Watercooling SLI 980's

cs2000

cs2000

cs2000

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Joined
29 Aug 2012
Posts
200
Hey guys, have a few questionjs about an upcoming build, just wanted to check a few things.

The parts related to my question are listed below.

YOUR BASKET
1 x Asus X99-S - Intel Core i7 5820K Six Core CPU & Motherboard Bundle ***£30 Saving*** £505.98
2 x OcUK GeForce GTX 980 "Reference Design" 4096MB GDDR5 PCI-Express Graphics Card £425.99 (£851.98)
1 x Hardware Labs Black ICE Radiator GT Xtreme 480 £84.98
2 x EK Water Blocks EK-FC980 GTX - Acetal £79.99 (£159.98)
1 x Hardware Labs Black ICE Radiator GT Xtreme 240 £56.99
1 x PrimoChill 240mm AGB CTR System Phase II - Clear £54.95
1 x Aqua Computer Cuplex Kryos PRO - Socket 2011 £49.99
1 x PrimoChill Revolver Compression Fitting Acrylic Tube 13/10mm Diamond 10-Pack - white £49.99
2 x EK Water Blocks EK-FC980 GTX Backplate - Black £22.99 (£45.98)
1 x Mayhems Pastel - UV White Coolant 1L £17.99
5 x PrimoChill 13/10mm Acrylic Tube 90cm - Clear £5.99 (£29.95)
Total : £1,923.76 (includes shipping : £12.50).




I have seen these bridge things about like these http://www.overclockers.co.uk/productlist.php?groupid=962&catid=1529&subid=2267 but don't know if I need one?? If I do, could somebody suggest one that's compatible with the cards/motherboard/compression fittings I have chosen?

Secondly. In my current build I have twin loops, one CPU one GPU, these are powered by two EK DCP 4.0 pumps. In the new build I will be dropping to a single loop. Is it advisable/necessary to still use two pumps with the loop setup and components I have?

Lastly, I assume those two rads will be enough to cool two 980's and the CPU I have chosen? I wont be doing push pull, will be one rad push and the other rad pull so airflow goes from left to right through the case (Corsair Obsidian 900D)
 
You could use 2x PWM Laing DDC's and run them at reduced speed, that would give you monster liquid pushing power and quietness.

HwLab radiators are one of the most restrictive radiator designs on the market.

I'm cooling a 5Ghz 3770k and GTX970 SLI with a HWlabs GTX 360 extreme with fans in push/pull and a HWLabs X-Flow radiator with a single set of fans in push.

My fans are run at 4.7v and my system is silent, temps are great too!
 
I think you may need more than 1L of coolant for such a large loop. I used >800 mL for a single loop GPU+CPU on a thin 360 rad and only a 150mL reservoir.

You could get away with a single pump depending on the model, but dual pumps might run quieter and more efficiently since one pump doesn't have to cope too much with the back pressure from the radiators.

Personally, I would have the radiators only in a push configuration and use fans at the front to draw in cool air. With a 900d you have top and bottom mounting options to accommodate the 480 and 240 rad.

You might get away with a single 480 cooling two GPUs, I get away with 30C on a HD5970 (two cores) with a 360mm rad - but I'll let someone better qualified answer this.
 
Cheers mate, il add that into the basket.

Is the restrictiveness of the HW Labs rtads a bad thing then? I assume its because it has more passes through the rad fins which means it cools better? Im not against using both pumps, I just didn't know if it was necessary :)

Will add a second litre of fluid as well then, thanks :)

I don't really want to have to change the pumps unless I really have too. They seem pretty decent to me but again, I could be wrong!

Lets say I do go with both pumps. Whats the ideal route then. Using two is new to me and I guess going" Rad 1 > Rad 2 > Pump 1 > Pump 2 > CPU > GPU 1 > GPU 2" probably isn't the best idea! Maybe "Rad1 > Pump1 >CPU > Rad2 > Pump 2 > GPU 1 > GPO 2", but that would call for some interesting routing!

Was going to mount both rads in the base of the case, I don't personally like the look of them, its the tubing that does it for me so was trying to hide them :)
 
Loop order is irrelevant, just go with what makes filling/draining easiest and looks neatest, having the pumps in the same place is fine

Dcp 4.0 pumps are great, i run 2 myself
 
cs2000 said:
Is the restrictiveness of the HW Labs rtads a bad thing then? I assume its because it has more passes through the rad fins which means it cools better? Im not against using both pumps, I just didn't know if it was necessary :)
Click to expand...

I've just put a flow sensor in my system and I'm only pushing 0.8 Gallons per minute, the magic number is 1 gallon per minute or higher so I'm below that.

I'm changing my DDC's out now for some Laing D5's, DDC's are very strong pumps and if they can't push high enough flow rate then not a lot of pumps will.

That little DCP4.0 would have no chance on my loop.
 
Fair enough, il take a look at them then. Maybe its just my inexperience, this is only my 3rd custom loop, and ive previously only used EK DCP 2.0's but the 4.0's look huge to me!
 
almighty15 said:
I've just put a flow sensor in my system and I'm only pushing 0.8 Gallons per minute, the magic number is 1 gallon per minute or higher so I'm below that.

I'm changing my DDC's out now for some Laing D5's, DDC's are very strong pumps and if they can't push high enough flow rate then not a lot of pumps will.

That little DCP4.0 would have no chance on my loop.
Click to expand...

Jesus, What is your loop?

Mines a 1280 rad, cpu and 3 gpu's and the ek dcp4.0's cope fine in series, cpu temps 60c and gpu's 40c
Flow rate is actually not that critical if temps are fine, aim for 1gpm but you get no real benefit from being higher
 
andybird123 said:
Jesus, What is your loop?

Mines a 1280 rad, cpu and 3 gpu's and the ek dcp4.0's cope fine in series, cpu temps 60c and gpu's 40c
Flow rate is actually not that critical if temps are fine, aim for 1gpm but you get no real benefit from being higher
Click to expand...

EK Supremacy EVO
2x EKGTX970 Full cover blocks
HW Labs GTX 360 Extreme
HW Labs 360 X-Flow
18w Laing DDC
Bitpowers Micro Tank
Aquacomputer Aquaero High Flow Sensor

HW Labs radiators are some of if not the most restrictive radiators available.
 
Your pump has a head of 4.7m, 2x DCP4.0 will be 8m, 2 DCP4.0's would be a big upgrade over what you have, he OP should stick with his current pumps and put them in series
 
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