Is the MCP350 good for the Nexxxos XP and my WC setup (noise and performance)

[nanyangview]

These are my original WC equipments

Pump
http://www.alphacool.de/perl/shop.pl...&&art_id=15119

and this is my radiator (mora 2 pro)
http://www.coolputer.fi/non-ses/tied...=1097&lang=eng

my waterblock will be the Alphacool Nexxxos XP reviewed by this site:
http://www.procooling.com/reviews/ht..._waterbloc.php

Computer Components to Cool:
AMD X2 4800+
2 X ATI 850XT PE (Crossfire)
Northbridge

and 2 SCSI HD (15.3 Cheetah and 10K Fujitsu) in this HD watercooler:
http://www.alphacool.de/perl/shop.pl...4&art_id=12410
---------------------------

Now, i am keeping that original pump and decide to get another one and run it in series to increase the flow rate since my radiator has 24 meters of piping. So i am getting another pump to run it in series. I am looking at the MCP 350 and it looks like a good canditate as it is small, powerful and quiet.

My first pump's flow rate is rated from 300l - 1000l/hour while the MCP350 is rated 350L/h..will it be the bottleneck of the loop?

Will the MCP655 better suit my needs due to its high pressure and high flow rate? How noisy is this pump? I am trying to build a very quiet computer

[wengchiochan]

ihave a friend who is using the sme block and same radiator as u.

he has nexxos cpu, nb and gpu block, with 2 MORA (yes, TWO MORA2pro)

he was using a DDC in the system, but he finally switched back to his 1046 because he thinks the DDC makes a very annoying noise compared with 1046. (by the way, he uses 2 mora passively, so the only component that make noise is the DDC)

anyway, when he switched back to his eheim 1046, he only gets 2c higher than when he was using DDC.

i am using DDC too, its makes some annoying noise even compared with the 3 fans at 800rpm that i used on my radiator. so, now i have switched back to eheim pump too.

so, if u are looking for a quiet computer, stick with what you have,(or just get a DDC, dun even think of D5, its noiser than DDC) if u care about that merely 2-3c of cooling performance, get a D5. oh, one more thing, u will have to use 1/2inch ID tubing if u are gonna use D5, using smaller hose on D5 will just decrase its performance badly which loses the point of getting D5.

[bobkoure]

"more than 24 meter copper pipe...triply parallel through 60 pipe rows"
Even "triply parallel" 24 meters mean each run of tubing would be 8m long and have 18 (60/3 - 2 (assuming no bend at inlet+outlet)) almost-360-degree bends. Beats me why they didn't just manifold it.
The nexxos xp (procooling review) looks to be even more restrictive than the Storm - not only is it an injector-plate design but the inlet is offset - so the water flow hits a restriction and immediately has to make two right angle turns, go through the plate and do "whatever" in the grid.

From the review (and my guesses about the radiator) you'd need at least a MCP 350, which, unfortunately is not reported to be that quiet. So maybe a sound enclosure for it? Or possibly the MCP 600, which is reportedly quieter - and I think there's a new version of the 650 out which is supposed to be quieter than the "old" 650 - has a built in "speed control dial" apparently, so you can find your own balance between performance and noise.
You might also think about the new CSP-MAG pump (systemcooling review - which is reportedly very quiet and has a pressure head similar to the Eheim 1250 (half of the mcp350) - so look at the "1250" performance for a relative notion of how it might do with your restrictive setup.

Originally Posted by wengchiochan

oh, one more thing, u will have to use 1/2inch ID tubing if u are gonna use D5, using smaller hose on D5 will just decrease its performance badly which loses the point of getting D5

Got numbers/measurement for this? In the above system (parallel flow through 3 sets of 8m tubing with at least 18 tight bends and a nexxos xp) I'd be surprised if even someone with very good instruments could measure the flow difference between, say 1.5m of 1/2 ID tubing and 1.5m of 3/8 ID tubing - let alone there be a temp difference.

[nanyangview]

thanks wengchiochan and bobkoure for the detailed response..but excuse me for my nOObness..what is a DDC??

[wengchiochan]

i dun have any figures to prove it. but i definitely saw it somewhere. (or i heard somebody who told me about it)
anyway, the D5 only support 1/2inch ID hoses, unless you are willing to use one of those ugly hose adaptors so u can use 3/8inch hose on the D5...

[cotdt]

DDC is the Swiftech 350. Are you going to build a silent computer by adding a ton of fans onto the Mora? Or are you going to run it passively with no fans? If passive, go for a low air-restriction radiator such as a Konvect-o-Matic or if you have the skills you can make your own for much cheaper. For pump, check out the CSP-MAG. A muffled CSP-MAG can be made inaudibly silent. It's quieter than the DDC (Swiftech 350), which I had bad experiences with start-up issues.

[Risky]

If you're already ording from alphacool They sell that pump too http://www.alphacool.de/perl/shop.pl...130&art_kz=139 and you can get it with the lid that offers G1/4 tapped ports.

[JWFokker]

I have an MCP350 and not only is it extremely quiet, but it's been nothing but reliable. I'd hold off on buying a CSP-MAG, as the original CSP pump and some reliability issues. Or inherent design flaws, depending upon who you ask. Then again, an Eheim 1046 is very quiet (quieter than an MCP350 even) and very reliable. If you can live with 1-2C higher temps in your quest for silence, that'd be the way I'd go.

[bobkoure]

Oh - and there's the Innovatek HPPS (12VDC version of the 1046 built by Eheim but AFAIK only available through Innovatek).
No-head performance like a 1046, high head performance like a 1048 and even quieter than a 1046.
I have two, both in low-noise PCs. The one in my under-desktop PC has been running 24x7 for the last two years or so. The other one is similar age and I think it gets run 24x7. No problems with either one.
They're fairly expensive (about $100 when I got 'em - or about double the then-going-price for a 1046) but very quiet and so-far quite reliable.

I've been hoping the CSP-MAG (particularly the possible sapphire-on-sapphire bearing prototype Dave has mentioned as being very quiet) might be a replacement for this pump. Half the price, more high-head flow - if the low-noise and reliability is there it's a definite winner for the low-noise market.

Either way, if I was using a low noise pump and a high resistance radiator (which I believe you have) I'd use something like a Swiftech 6000, which performs quite well at the flows I'd expect.