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Dual MCP355 or MCP655?

post #1 of 28
Thread Starter 
Trying to decide on which pumps to buy for a dual pump configuration (single loop).

Loop:
EK-Supreme HF x1
EK-FC GTX580 x2
EK-FB Max4 Extreme x1
HWL GTS 360 x1
HWL SR1 480 x1
Drain port

The most obvious two options are;
2 D5 MCP655 pumps + EK D5 Dual Top or...
2 DDC MCP355 pumps + EK DDC Dual Top.

Just don't know what the best option for me would be.
Help appreciated!
post #2 of 28
Get an eheim 1250 instead my good man.
post #3 of 28
Thread Starter 
Any reason why? The 1250 is apparently big, AC powered, and has a lower output pressure. Even more space taken up considering I would have to connect them in series myself in comparison to the D5/DDC which I can accomodate in a neat dual top.
post #4 of 28
Go for 2x DDC in the EK Dual DDC Top V2.

Why?
1) You'll have quite a bit better flow in your high restriction loop
2) Less space used
3) It's not much more noisy in closed case provided you're not carrying vibrations to the case

However, make sure you provide them with good cooling - either some fan or heatsink + fan.
Until I've mounted all my 3 into Koolance heatsinks they were @ 60C...

Alternatively, D5-Strong (with 12-24V converter) is a good choice too.

I've recently compiled flow results in my rig across almost 10 revisions with various pumps/blocks/fittings combo so it might help you to decide what to do and what expect.

Flow comparison in high restriction loop

Yeah and forget Eheim. They look good on paper but they are not that good in high restriction loops.
    
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post #5 of 28
Two DDCs with tops would get my vote. They dump less heat and produce more pumping power.

I would also suggest some active cooling on the pump bases though, just need to air flow running across or buy some heatsinks.

The advantage of D5s is they don't need any help cooling (Metal pump casing makes them more water cooled), and you can manually turn them down pretty easily. They also run a touch quieter at full speeds than the DDCs.

A pair of 35X motors under PWM control would allow temp throttling the pumps too (High speed when you need it, silence when you don't), but you would void your warranty changing out the top same as the others.

FYI, with a simple G1/4 coupler you can do this too:
    
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post #6 of 28
Thread Starter 
Thanks luke. I'll go with your reccomendation, and grab a couple of heatsinks too since 60c does seem high. what kind of temps are you getting with the koolance heatsinks?

I had a look at your flow comparison earlier, and it's quite interesting. At the moment I have the EK parallel SLI bridge + 2 links on my list but you actually swapped out the same thing for a standard bitspower tube link in series. It's hard to gauge the effect on flow from just that through Rev 1 to 1.1 since you added a few 90' fittings at the same time. What are you thoughts on this?
post #7 of 28
Quote:
Originally Posted by Martinm210 View Post
that's so ridiculous it's awesome
Edited by somebadlemonade - 5/27/11 at 5:52am
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post #8 of 28
Quote:
Originally Posted by Glancey View Post
Thanks luke. I'll go with your reccomendation, and grab a couple of heatsinks too since 60c does seem high. what kind of temps are you getting with the koolance heatsinks?
If you have funds left I would go with Koolance HTS-PMP400, they dropped my temps from 60C to 29C (I should add with it I can't stick temp sensor that much inside as I could before so realistically it might be few C more).

I've had previously 2 DDC directly over the fan - and I've cut the plastic housing for cooling - and 1 pump died anyway - hence I would rather advise to go with full heatsink.

Here's my quick guide how to mount it on Dual DDC Top if you're fine with dremel:
Fitting Koolance HTS-PMP400 on EK Dual DDC Top



If not, you can go with 2 single EK DDC V2 tops with no modifications

Quote:
Originally Posted by Glancey View Post
I had a look at your flow comparison earlier, and it's quite interesting. At the moment I have the EK parallel SLI bridge + 2 links on my list but you actually swapped out the same thing for a standard bitspower tube link in series. It's hard to gauge the effect on flow from just that through Rev 1 to 1.1 since you added a few 90' fittings at the same time. What are you thoughts on this?
Considering my results, they won't make much difference - up to your taste / performance expectations really.

Although those EK bridges are not restrictive, you'll still have few more sharp 90' bends more in your loop comparing to the straight links like BP crystal.

On another hand I've had ~15% flow increase after removing a total of ~27 x45 bends in my loop so this few, relatively high flow 90's in the EK bridge won't hurt your flow that much.

So if your priority is looks - go with EK. If every single l/h and 0.1C - straight links
    
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post #9 of 28
Quote:
Originally Posted by somebadlemonade View Post
that's so ridiculous it's awesome
Yeah, it's quite cool

I went similar route with my 3 DDCs and connected Dual DDC EK Top outlet to the single DDC EK Top inlet with the G1/4 coupler

(You can see it on the third last photo on my v3.0 photos link, a bit dark but can be seen)

The gains in my loop were:
From 1 to 2 pumps - 50%
From 2 to 3 pumps - 28%
    
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post #10 of 28
Quote:
Originally Posted by somebadlemonade View Post
that's so ridiculous it's awesome
Want more?

And these are not mine, these are from Stephen's corner.

The 35X Christmas Tree...6!
    
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