Choosing The Best Pump for Your WaterCooling System

I'm using the MD-20RZG-2 in one of my computers, with a Storm, hence the choice of pump, not to mention, 2 EK FCX1900 Water blocks on 2-X1900XTX video cards, and, a Maze 5 chipset cooler. And, I'm getting a terrific flow rate. I've measure pressure, but, as It's in a closed loop, it makes little difference. Wish I could measure flow rate, but, don't have any "Accurate" Flow meters in my price range. I'm also using the regular MD-20RLT in another computer, and, It also, works great. Using a RBX775, and, again 2 EK FCX1900 blocks, and a Maze 5. They both work great, the cases get so that you can't keep your hand on them for more that about 15 sec. or, it's gonna hurt. But, I put a low rpm Yate loon 120mm fan blowing over both of them, down the lengh of the pump, and it helps a good bit, to carry some of the heat away, and out the case. With the Fans blowing, you can rest your hand on the pump case, for as long as you like, without drawing back a lobster claw. :-)

there's someone on ebay selling an md-20rzg-2 right now. 22.49 now plus shipping.

it's not me that's selling it, but i'm selling mine too and i want to get the demand up (so the price will follow ;)).
just a heads up.

Brian,

I had a similar issue when I forgot to turn on my Iwaki MD-20 (its ac powered and I didnt have a relay). I had it off and my cpu temp alarm when off (70C) so i jumped under my desk and turned on the pump..

2 seconds later there was water spraying everywhere because the tubing had overheated and got loose around the cpu block... Thankfully i was still under the table so I was able to pull the main power to the computer before any dammage had occured.

^^ Well, it was a total letdown. I was happy that it was on my test rig first. I was just trying to see how big of a difference it would make compared to the original cooler. Truthfully, I was not that impressed in the drop. Perhaps the pump was truly screwed from the get go and Green Rain was going spray whatever computer it was put into. I know that Water is the best and more stable... But seriously, Passive is truly working for me. Does anyone else here run passive. Have you found it's upper limit?

Well being a thermaltake kit I'm not surprised it was a letdown. Using real parts would give you much better results.

Quote:

---

Originally Posted by SparkyJJO

Well being a thermaltake kit I'm not surprised it was a letdown. Using real parts would give you much better results.

---

Perhaps in a year.. I'll try again..

please help me to choose one of these pumps: Laing D5 or Laing DDC Ultra. i heard D5 is more reliable and quieter, but noise isn't that i'm warning about. i'm going to order D-TeK FuZion, Thermochill PA120.3 and fittings/tubings (gpu & chipset w/blocks will be ordered later). i need it to have enough power to cool well. so, what is better?

Quote:

---

Originally Posted by L'enFer

please help me to choose one of these pumps: Laing D5 or Laing DDC Ultra. i heard D5 is more reliable and quieter, but noise isn't that i'm warning about. i'm going to order D-TeK FuZion, Thermochill PA120.3 and fittings/tubings (gpu & chipset w/blocks will be ordered later). i need it to have enough power to cool well. so, what is better?

---

Buy the D5 and use it with fittings/tubing that at least 10 mm ID have! In the same loop D5 makes me always better flowrate like DDC...

Quote:

---

Originally Posted by L'enFer

please help me to choose one of these pumps: Laing D5 or Laing DDC Ultra. i heard D5 is more reliable and quieter, but noise isn't that i'm warning about. i'm going to order D-TeK FuZion, Thermochill PA120.3 and fittings/tubings (gpu & chipset w/blocks will be ordered later). i need it to have enough power to cool well. so, what is better?

---

i think that the reason that people have a presumption that D5 is a reliable bump is that is not as popular as the ddc pumps.. there fore there isn't that many RMA´s done. there was a thread about this here at XS.

but i have both of those pumps and both are really good. personally i like ddc better over the D5 just cos the simple fact that it's 2 times smaller that the d5, it's more versatile when mounting it too imo.

Quote:

---

Originally Posted by Solarfall

i think that the reason that people have a presumption that D5 is a reliable bump is that is not as popular as the ddc pumps.. there fore there isn't that many RMA´s done. there was a thread about this here at XS.

but i have both of those pumps and both are really good. personally i like ddc better over the D5 just cos the simple fact that it's 2 times smaller that the d5, it's more versatile when mounting it too imo.

---

In a Stacker no reason to buy a DDC just because it's smaller... In a Stacker I have two D5... But in a Stacker you have place for 4 D5 too :D

Quote:

---

Originally Posted by R.Zoli

In a Stacker no reason to buy a DDC just because it's smaller... In a Stacker I have two D5... But in a Stacker you have place for 4 D5 too :D

---

yeah i know not say it's not possible... it's just that i prefer ddc better that d5..cos well they are more powerful pumps when compared to d5.

thanx to all.

Hi
Does anyone know where you can buy iwaki pumps in the UK.
Thanks

Rob :D

Robump, actually, i'm not sure you will be able to find Iwaki pumps in UK. i can be mistaken, but i think they are only sold in USA. you can find smbd here and ask him to send it to you...

