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MCP355 died, possible causes? - Page 4

post #31 of 48
Quote:
Originally Posted by pc-illiterate View Post

because it isnt designed to be in a damned pc case. its an aquarium/pond/solar pump the same as a d5.
i used to think you were pretty smart about this stuff. youve shown in this thread i was wrong.

Those would only be even higher flow environments I would have thought.
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post #32 of 48
Lmao, I haven't seen so many old sponge setups in one post, it's as if it's a time warp. We know better now.... lol.
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post #33 of 48
Quote:
Originally Posted by Jakusonfire View Post

Those would only be even higher flow environments I would have thought.

These guys are cooled by water flow. Higher flow rate should help keep it cool, not the other way around.

At any rate, there is a reason that when they replaced the 355 with the 35x that they started selling them with heatsinks strapped to the bottom.
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post #34 of 48
^^Optional. There's a reason Swiftech in their wisdom saw fit to make and sell a heatsink. Or maybe they don't know jack about pumps too?
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post #35 of 48
Quote:
Originally Posted by Zero4549 View Post

These guys are cooled by water flow. Higher flow rate should help keep it cool, not the other way around.

At any rate, there is a reason that when they replaced the 355 with the 35x that they started selling them with heatsinks strapped to the bottom.

Ohhhh, OK. So, uncovered base and higher flow is the solution. Bear with me, I'm taking notes so I can be smart again.


I hate to inject actual useful information but if you look at Martins testing of the Swiftech 35X heatsink. The heatsink (with a fan) made a 14C difference to temps at 1.5GPM vs the pump running flat on the table.
Higher flow rates of course made a much bigger difference, and the OP's loop would have been running under 1.5GPM.
Edited by Jakusonfire - 1/11/15 at 10:52pm
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post #36 of 48
Thread Starter 
How is low flow-rate a problem? Its been proven time and time again that lower flow-rate has very minimal impact on cooling performance for either blocks or rads. Thus wouldn't the same be true for pumps?

Unless of course the lower flow-rate makes the pump work harder or something...does it?
    
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post #37 of 48
Quote:
Originally Posted by Klue22 View Post

How is low flow-rate a problem? Its been proven time and time again that lower flow-rate has very minimal impact on cooling performance for either blocks or rads. Thus wouldn't the same be true for pumps?

Unless of course the lower flow-rate makes the pump work harder or something...does it?

No of course not. power draw of the pump and heat is directly related to water flow rate.

This thread has devolved into people just talking without a clear idea of what they are talking about unfortunately.
If you had changed your pump from flat on the floor of the case to a heatsink with a fan to force airflow it would have made less than 14C difference. According to the experts here that must be the difference between "will overheat" and being fine rolleyes.gif


Edited by Jakusonfire - 1/12/15 at 12:09am
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post #38 of 48
Thread Starter 
That's interesting, the flow rate through the blocks was definitely very low. I don't have any hard numbers but I could tell there was very little resistance or "feel" of water flowing through the return line to the pump. Just as a reminder to everyone, this pump was pushing through 2 360mm rads as well as 4 cpu blocks so flow rate couldn't be too high.
    
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post #39 of 48
radiators have almost no restriction.
water flow rate through a ddc pump means nothing for cooling it. water flowing at .1 lph cools a ddc pump as much as 250 gpm. the pumps are air cooled.

14*C is a hell of a lot of heat. stop and think about it.
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post #40 of 48
Quote:
Links to DDC’s melting down

I thought the following is a good example of the extreme heat causing problems for some folks:

http://forum.hardware.fr/hfr/OverclockingCoolingModding/Water-Xtreme-Cooling/pompe-laing-prend-sujet_277053_1.htm

Conclusion

It appears the FETs and coils run the hottest on the pump and the IC is of little interest. Also the center of the pump base is not very representative of the hottest areas. I will see what I can do about placing a probe or two near the FETs and coil area inside the pump casing. A high restriction system at 1GPM only measured roughly a temperature of Ambient +35C while the very low restriction 3GPM condition resulted in almost twice the delta of Ambient +55C. I’m beginning to think heat removal via a heatsink is more important than most people think when running DDC pumps with tops. The factory Laing top will restrict that max flow rate, but once opened up via a pump top…the heat is ON!

This is a bit preliminary, but it may also make more sense to design a balanced system of pumping power vs restriction. Too little restriction under full power is apparently making these DDC pumps with tops heat up, while too much and you could have bleeding problems and reduced thermal performance. Shooting for 1-1.5GPM or so with DDC pumps, may be a good target to keep heat in check.

More testing to come….I will be exploring heatsinks and air flow scenarios soon. I just need to find some fine wire to solder a few probes inside my DDC for testing enclosed.


Maybe Martin doesn't know what he's talking about too?


http://martinsliquidlab.org/2011/05/30/ddc3-2-pump-heat-scoping/
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