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post #1 of 13 (permalink) Old 03-14-2010, 01:45 AM - Thread Starter
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guy i hope you can put this question to rest for me. i heard (and i cant remember where or when but it has been a while) that having a water pump that is two fast is just as bad as having a water pump that is two slow. something about it pumping the water to fast to be cooled or it not being on the water clock long enough to cool the PC. any idea if im just dumb or is this true?

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post #2 of 13 (permalink) Old 03-14-2010, 01:45 AM
It's still almost enough.
 
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Nope, it's not true. Water cannot be pumped so quickly that it does not transfer heat.


Combined air and water cooling tips: Fan database | My San Ace 9G1212H1011 review | Don't mix metals or use premixes / dyes | Distilled vs. tap water | Good radiator brands | Water (almost) can't flow too fast | Which PT Nuke to use | Regarding thermal paste spreading
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post #3 of 13 (permalink) Old 03-14-2010, 01:50 AM
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Quote:
Originally Posted by Chunky_Chimp View Post
Nope, it's not true. Water cannot be pumped so quickly that it does not transfer heat.
my pump is quite fast, when it comes out the rad and into the res you can hear and see the water hitting the glass, not sure if this is mormal but its coolling fine and id say its going pretty fast.

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post #4 of 13 (permalink) Old 03-14-2010, 03:01 AM
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if its fast it going to get back to the rad quicker and keep on doing so. quicker the better

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post #5 of 13 (permalink) Old 03-14-2010, 03:02 AM
It's still almost enough.
 
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Quote:
Originally Posted by Rian View Post
my pump is quite fast, when it comes out the rad and into the res you can hear and see the water hitting the glass, not sure if this is mormal but its coolling fine and id say its going pretty fast.
Right. I'll elaborate just for kicks, though;

Assuming you've filled and bled air from the loop, the water running through the tubes is a solid stream of thermally conductive liquid. However fast it runs, it will transfer heat to the radiator (for the fans to blow away) just as well slow as it would be fast; it all depends on restriction in the blocks. If it flows too slowly through the blocks, naturally this isn't a good thing. But moving too quickly isn't an issue, because it's the same solid stream; temps will not change above a certain flowrate (and this differs between each config so I can't tell you what that is).

An analogy you could use is a computer's CD player... you can spin the CD as fast as you want, but it won't play the music any faster unless you speed it up with software. Spin it too slow, though, and it won't play well if at all. This is because the laser knows how to adjust for the rotation speed; of course this is different as the flowrate in a water loop doesn't need to adjust according to temperature (although it is possible). Below a certain point, though, the laser is unable to adjust and playback suffers and eventually stops. Same deal with a water loop; too slow and temps suffer. But too fast and you won't actually notice how fast it's going because it won't be more efficient. This is why head matters more when selecting a pump for restrictive loops; it needs to get the water through the block(s) and radiator(s), and as long as it does that efficiently, the actual flowrate becomes a non-issue.

There's a better way to put this, but it's quite late and I'm about to fall asleep where I sit; I'm sure someone can detail it better.


Combined air and water cooling tips: Fan database | My San Ace 9G1212H1011 review | Don't mix metals or use premixes / dyes | Distilled vs. tap water | Good radiator brands | Water (almost) can't flow too fast | Which PT Nuke to use | Regarding thermal paste spreading
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post #6 of 13 (permalink) Old 03-15-2010, 12:04 AM
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With the types of pumps that we would use in PC watercooling, having too high of a flowrate is usually not an issue. One pump of the DDC/MCP kind are not going to run into any kind of issues.

It is possible however to have multiple pump setups that run into issues. Flowrates above 1.5gpm offer very little performance increases. What can happen when using multiple pumps is that the increased heat dump counters the only slightly better cooling at very high flow rates which can result in a slight drop in performance (think around 3gpm +). I have seen this happen with people that have tried to use 2 x MCP355 pumps in a very low restriction system, or 3 x MCP355 pumps in a higher restriction system. They could remove one pump and their temps would actually improve a bit. Briefly, this is because there is only a marginal increase above 1.5gpm, and the effective heat dump countered the only slighter temp decrease that a really high flow rate offers.
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post #7 of 13 (permalink) Old 09-09-2010, 03:30 PM
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Heat dumps this, and flow rates that.... No offense intended, but your all complicating what could be a simple matter OR over simplifying a SERIOUSLY complex equation.

You can either set up a loop with good parts and have confidence in your loop, or you can open up a liquid flow CAD program and spend countless hours calculating drag, resistance, force, flow rate, heat exchange, thermal conductance, thermal insulation, and so on and so on and so on.

Multiple (identical) pumps will increase head pressure (only calculable with a quadratic equation, it's NOT a linear formula), very minutely increase flow rate, increase thermal seepage (from the additional pump[s]) which again is only minute, and finally increase your total power consumption.

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post #8 of 13 (permalink) Old 09-09-2010, 03:37 PM
It's still almost enough.
 
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I see what you're getting at, but this is a somewhat old topic and I think the point was already made. Good for explaining it better, though, like I'd said I was sure it could be.


Combined air and water cooling tips: Fan database | My San Ace 9G1212H1011 review | Don't mix metals or use premixes / dyes | Distilled vs. tap water | Good radiator brands | Water (almost) can't flow too fast | Which PT Nuke to use | Regarding thermal paste spreading
Deep Blood
(15 items)
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CPU
Intel Core i7 920 D0 (Batch # 3901A240)
Motherboard
Foxconn X58 Blood Rage (non-GTI)
GPU
Sapphire Vega 64 8GB
RAM
6GB Corsair Dominator 1.6GHz TR3X6G1600C8D Rev 3.2
Hard Drive
Samsung SSD830 128GB / Seagate 640GB+2TB+2x4TB
Optical Drive
Samsung SH-S223Q 22X
Power Supply
Antec HCPP-850
Cooling
XTTH | OCZ Freeze | 9G1212H1011
Case
CaseLabs SM8
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Dell U2410f (rev. A02)
Keyboard
Code 104 w/O-rings + Vortex PBT/POM doubleshot keycaps
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post #9 of 13 (permalink) Old 09-09-2010, 08:11 PM
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I was not attempting to correct you or anyone aside from Voigts, multiple pumps ARE a viable solution for those who 1.have multiple reservoirs 2.have high head-travel lines 3.decided to cheap out with low head pressure pumps.

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post #10 of 13 (permalink) Old 09-09-2010, 08:14 PM
It's still almost enough.
 
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Yeah, I know. It's a good point to make when that XSPC X2O 750 has become so popular when its pump only has a third of the head pressure of a D5.


Combined air and water cooling tips: Fan database | My San Ace 9G1212H1011 review | Don't mix metals or use premixes / dyes | Distilled vs. tap water | Good radiator brands | Water (almost) can't flow too fast | Which PT Nuke to use | Regarding thermal paste spreading
Deep Blood
(15 items)
Soft Sentinel
(13 items)
CPU
Intel Core i7 920 D0 (Batch # 3901A240)
Motherboard
Foxconn X58 Blood Rage (non-GTI)
GPU
Sapphire Vega 64 8GB
RAM
6GB Corsair Dominator 1.6GHz TR3X6G1600C8D Rev 3.2
Hard Drive
Samsung SSD830 128GB / Seagate 640GB+2TB+2x4TB
Optical Drive
Samsung SH-S223Q 22X
Power Supply
Antec HCPP-850
Cooling
XTTH | OCZ Freeze | 9G1212H1011
Case
CaseLabs SM8
Operating System
Windows 7 Ultimate x64 SP1
Monitor
Dell U2410f (rev. A02)
Keyboard
Code 104 w/O-rings + Vortex PBT/POM doubleshot keycaps
Mouse
Roccat Kone EMP w/Dechanic Mini pad
Audio
Asus Xonar DX / Klipsch RM-14s + Dayton DTA-120 / MXL Tempo
Other
Microsoft Lifecam Cinema
CPU
Intel Core 2 Duo E6320
Motherboard
Intel DP35DP
GPU
XFX GeForce 7600GT
RAM
2GB Mushkin DDR2 800 5-5-5-12
Hard Drive
Seagate Barracuda 7200.10 320GB
Optical Drive
Asus 18x multi-burner
Power Supply
Enermax Liberty 400w modular
Case
Rosewill R5604-TBK
Operating System
Windows XP Pro SP3 32-bit
Monitor
Samsung LN-S2351W
Keyboard
Ideazon MERC
Mouse
Logitech MX-518 (rev.2; 1800 DPI [no Teflon feet])
Mouse
Xtrac Pads Ripper
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