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Laing D5

post #1 of 6
Thread Starter 
I decided to replace my pump and MPC355 I think with the MPC655 (Laing D5). I have been running the pump now for about an hour and i seem to have all of the air out but the flow is actually worse than with the 355. Any ideas?

There is a rotor selector on the back with the numbers 1 to 5. Its currently set to 2 but moving it to the other numbers just results in the flow stopping all together.
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post #2 of 6
Thread Starter 
Oh and it has the EK top installed on this as well.
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post #3 of 6
don't know why your pump soesn't work on other 4 gears
post #4 of 6
The rotor selector you describe is to change the speed of the pump, from 1 to 5. It shouldnt stop the flow when increasing it, you could have a fault there.

The 655's actually have a lower head pressure thus 355's suit restrictive loops better. The advantage of a 655 is primarily the speed selection.

Are you sure the flow is stopping when you increase the rotor? It may just be that you can't see the water moving any more? Have you tried using a flow meter?
Edited by jNSK - 4/27/11 at 12:36am
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post #5 of 6
Thread Starter 
I can see the flow has stopped as I have a flow meter after the CPU block. The loop has one pump, a 240 and 360 rad, EK CPU block and 2 GTX 470 AquaGRFX blocks. Is it possible its just too restrictive?

Is it possible to put the D5 in series after the 355. I assume the pressure difference would cause this to be a bit of a mess but wanted to see if anyone is doing this.
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post #6 of 6
Now don´t go overboard here!
Here the link to my thread where it is all explained:http://www.overclock.net/water-cooli...-d5-top-2.html
Quote:
Originally Posted by charliehorse55 View Post
That's not how you calculate flow rate. You have to make an estimate of the pressure/flow curve for your components, and then place it onto the pump's power. Since this is very hard, it is best to just check whether you will get over or under a particular flow rate. I will use the flow rate of 1 GPM as it is generally seen as the flow rate where temperature gains begin to become minimal.

Step 1) Find out how powerful the pump is at that flow rate

I looked to Skinnee Lab's testing of the Laing D5 and found this graph for setting 3:



The Laing D5 with the EK X-Top has 2.25 PSI of head pressure at 1.0 GPM. Since you are using two pumps, double the number to 4.5 PSI.

Now, let's add up the total restriction of these components:

Your radiator pressure drop data was also done by Skinnee Labs.

So, we are at 0.38 PSI at 1.0 GPM of flow.

Now for the GPU block. While I don't have any exact data on the EK Waterblocks GTX 295 block, all other reviews of EK GPU blocks have had 0.8-1.0 PSI of drop at 1.0 GPM of flow. Let's take the higher end estimate to be safe. Add that to the total and we are up to 1.38 PSI total drop.

I also have no data for the CPU block, but based on some rough calculations based on a few reviews it should be around 1.6 PSI at 1.0 GPM

Total is now 2.98 PSI.

Add in the 1080 Radiator. I will simply assume it is 3x the restriction of the magicool 360 (as that's what the radiator seems to be, 3 360 radiators in serial) 1.14 PSI drop. Total is now 4.12 PSI. That leaves 0.38 PSI of headroom for fittings and tubing. I'd say with that setup you'd be getting just over 1 GPM.

Now, with the Kyros XT, which has roughly 2.5 PSI of drop at 1 GPM, that figure would be increased to 5.02 PSI. Thus you would be forced to turn the pumps up to setting 4.


Now that we have gotten all of that out of the way, I would suggest that you do NOT get dual MCP655s. With the cost of the dual top and the two pumps it would be a better idea to get a single MCP35X and use the PWM control on the motherboard to keep it nice and quiet.
Here an example for pressure drop measurment.

Here the D5 at setting 5:




And here the link to my thread where you can learn how to measure your pressure drop.
Just search for the sites that feature your water cooling components and look up their pressure drop.

GPU Blocks are less restrictive,CPU Blocks are mid range restrictive and NB & SB Blocks are the most restrictive.

GPU:0.5-0.7 PSI of pressure drop approximately measurable
CPU: 1.2 - 1.5 PSI of pressure drop approximately measurable
NB & SB: 3.0 > PSI pressure drop approximately measurable

That is just an approximation it is better if you measure your own loop according to the data I have provided you with.

Here the link to my thread
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