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Loop Question

post #1 of 2
Thread Starter 
Hi everyone!

I'm planning on building my first Water Cooled rig, and I was hoping to run my plans by the professionals for some wisdom.

Here are the PC specs:
Intel Core i7-4770
2x EVGA GeForce GTX 780 Dual Classified Hydro Copper
Asus MAXIMUS VI FORMULA
Corsair Dominator Platinum 16GB (4 x 4GB)
Western Digital Caviar Black 1TB
Creative Labs Sound Blaster X-Fi Titanium HD
Corsair 900D
Corsair AX1200i

For cooling, I was planning on all XSPC gear, with two 480 rads and one 240 rad, all in push pull.
The rad fans would be 20x Corsair PWM Static High Performance 120mm's, running through 8 way PWM splitters.
The case fans would be the stock front 3x 120mm intakes and the rear 140mm exhaust.

The motherboard as well as the GPU's include stock waterblocks, and I plan on installing CPU and RAM waterblocks as well.
The pump I plan to use is the D5 Vario. 1/2" ID tubing throughout with chrome compression fittings.


From all the research I've done over the past two days, I'm fairly certain that I have that part down.
My main concerns are loop efficiency and air flow. As all 3 radiators will be intakes, as well as the front.
This is potentially justified given that the 4 primary essential components are water cooled.

However, as for loop efficiency, I am still confused.
I've noticed that most people have both GPU's cooling one after the other in the loop, and I figured that with 3 push pull rads I could place one in between in that loop.

The loop order I have so far is as follows:
Reservoir -> Pump -> Bottom 240mm Rad -> Secondary GPU -> Bottom 480 Rad -> Primary GPU -> Top 480 Rad -> CPU -> MOBO/MOSFETS -> RAM -> Reservoir

Here is an illustration of the loop:
(Excuse my terrible handwriting/drawing skills)


*typo; RAM not GPU.

This might be overkill, the tubing appears to be all over the place, however I can't help but feel like this maximizes efficiency of all 3 rads, focusing on GPU performance for gaming.

Any help/wisdom would be greatly appreciated and could help thousands of dollars worth of equipment live a better longer life tongue.gif

Thanks in advance,
Johnny
Edited by Johnnnny - 9/7/13 at 10:06am
post #2 of 2
By splitting up the loop and placing a radiator between the Gpu's like that, one of the Gpu's will get slightly cooler water than it would if both GPU's were connected in series. The difference is likely to be only 1C ... at the very most while benching or similar max heat output. With a flow rate of around 1 GPM, it takes about 250 watts of heating or cooling to change the water temp by 1C
If the flow rate of the system was much lower then placing rads between components would have more effect ... but radiator efficiency is also reduced with lower flow rates.

Water cooling systems normally work where the whole water volume increases in temperature til eventually it is enough degrees above ambient so that the wattage of heat being put in by components is matched by the wattage dissipated by the radiators. The changes in temp along the length of the loop are quite small. A radiator with water inside it 5C above ambient dissipates half the wattage as it does with water 10C above ambient.
If the very small difference in temp to one GPU is worth all the extra tubing to you then it will work fine.
Kusanagi
(21 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i5 3570K Asus Sabertooth Z77 EVGA GTX 780 SC Corsair Vengeance Pro CMY16GX3M2A2133C11 16GB 
Hard DriveCoolingCoolingCooling
Samsung 840 Pro 256GB X2 EK Supremacy Aqua Computer Aquaero 6 Pro Aqua Computer D5 USB 
CoolingCoolingCoolingCooling
Aquacomputer MPS 400 flow meter EK-CoolStream PE 360 EK-Coolstream PE 240 Noiseblocker Eloop B12-PS 
CoolingCoolingCoolingCooling
EK Vardar F2 EK-FC Titan Acetal & Nickel EK-RAM Monarch X4 Clean CSQ - Acetal+Nickel EK-D5 X-RES 140 CSQ 
OSMonitorMonitorPower
Win 8.1 Pro 64 bit Samsung S27A750d LG E2290V-SN Silverstone Strider Plus 850W ST85F-P 
Case
Corsair Obsidian 750D 
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Kusanagi
(21 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i5 3570K Asus Sabertooth Z77 EVGA GTX 780 SC Corsair Vengeance Pro CMY16GX3M2A2133C11 16GB 
Hard DriveCoolingCoolingCooling
Samsung 840 Pro 256GB X2 EK Supremacy Aqua Computer Aquaero 6 Pro Aqua Computer D5 USB 
CoolingCoolingCoolingCooling
Aquacomputer MPS 400 flow meter EK-CoolStream PE 360 EK-Coolstream PE 240 Noiseblocker Eloop B12-PS 
CoolingCoolingCoolingCooling
EK Vardar F2 EK-FC Titan Acetal & Nickel EK-RAM Monarch X4 Clean CSQ - Acetal+Nickel EK-D5 X-RES 140 CSQ 
OSMonitorMonitorPower
Win 8.1 Pro 64 bit Samsung S27A750d LG E2290V-SN Silverstone Strider Plus 850W ST85F-P 
Case
Corsair Obsidian 750D 
  hide details  
Reply
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