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swiftech MCP355 gettin hot

post #1 of 13
Thread Starter 
I know these pumps run warm, but it seems mine is running REALLY hot.
I am also running a 350 and that too is somewhat warm, but nothing like my 355. Does anyone else have a 355 pump that gets really hot? I usually have a fun blowing over them but still...
I also just got the DDC acrylic pump top (which is huge) so I am hoping maybe that will help a tad, idk. What I do know is 37$ for that little heat sink kit is way overpriced.
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post #2 of 13
The Swiftech one is only $14.95? And no, i just felt my 355, been running 24/7 for over 2.5 years? Its cool, and theres no air flowing over the bottom either.
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post #3 of 13
Thread Starter 
I wonder why mine gets so damn hot, I took it apart, cleaned the hell out of it and replaced the o-ring too. also, that little heatsink wont do much but the kit they make prob would. The kit allows for the PCB to make direct contact with the heatsink. the other one is just slapping a piece of metal on the bottom side.
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post #4 of 13
Quote:
Originally Posted by qbical View Post
I wonder why mine gets so damn hot, I took it apart, cleaned the hell out of it and replaced the o-ring too. also, that little heatsink wont do much but the kit they make prob would. The kit allows for the PCB to make direct contact with the heatsink. the other one is just slapping a piece of metal on the bottom side.
Restriction has a high effect on the heat generated by the pump. Try putting on Switfy's massive sink?
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post #5 of 13
Quote:
Originally Posted by qbical View Post
I usually have a fun blowing over them but still...
You enjoy blowing over your pumps?

Quote:
Originally Posted by qbical View Post
I also just got the DDC acrylic pump top (which is huge) so I am hoping maybe that will help a tad, idk. What I do know is 37$ for that little heat sink kit is way overpriced.
Yes, the DDC pumps often run hot.

Actually the pump top might hurt rather than help. These pumps use more power when the flow rates are high than low. Sounds counter intuitive but it is true. So in a low restriction system, or with a high performance top, you are going to increase the power draw of the pump, making it hotter.





You can do all sorts of things to cool them down a bit, like mounting a fan under them or sticking some RAM sinks on the bottom of the casing (it helps a little). You could also try undervolting them a bit if you wanted; you are probably over 1GPM anyway so the lower flow rate isn't going to hurt your temps.
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post #6 of 13
Quote:
Originally Posted by GingerJohn View Post
...

Yes, the DDC pumps often run hot.

Actually the pump top might hurt rather than help. These pumps use more power when the flow rates are high than low. Sounds counter intuitive but it is true. So in a low restriction system, or with a high performance top, you are going to increase the power draw of the pump, making it hotter.

...

You can do all sorts of things to cool them down a bit, like mounting a fan under them or sticking some RAM sinks on the bottom of the casing (it helps a little). You could also try undervolting them a bit if you wanted; you are probably over 1GPM anyway so the lower flow rate isn't going to hurt your temps.
Thank you for the info, you answered (almost) all of the questions I was meaning to ask here.

I'm sorry if I missed this bit, but when the pump heats up, I wonder if it has any significant impact on the water temperature?

I have the MCP35X and at first the pump bottom was almost searing hot and now I understand why. I then installed the Swiftech heatsink (22,40€ here), placed the pump on the airflow path of my case fans and reduced the pump rotation via PWM (MCP35X) so I suppose I don't have to worry about it anymore.
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post #7 of 13
Thread Starter 
Quote:
Originally Posted by GingerJohn View Post
You enjoy blowing over your pumps?



Yes, the DDC pumps often run hot.

Actually the pump top might hurt rather than help. These pumps use more power when the flow rates are high than low. Sounds counter intuitive but it is true. So in a low restriction system, or with a high performance top, you are going to increase the power draw of the pump, making it hotter.





You can do all sorts of things to cool them down a bit, like mounting a fan under them or sticking some RAM sinks on the bottom of the casing (it helps a little). You could also try undervolting them a bit if you wanted; you are probably over 1GPM anyway so the lower flow rate isn't going to hurt your temps.
it was late when I posted that so take-off eh lol

thanks for all the info. I was hoping that the greater surface area would help the heat dissipate, but I also know acrylic doesn't transfer heat that well. I usually have the pumps raised up a bit with a an old CPU fan blowing behind them. Guess I can return that pump top
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post #8 of 13
Thread Starter 
Quote:
Originally Posted by nostalgia View Post
Thank you for the info, you answered (almost) all of the questions I was meaning to ask here.

I'm sorry if I missed this bit, but when the pump heats up, I wonder if it has any significant impact on the water temperature?

I have the MCP35X and at first the pump bottom was almost searing hot and now I understand why. I then installed the Swiftech heatsink (22,40€ here), placed the pump on the airflow path of my case fans and reduced the pump rotation via PWM (MCP35X) so I suppose I don't have to worry about it anymore.
yes the heat definitely will have an impact on the fluids temp
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post #9 of 13
Already lost one 355 and had to buy another one as to computer down time.

Wish had taken it apart to see why but worried couldn't get it warranteed
if I did.
Gabe sent me a new one and have it at the ready if happens again.
Cores went to a little over 90c before I caught, no biggie

Run Core temp now and set to 80c as to warning and shut down.

Comes with water

Later
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post #10 of 13
Thread Starter 
Quote:
Originally Posted by nostalgia View Post
Thank you for the info, you answered (almost) all of the questions I was meaning to ask here.

I'm sorry if I missed this bit, but when the pump heats up, I wonder if it has any significant impact on the water temperature?

I have the MCP35X and at first the pump bottom was almost searing hot and now I understand why. I then installed the Swiftech heatsink (22,40€ here), placed the pump on the airflow path of my case fans and reduced the pump rotation via PWM (MCP35X) so I suppose I don't have to worry about it anymore.
Quote:
Originally Posted by Irocing View Post
Already lost one 355 and had to buy another one as to computer down time.

Wish had taken it apart to see why but worried couldn't get it warranteed
if I did.
Gabe sent me a new one and have it at the ready if happens again.
Cores went to a little over 90c before I caught, no biggie

Run Core temp now and set to 80c as to warning and shut down.

Comes with water

Later
can you elaborate on your experience please? Did you have a faulty pump, was it jammed, etc...?
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