Re: Please HELP
Good luck on the CPU waterblock. Tightening the mousing down more might help but remember that pure copper is softer than aluminum so you could be getting some bowing. Hmmm.. what copper alloy are you using? Some alloys aren't any better than aluminum at heat transfer, although they are much easier to mill than pure copper (too soft and the bits just get sucked into the material).
As for the video card, water should be better than air. However, I really don't know about overclocking them and how sensitive they are to temperature. Personally, I like the Accelero S1 with a 5V Nexus fan. But that is not overclocked. It might be that the S1 with a higher CFM fan could be better overall because it would cool the whole board more evenly. The S1's pack a lot of surface area to cool the GPU, and it's cheap. I've seen a lot of good press with regards to the S1 and how well it cools.
On the other hand, you might not have enough room for a pair of 8600GT's with S1's strapped onto them. Water cooling is great at moving the heat to a big radiator where you can more easily get that heat into the air. You will degrade your CPU temps a bit, though. It's probably a good tradeoff. I did that with my last watercooled system and liked it (overclocked athlon 2500 and an ati 9800).
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