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Corsair Obsidian 800D water cooling build questions.

post #1 of 5
Thread Starter 
Hey

I know this has been asked a guzilion times but here I am asking it again.
All my previous rigs were air cooled and in 2010 I wanted to make my first water cooled PC but didn't have the cash so I dumped the project. A week ago I bought a used 800D, that is pretty much brand new and now I want to put water cooling in it.

I've done a bit of research about it and came up with a setup that I'd like to show below and ask a few questions about it.

My spec atm are:

CPU: I7-2600k
MOBO: GA-P67A-UD5-B3
RAM: 16GB Corsair Vengeance
GPU: Sapphire HD6950 2GB
SSD: OCZ Vertex 3 120GB
PSU: 850W Antec Quattro

The 2600k has been OCed but put to stock 'cause I preffered lower rpm and less noise.
With WC the 2600k will get a decent OC.
The 6950 has been successfully flashed to 6970.
I will be buying another 6950 so I will be running CFX 6950's flashed to 6970.
The Vengeance is cooled by Corsair Airflow.

The 2600k OC is about 150W?
The 6950 is about 250W (500W)
Mobo is ?? watts.

Lets say max 700W needs to be cooled.
360mm rad at medium fan speed dumps like 500-600W
120mm rad at medium fan speed dumps like 150-200W
140mm rad at medium fan speed dumps like 150-200W
Total: 800-1000W cooling power?

I'm leaning toward the single loop more than the dual loop.
Here is the picture of first version:

vodno.jpg

The loop goes:
Hottest water goes from 2nd gpu -> 140 rad -> res -> 360 rad -> 140 rad (at this point water would be coolest) -> mobo -> cpu -> 1st gpu -> 2nd gpu -> repeat...

I realized that hottest water from gpu going to 140mm rad on bottom, will dump the heat in air, so the warm air will go over the RAM's and through the 360mm so that is a no go.
After more research I realized that I can't fit a 140mm rad on the back, since the 140mm fan is snug so I switched to 120mm rad in the rear (still debating over push/pull slimmer rad or just pull and thicker rad).
And after some more thinking I noticed that the bottom 140mm setup won't work either. There is 130mm room but the rail that PSU sits on blocks it a little so 25+80+25 wont work. Switched that rad to 140mm 60mm thickness in push/pull.

So here is the new version:

vodno4koncno.png

The loop goes (i drew it here):
Hottest water from 2nd gpu ->360 rad (to dump the heat asap) -> res -> 140 bottom rad -> 120 rear rad -> NB/SB -> mosfets -> cpu -> gpu 1 -> gpu 2 -> 360 rad -> repeat...

It's a bit complicated but looks good.
There is a drain port at the back of the bottom 140 rad, and the fillport is at the res.

Parts list:

1x Sapphire HD6950

1x 360mm radiator (debating here over 80mm Monsta in pull configuration (i've read that pull is better than push) or a 64mm EK XTX in push/pull configuration) but I am leaning more towards EKWB since I'm from Slovenia and so are they and they are basicly across the street.

1x 120mm radiator EK XTX 64mm
1x 140mm radiator (one that has a drain port (the XTX 120mm has it but XTC 140mm doesnt ) so UT60 60mm)
1x CPU block (prolly EK (I have no idea about the diffrence in supreme ltx and supremacy))
1x MOBO block EK-FB Kit GA P67A-UD7 (compatible with my UD5).
2x GPU block full cover EK-FC6970 (compatible with my HD6950).
2x D5 pumps that fit koolance res pump combo (this depends if I need two pumps for my loop)
1x Koolance reservoir dual loop pump combo (this depends if I need two pumps for my loop)
1x Flow meter
1x Water temp meter with LCD's
1x Drain valve
1x 140mm fan

All the tubing I'd like blue transparent (1/2''?)
All the fittings I'd like compression ones, will need a few angled ones thinking of Bitspower.
Liquid, either I'll get EK-Ekoolant or Deionized water at work and add stuff like biocides to it.
The only thing I'm scared about is the corrosion of the nickel, brass, cooper and aluminium.
Kill coil (silver coil) and PT nuke (cu biocide) will be included.

Stuff that I have:
Corsair Airflow for RAM's
A bunch (8) of Xigmatek XLF-F1256 from EKWB.


