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Old January 26th 17, 03:10 AM posted to alt.comp.hardware.pc-homebuilt,alt.comp.hardware.overclocking
B00ze
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Default Overclock 6700K Max Temps Prime95 Small FFT

On 2017-01-25 05:15, Paul wrote:

Your curve seems to have a longer rise time than mine,
almost as if the cooler is being "overwhelmed".


It's a "bug" in SpeedFan - I tried again and this time I added the CPU
Cores to the graph: They shoot-up to 88C immediately, while the line for
"CPU" slowly slowly slowly rises.

Heatpipes have a limited thermal pumping capacity.
If you manage to keep all the working liquid in the
vapor phase (no chance to condense), then the temperature
shoots up. The heatpipe has some sort of "watt rating",
over which it's probably not going to pump heat like it should.
Each heatpipe has two drops of fluid in it - there isn't
a couple of ounces of the stuff. Heatpipes can also leak and
fail, but that hasn't been a problem for years and years.
Manufacturers have figured out how to make good heatpipes.
When heatpipes were still a novelty, at least one product
shipped with no fluid in any of its heatpipes. Making it
gutless.


They barely get hot to the touch tho, which I find strange - on my
laptop the exhaust vent becomes really hot immediately when I run
Prime95, not so on the Noctua cooler in my rig, it just becomes warm'ish
- I mean it's higher than room temp, but I can leave my hand there
forever and never feel the need to remove it because it's too hot...

You could try a more powerful fan on the cooler.


Yeah, I thought of that too - the Hyper EVO has a much faster fan, but I
don't know, Noctua fans are supposed to be good. Oh well, I guess I will
live with it. The only thing that worries me is whether I have bent the
CPU's PCB or not - if not bent then fine, it's how it is. And if I did
bend it, well I'm not buying another one, lol, so I will just accept
that it gets hot under Prime95.

The other issue with these designs, is "no cowling".
Mine doesn't have one either. A cowling on the heatsink,
would ensure that any static pressure the fan can develop,
goes through the fins.

Since I own a 37.5mm thick fan, if I had to attempt a retrofit,
I'd do a sheet metal cowling, plus fit the 37.5mm thick fan.
That's to get as much air velocity as possible through the
fins. I've only done one cowling/shroud for a CPU cooler here,
in the time I've worked on computers.

Air cooling goes asymptotic over about 800LFM (linear feet per minute).
Run of the mill electronics, might use around 200LFM. So there
is a point, where "mo fan" does "no good".


Regards,

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