issue with Flow/head pressure, not able to bleed

[snef]

Hi I think I have an issue with "sand of god"

the flow is really low and seem to have a very low head pressure

my temp are correct
ambient temp 20c

idle
CPU 27C
GPU 25C

Full Load
CPU 57C (AIDA64 stability test)
GPU 45C (Unigine Valley)

the issue is im not able to bleed with this low flow/head pressure
little video to show you

I have 2 D5 Vario in serial, both set at 5

I have a choice, first, return to one Res (I think the issue is the second res)
or dual loop, one for CPU and ram and one for GPUs
don't forget, I will have 2 GPU

what do you think

[gdesmo]

Looked slow to me, first thing I would do is unplug one of the pumps and see if there is any difference. If not plug it back in and unplug the other one. Did you double check and make sure it set at 5 not 1. How do you have the pumps wired in ?(controller, Aquaro, pwm from board) Somehow doubt it is the reservoirs.

[DazMode]

Make sure pumps work, i'e no power supply issue . Sometimes after crimping things go not perfect.
Check that pump inlet outlet is right on both.
Tilt case to make sure no air pocket in radiator.
Cycle pumps to make sure no air pockets anywhere else.

[snef]

yes both pump works
they are connected directly to the power supply
just tested the cable with a PSU tester, check V with a multi-meter and they are OK

I know they are at 5 because both pump turn at 4800rpm and I turn down and turn back to 5

with the exact same setup but with my 2 7970
they are perfect, but the only difference is the inlet of res are coming from the side

look these pics


first is with my 2 7970 and inlet on res is on side and look the flow in res, pretty good

now I change for only one GPU but change the inlet to the front (red Circle)





and sure I have bubble, they are dancing (in Pink circle), I cant remove these, I put the case on all side multiple time and for more than 3 minutes each side
on the left, on the right, on the front, on the back, still missing only on top but lollll I cant

[bungwirez]

does it make a difference if you only use one rez?

prolly a little too soon to think that your coolant dye is precipitated out of solution and causing a clump to block flow?

[SeeThruHead]

What kind of plugs are you using to plug the opposite side of the GPU block. If the are too long, too much thread, they can screw in too far and stop flow. Since you've only changed the GPU's that's the first thing that comes to my mind.

[snef]

On one side is ek stop plug ( came with block)
And on the other is bitspower fittings
I will try the 2 mm spacer in ek box, good idea, thanks

[snef]

ok

did some test this morning

its not the fittings, I use EK stop plug, they are very very short and Bitspowers have 5mm thread, no interference with flow

I bypassed the GPU, same results very low flow, its not the GPU waterblock

I bypass CPU and Ram. same results very low flow, its not the CPU or Ram waterblock

the only think im not able to bypass is rad,
but I put my case on the back, front and both, (put rad inlet and outlet on top for 4 minutes), power cycle the pump maybe 40 times and same results, low flow

it can be only 2 things

1- I did something wrong and kill my pump, 2 years old pump, maybe one died before but in serial its hard to see

or

2- I have something in rad and this fill an outlet port but seriously, not sure about this one because if drain my loop, the coolant use the same path, including rad and it drain really really fast


I will buy 2 new pump

do I go with dual loop?


for sure stay with D5 (I have pump top)
PWM version , Vario or strong?

[Hooded]

Unplug power from one pump, then run
Switch the power to other pump and run.

Should allow you to see if it's only one not working, or both pumps not working properly.
Quad triple check power cables are working 100% try different cables for power.

[snef]

I put both pump on same molex (custom cable) and I know I have correct volt on cable because I tested it yesterday and my CCFL are on the same Molex cable

and I have only one cable with 3 Molex connector and I tried all 3 (one for CCLF, one for Feet leds and one for Pumps)

anyway I seriously think change D5 for DDC 3.1 in dual loop and put these under both res

like that I can put push and pull fan on rad and really easy to work on case
now its a pain in the ass to remove top from pedestal to see and work on pump

I use DDC 3.1 in a lot of rig (Icy blue angel, Purple Chimera and more) and never have any issue, all still work perfectly

but these after 2 years failed and one of my friends D5 died last week

[DazMode]

Look at my venom it has crazy amount stuff too. Even with one pump I have 1.9L/min, with two I have 3.0L/min. There has to be something restricting your flow.

[gdesmo]

No question ! Unfortunately access to the pedestal images is not so easy with tubing in the way. Most likely something to do with dual pump configuration or them working against each other. Hope this is fixed soon.More updates please.

[Hooded]

Hate to say it but tear down and retest.

You'll pretty much being doing that if getting new pumps

[snef]

I will dismantle the rig tomorow
And check, i will create a loop with only pump and res

And check rad

[bungwirez]

sorry man, this has suck written all over it... but the rest of us will get to watch you put her all back together again