Possible Pump Problem

[Chris0007]

Hi, 
I just built a water cooled system in a Phanteks Enthoo Primo with these parts:https://www.pccasegear.com/wish_lists/619825/PC%20Upgrade%204-Done

+ EK's GTX 1080 FTW Water Block and Backplate. 
The CPU is the last in the loop and I am getting rather high temperates, the max I've experienced is 84 degrees, the CPU is a i7-4790k turbo boosting to 4.4GHz. At idle its around 45 degrees (ambient temperature is 24 degrees and my GPU is at 33 degrees idle, 45 degrees at load. After the CPU the water goes back into the reservoir, the water coming back in is a bit more than a trickle. Is it possible the reason for my high CPU temperatures is the D5 pump isn't powerful enough? What do you suggest?

[weberdarren97]

Three radiators and two blocks in a single loop? A D5 pump is not going to respond well to that config. If the GPU block was just a basic block, it might be a little more happy, but you've got the full cover block (cools more than just the GPU die) which has more channels and bends in it that the coolant has to flow through.

 

You could either switch out the D5 for a DDC model, or add a second D5 pump.

[tarfeef101]

13 minutes ago, Chris0007 said:

Hi, 
I just built a water cooled system in a Phanteks Enthoo Primo with these parts:https://www.pccasegear.com/wish_lists/619825/PC%20Upgrade%204-Done

+ EK's GTX 1080 FTW Water Block and Backplate. 
The CPU is the last in the loop and I am getting rather high temperates, the max I've experienced is 84 degrees, the CPU is a i7-4790k turbo boosting to 4.4GHz. At idle its around 45 degrees (ambient temperature is 24 degrees and my GPU is at 33 degrees idle, 45 degrees at load. After the CPU the water goes back into the reservoir, the water coming back in is a bit more than a trickle. Is it possible the reason for my high CPU temperatures is the D5 pump isn't powerful enough? What do you suggest?

I doubt it's the pump, I keep mine on speed 1 in a more restrictive case (with SLI, although 1 less rad). I'd say the CPU could be going that high by itself (mine can go all the way up to 90 if I run it at 4.9 GHz), but at 4.4 GHz I doubt it. I'd be suspicious of the cleanliness of the block, the mount it has on the CPU, the voltage if you accidentally cranked it higher than intended.

 

Of course, now having read your entire thing and seeing you said it is just over a trickle going into the res it could be a couple things:

1. The pump speed is too low (yours should be controllable, and if I'm not mistaken on the bottom of the pump itself)
2. There could be an obstruction somewhere in your loop (clogged block, rad, etc)
3. The pump could be damaged (check the RPM readout in the BIOS to make sure it isn't super low)

The issue is likely to be your CPU block though, as the GPUs aren't being affected (apparently). I'd try remounting it, cleaning, etc. Although try the easy stuff like checking the pump first since that doesn't require disassembly.

[tarfeef101]

2 minutes ago, weberdarren97 said:

Three radiators and two blocks in a single loop? A D5 pump is not going to respond well to that config. If the GPU block was just a basic block, it might be a little more happy, but you've got the full cover block (cools more than just the GPU die) which has more channels and bends in it that the coolant has to flow through.

 

You could either switch out the D5 for a DDC model, or add a second D5 pump.

It should be fine, I have SLI full cover GPU blocks, a CPU block, 2 rads, and a separate pump and res. Plus a lot of 90 degree bends because my loop is hardline. The pump is at speed 1 and the flow is quite adequate. Unless there's a ridiculous amount of sharp turns, it should be able to handle it.

[Chris0007]

2 minutes ago, tarfeef101 said:

I doubt it's the pump, I keep mine on speed 1 in a more restrictive case (with SLI, although 1 less rad). I'd say the CPU could be going that high by itself (mine can go all the way up to 90 if I run it at 4.9 GHz), but at 4.4 GHz I doubt it. I'd be suspicious of the cleanliness of the block, the mount it has on the CPU, the voltage if you accidentally cranked it higher than intended.

 

Of course, now having read your entire thing and seeing you said it is just over a trickle going into the res it could be a couple things:

1. The pump speed is too low (yours should be controllable, and if I'm not mistaken on the bottom of the pump itself)
2. There could be an obstruction somewhere in your loop (clogged block, rad, etc)
3. The pump could be damaged (check the RPM readout in the BIOS to make sure it isn't super low)

The issue is likely to be your CPU block though, as the GPUs aren't being affected (apparently). I'd try remounting it, cleaning, etc. Although try the easy stuff like checking the pump first since that doesn't require disassembly.

The pump speed is level 5 (the highest, verified on MB BIOS and CAM)

There shouldn't be any obstructions all the components are brand new

[Chris0007]

5 minutes ago, weberdarren97 said:

Three radiators and two blocks in a single loop? A D5 pump is not going to respond well to that config. If the GPU block was just a basic block, it might be a little more happy, but you've got the full cover block (cools more than just the GPU die) which has more channels and bends in it that the coolant has to flow through.

 

You could either switch out the D5 for a DDC model, or add a second D5 pump.

So you believe a DDC pump with more head pressure would fix the problem? I think you might be right as there are a few small bubbles in the top of the CPU block, I don't think its getting much pressure after all the other components

[tarfeef101]

1 minute ago, Chris0007 said:

The pump speed is level 5 (the highest, verified on MB BIOS and CAM)

There shouldn't be any obstructions all the components are brand new

Well, EK DOES clean out their radiators before shipping them, and generally they are pretty good about it. But, it is possible they messed up on one of yours, and that residue could have settled in your loop. That's a very unlikely case, but it is possible. Oh yeah and I forgot because I assumed you did, but pls tell me you bled the loop properly, and there isn't a bubble or something in the CPU block, because that would explain the temps.

 

But yeah, I'd remount the CPU block, and if the flow is really a trickle, you can either clean everything to ensure there's no blockage, or get another pump. Given how fast my flow is on speed 1 with an extra block, I don't see why your flow should be so low, but I haven't seen your loop so it is possible that's just how restrictive it is.

[Chris0007]

4 minutes ago, tarfeef101 said:

Well, EK DOES clean out their radiators before shipping them, and generally they are pretty good about it. But, it is possible they messed up on one of yours, and that residue could have settled in your loop. That's a very unlikely case, but it is possible. Oh yeah and I forgot because I assumed you did, but pls tell me you bled the loop properly, and there isn't a bubble or something in the CPU block, because that would explain the temps.

 

But yeah, I'd remount the CPU block, and if the flow is really a trickle, you can either clean everything to ensure there's no blockage, or get another pump. Given how fast my flow is on speed 1 with an extra block, I don't see why your flow should be so low, but I haven't seen your loop so it is possible that's just how restrictive it is.

Here are some pics of it, there are a few tight turns such as from the reservoir to the pump.

[Chris0007]

What do you guys think?

[tarfeef101]

Looks pretty decent, and not very restrictive tbh

[AnonymousGuy]

Take the CPU block apart and look for obstructions.  That loop is no where near restrictive by its appearance.