Quote:

---

Originally Posted by Robump

Hi
Does anyone know where you can buy iwaki pumps in the UK.
Thanks

Rob :D

---

You can buy one on ebay, link: http://cgi.ebay.com/Iwaki-MD-20RLT-p...QQcmdZViewItem

Do the (W)MD20's work with 220v?

Well there must be Iwakis in the UK - I managed to find a company that sells them in Greece.

Good morning guys....
I want to buy a new pump for my watercooling and i am confused...
I mostly want one pump for put it in the tank because i have a custom made tank...
The pump i have now is a seltz L20 and i want something about 1200 or 1500 lt/h..
BUT...Here in greece i can find only some products...
Can you explain me if any pymp of these can work in the tank?

1)Swiftech MCP655
2)Laing D5 vario
3)Eheim 1250-790 230V full ceramic
4)Eheim 1250 230V

the first two are the same pump and cannot be submerged.

The second two are not very useful for watercooling due to their low head pressure.

I suggest you DO NOT submerge any pump in water for your watercooling loop because it will add a significantly larger amount of heat into the loop than would a non-sumberged pump.

Lastly, all of the commonly used watercooling pumps cannot be submerged, and the few pumps that I have seen that can be submerged are of low build quality and are not well suited to watercooling.

Please check out my watercooling guide for basic information on what pump to choose. Then read this guide.

I would suggest that you add the D-Tek db-1. It is a weak pump but rated to 50,000 hours and has the same ceramic mag dirve impeller we all love. It is very small and virtually silent. I personally own so many of these I have lost track and they work great in a low restriction single block loop. I currently have two of them cooling my two q6600 rigs with FuZion and GTX (bowed) blocks and PA 160 rads...for $50 it's hard to ignore a pump that still gets the job done.

Small, quiet, recommended only for low restriction single block loops. Seems to have a low heat dump (no hard numbers).

Definitely the "new kid on the block" but worthy of including in your list.

Nice thread!

Hi,
pls. has anyone heard about this pump and what do you guys think about it.
Alphacool AGB-Eheim 600 Station II 12V. Here is a link to the site but it´s all in German lang.
http://www.alphacool.de/product_info...on-II-12V.html

Quote:

---

Originally Posted by Shocker003

Hi,
pls. has anyone heard about this pump and what do you guys think about it.
Alphacool AGB-Eheim 600 Station II 12V. Here is a link to the site but it´s all in German lang.
http://www.alphacool.de/product_info...on-II-12V.html

---

Eeeewww! It's AC powered and it's very weak (51" of head if my math is right). My CSP-Mag has bigger cojones than that pump.

FYI for those of you on the hunt for the discontinued DDC-2 18w pumps, the koolance pmp-400 pump (originally a rebadged laing DDC-2) is now shipping the DDC-3.2.

I know this question has been asked about a zillion times. Here goes again, my question is: for a rig (hopefully a new penryn quad q9450) would a MCP350 (even with a stock top?) be sufficient for folding 24/7 at 3.0 GHz or 3.2 GHz
The rigs enviorment temp (even in summer, AC) will be about 21c to 22c.
I have a E6600 with a Apogee GT and MCR220 rad with a little MCP350 (stock top) and I love it :clap: . It has been folding 24/7 for about 6 months now without any problems. It's so quiet I have to check the micro res to make sure it's still pumpin'.
Do you think it would be wise for me to go with a D5 or another pump? (not a Iwaki anything, too expensive for me :shocked: , maybe a AquaXtreme 50Z DC12 :shrug: )
I really do appreciate any advice from this forum because it has some of the best WC'ers on the net IMO. Thanks in advance :D

Hey jws2346 :)

Yes, the pump is sufficient especially at those speeds. The MPC350 is pretty strong and you should be looking more at a new radiator if you want to improve the performance.

I'm currently researching a lot for my future WC setup for 24/7 folding like you. I might pick a MPC355 with a PA120.3 radiator. The radiator is what help dissipate the heat out of the water loop. The pump is just pushing water around and with only the CPU in the loop, that pump is ok.

Quote:

---

Originally Posted by Xilikon

Hey jws2346 :)

Yes, the pump is sufficient especially at those speeds. The MPC350 is pretty strong and you should be looking more at a new radiator if you want to improve the performance.

I'm currently researching a lot for my future WC setup for 24/7 folding like you. I might pick a MPC355 with a PA120.3 radiator. The radiator is what help dissipate the heat out of the water loop. The pump is just pushing water around and with only the CPU in the loop, that pump is ok.

---

Hey Xilikon::)

Thanks for the response. I understand about the radiator performance thing. I have no complaints at all concerning the MCR220. While it's folding 24/7 according to Core Temp and SpeedFan my temps never get beyond 38c
What my main concern is if the MCP350 would be reliable (not strained) cooling the quad. (like you, I don't think it would)
As far as the MCP350 vs MCP355, no more than I overclock, do you think it would be a wise choice to cool, probably, a Q9450 with a Apogee GT,
Apogee GTX or a D-TEK FuZion WB. I haven't made up my mind yet on which block. I even like the looks of the AquaXtreme MP-05 SP Limited Edition.
What's the main differences between the 350 and the 355. More power, more reliability, what?
What about the AquaXtreme 50Z-DC12 ? :confused: