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Need some advice of Flow Rates for a first time build.

post #1 of 5
Thread Starter 
I need some assistance on my new build. I have two loops. I will go through them one at a time.

CPU Loop:
EK Supreme CPU Waterblock
1 XSPC RX480 Radiator
1 MCP655 Pump with EK Top
1 Liquid Fusion Reservoir
1 Aquaero Flow Meter
7/16 ID Primochill tubing x 60” total length
Various Bitspower ½ inch fittings

Video Card Loop:
3 EK Waterblocks for GTX470 video cards in SLI mode
2 XSPC RX480 Radiators
EK motherboard chipset waterblocks for a GA-P67A-UD7 B3 mobo
1 Bitspower Ram Waterblock Block
1 MCP655 Pump with EK Top
1 Liquid Fusion Reservoir
1 Aquaero Flow Meter
7/16 ID Primochill tubing x 72” total length
Various Bitspower ½ inch fittings

The problem is low flow rates. The Aquaero flow meter on the CPU loop shows .8 gallons per minute and the Aquaero flow meter on the video card loop shows .4 gallons per minute. I do believe these to be somewhat correct, at least in the sense that the one looks like it is flowing about twice as fast as the other. I also realize that there are some potentially restrictive blocks on the video card loop, the two radiators adds a lot plus it is quite a lot of tubing.

I have seen a few times where people recommend not going much below 1 gallon per minute. My video card loop is not even close to that. However, I have done stress tests on the CPU and video cards and all of them are at about 32C at idle and 50C under load. The temperatures seem very good. I am just wondering what everyone’s thoughts are. I just hate the thought of tearing down to look for something blocking a passage, such as radiator flux. I did flush a lot before the build.

Here is a pic just to give a visual of the setup.

359

Fire away,
John
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post #2 of 5
Suggestion #1: If you went with the two pumps in series and one loop. Reduce tubing as much as possible it might help with flow.

Suggestion #2: Could you add one pump to both loops and put them in series, it might help.

Question: Is that EK bridge a series or parallel one?
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post #3 of 5
Thread Starter 
Quote:
Originally Posted by Rognin View Post

Question: Is that EK bridge a series or parallel one?

It is two pieces and is setup in series. Both loops are completely series.

Thank you,
John
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post #4 of 5
Quote:
Originally Posted by jcrouse View Post

It is two pieces and is setup in series. Both loops are completely series.
Thank you,
John

Setting up the vid cards in parallel might net you some better flows through out the loop. And getting one loop with shorter tubing will also net considerable gains. The temps shouldn't be all that different, unless you care about 1 or 2 degrees.

I went from this
450
to this (sorry I have no recent pics yet...)
450

I went from .75GPM to 1.5GPM, so shorter tubing will help a lot!
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post #5 of 5
1GPM is nothing really magical, it's more of a suggested number where you could experience problems with bleeding, etc.

If thermals are ok and you don't see any trapped air pockets, call it good:thumb:
    
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