I also get about 60c temperatures on my 6800 ultra at 425/1.1 under load with an MCW50 block, flow rate is around 2L/min. This isn't unreasonable since I run my system fairly warm to cut down on noise.
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Originally Posted by brucoman
62c on the 6800? my 6800 GT at 410/1.1 with the same waterblock runs at 49c during 3Dmark03... perhaps need more flow still, try without the NB block, better yet get a second pump in series
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MaxxRacer your understanding of pressure and flow are not correct. No matter in what order you put the CPU block in the system you are going to get the same rate of water flowing through it. The rate of water flow through the block will generate a pressure drop across the block that is related to it's flow resistance. That pressure differential across the block is the only pressure that the block can see, it knows nothing about what other pressures are in the system. If the water flow is unchanged in the system, the pressure across the block is unchanged no matter where you put it, and the water velocity in the block is unchanged.