The blocks are fairly identical. Unless, if small unnoticed changes can affect. Nevertheless, I really could not find any difference in mm scale.
For both of the blocks, I used a sand paper-glass method to flatten the blocks (the contact area).
It can be due to the break-in period of AS5 which I did not account for. At most, I am expecting 3degree change with that. I am expecting similar performance of Al and Cu at best.
It is not due to mounting pressure, I am sure about that. I can try over tightening it.
Currently, it has just distilled water. No additives. I just want to cleanse the new tubing and reservoir. I will drain it and add coolant with anti microbial.
Ohh and do advice me for 8600GT 512MB SLI card. Should I just add a fan or go water? I will be overclocking it. Keep in mind that I will homebrew the water block.
LINK:
http://global.msi.com.tw/index.php?f...30&cat2_no=136