Pumps in serial: DDC vs D5

almighty15

almighty15

almighty15

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Got 2x 18w DDC's and 2x D5's and thinking of doubling them up as my loop is very restrictive.

I want over 1 Gallon per minute on my flow rate, a single DDC manages 0.9 Gallons per minute and a single D5 on full power only managers 0.6!!

Now as I have a pair of each pumps I'm trying to decide which 2 I should run in serial to get my flow rates up.

The DDC's have more pumping power but the D5's have a higher flow rate.

I can get the pump top for the DDC's for £30 so while the top is cheap the pumps are nosier then the D5's.

On the flip side the top for the D5's will be more expensive but they'll be quieter.

What would you guys go for?
 
DataVampire said:
Can I ask why your loop is so restrictive ?. im only asking as mine is pretty restrictive and I get around 1.39 ltr ph
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That's not enough! You need more power too!

vsg28 said:
^ Assuming you meant 139 LPH, that's just 0.6 GPM.

OP: Go with dual DDC and tone them both down. At max, you will be quite higher than 1 GPM anyway. Swiftech tops seem to be the best performing ones but given the part where you can barely buy them in the UK, just go with whatever you like.
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How am I to tone them down? They're not the PWM version?
 
ubersonic said:
I would say the D5's, but then I own a pair so biased :D

Generally speaking when doubling up on pumps you do D5 in series or DDC in parallel, this is because the D5 has great flow as standard and running them in series beefs up the head, whereas the DDC have great head as standard and running them in parallel beefs up the flow rate. You can OFC get tops that do either.
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Parallel is rubbish and causes an 80%+ drop in pressure if a pump fails.

Check out martinsliquidlab for his review on the matter.
 
DataVampire said:
If my flow is far to low, will it effect my temps ? if so is it drasticly effected ?
As it happens I have a spare d5 vario in a box somewhere. where would I put that ?

Output of the d5/res combo>input of the other d5 ect ect.

Now you got me worried now lol.

I have x1 hardware labs 480 rad , x1 360 hardware labs 360 rad. only cooling motherboard block(built in) and cpu(new EK evo block)
Should I be concerned ?

Reason why im asking I am running my d5 at full pelt atm.

Apologies for high jacking your thread
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I run all HWLabs radiators and while they're good rads, they're the most restrictive on the market by a long way!

You ideally need ATLEAST 1Gpm flow rate in your loop, it can affect temps if it's low.
 
P4Clock said:
no 1t the base model, you can mad a 1t to use a fan plug then put it into a fan header on the mother board and your golden.

mine as a PWM board you will ever have a pwm board or a 18w board you should look into it.

but onto been quiet, mine made one hell of a lot of noise when i got it, but putting it on a pad fixed it.
try putting yours on a something soft, ever at 100% it a lot better.
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I'm sorry but what you said is confusing, can you tyoe it again?

vsg28 said:
So what cables are on the pump? Just a full size Molex?
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Mine are the fan headers, came stock like that.
 
P4Clock said:
What i was saying is you can modify a base level pump into a better pump, most of the pumps are 18w.
Open your pump up and have a look at the PCB. ever DDC made is ever an 18watt or PWM. just because your is only as standard input dont mean its a standard pump.
My pump came from OcUK as a DDC 10w 1t(Bottom level pump) but the PCB is a 3.1 PWM, so i removed all the standard plugs and fitted an PWM cable:)

second problem is the noise....
i have the normal pump running at 90% speed 3000rpm and it is silent, you need to put your pump on a pad of some sort, i have mine sitting on a sponge for a few weeks till i got something better for the job but it made no noise.
if you have low flow put the pump on 100%, and pad it.
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But how are you running them at 90%??

Mine are already the 18w versions.
 
String said:
Makes sense now!

I'm really just wondering why the OP needs the 2 pumps for a target flow rate... surely acceptable temperatures are the target? If they can't be achieved, then investigate why by all means, but the OP has not mentioned poor temperatures?

As I say, I'm just interested in the thought process.
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It's widely regarded that you need above 1Gpm for optimal performance, not to mention it makes bleeding and getting air of the loop a heck of a lot easier.

I have a very restrictive loop and it's took no where near the amount of fluid that it should be taking, the pumps are just to damn slow to push the air out.

Moving the case doesn't help either.
 
DataVampire said:
Great.
Any idea of flow rate ?
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Not yet as not plugged the Aquaero back in but easily over 1GPM.

The pull is so much the reservoir is actually struggling to keep them fed with fluid!

The loop has taken a full bottle of fluid now though where as before it only took just over half so the extra power has helped to push the air out the system.
 
Just plugged the Aquaero in real quick and low rate is now 1.1GPM

That's up from the 0.8GPM I had before, so that's a 30% increase, that's with a single 18w and a single 10ww DDC though as my other 18ww DDC died. If they were both 18w DDC's flow rate would be even higher. :(

Might move to PWM pumps.

One problem that I now have is the reservoir is struggling to feed the pumps resulting in the pumps constantly sucking in air which is affect flow rate :(

So need to order a bigger reservoir.
 
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