F5F Stay Refreshed Power Users Overclocking Can you use T-Line Fitting in this way? (please refer to the uploaded image)

Can you use T-Line Fitting in this way? (please refer to the uploaded image)

Can you use T-Line Fitting in this way? (please refer to the uploaded image)

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pidies
Member
151
02-23-2026, 10:04 PM
#1
The image provided illustrates a diagram of what I intend to construct, understanding that the T-Fitting is typically employed as a drain or barb. I'm considering using it in this configuration: 1-outlet Pump/Reservoir → Radiator → T-Fitting → CPU/GPU → 2-inlet Pump/Reservoir. I'm aware of common setups like Pump/Reservoir → Radiator → CPU, but prefer avoiding tubing connections between the CPU and GPU to prevent warm water flow between them. I thought about using a T-Fitting instead, as seen here: http://www.xs-pc.com/hose-fittings/g14-t...ack-chrome. My main worry is whether using a T-Fitting will ensure equal flow to both the CPU and GPU.
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pidies
02-23-2026, 10:04 PM #1

The image provided illustrates a diagram of what I intend to construct, understanding that the T-Fitting is typically employed as a drain or barb. I'm considering using it in this configuration: 1-outlet Pump/Reservoir → Radiator → T-Fitting → CPU/GPU → 2-inlet Pump/Reservoir. I'm aware of common setups like Pump/Reservoir → Radiator → CPU, but prefer avoiding tubing connections between the CPU and GPU to prevent warm water flow between them. I thought about using a T-Fitting instead, as seen here: http://www.xs-pc.com/hose-fittings/g14-t...ack-chrome. My main worry is whether using a T-Fitting will ensure equal flow to both the CPU and GPU.

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JordansTardis
Junior Member
5
02-24-2026, 06:05 PM
#2
Animemangamer :
But the cooling liquid volume is significantly larger than the contact area for the CPU and GPU, so the water won’t become excessively hot. Maintaining a proper temperature gradient between the CPU/GPU and the coolant is more crucial. However, the T-connector will reduce your flow rate by over half since it doubles the effective cross-sectional area and adds impedance through directional changes. This may lead to a situation where the pump lacks sufficient power to function correctly. In the worst case, all the water might end up flowing to the GPU because it can’t push it further up to the CPU...
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JordansTardis
02-24-2026, 06:05 PM #2

Animemangamer :
But the cooling liquid volume is significantly larger than the contact area for the CPU and GPU, so the water won’t become excessively hot. Maintaining a proper temperature gradient between the CPU/GPU and the coolant is more crucial. However, the T-connector will reduce your flow rate by over half since it doubles the effective cross-sectional area and adds impedance through directional changes. This may lead to a situation where the pump lacks sufficient power to function correctly. In the worst case, all the water might end up flowing to the GPU because it can’t push it further up to the CPU...

J
JohnMaiI
Member
67
02-24-2026, 06:17 PM
#3
Since the cooling liquid volume far exceeds the contact area for the CPU and GPU, the water won't become excessively hot. Maintaining a strong flow rate is essential to ensure a suitable temperature difference between the components and the coolant. However, the T-connector will reduce your flow rate by over half, as it doubles the effective cross-sectional area and adds more resistance by changing flow direction. This may lead to a situation where the pump lacks sufficient power to function properly. In the worst case, all the water might end up flowing to the GPU because it can't push it further up to the CPU. What you have is a clever concept, but it likely performs better if you direct the flow to the CPU first before the GPU.
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JohnMaiI
02-24-2026, 06:17 PM #3

Since the cooling liquid volume far exceeds the contact area for the CPU and GPU, the water won't become excessively hot. Maintaining a strong flow rate is essential to ensure a suitable temperature difference between the components and the coolant. However, the T-connector will reduce your flow rate by over half, as it doubles the effective cross-sectional area and adds more resistance by changing flow direction. This may lead to a situation where the pump lacks sufficient power to function properly. In the worst case, all the water might end up flowing to the GPU because it can't push it further up to the CPU. What you have is a clever concept, but it likely performs better if you direct the flow to the CPU first before the GPU.

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mrminer02
Member
183
02-25-2026, 04:06 PM
#4
Butttface :
The cooling liquid volume is significantly larger than the contact area for the CPU and GPU, so the water won't become excessively hot. Maintaining a proper temperature gradient between the CPU/GPU and the coolant is more crucial. However, the T-connector will reduce your flow rate by over half because it doubles the effective cross-sectional area and adds impedance through direction changes. This might lead to insufficient power for the pump to function properly. In the worst case, all water could end up flowing to the GPU since it lacks the necessary power to transport it fully to the CPU.

