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Please recommend a quiet pump for my loop

post #1 of 5
Thread Starter 
I currently have the following (or will within the weekend):

MCP35x with integrated reservoir -> (2) Aquacomputer GTX 780 GPU blocks (not sure if I can run these in parallel, but I am getting the appropriate bridge) -> XSPC Raystorm CPU block -> MCR220-XP Rad -> MCR320-XP Rad -> back to pump. I'm also using about 5-6 Koolance QDs (the high flow kind), and 1/2" ID tubing. Distilled water with PT Nuke.

I've had my MCP35x for just over two years now and my PC stays on 24/7, so I'm starting concerned that it could go soon. Also, I've read that the Aquacomputer blocks are pretty restrictive, so I'm not sure what I'm going to have to run my pump at for proper flow. Anything over about 35% PWM on the pump is pretty loud and annoying to me, and I'm pretty sure I'm going to need 40-50% to get good flow.

Any suggestions for a pump with built in reservoir - I have a Corsair Carbide Air 540 and it's pretty cramped? Quiet is my #1 priority. Cost is secondary (under $250 or so).

Thanks
post #2 of 5
I would buy another 35x. You can plumb them in serial and run both at low rpm. 1 35x should handle your loop fine. Look at wermad's build. He uses a single 35x.
Bow the lifetime on the pumps is 50,000 hours. That's 5 years if water temps are kept below 50*C.

*EDIT* - auto correst is dumb. changed wermad's name to we road...
Edited by pc-illiterate - 3/15/14 at 2:09pm
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w00t
(18 items)
 
   
CPUMotherboardGraphicsRAM
ph2 x20be asus m4a785-m sapphire vapor-x 4850  geil black dragon 1066 5-5-5-15-20 
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wd  asus dvd multi-write arctic cooling freezer 64 pro win 7 ultimate x64 
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samsung 42" lcd logitech wireless antec basic 500watt old dell crap 
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logitech wireless pioneer 7.1 
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post #3 of 5
Quote:
Originally Posted by Neon01 View Post

...Anything over about 35% PWM on the pump is pretty loud and annoying to me, and I'm pretty sure I'm going to need 40-50% to get good flow...

I originally mounted my 35x to the case and it really made some noise above 1800rpm. I have since decoupled it from the case with Tempurpedic Foam (sent off for free sample) and it now runs at 2800 and almost dead silent.

Now it's freestanding on it's base again and no more noise. The foam is better, but that's for my next build.
Edited by Tweakin - 3/16/14 at 6:53am
post #4 of 5
Thread Starter 
Thanks for the responses. I got it all up and running today with my single 2 year old MCP35x, and I'm not sure what the flow rate is, but I've got it at 34% pwm and the temps are great. With a 4.3GHz OC on my 4770k and a 100Mhz core clock OC on my GTX 780s (EVGA SC model), my temps don't go above 46 deg doing several Heaven loops. Idle is 23/25 deg. That's with my fans at probably 1000-1400 RPM, so I know there's room there to get better if I wanted, but those temps are just fine by me.

I took Tweakin's advice and put some foam on the inside of my case where the pump contacts and it did make a difference. Tried not to cover the bottom too much since I don't want it overheating.

BTW, does 3200 rpm on the pump sound about right for 34% PWM? That's what my motherboard util is telling me the pump speed is currently, but I've read those things can be off by a good margin.
post #5 of 5
Quote:
Originally Posted by Neon01 View Post

...BTW, does 3200 rpm on the pump sound about right for 34% PWM?

3200rpm would be closer to %70 of the full duty cycle as the pump peaks out around 60% pwm. If you look at Matrins Liquid Lab, it would be around 34% as per this graph



I use a heatsikt kit in my test rig...you can see where I used to have it directly coupled to the case...it got loud at times. The heatsink does wonders for the pump...you can see the results at Martins.



You might also think about mounting your pump on it's side as that will allow more air to cross the pcb area and keep it cool. I just cut a slit out where the mounting tab is on the pump and it just sites there...uber quiet...thank you Tempurpedic for the free sample!!!


Edited by Tweakin - 3/16/14 at 6:52am
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