Dual (DDC) pump and reservoir combo

[fabafaba]

I want to add a second pump to my loop because my DDC struggles with it, I guess seven tight 90° bends and fittings and an even tighter 180° bend are a bit too restrictive.

The loop: 

Because I'm quite restricted with my available space, I'm looking for a way to put two DDCs in serial with a reservoir and within the footprint of a regular tube reservoir, under 220mm tall. I couldn't find any one-piece off the shelf solutions, and the only thing I could think off was stacking two Alphacool DDC pump tops with compact reservoirs.

If you know of any other solutions to simplify this, I'd love to know!

[MiniMike DK]

Could you put an additional pump in somewhere else in the loop, to help keep up the pressure, or does the pumps have to right next to each other?

[fabafaba]

1 hour ago, MiniMike DK said:

Could you put an additional pump in somewhere else in the loop, to help keep up the pressure, or does the pumps have to right next to each other?

I'd love to put the second pump somewhere else, because then I'd only have to buy one new pump top. There is however no space I could think of without it dangling somewhere in the air. Take a look yourself, the link is in the first post. My current pump-res combo sits in a roughly 100x100x220mm space and I would prefer a dual pump top mounted vertically, but I couldn't find any that have an reservoir, apart from 5 1/4" bay units, but those are too large.

[For Science!]

4 minutes ago, fabafaba said:

 

1 CPU block and 1 GPU block and a couple of big rads right? Presumably the flowrate is the issue and there is no problem with head pressure. Why not consider upgrading to a D5 instead?

[fabafaba]

1 minute ago, For Science! said:

1 CPU block and 1 GPU block and a couple of big rads right? Presumably the flowrate is the issue and there is no problem with head pressure. Why not consider upgrading to a D5 instead?

Yes, two blocks, three rads and a lot of 90s. I want a higher flowrate, but I think the problem is my loop being too restrictive, resluting in my low flowrate. I can roughly calculate it with the temperature delta before and after the blocks and the added power draw of the CPU and GPU, and it's somewhere between 20 and 25l/h. My Alphacool DDC310 can supposedly do 200l/h without any resistance, and only getting a little over 10% of that looks like a problem that can be solved with more pressure. Two DDCs have 4.4m of headpressure, which is about the same as a good D5. A new D5 pump res combo would cost quite a bit more than what I came up with, so I'm not quite sure about that.

[For Science!]

1 minute ago, fabafaba said:

 

I would personally go for the cleaner look of one pump, not to mention the reduction in noise from going to a D5 let alone compared to two DDCs in close proximity to each other. Up to you, but this may be a case scenario of "buy cheap, buy twice".

[MiniMike DK]

On 6/17/2019 at 8:37 PM, MiniMike DK said:

Could you put an additional pump in somewhere else in the loop, to help keep up the pressure, or does the pumps have to right next to each other?

How about this one??

 

https://www.ekwb.com/shop/ek-xtop-revo-dual-d5-pwm-serial-incl-pump

[Touch My Hamm]

I remember old watercooling builds that had dual pumps. Its been a while since people dont use 4 gpu's plus ram/HDD watercooling anymore. Koolance still has some but not sure how readily available they are. https://koolance.com/rp-452x2-dual-5-25in-reservoir-for-1-2-pmp-450-s-pumps.