Why have d5 pumps got so popular?

[m_jones_]

I remember DDC pumps being a lot more popular a few years a go compared to D5 now appears most people have moved on to them.

Is there any reason for this trend?
My DDC 18w died so need to replace it and not sure if I want another one.

Thanks.

[Kvickstick]

In my experience the D5 is much more reliable. Had a total of 5 DDC pumps, they all died.

[Gimmpy224]

been using my Iwaki for 8 years almost.

[gmat]

Two words: reliable, and silent.

[gatecrasherlok]

I have to agree with this. Love the silence and has worked a great charm ever since plus they are very cool running.

[m_jones_]

Thanks for the information, going with a D5 vario + EK d5 CSQ white acetal.

[lowfat]

DDCs are only less reliable when misused. I'd much rather have an MCP35x over a D5 vario.

[musicfan]

Swiftech makes an MCP 655 D5 type with PWM instead of manual control if you wish PWM with a D5 body. Looks like you have already chosen a top that would work fine on the body in the link. Good luck.

[Sparky]

I've had 1 DDC fail on me a few months in and 1 D5 fail on me out of the box, while I had another D5 run flawlessly and my current DDC has been going for years.

Given my experience with both pumps being 50/50 I'm sticking with the DDC for now as it is smaller and the inlet/outlet orientation is better for my setup.

[m_jones_]

Swiftech makes an MCP 655 D5 type with PWM instead of manual control if you wish PWM with a D5 body. Looks like you have already chosen a top that would work fine on the body in the link. Good luck.

Sadly Swiftech products are a pain to get hold of in the UK and rather expensive or I would have opted for it.
I will sadly miss how small and flexible the DDC pump is.

[CrazyNutz]

D5 = Reliable, Quiet & cool Running

DDC = Less Reliable, More Noise, Hot

Just my experiences. BTW I have a D5 that has ran for over 6 years 24/7. She's still running like a champ

[subzero 1979]

i have 2 dcc both died,my two d5 works fine

[paulbagz]

Hmmmm *stares at brand new unused MCP35X*

You guys are filling me with confidence!

-PB

[lowfat]

Hmmmm *stares at brand new unused MCP35X*

You guys are filling me with confidence!

-PB

It is the best non-Iwaki pump out there. Just don't be an idiot and run it full speed w/ a single low restriction block.

[bmaverick]

As a few mentioned, the DDC-3 (MCP355) series runs hot. Adding a performance top just adds to the heat problems. Thus, the DDC-3 series in time burns up. 18W to 22W can be hot while under constant load and running in a case that as low ventilation for the pump. Koolance and others have heat-sinks for the DDC series pumps that offers good success. Or, just place a basic CPU/GPU cooling fan to blow on the bottom.

Now, the DDC-1T series pumps run at 10W and remains cool. It's in the same package as the DDC-3 series. This will live up to the 50K+ run life without much trouble on it's own.

The D5 is large enough to be it's own heat-sink and has speed control. Silence for this pump is due to it's low pressure head and high flow. It's ideal for loops with lite to no restrictions. The DDC shines in restrictive loops.

All of this info can be gained at Martin's Lab blog.

If you are building a WCing loop in an ITX form factor, the D5 isn't the choice due to size. A DDC is the sweet spot for compactness. And for heat in a small form factor, the DDC-1T works even better.

[kolombo]

As a few mentioned, the DDC-3 (MCP355) series runs hot. Adding a performance top just adds to the heat problems. Thus, the DDC-3 series in time burns up. 18W to 22W can be hot while under constant load and running in a case that as low ventilation for the pump. Koolance and others have heat-sinks for the DDC series pumps that offers good success. Or, just place a basic CPU/GPU cooling fan to blow on the bottom.

Adding some xtra hardware to achieve no failure improvement , is like building tower of cards in open window room.
Remember Murphy`s law ..New systems generate new problems...., funny isn`t it?

[Sadasius]

D5's just keep running.

[m_jones_]

Really happy with the d5 pump, much quieter than I could get my DDC 18w with EK top. Now i just need to tear my loop apart as I think it's clogged up.

[Movieman]

To me the D5 is a PUMP and the 3 series is as toy..The old saying of you get what you pay for is so true here.

[NKrader]

Two words: reliable, and silent.

thats why i used ddc

[jim0ne]

I actually have a D5 pump for about 6 years now and been in 3 different system and it is still running strong 24 hours a day.

[grasskicker509]

Because cases have become gigantic...and more consideration for watercooling from case makers...most people would not try to squeeze in a d5 in a midtower

[Furball Zen]

I have no issues with my used DDC i got in 09 and its going in another build.

[Stewie007]

Its not much different than sizing cables.... You've got a temp rating on the jacket and that gives you a maximum current draw before you start the bloody thing on fire.

Its all about heat dissipation. A Metal bodied pump will always last longer than a plastic bodied pump if you're going to use them on high loads. Plastic is an insulator, while metal is a conductor. Makes the HEX process a lot easier.

Not to mention that a 115v Iwaki is drawing .25 amps which isn't all that difficult for a metal housing to dissipate.

Pump heat isn't due to some magic of engineering that makes a specific brand of pump better. Its about how much current it draws and its ability to dissipate heat; whether by direct cooling or air cooling.

A plastic pump will NEVER be as reliable at high loads. They have to be used appropriately. You wouldn't put a 40HP pump on a 1000Ton chiller. That is what you're doing when you use a pump that is too weak for the job. It will always draw near its MCA. That is bad.

[rge]

I have 4 DDC, 2mcp355 and 2mcp350. All are 8 years old, all still function, my 2 mcp355 were running for all 8 years, until recently. But I always had mine on a stand with air flow blowing underneath them, so mine always ran cool. I even used XSPC tops for several years on a low restriction loop...but again, mine were cooled via fan, then later with heatsinks.

A ddc will typically pump ~ 0.2 gpm higher in a typical restriction loop than a D5 pump on setting 5, but ddc is a little noisier with higher pitched whine.

At 1000 rpm fan speed (radiator fans), I cant hear either my ddc 3.2's. At 700 rpm fan speed, the ddc3.2s are audible even though inside case, on a stand with heatsinks, and then stand decoupled with velcro to petra gel.

I switched to 2 D5 vario on setting 4, lost 0.3gpm (2mcp355 vs 2 d5's), but now with rad fan speed 700 rpm, and pumps on stand/petra gel/velcro, cant hear D5 on setting 4 above 700 rpm rad fans.

To me, if I were running rad fans at 1000 rpms or higher, I would prefer my ddc's and take the extra 0.3gpm, it is just slight increased noise via higher pitch DDC along with little higher flow...but that was my power phase, now I am in my it cant be quiet enough phase. Reliability is similar if using fans or heatsinks to cool ddc. If not cooling ddc, then agree D5 would be more reliable. For every 15C increase in temps, you halve the mean time to failure of electronics...D5 will last longer unless cool ddc, as ddc is more than 15C higher constant temp if not using heatsink/air flow. And if running an aftermarket high flow top with ddc in low restriction cpu only loop, martin has showed temps ddc (no fan/heatsink) may run 90C + range, or higher if putting directly on gel.... so if D5 runs 30C cooler, then expect 2 half lives difference if using ddc foolishly...D5 is more new user friendly.