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What radiators to get? Too many to chose

post #1 of 5
Thread Starter 
I'm planning on building my first water cooling pc.

Using a Corsair 900D
I7 4820k
and sli 780 ti hydrocopper (when it is released).

I've never water cooled before, but after some research, seeing the TDP adds up to around 640watts, then I want to overclock both the CPU and the GPU, so I'm guessing around 700w should be dissipated.

To be honest I'm not sure what combination of 480mm, 380mm, 240mm, etc radiators to use, but seeing that a 900D has a lot of space, I'm sure their are a lot of options.

What combinations of radiators should I use in my case? Will I need multiple pumps?
post #2 of 5
Quote:
Originally Posted by gbatemper View Post

I'm planning on building my first water cooling pc.

Using a Corsair 900D
I7 4820k
and sli 780 ti hydrocopper (when it is released).

I've never water cooled before, but after some research, seeing the TDP adds up to around 640watts, then I want to overclock both the CPU and the GPU, so I'm guessing around 700w should be dissipated.

To be honest I'm not sure what combination of 480mm, 380mm, 240mm, etc radiators to use, but seeing that a 900D has a lot of space, I'm sure their are a lot of options.

What combinations of radiators should I use in my case? Will I need multiple pumps?
A chip only puts out its full TDP rating when under load, so it's not necessary to match your radiator capacity to that number unless you plan on a heavy overclock and/or will be folding constantly or doing some other 24/7 heavy computing. The basic rule of thumb is to get one 120mm radiator's worth for each major chip (CPU or GPU) plus one additional 120mm, as a minimum. So for your list of one CPU and two GPU's would add up to one 480 (or two 240's, etc). It's just a guideline; you can always put in more more if you want, but going below that will start to impact the loop's performance.

One pump will be fine.
Blinky
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Blinky
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post #3 of 5
I got a 900D and will be overclocking a 4770k and dual AMD 290Xs. I got an XSPC AX480 in the top in push (might go push/pull if needed) and an Alphacool Monsta 480 in push in the bottom. Dual 480s (or even dual 360s) should be more than enough for your setup also. A single D5 or DDC should be enough as long as you don't have a lot of flow restriction.
post #4 of 5
Am I mistaken or arnt the hydrocopper blocks one of the more restrictive? You might be better served with a heatkiller or EK block.
post #5 of 5
640 watts seems ok for 'stock" but not overclocked........I'm at 800+ w/ twin 780s and 4770k

4820k is 130 watts @ stock .... 200 overclocked toi 4.5 GHz w/ 1.33 volts = 200 watts
780 Ti is 270 @ stock .... add 30% for OC ... = 350

I'm thinking 900 if ya really gonna push it.... but again....that's at max 'stress test load".

Let's take a shot at 420's top and bottom, in push / pull

At 1800 rpm, ya get 420 watts from a UT60-420 x 2 = 840 .... that would be 93% of ya max theoretical load
At 1400 rpm, ya get 346 watts from a UT60-420 x 2 = 692 .... that would be 77% of ya max theoretical load
At 1250 rpm, ya get 309 watts from a UT60-420 x 2 = 618 .... that would be 69% of ya max theoretical load

Considering that 1) ya almost never actually run the computer at 100% TDP and that everything in the box (fittings, tubes , res, radiator sides / shroud / MoBo, also radiates heat taking load off the rads.... any number above 60% I'd consider workable. If noise is an issue....1250 rpm fans will easily do the job and if ya concerned get PWM 1500 rpm which will be more than enough to handle everything ya can throw at it.
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911 Carrera
(20 items)
 
  
CPUMotherboardGraphicsRAM
Intel w/ EK Supremacy Cooling Block - Clean P... Asus Maximus VI Formula 2 x Asus GTX 780 DCII w/ EK Full Cover Blocks a... Mushkin Red Line Ridgeback 2 x 8GB DDR302400 10... 
Hard DriveHard DriveOptical DriveCooling
2 x SAMSUNG 840 Pro Series MZ-7PD256BW 2.5" 256GB (2 x Seagate ST2000DX001 2TB 7200 RPM 64MB Cach... Asus BW-12B1ST/BLK/G/AS Blue Ray Writer 1 x Alphacool NexXxoS XT45-420 + 1 x Alphacool ... 
CoolingCoolingCoolingCooling
1 x Swiftech 35x2 w/ Heatsink and NB Fan EK -MultiOption RES X3 250 White Acetal Reservoir 5 x PH-F140SP_BK_BLED + 5 x PH-F140SP_BK E22 Rigid 10/12 Acrylic Tubing and Bitspower Ma... 
CoolingOSMonitorKeyboard
2 x Reeven Six Eyes Fan Controller Windows 7 64 Bit Professional OEM ASUS VG248QE Black 23" 144 Hz Monitor Logitech G19s 920-004985 
PowerCaseMouseAudio
Seasonic X-1250 Phanteks Enthoo Primo Ultimate Chassis Asus RoG GX950 Laser Mouse  Logitech Z5500 
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