When do you need to move to two D5 pumps? - Overclock.net - An Overclocking Community

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When do you need to move to two D5 pumps?

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post #1 of 17 (permalink) Old 03-01-2019, 04:44 AM - Thread Starter
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When do you need to move to two D5 pumps?

My current plan

1x 560 Hardware Labs Black Ice SR2 560MP
2x 420 Hardware Labs Black Ice SR2 420MP
1x CPU Watercool Heatkiller IV Pro Intel Black Copper
2x GPU Watercool Heatkiller IV RTX 2080 Ti acrylic Ni-Bl RGB
1x RES Aqua Computer Aqualis XT
1-2 PUMP Aqua Computer D5 Next

All with hard tubing (brass) so quite a few 90 degree angels I imagine.

Would a single Aqua Computer D5 Next be able to handle this or should I look at a dual serial D5 setup?

TLDR When is it too much for a single D5?

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post #2 of 17 (permalink) Old 03-01-2019, 05:28 AM
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I would say "you're there".

Not that a single pump won't still work, it will, but you'll get almost double the head pressure with two and the security knowing that if one of the pumps fail, the second will still pump. I believe a single pump in the loop you described, depending on how many bends, would struggle in the long run. My two D5s, I purchase more than 10 years ago and they're still running great. My theory is because I always use them together, in serial. I could be completely wrong, I'm no expert, but I had a single D5 in another complicated loop and it failed after about 4 years. I believe the restriction of the loop caused that pump to work harder than if it had a second pump working along side it, hence the failure. I'm only sample size of one, but still, it was enough to convince me of two pumps in complicated loops.

I run two Koolance 480's, two RES and one GPU block and CPU block and always use two D5s in serial. I would say, IMHO, that when more than one Rad and waterblock is involved, two pumps is almost a necessity.

It looks like you'll have 3 RADs and 3 blocks. Again, IMHO, I would never run that loop without two pumps. Not saying it wouldn't work, but I'd sleep better at night knowing if one pump failed, I'd still be good to go.

Boy do I miss Martin's Liquid Lab......check this out for more info. It's old, but most of it still applies.
https://martinsliquidlab.wordpress.c...s-vs-parallel/

If you do go dual pump, GO SERIAL! Don't do a parallel loop.

Last edited by LancerVI; 03-01-2019 at 06:09 AM.
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post #3 of 17 (permalink) Old 03-01-2019, 07:15 AM
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Every time I see people quoting Martin's LL I remember how crucial he was to this hobby and how much we lost when he stopped testing.

That said I would agree that a second D5 would be a good idea. You will be able to get same or better flow rate with less noise and the reliability that 2 pumps provide

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post #4 of 17 (permalink) Old 03-01-2019, 07:34 AM
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The SR2 radiators are very high flow. And if you setup the GPU blocks in parallel, the pressure drop will be 50% of a SINGLE block. (25% of 2 blocks in series).

For reference: I'm running 2x 360GTS, CPU and GPU block, 9x 90° adapters and a single D5. 3x SR2's are have the same restriction as 1 GTS360 and a GPU block has the same restriction as a single 360 GTS. And 140mm rad with is also less restrictive than 120mm rad with because you have 1 or 2 extra channels.

So your loop would have about the same restriction as mine with the GPU's in serial and even less with the GPU's in parallel. I'm getting 1GPM with a D5 at full speed, so you should be fine with a single D5. And when I drop my pump speed too 3000rpm, my temps raise only 1°C.

If you had 3x GTS rads, then it would be a different story and I'd dual D5's is a must.

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Last edited by broodro0ster; 03-01-2019 at 07:43 AM.
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post #5 of 17 (permalink) Old 03-01-2019, 07:41 AM
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Hi,
I'd personally if I had a case to do it I'd just use two loops
One for cpu and one for gpu.
Put two rads on the hottest item which you don't mention which cpu you'd be using
But two 2080ti's I'd suspect to be the two hottest items pushed hard

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post #6 of 17 (permalink) Old 03-01-2019, 07:43 AM - Thread Starter
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Figured as much but good to confirm my suspicion.

So what now,

The XTOP is incompatible
https://www.ekwb.com/shop/ek-xtop-re...-d5-pwm-serial

The XSPC works I hear but it goes in a bay and the case I want does not have any bays
http://www.xs-pc.com/reservoirs/twin...-bay-reservoir

What serial tops are there for the Aqua Computer D5 Next?

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post #7 of 17 (permalink) Old 03-01-2019, 07:50 AM - Thread Starter
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Quote: Originally Posted by ThrashZone View Post
Hi,
I'd personally if I had a case to do it I'd just use two loops
One for cpu and one for gpu.
Put two rads on the hottest item which you don't mention which cpu you'd be using
But two 2080ti's I'd suspect to be the two hottest items pushed hard
I guess a dual loop should bee considered.

I'm just so attached to making a single loop . Don't even know why, more elegant?

plans are
2x 2080 ti, 380W bios
9900K 5GHz+ if lucky.

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post #8 of 17 (permalink) Old 03-01-2019, 07:56 AM
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Quote: Originally Posted by MADworld View Post
I guess a dual loop should bee considered.

I'm just so attached to making a single loop . Don't even know why, more elegant?

plans are
2x 2080 ti, 380W bios
9900K 5GHz+ if lucky.
Single loop is perfect. The CPU barely produces heat during gaming. My 8700k was cooled by a single GTS360 for a while and the delta T was only 2-4°C depending on the water. With a 1080TI in the loop and an extra 360GTS it's 10°C. This means that my CPU is running a little hotter, but my GPU is benefitting from extra cooling.
I would go dual loop, my GPU would run hotter and my CPU a little cooler.

Just choose whatever you want. Both options have their pro's and cons so choose the one you like the most. Single loop is easier to build and maintain btw.

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post #9 of 17 (permalink) Old 03-01-2019, 08:05 AM
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Hi,
Draw it out your case will pretty much sum whether dual loop can be done nicely.

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post #10 of 17 (permalink) Old 03-01-2019, 10:02 AM
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Quote: Originally Posted by MADworld View Post
I guess a dual loop should bee considered.

I'm just so attached to making a single loop . Don't even know why, more elegant?

plans are
2x 2080 ti, 380W bios
9900K 5GHz+ if lucky.

I would be considering two pumps at the least. also if you like the single loop idea, but would like to try something a little different. I parallel all of my water loops today.


my test build
https://www.overclock.net/forum/61-w...el-9-6lpm.html
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https://www.overclock.net/forum/61-w...ooled-rig.html
my extreme build
https://www.overclock.net/forum/62-p...c-cooling.html
as you can see I have been doing this for some time.

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Last edited by toolmaker03; 03-01-2019 at 11:17 AM.
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