What you're proposing is a smart approach, but it's likely more effective if you prioritize cooling the CPU first before the GPU.

Yes, your observation is valid. The concern is that the liquid might not flow efficiently into the CPU via the T-line, unlike the GPU which uses hybrid cooling with two fans. With the D5 Vario offering speed settings from 1 to 5, adjusting it to maximum could help.

It makes sense considering the limitations of a T-line, but a Y-Splitter might offer better flow?
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mrminer02
02-25-2026, 04:06 PM #4

Butttface :
The cooling liquid volume is significantly larger than the contact area for the CPU and GPU, so the water won't become excessively hot. Maintaining a proper temperature gradient between the CPU/GPU and the coolant is more crucial. However, the T-connector will reduce your flow rate by over half because it doubles the effective cross-sectional area and adds impedance through direction changes. This might lead to insufficient power for the pump to function properly. In the worst case, all water could end up flowing to the GPU since it lacks the necessary power to transport it fully to the CPU.

What you're proposing is a smart approach, but it's likely more effective if you prioritize cooling the CPU first before the GPU.

Yes, your observation is valid. The concern is that the liquid might not flow efficiently into the CPU via the T-line, unlike the GPU which uses hybrid cooling with two fans. With the D5 Vario offering speed settings from 1 to 5, adjusting it to maximum could help.

It makes sense considering the limitations of a T-line, but a Y-Splitter might offer better flow?

X
xAhmetEmir
Junior Member
11
02-26-2026, 01:30 PM
#5
You're right, doing this in parallel would lead to inconsistent flow and a drop in pressure. I wouldn't recommend it.
X
xAhmetEmir
02-26-2026, 01:30 PM #5

You're right, doing this in parallel would lead to inconsistent flow and a drop in pressure. I wouldn't recommend it.

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PitufoGreen
Member
109
02-26-2026, 02:53 PM
#6
Animemangamer :
But the volume of cooling liquid is significantly larger than the contact area for the CPU and GPU, so the water won’t become excessively hot. Maintaining a proper temperature gradient between the CPU/GPU and the cooling liquid is more crucial. Still, the T-connector will reduce your flow rate by over half because it doubles the effective cross-sectional area and adds more impedance by changing the flow direction with the connector. This might lead to a situation where the pump lacks sufficient power to function properly. In the worst case, all the water could end up flowing to the GPU since it can’t pump it effectively to the CPU.

What you’re proposing is indeed a smart approach, but it’s likely more effective if you start with the CPU before moving to the GPU.

You’re absolutely right about this point. That’s exactly what I was worried about – the liquid might not flow well into the CPU through the T-line, unlike the GPU which has two fans for cooling even without liquid. Considering the D5 Vario supports speed settings from 1 to 5, would adjusting it to maximum help?

It makes sense considering the design of a T-line, but what about using a Y-splitter instead? It might offer slightly better flow:

In theory, a y-splitter could improve performance, though only marginally. The main reason for reduced flow rate and pressure is splitting the flow into parallel streams. If you truly need separate streams, installing two dedicated pumps for the GPU and CPU would be ideal. Multiple pumps could realistically share the same fluid reservoir using either T or Y connectors.
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PitufoGreen
02-26-2026, 02:53 PM #6

Animemangamer :
But the volume of cooling liquid is significantly larger than the contact area for the CPU and GPU, so the water won’t become excessively hot. Maintaining a proper temperature gradient between the CPU/GPU and the cooling liquid is more crucial. Still, the T-connector will reduce your flow rate by over half because it doubles the effective cross-sectional area and adds more impedance by changing the flow direction with the connector. This might lead to a situation where the pump lacks sufficient power to function properly. In the worst case, all the water could end up flowing to the GPU since it can’t pump it effectively to the CPU.

What you’re proposing is indeed a smart approach, but it’s likely more effective if you start with the CPU before moving to the GPU.

You’re absolutely right about this point. That’s exactly what I was worried about – the liquid might not flow well into the CPU through the T-line, unlike the GPU which has two fans for cooling even without liquid. Considering the D5 Vario supports speed settings from 1 to 5, would adjusting it to maximum help?

It makes sense considering the design of a T-line, but what about using a Y-splitter instead? It might offer slightly better flow:

In theory, a y-splitter could improve performance, though only marginally. The main reason for reduced flow rate and pressure is splitting the flow into parallel streams. If you truly need separate streams, installing two dedicated pumps for the GPU and CPU would be ideal. Multiple pumps could realistically share the same fluid reservoir using either T or Y connectors.