I personally think the problem may be related to either a lack of pressure on the core or the water block may need to be lapped. You should get 10C delta between coolant temp and core temp. I am getting 15C with a 40% antifreeze coolant and a flow rate of 1.5L/min (18gal/hour).
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Athlon T'bird 1.33 AXIA Y @1632 (12x136)
Water cooled with refrigerated chiller; idle = full load = 3C Coolant = - 20C
MSI K7T Turbo Raid V3.0
256Meg Crucial PC133 RAM
350W Enermax
Diamond Viper V770 TNT2/Pro
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