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Old September 17, 2009, 11:11 AM
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Default how many rads can a 655 push through

I have a 655 pump and am wondering how many rad can it push water though. the reason I am asking this is because I want to add my Video card when I get it back I currently and using a 220 rad for my cpu block and am wondering if I can hook up another 220 rad for my vid card or will I have to get an additional pump and run a second line?
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Old September 17, 2009, 11:57 AM
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i'm pushing a huge loop with a single mcp655. CPU,GPU 240 rad and giant (3 foot x 2.5 foot)passive rad. Been doing it for a year now no problems.
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Old September 17, 2009, 11:58 AM
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Dozens.

Seriously, even the worse of the commonly available radiators are far less restrictive than waterblocks. And a 655 will push through a couple blocks and rads without breaking a sweat. In fact, once you get things up and running, feel free to try one of the slower speeds (if you have the speed adjustable version) and see if it actually changes your temps at all.
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Old September 17, 2009, 12:05 PM
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exactly. Better flow does not equal better cooling. Coolant needs to spend some time in contact with the heat to absorb it. When we removed the thermostat from our race car we had overheating problems until we put a restrictor in place of it.
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Old September 17, 2009, 12:59 PM
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Quote:
Originally Posted by Squeetard View Post
exactly. Better flow does not equal better cooling. Coolant needs to spend some time in contact with the heat to absorb it. When we removed the thermostat from our race car we had overheating problems until we put a restrictor in place of it.
This statement blew my mind a little bit.

I mean it makes sense and everything, but wow.
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Old September 17, 2009, 01:16 PM
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I should've said better flow does not ALWAYS equal better cooling. There are a lot of factors. But we are dealing with a closed loop system with no evaporation effect.
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Old September 17, 2009, 01:41 PM
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I have: Supreme - Triple rad - two of fullcover video - two of mosfet - chipset - reservoir - everything on 655 which I can ran at speed 2. You are fine.
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Old September 17, 2009, 01:44 PM
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cool now when ever I get my Motherboard I will and my vidcard I can add to the loop :)
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Old September 17, 2009, 02:32 PM
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Quote:
Originally Posted by Squeetard View Post
exactly. Better flow does not equal better cooling. Coolant needs to spend some time in contact with the heat to absorb it. When we removed the thermostat from our race car we had overheating problems until we put a restrictor in place of it.
GM small-block? Several of them have known issues with excessive pump flow, but it has nothing to do with the "needs to spend time in contact with hot surface" theory, and everything to do with badly designed coolant passages.
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Old September 17, 2009, 09:52 PM
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Quote:
Originally Posted by Squeetard View Post
exactly. Better flow does not equal better cooling. Coolant needs to spend some time in contact with the heat to absorb it. When we removed the thermostat from our race car we had overheating problems until we put a restrictor in place of it.
I have to disagree on the "time contact to absorb heat." Perhaps this is an isolated case due to excessive flow creating mini-eddies through the cooling system.

IIRC. Heat is the excitement of atoms in a material. Major factors of cooling are thermal conductivity of the medium, surface area of dissipation, and Delta T. As water rushes by cooling matrices, the water molecules have higher entropy (in layman's terms, it'll bump against the heated material more often, therefore increasing the rate of energy transfer). A higher flow will allow the loop to transport those energized water molecules to the radiator where the heat will be dissipated via the reverse process.

Slower rate of flow will hinder the rate of which water can dissipate the heat carried. Therefore, increasing the average temperature of the water, therefore decreasing cooling potential by having a smaller Delta T.

Worst case scenario, water will go under high turbulence when met with the cooling matrix (such as the case for a badly designed waterblock). Where the water will be recycled through eddies, and cooling potential decreased dramatically.

/rant
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Last edited by Jackquelegs; September 17, 2009 at 10:00 PM.
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