Quote:
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Originally Posted by freeloadingbum
JoeC's results show the hydrostream HS5 performing .134c/w at .3gpm while the mcw6000 performed .136c/w at 1.5gpm
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Sorry - you made a mistake somewhere.
For the HS5
At 0.3gpm the HS5 is 1.2C warmer than at 1gpm.
At 1gpm, at 70W heat load, the die rise must have been 70 x 0.122 = 8.54C
So at 0.3gpm, 8.54C + 1.2C = 9.74C
9.74C at 70W is a C/W of 0.139
For the MCW6000
At 1GPM the C/W is 0.141. At 1.5 GPM it is 0.5C cooler.
70 x 0.141 => 9.87. 9.87 - 0.5 = 9.37
9.37 / 70 => 0.134
I admit that they are fairly close, however the MCW6000 is not a true "high flow" block, it really is an intermediate block, something that straddles the middle ground, and quite intentionally by Bill too I believe.
Pressure Drop
However, if we start to take pressure drop into the equation, and compare to, say, the Danger Den TDX. Refer to math above for the C/W's derived below.
TDX @ 1.5gpm => 0.123 C/W
TDX P.D. @ 1.5gpm ~= 0.76mH2O (rough approximation)
Hydrocool HS5 @ 1gpm => 0.122 C/W
HS5 Pressure drop @ 1gpm => 2.47mH2O (measured by JoeC)
Gets interesting doesn't it?! The HS5 requires over 3 times the pressure drop to perform even as well as the DangerDen TDX.
Okay, let's drop the HS5 back to 0.5gpm and look at the figures there:
HS5 @ 0.5gpm => 0.133 C/W
HS5 Pressure drop @ 0.69mH2O (rough approximation)
Look at that! At about the same P.D. the HS5 is actually quite a way behind the TDX. Now look at the TDX results at 1.5gpm next to a number of other blocks in Phaestus's tests.
Look, the HS5 is a good block, no doubt about it. It does represent what is good about micro/mini-channels in that it has nice low-flow properties. It is perhaps the only block out there that we have enough evidence to show that it does fit the bill of providing within 1-2C of a high-flow setup's performance
against certain blocks,
but it does come at a very high pressure drop cost that MUST be not be ignored.
What we do need to be very careful of JoeC's OC.com results is that he does give you enough information to make a decision, it's just that it is more than a little confusingly presented, and for the average person, almost misleadingly presented.
Given the relative level of (un)availability of the HS5,
and that it is silver, perhaps a more fair comparison would be when I get the silver version of my Storm block out and about in a couple of months, or perhaps at the very least, comparing it next to a Cascade SS and do so with taking pressure-drop into account.