Nice work bro i was following it for a long time and the only thing that i can say is mind-blowing. For your os drive question C300 is wary good drive has better 4k random read than any new drive except Corsair Force 3. So if you want to upgrade than go but it's pure epeen you not gonna see any difference. I have question. How do you bleed your loop with black tubes? I understand when tube is see-trough you can see the bobbles.