Choosing The Best Pump for Your WaterCooling System

1b. The there is no RD20RZLT. it is the MD20RLZ. That pump is an AC 120v pump which need an adapter to start up with your system. the MD30 on the other hand is DC and runs off of 24v which as mjgent mentioned you can get a 12to 24/15/12/20 volt converter that will allow you to use your 12v line on your PSU. Anyway, the MD20RLZ is not as powerful as the RD30 and is a bit larger.. the RD30 is a more ideal pump.
1C. if you scroll up and look at mjgents posts you will see the psu I am refering to. or atleast a link to it. jsut search for mgjents name in this thread and you will find it.

2. If you look at the fletcher munsen curve, you wil see that something at 40hz is 60 times harder to hear than something at 3khz. So a 3khz at 0db is equivalent to 40hz at 60db according to the human ear. So to anwer you question, the pump will be alot harder to hear than some fans.

3b. yes, doing 5/8" between the res/t-line and pum is optimum, and will be easier for you to install as well.

4. 76.8 watts drawing and it puts 45watts into the water. If you plan to get the RD30 I would advise that you run it at 20v with the PA120.3. This seems to be the sweet spot for everyday use. You can run it at 24v and turn the fans all the way up on the rad for a temporary performance boost.

1b. Sorry about confusing the names, I'm a bit tired. hehe... Still not sure about the difference between MD30 and RD30 though?

1c. It looks small, quiet and neat. Perfect but... check (#4).
http://img295.imageshack.us/my.php?image=img04005zt.jpg

2. Cool!

3b. Is there 5/8" Tygon (I understood Tegon was superior to Clearflex?) available? Or even clearflex?

4. 76.8 watts!! That's some 6.4 amps off the 12v rail, but then no PSU is 100% effecient, so let's say 8a or something (80% efficiency). That's a lot. My sig is actually very confusing atm, because I'm going to downgrade my PSU to a 600W Seasonic S12 (2x18a 12v rails on that one) because my 850 SSI is way too noisy. So if I'm going to be running SLI/Crossfire, some 6-8 HDDs, etc, do you still think I'll have the extra power in the Seasonic for the RD-30 (we are talking about the RD-30, right?)?

Sorry I typod. I meant RD30 when i put MD30 in bold. MD30 is another pum entirely and not really useful to our convo...

3. yes. go to mcmaster.com. they have ALL the tygon tubing. Just search for tygon R3603.

4. Ya its alot of power. If you run it at 20v it should consume about 50-55watts which is alot less. The 600watt seasonic shouldnt have a problem powering it.

Seee... it's not that easy. :p:

So, you are perfectly positive the seasonic will be able to handle my sig rig + the RD30? (Just need to double-check before making any stupid irreversible decisions!)

Btw, how big is it? I'm sure it'll fit the U2-UFO (otherwise you wouldn't have suggested it), but I'm still curious.

And quick question, how can something which draws some 76.8 Watts be quiet, when say an Eheim 1048 draws 10 Watts? A member of a Swedish OC forum calls this to attention, and questions whether the RD-30 really is all that quiet? Would you happen to have any factual and comparative numbers?

Thanks for all the terrific help and stickies Max, you've been most helpful to me and that's very kind of you. :toast:

Well I most certainly cant be 100% sure as I have no idea how realistic seasonics wattage ratings are, and what your system will suck up as far as wattage goes.

RD30 is pretty small. dont have to worry about the size. its about the size of a 25stack of CD turned on their side.

Iwakis are suprisingly quiet for how much wattage they draw. Iwaki says the dB is around 40, but I can tell you that Cathar, whos goes nutty about having a loud system uses one and has no issues with the noise. If I had a guess at what scale of dB iwaki was using, that it isnt the one that follows how humans hear. They probably also measured very close up, which makes a huge difference. But with all of that said, i dont think anything is as quiet as the 1048.. I have a friend whom's system i bulit with one and with the 1048 on a rag (for vibrations) you cant tell the pump is on, even with every other fan off in the case. pretty scary how quiet it is.


NP, I'm here to help.

I can tell you this much. When I boot up my system I have to feel the pump to make sure it's on. I can't hear it over the raptors and 3 Evercool 29db 120mm fans. One of the fans is on the rad in the room next door.

mj, if I only had 250 bucks you'd be one RD30 lighter.. lol.

This dude over at Iwaki Sweden just sent me this PDF, thought you might be interested.

I'm lost. Its just a sweedish reciept for some computer gear. What of it?

