You must be very careful, D5 survived serious changes. It's not clear what they change exactly but they influence on performance of original Laing D5 made in Germany before 10-12 years... Not only PWM control and small parts inside.
Some brands as EKWB D5 G2 and XSPC model with SATA Power connector add some small parts on impeller probably to increase performance. But that part cause vibration and more noise. No other solution than drilling D5 channel because impeller in that case need more space during spinning. 
 
Guy nicely explain here...
 

 
Because of that I would stay with oldest batch I could find with speed controller.
Not only that, my motherboard example every time during restart computer cause D5 to run on full speed 2-3 seconds.
It's set in BIOS but never mind, motherboard work on that way and it's not only one. Pumps with Speed Control can't force to spin faster if you regulate speed. And I only could imagine suffering of PWM owners with motherboards where controlling fan is harder. On mine is easy, many options, settings. But it's not on every motherboard like that.
My pump is set 50% to 55C, than increase speed and on 75C is full speed.
I didn't set earlier because that's more warning setting, anyway difference between speed 3 (3300RPM) and Speed 5 (4800 RPM) is not big temp difference. That only should warn me that something is wrong if pump start full speed.
On other side D5 w Speed Control is better to have coolant sensor.
 
Swiftech MCP655 become most famous because they first use D5 and in that period before 15 years that was made in Germany.
After 2009-2010 production is removed and MCP655 on stock probably had 1-2 years more MCP655 w Speed Controller. 
 
 

 
Look cool, no doubt, but how durable is should be waited little more maybe.
They will become famous and wanted if customers are satisfied.
Haa... I don't know why people continue to keep brown rubbers on Noctua NF-A12x25 PWM on side where not need when fan look much better with rubbers only on side turned to radiator? Without them look much better. 

You are right, but it's sad how people defeat fact that all D5 are same.
They not... PC stores sell them for 70-80$, other stores sell D5 38/810N (1/2" barbe)with Laing label for 250-300$.
Actually all are same 790/810/850N only barbe size is different.
I don't know why, but that's it. 
 
Can you tell me distance between screws on D5 Next mounting mechanism.
For me mounting options play big role because I don't want to drill case and than I need to choose between 120mm fan options or my case have some stand for pumps.
EK Revo fit, DDC off course fit, but I'm not sure what else.
 
If I put 240mm radiator on floor I could use that part.
EK Lowara D5 with speed control is probably better choice if someone order now.
I will follow experience of customers for D5 Next but I don't like top. I would rather to use pump only and control. 
They not sell probably alone.
 
I'm hooked on watercooling. 
Only I'm not sure how to replace monitor from 2011. 
I don't see option how to find space for saving money for monitor... very bad.
That's weakest part of my PC.
 
 
 
 
 
 
 
 
 
 
 

Vlada011
Ohhh they sell alone. Top is separate. NICE.
Heatkiller top inside Tube or separate is better.
 
https://www.caseking.de/en/aqua-computer-d5-next-pumpe-wapu-158.html
 
You can check size on mounting mechanism on your D5 Next.
Maybe he fit on four holes marked with yellow. Red is D5 Revo, Blue is DDC classic I believe.

I am confused at what your saying, sorry.  I already have a mounting bracket setup for mine, its made by Coldzero.eu, it will mount the top on top of the HDD tray.  As for the hole spacing I think you mean the EVO top?  Its 40x40mm mounting hole distance which are M4 threaded, hope this helps.  There are 8x sets of these mounting holes and the unit is able to be mounted from the back set of 4x which I measured below, and also the bottom 4x which I will be using to mount this unit.  As for fan mounts, the unit comes with a 120mm fan mounting bracket.

Here is a cool update!  the Watercool.de HK res fits perfectly on top of the ICEman EVO dual D5.  I took a shot in the dark and measured the G1/4 hole distance on the ICEman which comes to 27mm, and the HK res is reported at being 26-28mm for the G1/4 hole distance, turns out they are the same distance, so I was able to attach it to the IN and OUT of the ICEman EVO via 2x Bitspower D-Plugs 20mm.  I ordered some black BP D-Plugs which I think will fit the look better.
 
 

More on the way!  Cuplex Kryos NEXT with VISION sleeved up.

Vlada011
This look amazing.
Like some strange cooling device.
Perfect. Please don't destroy everything with much RGB inside.
 
How you figure out that they fit together... Great?
I can't remember when I saw such combination for dual D5 Pumps.
You changed a lot of combination. But I think you should stay on this one.

I did have to offset the res, since with the HK res connected to the top IN and OUT I would of lost pump performance according to Jaffe over at ICEman.  Now the res is only attached via the IN on top, the pumps will cycle the coolant through the front IN and OUT with 2x 90 degree rotaries.  Have a temp sensor in the side of the res and on the back of the pump top.  I have changed a lot of combinations, but I like testing hardware and seeing how the cooling/flow performance of parts.

Got my second Hubby 7 installed, so now I have total of 14 internal USB ports for my Aquacomputer Eco system.  I will connect the Cuplex Kryos Next along with the 2x D5 Next to this unit.  I mounted it directly too my motherboard, using some long M4 screws and plastic standoffs.  Another upgrade in the works is the Silverstone SDP11 paired with 4x WD Blue SATA M.2's and 4x BP Advance Armor Black Heatsinks.  I will remove the 3.5" tray and have the PCB mounted to a small custom mounting bracket to reduce its overall height.
 

Got a Gigabyte GC-AQC107 card in and replaced the stock TIM with NT H2 and added a 2pin temp sensor next to the Aquantia Controller and used 2x 1mm Grizzle Minus 8 pads (used 2x Arctic 6w/mk 1.5mm pads) with the sensor sandwiched in between, to give a rough temp reading of the card.

Ended up switching to the Phanteks Luxe 2 case, and went back to the Alphacool Eisdecken dual D5 top, paired with 2x D5 NEXT, I will have a new post on it soon.  Sorry for the long delay.

GTXJackBauer
Very cool build and a lot of Aquacomputer's goodness going on.  Well done.  

Thank you, I had to downsize a lot of the aquacomputer gear for the Luxe 2 as there simply was not enough room for it all.

Very nice work !
Pump tops for D5's have come suuuuch a long way since I last used them :O

Hi
Sorry off topic, but i need help about double pump D5 Icemancooler.
This 5 hole where the temperature sensor is, can a drain valve be installed?" />
 
Thanks for the good work you do.
Regards
 
 

Krzysztof47

eullin
Hi
Sorry off topic, but i need help about double pump D5 Icemancooler.
This 5 hole where the temperature sensor is, can a drain valve be installed?" />
 
Thanks for the good work you do.
Regards
 
 

No worries, pretty sure it could be used as a drain port.  Might need to raise the mounting bracket up with standoffs as that is where it gets mounted.  Hope this helps!

Hi 
This is the idea of how to install the double pump D5 under the tank.
Does it seem correct to you?
 
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Regards