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Two Pumps in Series: X20 750 + Laing D5 vario Possible or not?

Last response: in Overclocking
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July 18, 2013 4:39:08 AM

Basically I have been reading around lotsa threads on this one but none really reached a conclusion on this topic, so I would like to get a clear cut answer.

My current loop suggestion is this:
X20 Pump/Res Combo -> Res -> D5 vario -> 140mm Rad -> Gpu block -> 120mm Rad ->360mm Rad -> CPU block -> X20 Pump/Res Combo -> e.t.c

(I already have the listen parts above, so in worst case scenario I just ditch the X20 Pump/Res Combo, and my D5 might just manage the 3 Rads, CPU and GPU.)

I basically want opinions on my suggested loop, whether it will work, whether it will damage the X20 pump. I've heard that if I leave the D5 vario at a speed of 3, then it will not damage the X20 pump, but then will I have any benefit of having the pumps connected in series? (I would assume so, since two pumps in series of the same flow should result in a loop of double the flow rate, no?)

Anyways, I'll leave it to you guys^^ Thanks for all the help in advance :) 

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a c 103 K Overclocking
July 18, 2013 5:19:55 AM

Oh sure possible - now - let's re ask the proper question - Is it a good idea? NO lol they are very different level of power for pumps. The D5 will work far harder than the z20, and with the pressure difference, you will create a "pull" on the x20 that will shorten it's already dismal lifespan, as well as limit the flow to the D5, making it work harder for a lower efficiency. Even at 3, the D5 and x20 have different head pressure and flow profiles. They cannot be matched. check the test data on them and look at their curves

If you really want to go this route, need to break open the wallet and do it right. New res, 2 D5 pumps
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July 18, 2013 6:12:04 AM

I've already got these Radiators:

XSPC AX360
Alphacool NexXxoS UT60 140mm
Alphacool NexXxoS ST30 120mm

(Can't return the 360, and don't want to return 140/120)

Will the D5 be able to handle the 3 RADs + the GPU + the CPU on its own?

(I.E. I basically just ditch the pump/res combo)

I can then later buy another D5 pump/res if needed (I might SLI/Crossfire in the future, so at that point probably) and put it where the current pump res is...
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a c 176 K Overclocking
July 18, 2013 6:46:55 AM

Radiators are very low in restriction, especially the thicker ones like you have posted.

A single D5 should be fine for that.
It would also be fine for SLI/Crossfire if you parallel the cards.
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July 18, 2013 7:03:26 AM

Thanks manofchalk^^ I'll just unplug the x20 pump res then. I guess the problem is solved :D  Thanks guys, I'll have to give the solution to Buzz though, since he technically has answered the question.
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a c 103 K Overclocking
July 18, 2013 8:07:34 AM

You need to replace the res. The outlet goes thru the pump. So unplugging really does no good and still creates restriction
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a c 176 K Overclocking
July 18, 2013 8:17:21 AM

The X20 750 V4 does have two ports on it that don't go through the pump. If you have that version you could use it as a reservoir.
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July 18, 2013 8:45:56 AM

I meant I literally am not going to use the x20 750 (and I think i have an old version), I'll be using a different res (Z multi 250) to feed the D5 at the bottom of my case.
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July 18, 2013 9:13:14 AM

Just a quick question, you guys have any ideas about my overclocking potential with the CPU? What sort of temps should I be seeing with an i7 3770k CPU under load (without oc) with this sort of loop?

(ATM without the D5 and the two smaller Rads, I get around the high 60s when the cpu is under load.)
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a c 176 K Overclocking
July 18, 2013 9:17:48 AM

My (not very) overclocked 3570k gets around that hot under load when the ambient temperature is about 30°C. If your ambient is something like 20°C and the GPU isnt putting out much heat, I would expect it in the high 50's.
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July 18, 2013 9:54:34 AM

I'd say my ambient is around 30C, I'd assume my GPU puts out quite a bit of heat, since its a 7970 and TDP of 250W. So its sounds alright ^^ Im just annoyed right now that I gotta ditch the front bay res, makes the aesthetics of my build far worse ;'(. Trying to find a better way of making the loop^^ We'll see what happens :D , I'll stop bugging you guys now, you answered my question ages ago XD
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a c 176 K Overclocking
July 18, 2013 10:03:42 AM

At idle AMD cards actually consume very little power.
Check my build log, it seems that we will have fairly similar loops. Stuff about my 7970 going under water (including temp results) are on the 2nd page.
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July 18, 2013 12:08:53 PM

Looks cool, I think I know how to plan my loop now, I could go into it in detail but I don't think its necessary^^ XD
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