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Question about temp delta?

D

dewhite

Gawd
Joined
Sep 13, 2002
Messages
812
I posted a thread here last week about my first attempt at water cooling. At the time when I finished my setup the only available BIOS revision for my board (K8N Neo) was unable to properly read system temps.

MSI finally released a BIOS that seems to get the temps pretty close to reality (I know of course that any temp begotten from onboard sensors is questionable). I'm pretty pleased with the results that I'm seeing, but I have a couple of questions.

My idle temp is around 34c, and the loaded temp settles around 46c (assume 22c room temp). Is a gap that large between idle and load temp pretty normal? Coming from the world of high performance air cooling I'm used to seeing a smaller gap between the two.

Next question: Is it normal to see the temp snap from idle to load in 1 or 2 seconds? I'm used to watching the temperature climb slowly up as the energy being dissipated into the sink is absorbed fully. Likewise, when the load is removed it usually take a while for the fan to convect all that enery back out of the copper/aluminium. I can understand how a water system would be able to cool down more quickly, but it caught my eye that I went form 34c to 46c in less than 1 second using prime95...

Next semi-related question is: Given that I'm using an asetek KT03L20 setup, what needs to be replaced first to make improvments? I'm pretty set on using the BIX 120mm rad as it took alot of work to get it mounted in my case. Similarly I don't need a jet engine under the desk so the fans are staying at 7v. So, would an L30 pump make some difference? Would going to like a TDX, or antarctica block help more? (I'm pretty sure the answer to this question is going to be - if you upgrade blocks, you're going to have to upgrade pumps anyway -- but this is why we ask, to know more...)

Thx for reading, know I ended up turning a simple question into an encyclopedia entry...
 
I have a 10C delta, and my HC is completely inside the case with only a single fan on it.
The temp rise/drop is pretty immediate aswell. I was a little alarmed with that at first, but it seems to be normal.
 
A slow rise in response to load is characteristic of in-socket thermistors--it takes a while for the heat to get to/from the sensor. A rapid change is characteristic of on a on-die thermal diode--it's right there where the heat is produced and responds quickly. For comparison, think about how rapidly the temperature of a light bulb filament changes, compared to the changes of the lamp it's screwed into.

Cool-n-quiet can give you a big difference between load and idle (by having the CPU use less power at idle), but I'd say it's because your KT03L20 is wimpy.

L30 is okay, Dangerden's D4 or Swiftech's MCP650 is better. If you want to try a block only upgrade, get the MCW6000; does better at low flow than the TDX.
 
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