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head peressure or flow rate?

Poll Results: which one?

 
  • 46% (6)
    MCP 655 w/ top
  • 53% (7)
    MCP355 w/ top
13 Total Votes  
post #1 of 10
Thread Starter 
my loop:
-XSPC RASA cpu block
-SLI (2x) EK GTX 470 waterblocks
-Phoyoba EXTREME QUAD 480 (from what I hear it is similar in construction to the Heat Killer rendition on this big square radiator model... Which means it is restrictive in terms of flow)
-Danger Den Fillport Res
-Pump:
-1/2" ID tubing

would it be best to get a MCP 355 w/ a top to add head pressure and make it 1/2" viable... or should I go w/ the MCP 655 and also buy a top for it... basically I prefer the low noise aspect of teh MCP 655 but I'm not sure if it would be the best choice considering I'd have a big rad and 2x GPU blocks. Would adding a pump top to teh 655 make it competitive w/ the MCP 355 as far working in my loop goes?
Edited by Frosting - 4/14/11 at 9:59am
    
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post #2 of 10
I own a 655 with the swiftech top. I also have the supreme HF, 2 gpu blocks (EK), 360 and 240rads and no issues at all. Cant hear the pump, only the fans.
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post #3 of 10
Adding an aftermarket top to the 655 doesn't increase performance by much.

I didn't vote because either one should work fine... but for some reason, I've been feeling more fond of the 655 lately.
post #4 of 10
655 will work well with your set up I wouldn't buy the top for it though. You do not need the increased head pressure the 355 offers and the 655 is quieter. So my vote is to the 655 (which i also use). You can consider the B version as well if you want to save a few $.
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post #5 of 10
Quote:
Originally Posted by Arksniper View Post
655 will work well with your set up I wouldn't buy the top for it though. You do not need the increased head pressure the 355 offers and the 655 is quieter. So my vote is to the 655 (which i also use). You can consider the B version as well if you want to save a few $.
How much decibel the 655 ? it is way quieter than the rasa 750 pump ?
    
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post #6 of 10
I own a 355 with alphacool top, and it works great for a loop with cpu + motherboard + vga + 2 radiators.
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post #7 of 10
I have two 655s with the 5.25" bay top and they are very powerful and very quiet.
post #8 of 10
Swiftech DDC 3.2 MCP355, super quiet and small. I like that it has lots of aftermarket accessories to it.
post #9 of 10
Both are great pumps, that can pump enough water to flow through long block heavy loops. I have a 655-b with a cheap-o top for 1/4 threaded fittings, two blocks, two rads, 7 feet of tubing, 7 90 degree fittings, two 45s, and it still flows like a champ. However the 355 is quiet enough for most systems(my 655 is barely audible), it does have a more compact design that may be more desirable. The 355 has more head pressure though so if your going to eventually cool your motherboard, especially with multiple blocks, it may be a better option.
Edited by freakman300 - 4/15/11 at 7:01pm
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post #10 of 10
Flow rate does not have a huge effect on temperatures past 1 GPM. Since both pumps will easily provide that, you should make you choice based on factors such as power consumption, noise and form factor. The 655 is slightly quieter than the 355 + Top, however it uses about 30% more electricity and is quite a bit larger. If you leave your rig on 24/7 the difference in electrical draw amounts to around $10/yr.

Personally I would get the MCP35X, it costs about as much as a 355 + Top, comes with threaded fittings by default and is quieter than either the 655 or 355 when the PWM control is used.
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