Hi boys
does any one tryed this pump

http://www.frozencpu.com/ex-pmp-40.html

and what is your opinion
looks powerfull 6 m Head

6m of head with 6.6gpm max. looks like a sweet pump. Ya ive seen it before. Not much info on it though.

its a shame it uses 1/4" fittings

The power rating is for 12 Volt use, at 24 Volt (the 6 m head setting) it consumes in excess of 45 Watts. The noise at that setting is clearly audible. Solid pump but i rather take 2 D5 in series for better performance with less noise.

actually, 2 D5s in series probably would be less performance, but very well could be less noise. I say less because D5 has ~3M of head, but putting pumps in series doesn't double it or anything, and the D5 dumps like 20 watts at 12v, meaning its consuming even more...
Maxxx, do fitting sizes bear any relevancy on the head pressure/flowrate of that pump? like if it was modded to 1/2" inlets/outlets...

Quote:

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Originally Posted by Bloody_Sorcerer

actually, 2 D5s in series probably would be less performance, but very well could be less noise. I say less because D5 has ~3M of head, but putting pumps in series doesn't double it or anything, and the D5 dumps like 20 watts at 12v, meaning its consuming even more...
Maxxx, do fitting sizes bear any relevancy on the head pressure/flowrate of that pump? like if it was modded to 1/2" inlets/outlets...

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Putting 2 identical pumps does indeed nearly double the head pressure (a few % are lost however), my 1 D5 vs 2 D5 in series 345 mbar vs 665 mbar or 93% increase. You probably meant doubling head pressure effect on flow rate, which is about 50 % increase in flow rate for doubling the head pressure. The D5s in measured consumed 21 Watts at high flow (a little less with restrictive loop connected), so how is 2x21 more than >45 ?

Um, looking closer at the pump (it was 5am and just coming home from a party when i looked at it yesterday), the pump is INDEED 12v and NOT 24v. I would venture a guess that putting 24 v into it would result in it blowing up within 5 minutes.

Bloody, I am not certain, but I remember talking with Bruce over at cooltech and he mentioned something to the akin that fitting size does effect head pressure, but logically i dont think it does. What can happen though, is that the shame of the impeller housing changes with different fittings, and this will indeed effect flow and head pressure.

LOL... sorry guys. I must have uploaded the wrong PDF document, what you saw was my latest order from Komplett.

Anyway, here's the right one (should have known, just by looking at the filename). Hope it didn't ruin anyone's day. :p:

hmm. not any new info, but a nice PDF that I have not seen before.

Quote:

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Originally Posted by MaxxxRacer

Um, looking closer at the pump (it was 5am and just coming home from a party when i looked at it yesterday), the pump is INDEED 12v and NOT 24v. I would venture a guess that putting 24 v into it would result in it blowing up within 5 minutes...

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Say what now? I had the predecessor to that pump (AP1500) for a while and it comes with dc-dc converter to run at 12-24 Volts, just like the new modell. The head pressure rating is indeed for the 24 Volt setting, while the power consumption is most likely for 12 Volt use.

and what about the noise -do you think is noisy and powerfull

***** heh... sorry bout that... totally forgot to put this on a different thread... just got caught up in my planning... but thanks for the help...*****

Hey there again. I've been looking over my case and i just don't have room to mount a multi fan radiator. Therefore i thought i'd try and mount a 2 or 3 fan radiator on the top. This would require me to cut through the metal case. Wondering if anyone has any experience doing this and if you could offer some pointers/advice. Thanks

Totaly the wrong thread for this Pr0pH3cy..

BUT, a dremel will do just fine. use a template. there are a few templates online depending on the radiator you choose.

a hole saw will also work pretty well, albeit the closest hole saw size is a little small.

Quote:

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Originally Posted by Pr0pH3cY

Hey there again. I've been looking over my case and i just don't have room to mount a multi fan radiator. Therefore i thought i'd try and mount a 2 or 3 fan radiator on the top. This would require me to cut through the metal case. Wondering if anyone has any experience doing this and if you could offer some pointers/advice. Thanks

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I just finished mounting a BIX 2 externally to my case. If you want to know what it ends up looking like, check my thread. Just ask any questions in this thread: http://www.xtremesystems.org/forums/...ad.php?t=85957

Im going to buy a new 12V pump to my watercooling now, and i wonder witch pump is the best? I must have an silent pump, because i hate noise...

So is it anyone who can help me? Im going to order from danger den store..

I have been looking on the danger den d5, is that a good pump?

D5 is an exceltn pump. Not totaly silent but very quiet.

Okei..So it's safe to buy one D5 to complete my system? I hate noise from a pump or mye fans on the radiator...