Hey !
i just finish instal my new 1080 ti a day ago 
 
however i have notice that i have a relay bad water flow trough the loop to the point were i have relay high temp both cards are hitting 80 degree under full laud and my cpu is 10 degree higher that normal on idle .
i have set the pump at max it sightly improve the flow but still pretty bad  bother card are still at 60 65 degre  
and i got the feeling that if i keep this up i will end up killing my pump it is like if something is blocking the water somewhere in the loop it is realy bad
 
note that my 980 on the exact same loop same pump same radiator nearly the exact same tubing route were never going higher that 50 degree .
 
cold it be that my pump is actually dying ?
those new water block have a lees good flow that the older one made by EK ? even so i have ek d5 pump i should be more that enough for this loop
cold it be a defect water block  ?
 
maybe it is how i set my tubes on the water block terminal that can cause this bad flow
here  is how i set them  http://imgur.com/a/vrDVd http://imgur.com/a/W9byA 
 
i was thinking to set it like this guy do will it help  ? http://i64.tinypic.com/wtjfpf.jpg
 
any help ideals will be very appreciate and sorry for my bad English i am going to work  so i am gonna chek this only post tomorrow 

Cool GTX
Did you flush the old loop and new parts before assembly ?
 
Could it be air trapped in your loop ?
 
How long did you run it for leak testing ?
 
What is your room temp ?
 
Fan speeds ?
 
 

Yep i flush the entire system system  and clean up every parts whit distill water 
 
i let the leak test run for around 12 hours and my fan speed are 1400 rpm fans
my room  in in the basement and is AC so is kinda cold .
 
but i can be air bubbles that is trap in one of the gpu block i try to move the case around but no aire came out .
 
 

Rotate your Computer 360 or even upside down to clear them out.
Tap of your Tubes to help move the Small Air Bubbles out of the Block.
Do you have a Flow Meter in your Loop?
Is the Pump set to 5?
What RPM is the Pump running?
A Pain but did you do a Flow test before you installed the cards?

I have NEVER had a Flow Issue with the EVGA Hydro Copper Water Block and I have had a lot of them from the GTX 690 680 780 980 and 1080.
The OP should complete a Flow Test on Each Water Block to Confirm that the Hydro Copper Water Block is the Cause or not.

Looking forward to your results when you get your new cards/ flow test results

I am gonna start dismantle my lopp now and and test flow  the cards wanna be donne whit this asap
 
@ bcavnaugh  I have that model https://www.evga.com/products/product.aspx?pn=11G-P4-6399-KR
 
let's hope that only one of the cards is blocking not both !

ok so i am a complete idiot  !!
 
Dismantle the loop flow test both card  everything is fine then i test them in sli and it was fine too
 
at this point i was like wth
 
it is when is dismantle the cpu  water block (Ek supremacy evo) that i fond out that when i have clean it i have assemble it the wrong way  and it was blocking the fluid  now it is working like a charm.
 
 just finish bleeding and now i am doing a leak test and the fluid is flowing perfectly 
 
Very happy that is not the gpu 

So in the end it was flow restriction, but not from the card.
 
Glad you solved this conundrum.  One of the things I don't like about EK Supremacy blocks. You can put it wrong by mistake, while Bitspower approach with Summit model is completely foolproof. No matter what you do, can't put it wrong. 

bcavnaugh
Why is it nice to have an in and a out Marker
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EK blocks have an in/out marker.. they also have a flow path insert that can be placed backward, lol.

You technically can not put the insert in backward, because it doesn't fully seat, but it looks close. You can tell when it is the correct way, because it won't "wiggle"... backwards, it wiggled just a little and doesn't lock in place.



Glad you got it all figured out.