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[Official] AMD Radeon HD 7950/7970/7990 Owners Thread - Page 3446

post #34451 of 38704
Quote:
Originally Posted by wermad View Post

Anyone heard from Karlitos ???? Haven't seen him around lately and heard from him at all.

His new rig is on Hardforum.
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post #34452 of 38704
Quote:
Originally Posted by bigmac11 View Post

His new rig is on Hardforum.

Kewl thumb.gif, I'll drop by there smile.gif
post #34453 of 38704
Quote:
Originally Posted by wermad View Post

Kewl thumb.gif, I'll drop by there smile.gif

http://hardforum.com/showthread.php?t=1734019&highlight=
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post #34454 of 38704
Quote:
Originally Posted by Mega Man View Post

probably near the same, i helped my cpu temps when i had 2 by going from serial to parallel

great write up on serial vs parallel if you scroll down


also you may need to oc your ht ! ( maybe 3000 will be enough )

essentially with serial vs parallel, in series your water eventually heats up and will not accept much more heat until it gets cooled again, which with multiple GPUs this happens pretty easily, you could increase your water flow, but doing this you reach a point that the blocks don't allow water fast enough and also loose transfer efficiency. So a good solution is to separate your loop into parallel parts at some stage to split the flow and allow cool water to each area, eg; give the GPUs and your CPU and RAM their own smaller loops.

another option is to add radiators midway through the loop between devices, but then you have to be sure you have enough pump power to push the water through it all, so it depends really on your chassis and hardware as to how you want the loop to flow.
   
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Arctic Cooling 550R Gigabyte mATX 
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Intel Atom 230 some all-in-one Mini-ITX board Intel GMA 950 some 1GB stick 
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post #34455 of 38704
I've tested series vs parallel on a quad gtx 580 3gb setup and there was no temp difference smile.gif.

Parallel looks better though thumb.gif


Edit: loop order doesn't matter either. Tested this on a quad gtx 480 and x79 setup thumb.gif

double edit:

EK bridge you need:

http://www.performance-pcs.com/catalog/index.php?main_page=product_info&cPath=59_971_1018_1038_1207&products_id=37782




XSPC link system:

http://www.performance-pcs.com/catalog/index.php?main_page=product_info&cPath=59_971_1018_1255&products_id=38339




You'll need two links for parallel or one for series.


Or some sli links like BP:




http://www.performance-pcs.com/catalog/index.php?main_page=product_info&cPath=59_971_1018_1149&products_id=35775
Edited by wermad - 1/8/14 at 8:55pm
post #34456 of 38704
Quote:
Originally Posted by Paul17041993 View Post

essentially with serial vs parallel, in series your water eventually heats up and will not accept much more heat until it gets cooled again, which with multiple GPUs this happens pretty easily, you could increase your water flow, but doing this you reach a point that the blocks don't allow water fast enough and also loose transfer efficiency. So a good solution is to separate your loop into parallel parts at some stage to split the flow and allow cool water to each area, eg; give the GPUs and your CPU and RAM their own smaller loops.

another option is to add radiators midway through the loop between devices, but then you have to be sure you have enough pump power to push the water through it all, so it depends really on your chassis and hardware as to how you want the loop to flow.

if by multiple GPUs you mean 10+/thousands of watts, then yes. if by multiple you mean 2-4, then it's not really a factor. I happen to think the parallel flow water bridges look awesome, but I'd just as happily do a koolance serial setup as well. if you gave me the parts for free, I'd do either/both.
 
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post #34457 of 38704
Parallel lowers the water flow thru each block, you know reducing cooling potential. It's fine on rigs not pushed too hard. But in my case for how high my cards clock I want max cooling to each block. I've been running quad loops for a few years now and at this point I prefer better temps thru serial. If you have the pump power and high flow blocks, serial ftw.


Quote:
Originally Posted by Mega Man View Post

yes intels score higher !~

lol.... nevermind biggrin.gif
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post #34458 of 38704
Quote:
Originally Posted by tsm106 View Post

Parallel lowers the water flow thru each block, you know reducing cooling potential. It's fine on rigs not pushed too hard. But in my case for how high my cards clock I want max cooling to each block. I've been running quad loops for a few years now and at this point I prefer better temps thru serial. If you have the pump power and high flow blocks, serial ftw.
lol.... nevermind biggrin.gif

You're talking about fractions of a degree between both. You can push the clocks as high as you can (on water) and there's still negligible difference. I think DDC are suitable for both while D5s are better for parallel but tbh, either pump will work fine. Since water reaches an equilibrium, placement and flow path will have a minor difference. Been water cooling many, many, many, builds since 2009 and this is one of those myths that has been tested and there has been no decisive and conclusive evidence to support one is better then the other in terms of thermal performance. In your case since you're pushing to the breaking point, you may have something unique going on. Most average users don't push as high as you, so it would be irrelevant to throw in your unique scenario if you did achieve a difference (which I'd like to see this wink.gif).

If you want max cooling, its time to move on to exotic cooling imho. Water will take you so far and its just a waste of money trying to achieve marginal fractional gains in temps.

post #34459 of 38704
Quote:
If you want max cooling, its time to move on to exotic cooling imho. Water will take you so far and its just a waste of money trying to achieve marginal fractional gains in temps.

How long have my quads been at or near the tops on OCN benches? All those fractions add up, and it's the key to what separates you from other setups. And there is math behind it as you drop flow into the blocks by 75% iirc in quad parallel. You guys are not pushing hard enough to max that 25% flow you are getting thru your blocks individually.
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post #34460 of 38704
Quote:
Originally Posted by tsm106 View Post

How long have my quads been at or near the tops on OCN benches? All those fractions add up, and it's the key to what separates you from other setups. And there is math behind it as you drop flow into the blocks by 75% iirc in quad parallel. You guys are not pushing hard enough to max that 25% flow you are getting thru your blocks individually.

max cooling not max scores wink.gif. Time to put on the glass nerdsmiley.pngtongue.gifbiggrin.gif
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