Liss said:wut bout the water right wen it comes out of the outlet.. ???
Since87 said:If the you have a water chiller keeping the water at a constant temperature, (say 25.000C) then knowing the output temperature in combination with the flowrate of the water would be meaningful information.
In a typical block->pump->rad->block loop, the water temp is combination of; the blocks ability to move heat from the CPU to the water, and the rad/fan's ability to move heat from the water to the air.
so if I measure the water temp and it is fairly constant then if i knew the output temp. and flowrate that would be meaningful?
or still no because the other components of the system would be adding some 'error' effect??
how about temporarily hooking up a hose to the sink and running water straight through just to get some measurements like you suggest in the top part of your post?
Thinking about this is making my head hurt.
Have you read the flowrate sticky? That, combined with everything BillA has written, probably covers every significant issue involved.
ok sorry, i was just wondering if it could be done or not. i'll try to look up some more research on this later.
I HAVE read the entire flowrate sticky, but i think I need to read again, as that was a couple months ago and i probably forgot most of it...
thanks for your help though. i don't want to make your head hurt though.
gone_fishin said:Ok, take the water temp and the cpu temp when at full load(use an app such as K7 or cpu burn-in, they are much better than seti). Subtract the water temp from the cpu temp (on die is much more acceptable than socket thermisters) to get the delta (difference). Now you must know the wattage (how much heat you are moving) in order for this information to come together. This is all assuming that the rad air intake temperature remains constant so that the system can reach equalibrium. Divide the wattage into the delta and you get a C/W number. This number is useless to other people's systems (because of variations from system to system) but if you were to take another block on your same system and do the same procedure, you can get a rough comparison (both blocks should be equally lapped at the base). This is only after mounting each of the two blocks numerous times and recording at each mounting. The reason you need to do multiple mountings is that the tim joint will never be the same between any two given mounts. If you have multiple mountings and take the best reading from each set of data for each block, you are at least attempting to minimalize the variation in the tim joint (which can swing your readings +-3 to 5C).
Recording the ambient rad air intake temp along with it will serve to validate the readings (most people who do this often can spot BS a mile away if given the full set of data.)
Edit to add:
When you are done with your comparison, it will only be good for the specific flowrate induced by the pump you are using because blocks performace changes along a curve with flowrate. Each blocks performance curve is likely to be different and you will not know this curve unless you test with different flowrates.