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Chassis fan configuration when you have a radiator

post #1 of 3
Thread Starter 
If you have a radiator:
- Directly attached to the case and not heat piped
- Radiator fans pushing air out of the case
- Radiator not mounted where the case's standard exhaust fans will be cooling it

...of what use is the default intake/exhaust setup? It seems like the case exhaust fans would serve no purpose, but I have no data to back this up. This is for my first liquid build. Several pictures of rigs from system builders who are far more experienced than I am show what appear to be fans in default exhaust configuration, so maybe I'm making a big fuss over nothing and it's not something most people mess with.

-----

First part phrased and described the way it is so people searching about this can find generally useful information.

Specific details about my setup:

Case is a PC-A71F. I've got a top mounted rad with 6 fans in push/pull taking air out through the top, with 2x140 front intake and 2x120 rear exhaust. Of the two exhaust fans, one is in a normal spot in the center of the back panel and one is in the upper rear drive cage -- PSU is at the bottom of this case. The drive cage is getting taken out to make room for the radiator, and its fan with it which will drop the exhaust fans down to one.

What do you think? Leave the single 120mm exhaust where ti is, or flip it for intake? 6 AP-15s getting air out of the case and two intake 140mms just doesn't seem like enough.

Thanks!
Edited by Glacialis - 3/26/11 at 3:02pm
    
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post #2 of 3
Quote:
Originally Posted by Glacialis View Post
If you have a radiator:
- Directly attached to the case and not heat piped
- Radiator fans pushing air out of the case
- Radiator not mounted where the case's standard exhaust fans will be cooling it

...of what use is the default intake/exhaust setup? It seems like the case exhaust fans would serve no purpose, but I have no data to back this up. Tis is for my first liquid build. Several pictures of rigs from system builders who are far more experienced than I am show what appear to be fans in default exhaust configuration, so maybe I'm making a big fuss over nothing and it's not something most people mess with.

-----

First part phrased and described the way it is so people searching about this can find generally useful information.

Specific details about my setup:

Case is a PC-A71F. I've got a top mounted rad with 6 fans in push/pull taking air out through the top, with 2x140 front intake and 2x120 rear exhaust. Of the two exhaust fans, one is in a normal spot in the center of the back panel and one is in the upper rear drive cage -- PSU is at the bottom of this case. The drive cage is getting taken out to make room for the radiator, and its fan with it which will drop the exhaust fans down to one.

What do you think? Leave the single 120mm exhaust where ti is, or flip it for intake? 6 AP-15s getting air out of the case and two intake 140mms just doesn't seem like enough.

Thanks!
First part was more confusing than helpful in my case... I'd suggest you set the rad to intake and the other fans to exhaust. This will give you slightly higher case temps, but cooler loop temps and it will allow you to keep the case positively pressurized so that (assuming the intakes are filtered) dust won't get sucked into the case in the gaps in panels and doors etc.
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AC Mk-800 Cobra
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post #3 of 3
Thread Starter 
I have a DEMCI filter for the 2x140mm intake fans, so I was feeling pretty good about dust until I thought about amount of air 6 AP-15s move compared to 2x140mm.

I should add that CPU and GPU are going to be in the loop, with the possibility of a 2nd loop later on with a GTX 280 where the intake 140mms are to house the current GPU and a TBD 2nd GPU. I decided not to use a motherboard block because I didn't see a lot of benefits for the cost of the block, but it would have lowered the case temps.

Now that I think about it, I don't think the front 140s can be set to exhaust -- the PC-A71F has a door on it with grills on the side to allow air to get in, but I don't see it being very effective at dispersing exhaust heat.
    
CPUMotherboardGraphicsRAM
Core i7 920 D0 (Batch 3849A866) EVGA X58 SLI SAPPHIRE Radeon HD 5870 (100281SR) - Reference G.SKILL PI+ Turbulence 12GB (6 x 2GB) DDR3 1600MHz 
Hard DriveOSMonitorKeyboard
Intel X25-M 80GB Gen2, 2x SAMSUNG Spinpoint F3 1TB Windows 7 Ultimate 64-bit ASUS VW266H 25.5" Saitek Eclipse II 
PowerCase
Enermax Galaxy EVO 1250W Lian-Li PC-A71F (custom side panel) 
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CPUMotherboardGraphicsRAM
Core i7 920 D0 (Batch 3849A866) EVGA X58 SLI SAPPHIRE Radeon HD 5870 (100281SR) - Reference G.SKILL PI+ Turbulence 12GB (6 x 2GB) DDR3 1600MHz 
Hard DriveOSMonitorKeyboard
Intel X25-M 80GB Gen2, 2x SAMSUNG Spinpoint F3 1TB Windows 7 Ultimate 64-bit ASUS VW266H 25.5" Saitek Eclipse II 
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Enermax Galaxy EVO 1250W Lian-Li PC-A71F (custom side panel) 
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