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Old 03-03-2008, 12:32 AM   #1
chronostorm
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MCP655 vs MCP355

Hey guys, I'm new here, so please go easy on me

my question is this:

Which pump is better, the mcp655 or mcp355? Everywhere I look, there are mixed feelings about these pumps, with some saying the 355 is better, and others saying the 655 is better. Here, many people are saying the 355 with a modded top is better.

Which one actually is?

Thanks alot!
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Old 03-03-2008, 12:52 AM   #2
es101346
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I would go for the 355 & either

XSPC Premium Laing DDC Clear Acrylic Top

or

Petra'sTech DDCT-01s Custom Acetal DDC Pump Top

Personally, I'm going for the XSPC. Because of common testing results, and it looks better ;]
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Old 03-03-2008, 03:24 AM   #3
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im going from a 655 to a 350/355, i need a smaller pump
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Old 03-03-2008, 01:47 PM   #4
ricecrispi
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Here are the numbers. Note this is with older and stronger DDC +/ultra version. DDC 3.2 is not as powerful.
http://www.xtremesystems.org/forums/...d.php?t=117215

DDC 3.2 with tops review. XSPC comes out on top. Hands down and for second time. NOt the gains at very small with rectricitve loops. approximately .1 GM difference and no more. Normal restriction loops difference in tops is about .2 gpm to .3gpm. From stock DDC 3.2 tops give .5to .7 gpm difference in normal loops., same as have a second pump.
http://www.martinsliquidlab.com/DDC3...opTesting.html

Second test at overclock3d.net but it got removed it seems after receiving heat on XS forums. Reviewer did a decent job and he stood up for it. People just being silly. Results are here http://www.xspc.biz/ddctop.php



Performance is one part of equation. There is also size, noise, ease of installation, reliability, and features. The DDC wins all of these except for reliability since the mcp 655/ D5 pump is a tank.

Last edited by ricecrispi; 03-03-2008 at 01:53 PM.
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Old 03-03-2008, 02:19 PM   #5
chronostorm
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thanks so much for the help guys.

ricecrispi, on the matter of reliability, the mcp355 isn't unreliable by any means, right? It's just less than mcp655, right?

also, jw. what are the noise levels on the mcp355?

Thanks!
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Old 03-03-2008, 02:23 PM   #6
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The mcp355 isn't unreliable, but the 655 is just a beast when it comes to handling the pressure. And the noise levels on the mcp355 aren't bad, but if your trying to run a silent setup, it is not recommended. I rather give up the little noise for the performance. Not like its amazingly loud.
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Old 03-03-2008, 03:07 PM   #7
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thanks for your help!

[EDIT]

o yea, on jab-tech's product page for the 355, it says:

"A Note of Caution!
the MCP355 generates higher audible noise than the MCP350 and MCP655 pumps. This product is not recommended for users seeking silent operations."

Does that mean the 655 is better than the 355 in terms of noise? I've been reading much different reports on most forums. Can anybody confirm? Thanks!

Last edited by chronostorm; 03-03-2008 at 05:39 PM.
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Old 03-03-2008, 06:50 PM   #8
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DDC 3.2 isn't loud at all. Less noisy than MCP655 IMO due to the frequency of noise the MCP 655 emits which is high pitched. I have two DDC 350, MCP655 and used DDC 3.2 for leak test. DDC is silent/almost inaudible and during leak test you can hear when outside the case but definitely not when in it.

With a top the DDC pumps are much quieter according to most users. I have DIY tops so I wouldn't know
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Old 03-03-2008, 11:20 PM   #9
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I have the 655 and I cannot hear it over the sound from my radiator. The only time I really notice noise is when I power up the computer and the pump spools up.
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Old 03-03-2008, 11:24 PM   #10
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Another 655 user who can't hear it except for the spin up upon startup.
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Old 03-04-2008, 03:23 AM   #11
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I cant hear my 655 at all. Only when it is in contact with my case it rumbles due to vibration.

I Have since Got a 350 or a 355 im not sure as it was an ebay auction with a fuzion and a res that i won and he didnt say which it was, it has a custom top though

Im trying to built a Silent system so i hope it is quiet :S if its not i will end up selling it.

Can you change the Speed on the 350/355 like on the 655????
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Old 03-04-2008, 10:21 AM   #12
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as far as I know, the 350 and 355 don't have included speed controllers, but I'm sure there are other ways to do it (perhaps using something like a fan controller to adjust voltage?)
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Old 03-04-2008, 10:28 AM   #13
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Quote:
Originally Posted by chronostorm View Post
as far as I know, the 350 and 355 don't have included speed controllers, but I'm sure there are other ways to do it (perhaps using something like a fan controller to adjust voltage?)
Im curious to know if that would work.
According to the specs of the 355/350 the Sunbeam Rheobuses could handel the load if it would work.
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Old 03-04-2008, 01:07 PM   #14
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I have very silent optimized case. Compared to stock CM 810 stacker case this thing is silent and stacker is a noise maker, it's relative. Foam layered panels, vinyl tiles, 2mm plexi window that covers entire side case panel. All the case fans in this main rig are under 50CFM or under 1400 rpm. The two intakes are 42 CFM 1200 rpm running around 9-10V at idle with open intakes into heatcore with 1 inch shroud. Exhaust and blowhole are yateloon L running about 9V. Also had the corsair HX but downgraded to CM PSU. HDDs are enclosed. Loudest thing is screaming DVD drive.

I can still hear the MCP 655 because everything else at idle is dead silent. If I turn off the pump I can tell it's off but is very small and minimal. If TV is on you can't tell the difference. I can't tell if DDC is on or off when in the case. I also had it in HTPC case and when I changed the DDC from MCP 655 it was noticeable different sound but that case ahanix Divine5 and noisy and cheaper quality then my custom modded CM
Again it's like comparing the sound that comes for hornet or a bumble bee.

You don't need to put DDC under speed control. It will work with DDC 3.1 because it uses 8-10Watts. DDC 3.2 uses about 15watts, less than older 355 at 18 wattts. You can use using two channels on good controller.

Last edited by ricecrispi; 03-04-2008 at 01:20 PM.
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Old 03-04-2008, 03:14 PM   #15
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Quote:
Originally Posted by ricecrispi View Post
You don't need to put DDC under speed control. It will work with DDC 3.1 because it uses 8-10Watts. DDC 3.2 uses about 15watts, less than older 355 at 18 wattts. You can use using two channels on good controller.
How exactly would you wire it to two channels?

The Rheobuses as I already said could do it on one channel since they allow 20(30 on the new model) watts on each, leaving the pumps with more than enough extra watts and amps.

But I'm curious as how to do it with other controllers?
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