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I was wondering if i could do this with the xspc res/pump

post #1 of 7
Thread Starter 
I was wondering if i could just turn off the stock pump that came with the kit and use a Swiftech MCP655-B instead... so i will be basically using it as just a res.

Would that give me any problems or should i be ok? I am asking btw because i am planning to get a water block for my 590 and maybe a extra rx240 rad
Galbus
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Galbus
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post #2 of 7
no, just get another res. the pump would ad tons of restriction when off
post #3 of 7
I don't think the pump would add much restriction, if at all. Centrifugal pumps, especially the XSPC bay reservoir one never fully block the inlet or outlet. Compared to a waterblock, their restriction is negligible.

On a side note, a 655-B is slightly weaker than the XSPC 750 anyways so unless you are concerned about noise I would stick to the XSPC pump.
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Labor of Love
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post #4 of 7
Thread Starter 
really?

i thought the 655-B was better :http://www.pureoverclock.com/review.php?id=889&page=6
Galbus
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Galbus
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post #5 of 7
Flow rates are only half of the equation of a pump's power. Much like the power of elecity is the product of the current AND the voltage, the power of a pump is a product of the flow and pressure. Comparing pumps at 0 pressure like Pureoverclock did produces unrealistic results that do not represent reality. Additionally, they tested the more powerful 655. The 655-B is a 655 without speed control that always runs at setting 4, compared to the setting 5 that the 655 runs at.

I have compiled the results of a lot of pressure drop vs. flow tests at the ideal flow rate for a loop, 1.0 GPM (higher is fine, but it does not lead to lower temperatures).

MCP355 + XSPC Top: 6.14 PSI
MCP35X Stock: 6.13 PSI
MCP655 + EK Top: 4.95 PSI
MCP655 Stock: 4.72 PSI
MCP355 Stock: 4.63 PSI
MCP350 + Top: 4.48 PSI
DCP 4.0 Stock: 3.83 PSI
XSPC 750: 3.59 PSI
655-B + EK Top: 3.38 PSI
MCP350 Stock: 3.25 PSI
655-B Stock: 3.23 PSI
DCP 2.6: 2.55 PSI
DCP 2.2: 2.08 PSI

For reference, your average waterblock is around 1 PSI of pressure drop, except for motherboard blocks which are usually 2-3.
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Labor of Love
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post #6 of 7
Thread Starter 
Thanks! so what would you recommend for a cpu/gpu block with a 1x 360 and 1x 240 rad?

+rep

it looks like the 355?
Galbus
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Galbus
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post #7 of 7
While the 355 is the strongest pump, it is not always the best choice. Out of all of the pumps listed, it is the noisiest. With an aftermarket top and proper mounting it can be pretty quiet, but still slightly louder than a 655. This will only be a problem if you want to run fans under 1000 RPM.

The 355 + Top, 35X, 350 + Top, 655, 655-B and XSPC 750 would all be powerful enough for your loop. You have to compare other factors such as noise, power consumption and form factor.

My vote goes to a MCP35X, but at $90 it isn't a cheap pump. It is a top performer and it's PWM control makes it easily the quietest pump when properly controlled. It is also more energy efficient than any of the other pumps. A 350 + Top would only cost around $60-70 and would also be very quiet, low power and reliable.
Labor of Love
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2600k @ 5.0 GHz/1.42v ASUS P8P67 Pro MSI GTX 670 OC 20 GB/1600/7-7-7-24 
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120GB Vertex SSD Western Digital 1TB None! Ubuntu 12.04/Win8/OSX 10.8.2 
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27" 1440p X-Star OCN Mechanical - MX Browns Seasonic X-560 800D w/RX480 top mounted 
Mouse
Logitech USB Generic 
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Labor of Love
(14 items)
 
  
CPUMotherboardGraphicsRAM
2600k @ 5.0 GHz/1.42v ASUS P8P67 Pro MSI GTX 670 OC 20 GB/1600/7-7-7-24 
Hard DriveHard DriveOptical DriveOS
120GB Vertex SSD Western Digital 1TB None! Ubuntu 12.04/Win8/OSX 10.8.2 
MonitorKeyboardPowerCase
27" 1440p X-Star OCN Mechanical - MX Browns Seasonic X-560 800D w/RX480 top mounted 
Mouse
Logitech USB Generic 
  hide details  
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