So i just got a water cooling set up. on air with a Zalman Heat sync my idle temps were 28-30C and load were 60C.
on the water cooling setup my idle temps are the same and load was dropped to about 50C. i know i really shouldnt worry unless im up in the 80+C but still at Stock clocks you would think water would drop it about 10C+ load and idle.
or am i just expecting too much? lol
That sounds about right, going from air to water near stock settings and you saw 10C decrease at load and 1C or less at idle.
At idle, your cpu is only using 4-6 watts heat, and at load ~10-15x more watts at stock settings. The higher the wattage, the larger difference in cooling between water and air. The smaller the wattage, the smaller the difference.
For example air cooling, one site calculated thermalright true cooling as .15 C/W with 2000 rpm fans, and one dual rad water cooling was .03 C/W with 1800 rpm fans (just using these numbers as examples, will differ system to system).
At idle 6 W, the difference between air and water cooling on a system using above would be less than 1C.
At load of 80W, the difference would be ~ 10C (air cooling would be ~10C higher than water).
At load of 160W, the difference would be ~20C (air cooling would be ~20C higher than water cooling).
Granted that assumes linearity and other ignored errors, but it illustrates the point, at low wattage, idle, there should be almost no difference between air and water cooling, even if water is several times better cooling than air. From there, the higher the wattage, the larger the difference, especially true when start using quieter fans with high wattage, and especially when nearing or exceeding the cooling capacity of air.