[MeltMan]

Hey hey hey, dont give up yet. Its a DAY old. You need to take a deep breath and find where your weakness lies. I think your weakness may be that weak waterblock on the computer. If you think you are going to try pelts, the only way you will get good results is to watercool the pelt. You're stuck watercooling either way to get good results. Your pump is very weak, and your waterblock is el-cheapo. I think these are your weaknesses.

Tubing size will not make much difference at all.

Was the heatercore NEW? It is most likely not your weakness. Heatercores are great cheap rads.

A rio180 is a very underpowered pump. Are you getting any flow at all? Have you done a test loop to see your flow after the rad?

The waterblock should be effective, but only with sufficient flow. It is aluminum, so give it a break. Take your hand and feel the waterblock. Is it warm? If it is, you are having low to no flow. If it is cool, then there is an interface problem between it and the chip.

Do these things, and post again.