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  #11 (permalink)  
Old October 21, 2009, 01:35 PM
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Quote:
Originally Posted by Dead Things View Post
Interesting idea. The PA120.2 strong enough for an overclocked i7 860 you think? It will, after all, be the only heat load in the loop aside from the marginal load dumped by the MCP655. I have zero plans for looping in anything on the mobo.
More than enough.
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Old October 21, 2009, 01:36 PM
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I have an extra MCR220 for sale in my thread, good condition, $25...that is if 1 doesn't work out for you.
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Old October 21, 2009, 02:38 PM
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Thanks JMCD. I've actually got three though - not sure how that happened.

Anyway - cool. I'll think about looping the 120.3 in with the GPUs and the 120.2 in with the CPU. Doing that will cause a great deal more tube clutter in the case though - so we'll just see how it goes. Thanks all!
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Old October 21, 2009, 03:29 PM
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For what it's worth, some very (very, very) rough numbers:

Say 110W/GPU = 660W total. A MCR220 with ~1600rpm fans should be able to dump around 330W of heat with the coolant about 10*C above the ambient air temp. So it should be able to dump about 660W with the coolant about 20*C above ambient air temps. Even if your ambient air temperature is a little high - say 30*C, your coolant is still going to be about 50*C, which is nothing to cheer about, but you'll have loads of headroom where the GPU's are concerned, and your coolant won't be warm enough to concern the water pump.

Those are pretty pessimistic numbers, and you'll be running stronger fans. So while you won't be setting any temperature records, you should be just fine.
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Old October 22, 2009, 12:38 PM
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For what it's worth... So while you won't be setting any temperature records, you should be just fine.
That's exactly the good news I was hoping for! Yeah, I don't really care if the GPUs are running at 40 or at 70 on load - as long as they are kept cool enough to work. I may still try to fit the PA120.2 in there anyway, just to help out a bit more.

Thanks!
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Old October 26, 2009, 10:36 AM
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Quote:
Originally Posted by MpG View Post
For what it's worth, some very (very, very) rough numbers:

Say 110W/GPU = 660W total. A MCR220 with ~1600rpm fans should be able to dump around 330W of heat with the coolant about 10*C above the ambient air temp. So it should be able to dump about 660W with the coolant about 20*C above ambient air temps. Even if your ambient air temperature is a little high - say 30*C, your coolant is still going to be about 50*C, which is nothing to cheer about, but you'll have loads of headroom where the GPU's are concerned, and your coolant won't be warm enough to concern the water pump.

Those are pretty pessimistic numbers, and you'll be running stronger fans. So while you won't be setting any temperature records, you should be just fine.
Heh MpG, where did you get this data from? It was very helpful.
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Old October 26, 2009, 12:04 PM
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The radiator numbers I used came off Skinnee's triple rad comparison testing. To get numbers for a double-rad, I basically cut the performance by two-thirds (radiator ability basically scales linearly according to size), and then extrapolated the numbers from there with some basic math. Watercooling is convenient in that conductive heat transfer scales linearly within the range we operate in, and there's no phase change issues (i.e. heatpipes) to foul things up. Just the same, I tried to pad those calculations pretty pessimistically, just to make sure.
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Old October 27, 2009, 07:22 AM
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Thanks again MpG - could you please let me know if I'm reading those Watts Dissipated graphs correctly?

Let's assume I will be using 2k RPM fans... At a 10C delta, the MCR320 can dissipate about 640W of heat load, and a PA120.3 can do 690W. If we scale linearly down to 240-series rads, then the MCR220 could do roughly 425W and the PA120.2 could do roughly 460W. So if I'm dumping about 660W on those rads, we would be looking at a delta of about 16C for the MCR220 and about 14C for the PA120.2, right? In which case, there is really only about a 2C benefit to using the PA120.2 instead of the MCR220. Thus, if it's more convenient for me to use the MCR220 due to space issues - then that's what I should do.

Is that right?

Thanks!
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Old October 27, 2009, 10:22 PM
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Yep, that's how the math would work.
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Old October 28, 2009, 07:46 AM
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Cool - thanks!
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