Temperatures difference with LC SLI

[uMILOny]

Hi Everyone. 

 

First Question

 

I built Gtx 1080 Ti SLI set with EK blocks and there is a problem with temps. Here you have photo how cards are connected:

 

http://imgur.com/a/vuX9K

 

 

For now one card is about 13C hotter then other. Dont know why. I think that is connected in the right way. Can you tell me why there is that big temperature difference beetwen cards ?

 

Second Question

 

Today i found something looks like brown spots inside one of the block. What is that and should i'll be worry about that ? Block have only five days.

 

http://imgur.com/a/h5wob

 

 

Thank you for replying and sorry for my english.

 

 

[Skiiwee29]

so silly question... you do have SLI enabled right?

[uMILOny]

Ofcourse  Perhaps its not important in this case but i use Mayhems Pastel

[DildorTheDecent]

16 minutes ago, uMILOny said:

Ofcourse  Perhaps its not important in this case but i use Mayhems Pastel

What's the flow path? As in where does the coolant go after the pump? 

[Mick Naughty]

Bled properly I assume. Do the blocks have flow specific ports?

[uMILOny]

1 hour ago, DildorTheDecent said:

What's the flow path? As in where does the coolant go after the pump? 

Pump OUT --> Graphic processor of first card

Pump in --> Heatsink

1 hour ago, Mick Naughty said:

Bled properly I assume. Do the blocks have flow specific ports?

Dont have flow in/out marked [This is Titan X Pascal water block ( EK )] so i I connected that the water was inlet to the graphics card processor. 

 

Guys what you think about that brown spots ? Is this normal ?

[DildorTheDecent]

19 minutes ago, uMILOny said:

Pump OUT --> Graphic processor of first card

Pump in --> Heatsink

Have no idea what you're trying to show. That "flow diagram" doesn't make sense. Sounds like the coolant doesn't even touch the radiator in the first place. 

 

For instance I've mine like this: pump/res > radiator > GPU > 1 GPU 2 > CPU and back to res (parallel flow). Think of it like a block diagram. 

 

Brown spots I've no idea on. Didn't notice them on my cards. 

[dexT]

Only use one tube between GPUs. What rad and fans?

[uMILOny]

Water from radiator flows to pump. Than from pump/res goes to gpu1>gpu2 . From gpu2 goes to radiator and cooled water back again to pump/res. Anyway still dont know why temp difference is so big. Even if it is bad flow path - temps should be high in both cards but its ok. For example 45C-47C in stress (hotter gpu)

 

28 minutes ago, dexT said:

Only use one tube between GPUs. What rad and fans?

 

Rad EK Coolstream PE 480 with 4 Thermaltake riings 120

[Mick Naughty]

Should be close no matter how its ran, Ive ran 2 gpus and a cpu in parallel and it was still the same kinda separation of 2-4c.

 

In the benchmark, both gpus were at 99% usage right? Valley or heaven?

[KWelz]

This will sound really stupid.  But are you sure you put thermal paste on both cards?   I had the exact same problem last year.  Posted on here about it.  And when finally listened to the people telling me to check that I found I had completely forgotten Thermal paste on one card. 

[uMILOny]

I have an Official  answer form EK about Brown Spots in Water blocks

 

Quote

That is nothing you should worry about. This is just grease from the oring and screws which must be greased a bit to make them more durable and safer to use. You don't have to worry about this as it has absolutely no effect on performance of the water block

 

Also I already know the cause of the difference in temperature on the cards  One sensor is a lier ! I did a pyrometer measurement and the real temperature difference is about 1 degree