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New here, could use some radiator advice

post #1 of 11
Thread Starter 
So I'm new to water cooling and right now am in the planning stages of my build. I've spec'd out roughly what components I need and calculated that I'll need to dissipate in the ballpark of 600 watts. I've been looking a various sites to try and get an idea of how much radiators and what temps I'll be getting, but there seems to be a lot of discrepancies between sources.Take for example, I was looking at an hwlabs gtx 360 and can't find out how much watts it dissipates. Looking at martins liquid lab review (http://martinsliquidlab.org/2012/04/09/hardware-labs-gtx-360-radiator/4/) , it says I can expect 245 watts of dissipation at 1800 rpm with a deltaT of 10c. However, another review at skinneelabs (http://skinneelabs.com/hwlabs-gtx-360-radiator-review-data-supplement/3/), suggests that I can get closer to 600 watts of energy dissipation at the same rpm and deltaT. Could somebody shed some light on this matter. Not sure who to believe, since they both look like legit reviews.
post #2 of 11
SkinneeLabs uses a 400W heat supply while Martin uses a heating element at 100, 200, and 300 Watts. When more heat is pumped into a system the radiators become more efficient at dispersing heat. Any radiator can disperse 600 Watts of heat, it's just a matter of what your water temperature will be.

Also, they use different fans and a mildly different testing setup. Changing fans will have a large impact on the performance of a radiator.
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post #3 of 11
Thread Starter 
Thanks for pointing out that the test set ups are a little different Mithrandir, but does it still account for such different energy dissipations at the same deltaT? Ultimately, i want to know if i'm going to be able to run two 360mm rads at low rpms or super high rpms to achieve a 10C deltaT or lower for my build. If it matters, I've got gt ap 15s. According to skinnee, it's possible at low rpms; martin, not so much.
post #4 of 11
I don't understand how they can have such different results either, it seems like Skinnee consistently rates the watts cooling at X delta as around twice what Martin does. The Watts dissipated at X Delta should not be affected by the heat source.

In my real experience I have gotten results far closer to Marting than Skinnee. I have a 7970 and a 3570K cooled by a 240 and a 360 rad. I can maintain a 7.5C delta at around 1500 - 1600 rpm.

That would mean I was cooling around 500 Watts according to Skinnee
Or around 250 Watts according to Martin.

I'm pretty sure my gear is not putting out 500 watts
Edited by Jakusonfire - 5/10/13 at 6:15pm
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post #5 of 11
In general, a 240 rad will suffice for cpu only loop, while adding a gpu a 360 or 360+120 would be best, while doing 2x gpus there + whatever else you add you'll need 360 + 240 at least.
post #6 of 11
I think Skinnee tests with 6 fans, while Martin does push only? Maybe that accounts for some of the difference.
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post #7 of 11
Thread Starter 
Quote:
Originally Posted by WiSK View Post

I think Skinnee tests with 6 fans, while Martin does push only? Maybe that accounts for some of the difference.

Could account for some difference, but definitely not all of it
post #8 of 11
Looking at the data from SkineeLabs I don't like how they list "Watts dissipated" in the resultant data section. I may be interpreting their testing methodology wrong, but it sounds like they are calculating the total wattage removed via the radiator rather than directly measuring it. If they ran an aquarium heater at a constant rate you would expect the total number of watts dispersed to be much closer to some fixed number. Although it will be hard to have a heater produce the same amount of heat exactly for each trial, over a 4 hour window the averages should be much closer than those listed in the excel sheet.
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post #9 of 11
what are you planning to cool? please list all details.
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post #10 of 11
Thread Starter 
Quote:
Originally Posted by pc-illiterate View Post

what are you planning to cool? please list all details.

I have a 3570k, and a gtx 680 at the moment. I was originally planning on adding a second 680 and then putting it all under water. However, with the 700 series looking like they're going to happen soon, I may just sli some 770/780s. In either case, I imagine i will be dealing with a heat load of around 600 watts given a slight overclock. I was planning on getting two 360mm hwlabs rads with my gt ap15s, but according to martin I will not be able to achieve even a 10c deltaT at stock gt ap15 rpms.However, If skinnee's performance testings are accurate I should have no problem cooling my build.
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