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Radiator Size Discussion

post #1 of 7
Thread Starter 
Hello,

I am interested in water cooling a 4770k and either two 780's or two Titans (All Overclocked). According to reviews, the 4770k overclocked to 4.8ghz leads to a system usage of 183 watts under load. Also, the 780 overclocked uses about 360W. The Titan overclocked uses about 406W (correct me if I'm wrong on this one).

So we have:
4770k 183W
780 360W
780 360W
Total: 903W

or

4770k 183W
Titan 406W
Titan 406W
Total: 995W

The rule of thumb I have heard is to divide total wattage by 150 and then multiply that number by 120 to determine the amount of surface area needed. Unfortunately, the link given for a more detailed explanation is no longer active (http://www.over-clock.co.uk/ivb/inde...howtopic=20277).

Using this rule we have:

903W/150 = 6.02 x 120 = (720)

and

995W/150 = 6.63 x 120 = (840) 796

I have read that a 10 degree water delta is what you should aim for. What are your experiences?

I would like to use GT AP-15's or equivalent at about 1000-1200 rpm in a push configuration. So what do you guys think? Does this setup require 720-840mm of radiator? Is there a more accurate way to calculate required radiator space?

Thanks
post #2 of 7
Your close enough. Two Alphacool 360 UT-60's would work nicely with the AP-15's.
Edited by theseekeroffun - 8/21/13 at 3:25pm
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post #3 of 7
your estimated wattage is high since using total system power instead of just component, but I agree with theseekeroffun and your 720 est, in I would get 2 x 360 rads for your setup. I also like the same rad he recommended, not only one of best performing, but has screw guards so dont have to worry about screws being too long by 1 mm or so and puncturing the rad, my next rads will be the alphacool just for that reason.

cpu oced will be closer to 100W, each gpu oced will be max ~300W titan or 780. And you will never fully load both cpu and gpu, so you will be cooling less.

With 2 x 360 rads, and 1000 or 1200 rpms fans, running prime 95 on cpu your wattage will be max 250W (cpu loaded, gpu's idle), and delta will be ~7C....or closer to 5C if when stress testing you run them at 1600-1800rpms and turn them down to 1000 rpms when gaming, etc. Only if doing something unnecessary like running furmark + prime will be get a delta at 10C or above with 2 360 rads and fans you plan.
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post #4 of 7
What case?
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post #5 of 7
Thread Starter 
Quote:
Originally Posted by theseekeroffun View Post

Your close enough. Two Alphacool 360 UT-60's would work nicely with the AP-15's.

Thanks for the input! 720mm worth of UT-60's would be really solid! I like the UT-60's a lot, but what are your thoughts on the value of going from 30mm to 45mm to 60mm? Acording to martin's liquid lab, the jump from 30mm to 60mm only allows for 11 more watts of heat dissipation at 1400rpm. An extra 3cm thickness is a lot!

Quote:
Originally Posted by opt33 View Post

your estimated wattage is high since using total system power instead of just component, but I agree with theseekeroffun and your 720 est, in I would get 2 x 360 rads for your setup. I also like the same rad he recommended, not only one of best performing, but has screw guards so dont have to worry about screws being too long by 1 mm or so and puncturing the rad, my next rads will be the alphacool just for that reason.

cpu oced will be closer to 100W, each gpu oced will be max ~300W titan or 780. And you will never fully load both cpu and gpu, so you will be cooling less.

With 2 x 360 rads, and 1000 or 1200 rpms fans, running prime 95 on cpu your wattage will be max 250W (cpu loaded, gpu's idle), and delta will be ~7C....or closer to 5C if when stress testing you run them at 1600-1800rpms and turn them down to 1000 rpms when gaming, etc. Only if doing something unnecessary like running furmark + prime will be get a delta at 10C or above with 2 360 rads and fans you plan.

Thank you as well for your input opt33!

I do realize that my estimated wattage is high (I'd rather over-estimate than under-estimate = ) The screw guards on the alphacools are most excellent! What do you think of the alphacools of 30mm and 45mm thickness? They perform fairly close according to Martin's Liquid Lab for my intended fan range (<1400rpm)

That is an excellent point you bring up about not ever fully loading the CPU and the GPU's at the same time. Again, I guess it's just overestimate =)

Thanks for the delta estimate as well. I am only interested in a solid <10 degrees C delta for real usage. If the delta is higher for benchmarks, I could care less. I'm not interested in benching or setting records personally (not that there is anything wrong with that!)
Quote:
Originally Posted by givmedew View Post

What case?

Hi there givmedew!

I don't have any dew to give you, but I can tell you that I will chose a case based on my cooling needs. I am patient and I will wait to see how much radiator you guys think I will need before i find a suitable case that will accommodate it =)
post #6 of 7
Thread Starter 
givemedew already chimmed in at another thread i started regarding radiator thickness, would you also care to contribute?

http://www.overclock.net/t/1420572/how-important-is-45mm-and-60mm-to-you

Regarding the system I am building described in the OP:

+ I definitely like the alphacool rads, what else do you guys like?

+ What kind of performance do you think I could get with this system using 2x(280mm) and 1x(140mm) radiators with the correct 140mm fans? (That's 700mm of radiator). Such a setup would allow for a lot more flexibility than 2x(360mm) radiators.

+ What kind of performance do you think I could get with this system using 2x(240mm) and 1x(120mm) radiators with GT-AP 15's or equivalent at <1400rpm? (That's 600mm of radiator). This setup would allow for maximum flexibility.

Again, thanks for the feedback!
post #7 of 7
If you go with Case Labs, you can do whatever you want.
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