Top rads are stubborn for trapped air. Isn't there an extra g1/4 port on the opposite end of the rad you could bleed the air out with?
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