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First WC build - couple of questions

post #1 of 5
Thread Starter 
Hi all,

Long time lurker here, don't post much. I've posted a thread or two about this in the last few months, but this time I'm actually in a position to get ordering in the next couple of days.

Edit: I should mention that noise would be a priority here. If the pump top/pump model for example is known to be noisy, I'd appreciate a better option.

Cooling components:
RX360 rad
XSPC Rasa block - already on the way
EK 580 block
MCP655 pump + rev.2 EK top
3x Akasa Apache fans (1350rpm, 2.64mm H20, ~50cfm)

Cooling:
i7 950 @ (hopefully) 4.0/4.2GHz
GTX 580 @ (again, hopefully) ~9-950 core - Possible SLI in the future
In an ATCS 840 case

Questions:
Would I be better with an MCP355? From what I gather both pumps perform about the same, the 355 having better pressure, the 655 having better flow rate. I'm not really sure where each of these traits come into play, and what would benefit me.

Considering possible SLI-ness, would an RX240 help? I'd be mounting it inside the case behind the HDDs twoards the front of the chassis, meaning the air would first pass through it, then through the 360, out the top of the case. I know with stackable rads, the second one doesn't do a lot, and it seems logical that the same would apply here, though I don't really know, so.

Any other general comments?

Thank in advance.
Edited by Serephucus - 2/1/11 at 5:03pm
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post #2 of 5
Parts list looks good, although I would get the MCP35X Pump. It's more powerful than either the 655 or 355, comes with threaded fittings by default and has PWM capability.

You are correct that stacking radiators is useless, the air is too warm after passing through the first to be of any use on the second. A similar effect would occur here. However, if you do want more radiator (it would definitely help with an SLI setup like that) you could either hang a radiator off the back or just put a single RX120 onto the rear fan.

Also, if you really want a quiet rig I would get some GentleTyphoons, a member on these forums tested over 50 fans and found the GentleTyphoons to be the best by far in terms of noise/cfm (tested using a DBA meter, hot wire aerometer and some other fancy testing equipment). The 1450 RPM variant would push more air than the fans you listed while being quieter.
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post #3 of 5
Thread Starter 
Thanks, I'll have a look into the pump.

I was thinking of that as well, however, if I had a 120 in the exhaust slot, that would mean only having one - admittedly very large - intake fan. I'm not sure how a case with that much negative pressure would work. I'd like to mount it as an intake to balance things out, but then we're back to the original dilema.

I have it on good authority from someone on another forum that did similar tests these are better. Not saying I trust that 100%, but GTs are difficult to get in Ireland. Also, I run these fans at 7V, and I dunno how GTs sound undervolted (I'd assume pretty good or they wouldn't be so widely recommended)
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post #4 of 5
Remeber that fans only push about 1/2 of their airflow through a radiator, so even if you had a 360 and a 120 as exhaust it'd really only be like having a 200mm intake an 2 x 120mm exhaust. You'll be fine.
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post #5 of 5
Thread Starter 
Yeah, that's true, I didn't take into account resistance of the rad. It's also a 230mm intake, supposedly pushing ~75cfm.

Just ordered my parts! Should hopefully be here by Monday.
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