Quote:
Originally posted by unregistered
define series 1, 2, & 3; is that the vcore ? (C, D, & E)
so the load temps dropped at 3/E ???
look at the air/water differential - ?? (should be increasing as the load increases)
2.2, 4.2, 3.0 ????
at the same flow rate, with the same die size, the C/W will be the same at all power levels
(hundreds of tests this way; if your's are not, there is an error)
what is "Ambient load Temp" ? = air temp under load ?
Water the same ?
you have too many uncontrolled variables
-> unless you REALLY like multivariant analysis (which I do NOT)
and you'll need a LOT of data points
|
A quick glance up at the numbers represented by each line in the chart will show you.
But here goes
There were three tests taken in all, variables being room temps noted at each test and each test at a different heat output. The three resulting C/W's are added together and averaged for the resultant (C) for water and (C) for air, hence the two C/W's.
Series 1 is the numbers taken from the chart for "ambient temp" which is the air temp measured at the rad(the at the rad part I failed to make a note of in the chart)
Series 2 is is the water temp at load
Series 3 is the P4 cpu die temp reading
There are 3 numbers for each series, one taken at a different vcore/mhz as noted in the chart.
.168, .174, .224
I got these readings (computernerd watts)as you can see,
@ stock = .224C/W
@ 81w = .174
@ 101w = .168
They are then averaged to .189C/W
I am well aware that heatload does not change C/W but these are the repeatable readings that I get, a tendency towards higher C/W at lower wattage. Perhaps the wattage used in the equation is buggered? But you can see from my chart the conclusions people will come to by doing their own testing. My water temp sensor has a resolution of .1C and as you know the P4 die reading is a .5 resolution.
I included the three most commonly quoted wattage figures that people have seen in the bogus reviews across the web. I am not claiming that what my chart says is the real C/W of the block, just what I am able to measure on my system with the thermometer that I have.
The room temps were different when each test was taken, as noted. The middle load air to water differential is greater (and room temp was also greatest) and it does bother me, but that is what I recorded. This is only one seating and the purpose of my posting it was to the question at hand, does the average user see a cpu temp of 10C above room temp when watercooling? I propose not, even though my test is not valid when compared to yours BillA
I do not believe I am off by 10C
