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Multi pump question

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#1
With my current rig (See Specs) I am planning on ditching my current waterblock for something else.
Considerations: The pump in the BigWater 760 is a P500, it is rated for around 500ml of fluid, I am pushing it close to 750ml with my dual 180mm radiator.


I am considering these:
Apogee Drive II
or
EK Supreme LTX

Would the Apogee Drive II aid or hurt my flow? Would it lengthen the life of my pumps?


In the loop:
CPU,
Nvidia 690
Photos that may help you visualize the loop

Thanks for reading,
 
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sneekypeet

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#2
In this instance I would just use a block.

The Apogee would work, but that loop is to restrictive in my opinion, and the pump on it would be wasted.
 
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#3
If I go with a normal block, do you think I should additionally buy a second pump or is that unnecessary?

Are there blocks better suited to my needs than the Supreme LTX that are in the same pricerange?
 

sneekypeet

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#4
The issue as I see it is that you could add a second pump, but it will offer you nothing more than redundancy (not lower temps across the loop, but possibly a degree or two on just the CPU). You could always slow the Apogee pump down to match the system, but to me its like trying to force a golf ball through a garden hose with that 760 kit.
 
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#5
You could always slow the Apogee pump down to match the system, but to me its like trying to force a golf ball through a garden hose with that 760 kit.
Do you think I would get better performance if I bought the Apogee and a 5.25in reservoir and did away with the 760?

I am having trouble making sense of the performance figures for the Apogee pump.
 

sneekypeet

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#6
Sure, I do think that would be the better call. Even losing the single 120mm rad from the 760 unit, I think the increase in flow would counteract the loss of surface area.

First chart is showing the pressure values of the pump and how it effects the flow. Second chart is just the PWM curve of the 35X, and the last chart is pressure equating to how far up the water can be pumped.
 
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#7
Sure, I do think that would be the better call. Even losing the single 120mm rad front he 760 unit, I think the increase in flow would counteract the loss of surface area.

First chart is showing the pressure values of the pump and how it effects the flow. Second chart is just the PWM curve of the 35X, and the last chart is pressure equating to how far up the water can be pumped.
I might give that a shot, I am not sure I like running the 3930 and 690 all in one rotation without giving the fluid space to cool, the last thing in the loop may get a little hot.
 

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#8
Could see if you can use the rad from it (760 kit) and slap it in the top of the case (where the exhaust fan is).
 
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#9
I guess I should have mentioned I stripped the Rad of its fans and it is now using two Silverstone FM121's for push pull (110 cfm when need be).

I am pretty confident I can reuse the rad if I remove the 760.

If I go about things that way, I should buy a new reservoir & the Apogee.

P.S. I had not really considered the pump was holding back my loop.

Edit:Or would it make more sense to mount the 120mm in its current position turned, 90 degrees?
With these
 
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sneekypeet

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#10
Any res is better than none, but the more water you can keep in a loop the better it should do.

Edit: In that case there is little flow in the bays, I figured using it in the exhaust would at least get that smaller rad into the airflow of the case. I know the fans create a bit of airflow at the bays, but how much of the air in those bays is fresh cooler air, and not just a swirling mass of warmed air?
 
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#11
Bigwater pumps have a high failure rate. I would ditch it asap. I had one go bad but was lucky. Noticed it before it was too late. Others were not so lucky.
 
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#12
You interpretation of how pumps work is flawed. Your P500 could pump 12398619238L of water, as long as you don't go over it's head limit.

Personally just start from scratch, or get yourself a Noctua D14, it'll improve on the 760.
 
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#13
You interpretation of how pumps work is flawed. Your P500 could pump 12398619238L of water, as long as you don't go over it's head limit.
I don't think it is flawed, I am talking about the amount of fluid in my loop, not the amount sitting in the reservoir.

Personally just start from scratch, or get yourself a Noctua D14, it'll improve on the 760.
I am very certain a D14 would fry my cpu. My voltage is well over any air cooler tdp.

Also note I am running a 3930k, not a 3630k, that was a typo.
 
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#14
How much water you have in your loop does not make a difference in performance. It's how much resistance/head there is.

A D14 out performs pretty much any 120mm rad based sealed/watercooling kit. Apologies, didn't realise you were using a custom kit.
A new pump won't really yield too much performance difference, you will have to measure your radiator water in and out temps, if there's a large difference then yes you would see a difference but say if it's less than 8C there really won't be.
 
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#15
So I went in a totally different direction.
You see, my 760 radiator is aluminum...
Because of this my small upgrade became big.

Below is what I bought/already own:

  • I will be mounting the Alphacool NexXxoS at 90 degrees in push/pull with the Silverstone FM121s. Airflow will be intake. This should take up just over 3 5.25mm bays.
    My hope is this will:
    1. Give my 3930k fresh air as opposed to recycled air as it is now.
    2. Give the Silverstone FM121's a much less obstructed airflow, which should lower noise, and temperatures.
  • I bought a new reservoir to sit under the NexXxoS . It will replace my current quad-harddrive bay.
  • I will remove the Bigwater 760 kit completely, no more aluminum with copper/nickel for me. Add the Apogee II block/motor.
  • Even though my current fluid is safe for mixed loops (EK-Ekoolant) I will soak my N690 block and Magicool Extreme Dual 180mm in vinegar.
  • In the future I will buy a fan controller to place in the open bay slot, for now it will be a normal bay cover.
  • Then I am going to put this beast back together. :toast:

How much water you have in your loop does not make a difference in performance. It's how much resistance/head there is.
We were talking about the possibility of the TT pump failing because of workload (which could come back to head limit as you mentioned), then sneeky started giving me general tips.
 
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