CPU Pump in Apogee Drive II is not strong enough. Any suggestions?

zk2004mb

Trash Compacter
Original poster
May 23, 2020
38
10
Hi folks! I finally finished my triple rad NR200 build. But one DDC pump seems not strong enough to drive my loop.

Here are the components:
1x Black Ice 280GTS rad
2x XSPC TX240 rad
17x 90 degree fittings (I know it's kinda crazy.....)
1x quick release plug(pretty restrictive)
1x Apogee Drive II (CPU block + Integrated Swiftech MCP35X DDC pump, 18W)
1x GPU block

So I end up with a really weak flow. I don't know if reducing the amount of 90 degree fittings would help but I guess I need an extra pump to drive this loop.
The MCP35X can't even bleed out air itself, I use tap water to flush the loop and get most of the air out. Right now this loop can support web browsing etc. but can't survive any stress test.

I'm thinking about iceman pump res combo but I prefer to put everything inside the case. What's the smallest option out there with a decent amount of pressure? Will putting in another DDC pump solve my problem?

Any suggestions would be highly appreciated!
 
Last edited:

thelaughingman

SFF Guru
Jul 14, 2018
1,009
1,091
I'm currently using the Iceman with Bitspower DDC pump to power my triple rad build as well - 2x Leviathan SF240 + 1x TX240 and yes the flow rate is rather weak even at 3000RPM. IMO only a D5-based solution will solve this issue or you'll have to reduce the number of components in the loop.
 

zk2004mb

Trash Compacter
Original poster
May 23, 2020
38
10
I'm currently using the Iceman with Bitspower DDC pump to power my triple rad build as well - 2x Leviathan SF240 + 1x TX240 and yes the flow rate is rather weak even at 3000RPM. IMO only a D5-based solution will solve this issue or you'll have to reduce the number of components in the loop.
Have you bleed out all the air? I'm guessing I have airlock but I have no idea how's the performance even in the "perfect" no air loop.
 

zk2004mb

Trash Compacter
Original poster
May 23, 2020
38
10
I'm currently using the Iceman with Bitspower DDC pump to power my triple rad build as well - 2x Leviathan SF240 + 1x TX240 and yes the flow rate is rather weak even at 3000RPM. IMO only a D5-based solution will solve this issue or you'll have to reduce the number of components in the loop.
Have you bleed out all the air? I'm guessing I have airlock but I have no idea how's the performance even in the "perfect" no air loop.
 

biopunk

Cable-Tie Ninja
Bronze Supporter
Sep 24, 2020
204
288
Hi folks! I finally finished my triple rad NR200 build. But one DDC pump seems not strong enough to drive my loop.

Here are the components:
1x Black Ice 280GTS rad
2x XSPC TX240 rad
17x 90 degree fittings (I know it's kinda crazy.....)
1x quick release plug(pretty restrictive)
1x Apogee Drive II (CPU block + Integrated Swiftech MCP35X DDC pump, 18W)
1x GPU block

So I end up with a really weak flow. I don't know if reducing the amount of 90 degree fittings would help but I guess I need an extra pump to drive this loop.
The MCP35X can't even bleed out air itself, I use tap water to flush the loop and get most of the air out. Right now this loop can support web browsing etc. but can't survive any stress test.

I'm thinking about iceman pump res combo but I prefer to put everything inside the case. What's the smallest option out there with a decent amount of pressure? Will putting in another DDC pump solve my problem?

Any suggestions would be highly appreciated!

You might have some air stuck in the pump block. Try orienting the pump horizontally (not upside down!) and shaking the case a bit while bleeding. You'd need to have a T-fitting or a reservoir above the pump for air to escape.
Why did you use so many 90 degrees? That seems excessive with soft tubing. Removing 1-2 won't make a difference but 8+ in terms of flow restriction would be close to removing a radiator. Replacing multiple 90 degrees with 45 degrees might also help.
If the flow rate will still be too low, I'd remove one TX240 of the two whichever gets worse airflow (likely the bottom one) and just run 2 fans as intake. As a benefit, two other radiators would be getting colder air if you run them as exhaust.
 
Last edited:

zk2004mb

Trash Compacter
Original poster
May 23, 2020
38
10
You might have some air stuck in the pump block. Try orienting the pump horizontally (not upside down!) and shaking the case a bit while bleeding. You'd need to have a T-fitting or a reservoir above the pump for air to escape.
Why did you use so many 90 degrees? That seems excessive with soft tubing. Removing 1-2 won't make a difference but 8+ in terms of flow restriction would be close to removing a radiator. Replacing multiple 90 degrees with 45 degrees might also help.
If the flow rate will still be too low, I'd remove one TX240 of the two whichever gets worse airflow (likely the bottom one) and just run 2 fans as intake. As a benefit, two other radiators would be getting colder air if you run them as exhaust.
I used excessive 90 degree fittings because I was trying to optimize the airflow. The combination of 90s helped me avoid massive tubing. But I obviously forget about the ability of single DDC.
I'm rerouting the loop and this time I will use as less 90 fittings as possible. If the single mcp35x still struggles, the iceman with extra pump will by my only choice.