Originally Posted by TTheuns
I need to know how much I need for a tri-SLI 780 Ti setup with a 4770K. All in one loop. Since all of it will be overclocked I know the standard (#ofcomponents x 120mm + 120mm) formula won't suffice.
1. Yes, any method that assigns the same vaue to a 130 watt CPU and a 300+ watt GFX card just isn't going to work.
2. Here's a step by step based upon test results available on Martinsliquidlab site
I start every one of my own or a user's builds with "the dream". I plan out the build for a Delta T of 10C. Then I look at the results and see if a) it will fit in the chosen case, and b) if it's within budget.
3. Heat is simply a direct measurement of wattage in all but a few instances. It's all about conservation of energy. All energy must be accounted for. For example, a pump converts electrical energy to mechanical energy which is converted into moving water..... so a pump which draws say 50 watts might produce like 10 watts of kinetic energy and allt he rest is given off as heat.....
A CPU ......a GPU, no moving parts, no kinetic energy, 100% of that energy is converted to heat.
5. Is noise imprtant to you..... if it is, you won't be using anything faster than 200 rpm fans and likely running them at 850 rpm max.
6. Rad thickness does basically squat..... looks cool but really doesn't do the job. Proof is in the pudding:
ST30-360 - 30mm thick - 219 watts @ 1250 rpm
XT45-360 - 45mm thick - 222 watts
UT60- 360 - 60 mm thick - 227 watts
Monsta - 360 - 86mm thick - 239 watts
So doubling ya rad thickness from 30 to 60 gets ya a whopping 3.6% increase in cooling
Each 780 Ti is going to draw about 300 watts overclocked about 25%....a LGA 2011 OC'd CPU about 230....add 40 watts for the MoBo of cooling that, 20-40 for the pump, 3-5 for each RAM stick. For arguments sake:
MoBo Block = 20 watts (VRM only)
780 Ti = 300 watts x 3
LGA 2011 CPU = 230 watts
Swiftech 35X2 = 40 watts
That's 1190 say 1200 watts.
Assuming 60% of that actually gets handled by the rads (rest lost to to inactivity ... everything not peaking at once, tubing, res, shrouds all radiate heat) leaves ya with 720 watts.
XT45-420 @ 1650 rpm in push / pull = 391 watts in top of case
Monsta-360 @ 1650 rpm in push / pull = 383 watts in bottom of case
That's 774 watts which should leave ya with a theoretical Delta T of 9.3C. Now I should correlate that with my on direct experience on my last build. I have twin 780s and a 4770k, 35x2 and MoBo block. My theoretical Delta T was 11.3C. I wound up with 8.4C with fan filters removed and 12.8 with fan filters in place....so the method did pretty good.
You can find all the rad data in the files ya can download in the link above. 1650 rpm is a bit load for me .... but in normal gaming you should be able to keep to about 2/.3 of that speed....1050 or so.
I'd recommend the Phanteks Enthoo case which will easily fit those rads ...on the downside, ya can't use the very excellent Phanteks fans which top out at 1250 rpm for ya rads. If ya drop down to just two 780s (the 3rd really does not give ya much, not only would have save the $700 card, but ya could get away with a 420 + 280 and 1250 rpm fans running at 850 rpm for an extremely quiet rig.
Then again, if ya wanna keep the 3 cards, and ya can live with a Delta T of 14C, you could expect CPU temps of about 75, GPU core temps of about 48C (VRMs @ 54C) with an ambient of 22C and 36C coolant temps.....all with just a 420 + 280 in P/P at 1250 rpm..... knock off @ 2C if ya take off the filters, add 2C if ya leave em on.
-Alphacool rads rule Martins testing from 600 rpm on up.
-Koolance 380i won extreme systems COPU WB Roundup on LGA 2011
-EK owns the GPU WB crown, not so much for the GPU temps which it actually loses to XSPC by a degree or so, but for the VRMs where's iuts 12C below some of the competition. I recommend the clean blocks as they are an inch shorter than the acetal ones.
I'd put the 35x2 in there as the pump and run all three cards in parallel....should be able to maintain @ 0.75 gpm per GFX WB and 2.25 gpm thru the CPU. I have the 35x2 on PWM control from about 1.5 gpm (0.75 per block) up to 2.25 gpm at peak but it actually has never climbed that far except under manual control. See martins review of the 35x2.Edited by JackNaylorPE - 3/25/14 at 9:43pm