I hope I covered everything and if I missed anything or something should be changed or is wrong please tell me.
Any additional info I get from you guys and girls would be very usefull.
post #2 of 5
Don't worry too much about parts order in the loop. Just make sure the res is before the pump and it as the lowest point of the loop for easy priming. Overall system temp won't vary materially when it hits steady state, which is generally 5-10mins into the run.

I would just make sure the loop or is clean to minimize clutter.
 
Up to no good
(13 items)
 
CPUMotherboardGraphicsRAM
4770K @ 4.7ghz @1.4v (delidded) Asus Maximus VI Hero EVGA GTX 1080 @ 2150MHz Corsair Dominator Platinums 2133 cl9 1.5v 
Hard DriveCoolingOSMonitor
Plextor M5P Extreme SSD 128gb x 2 in Raid0 Corsair H105 Windows 8 Pro DELL ULTRASHARP U3415W 21:9 Curved Ultra Widesc... 
KeyboardPowerCaseMouse
Logitech 710+ Corsair AX1200i Corsair 760T Func MS-2 
CPUMotherboardGraphicsRAM
i7 920 D0 @ 4.2 1.3v Asus Rampage II Extreme EVGA GTX 690 6gb Corsair Dominator 7-7-7-20 
Hard DriveMonitorKeyboardPower
Crucial M4 256GB 3x Dell 2405 - Eyefinity Logitech G710+ Enermax Revolution 1050W 
CaseMouseMouse Pad
Silverstone FT02 Corsair M60 Razer Destructor 
  hide details  
Reply
 
Up to no good
(13 items)
 
CPUMotherboardGraphicsRAM
4770K @ 4.7ghz @1.4v (delidded) Asus Maximus VI Hero EVGA GTX 1080 @ 2150MHz Corsair Dominator Platinums 2133 cl9 1.5v 
Hard DriveCoolingOSMonitor
Plextor M5P Extreme SSD 128gb x 2 in Raid0 Corsair H105 Windows 8 Pro DELL ULTRASHARP U3415W 21:9 Curved Ultra Widesc... 
KeyboardPowerCaseMouse
Logitech 710+ Corsair AX1200i Corsair 760T Func MS-2 
CPUMotherboardGraphicsRAM
i7 920 D0 @ 4.2 1.3v Asus Rampage II Extreme EVGA GTX 690 6gb Corsair Dominator 7-7-7-20 
Hard DriveMonitorKeyboardPower
Crucial M4 256GB 3x Dell 2405 - Eyefinity Logitech G710+ Enermax Revolution 1050W 
CaseMouseMouse Pad
Silverstone FT02 Corsair M60 Razer Destructor 
  hide details  
Reply
post #3 of 5
Thread Starter 
Alright, Thanks
post #4 of 5
Stick with 60mm thick with dual fans.

Loop should be shortest to minimize tubing, which I think is:

Res
Mosfet
CPU
Southbridge
GPUs
Bottom Rad
Left Rad
Top Rad
Res

The bottom 140 rad won't have a drain port unless you can fit a t-fitting right before it enters the radiator.

Everything else is fine.
post #5 of 5
Thread Starter 
Alright...

With the help of this forum and others, we got up to this:

-Motherboard water cooling is near to useless, so ditched that to save money.
-Ditch one of the D5 pumps as one is enough for my loop.
-Cheaper reservior that is pump ready.
-Ditch flow meter and temperature meter with LCD's.
-Loop order doesn't matter, keep it as simple as possible.

Still debating over thick radiator with pull or normal radiator with push/pull. I'm leaning towards push/pull.
Still worried about the corrosion. I'll get to that later.

There are more than 3 options to be considered now, but I'll do 3 diffrent ones with push/pull.
1st:


2nd:


3rd:


About corosion:
I've been reading these few threads and there is allot of diffrent opinions, what do you guys think?
http://forums.overclockers.com.au/showthread.php?t=900452
http://www.overclockers.com/forums/showthread.php?t=717317
http://www.xtremesystems.org/forums/showthread.php?245952-Nickel-Plated-or-Plain-Copper-Waterblocks
http://www.overclock.net/t/1259719/noob-at-water-cooling-electroless-nickel-plated-vs-copper
http://www.overclock.net/t/1199118/ek-copper-vs-nickel-what-are-advantages-disadvantages
http://www.overclock.net/t/851501/copper-or-nickel-water-blocks-new-questions-edit
http://forum.overclock3d.net/showthread.php?t=44642
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