EK DCP 4.0 vs Laing D5

somewhatdamaged · 29 Sep 2014 at 10:15

I'm wondering if the flow rate in my loop isn't up to scratch. The water is trickling into my reservoir, and my CPU temps are higher than i would like

Is the EK pump any good, or is a CPU, GPU and 2 large radiators a bit much for it?

I've never used the Laing but heard it's very good, so i'm tempted to switch to it

This is the flow rate on the current setup - does this look normal?

https://www.dropbox.com/s/0kbv7rnsoec5fip/2014-09-27 20.38.50.mp4?dl=0

west1980 · 29 Sep 2014 at 11:25

link isn't working

somewhatdamaged · 29 Sep 2014 at 11:31

Sorry try again :-)

pete910 · 29 Sep 2014 at 11:56

The dcp 4 should be fine, have one my self . Don't have mine running flat out neither, that's doing CPU/GPU + 2 360's

Toyed with the idea of going to a d5 purely for quietness in my build but from what i gather there's not much difference in pump noise. I believe the D5 has less head pressure too compared to the dcp4.

Whats your PC spec?
WC setup spec?
Temps?

Edit:

Looking at the vid its hard to judge tbh . Do you run yours at the full 12v?

somewhatdamaged · 29 Sep 2014 at 12:31

Specs below

4960x @ 4.6Ghz (1.35v)
Asus Rampage IV Extreme (BIOS 4901)
360mm Alphacool Monsta Radiator
480mm EK Water Blocks EK-CoolStream PE Radiator
Scythe Gentle Typhoon AP-15s on all rads
Corsair 900D
Radeon 295X2 Full XSPC Waterblock
EK 4.0 Pump
250mm Tube Res
EK Supreme HF Waterblock (it was a faff to get this mounted on my board but i think it is mounted correctly)

Running Asus RealBench my CPU is hitting 75+ degrees, that seems much higher than i expected for what i am assuming is a decent watercooling setup

GPU hits 53 degrees on furmark, which seems good

I reset CPU to stock frequency and then ran Prime95 and furmark together for 30 mins to see what kind of temps my watercooling loop could handle, and CPU was hitting 78 degrees (stock @4Ghz) and both GPU cores were hitting 55 degrees

Is this expected? The CPU doesn't seem to be cooling very well, yet the GPU seems OK

Radiators get hot to touch when both CPU and GPU are maxed out (you want to feel the 295X2 though, SO hot you can't even touch it)

I've connected the 3 pin out on the pump to a molex, which i am assuming gives it the full 12v

Stock CPU (4Ghz) running OCCT Linpack (no GPU adding temp to loop) CPU hits 75 degrees using Realtemp (auto voltage @ 1.23v)

This seems higher than most peoples?

Panos · 29 Sep 2014 at 13:15

What is your loop configuration?

Also consider that the Typhoons do not have much static pressure. Barely scraping the 1.6mm H2O mark.

You need them in Push-Pull configuration to work properly, like the Enermax Magmas.

Or else you need some high static pressure ones like Vipers or Piranhas or Apache (for less noise).

Also do you blow cold air on the rads? Because is tad pointless to blow warm air on them.

somewhatdamaged · 29 Sep 2014 at 13:19

Are you sure?

i thought that it was widely agreed that Scythe Gentle Typhoon AP-15s are the single best radiator fans you can buy? Other than going for silly deltas etc. Of course happy to be proven wrong!

Loop goes reservoir, pump, 480, GPU, 360, CPU

Fans are all on push, but there is little to no hot air in the case.

http://forums.overclockers.co.uk/showthread.php?t=18335903

vsg28 · 29 Sep 2014 at 15:40

Nah, the AP-15s are excellent for actual work. Don't fall into the trap of marketing specs.

malcolm · 29 Sep 2014 at 18:12

Is this a new loop? Seems to me you may have an air-lock.

faxfan · 29 Sep 2014 at 18:17

gpu is good, cpu isn't - everything look ok with the 360 rad? dust, fans etc.

somewhatdamaged · 29 Sep 2014 at 18:29

Yeah all seems fine, i've just taken the CPU block off, re timmed and re seated. Same temps

I guess it could well be an air lock

When i switch the pc off, the tube from the res to the CPU out clears of liquid, which i guess could be air filling it?

pete910 · 29 Sep 2014 at 18:38

Cant see it been a pump prob the fact the 295X2 is running good temps !

Have you inspected the inside of the CPU block? Blocked fins and what not.

Are you 100% sure that the cpu block is mounting correctly on the cpu?

Can you take a pic of the entire loop/Case?

Jokester · 29 Sep 2014 at 18:43

If you see any big changes in level in your res when you turn your pump off, it means you've got a lot of air somewhere.

somewhatdamaged · 29 Sep 2014 at 18:44

Yeha i do see a big change in the res level when it's off, must be trapped air inside

Will this make a big difference in temps?

somewhatdamaged · 29 Sep 2014 at 18:50

OK, here is a pic withe pump running

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And here it is with the PC off, can you see the res level has gone up, and the tube from CPU to reservoir is full of air? Is this normal or should it always contain liquid?

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Not sure how i am going to bleed it!!

Jokester · 29 Sep 2014 at 18:53

Do you have like a dip pipe coming in from the top of the res to stop air going back up the tube when the pump is off?

pete910 · 29 Sep 2014 at 18:54

I can see the air in it, Thats the problem I think. when its off its draining back thus causing a air lock all the time.

Can you feed the return to the bottom of the rez?

Edit
If you look at the top pic as its running you can see air trapped Jokester

somewhatdamaged · 29 Sep 2014 at 18:58

I will drain the loop and then put the return into the base of the reservoir, it was just easier having it go in to the top. Perhaps this is the problem though

Still, does this explain the poor CPU temps, when the GPU temps are decent?

Jokester · 29 Sep 2014 at 18:59

GPU blocks aren't so sensitive to flow issues as they're just very simple flow channels.

somewhatdamaged · 29 Sep 2014 at 19:01

OK thanks Jokester, ill try and drain the loop tomorrow. SQL exam in the morning so won't be doing it tonight :-(