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Cooling Experiment – a brief study of Asus Stack Cool 2 with a fan blowing under

post #1 of 2
Thread Starter 
This thread (http://www.overclock.net/air-cooling...processor.html) by Philistine prompts me to dig up some of my old data. After some editing, here is my thread on a much related topic.

1) Introduction
Asus Stack Cool 2 uses multi layered PCB to help dissipating the heat off the motherboard. One particular feature is a plate added underneath the CPU (socket) area to act as a heatsink. See pic 4 below.
Taking advantage of a CPU opening on Banchetto 101's motherboard tray (pic 1), a 14cm fan is installed blowing upward (pic 2).

This test aims to study the effectiveness of having such a fan on the Stack Cool 2 with respect to the temp of the CPU Cores.

2) Hardware and Software
Fan: Aerocool Streamliner 140x20 @ 1000rpm @ 55CFM @ 20dbA
CPU: i7 965 @ 3.2GHz (with Cooler Master V8 + stock fan) with HT off
Motherboard: Asus P6T Deluxe
Temp sensor (hardware): Zalman MFC-2 (measuring surface temp of Stack Cool 2) (pic 3)
Temp sensor (software): OCCT v3.0.1 measuring temp of the 4 CPU cores


3) Idle Result

Passive mode (ie no fan)
CPU 35/37/37/35
Stack Cool 2 Plate 33

Active mode (Aerocool @1000rpm)
CPU 35/37/37/35
Stack Cool 2 Plate 29

Comment: no change of CPU idle temp at all while the SC2 plate drops by 4C

4) Full load Result (OCCT for 10 minutes)
Passive mode (ie no fan)
CPU 58/61/60/58
Stack Cool 2 Plate 40

Active mode (Aerocool @1000rpm)
CPU 57/60/59/57
Stack Cool 2 Plate 35

Comment: CPU Load temp drops by 1C while the plate temp drops by 5C

5) Summary
a) From these numbers, a 14cm fan helps to bring down the temperature of the StackCool 2 plate by a hefty 4-5C. However, CPU Load temp only drops by a 'token' 1C.

b) I reckon the main reason for not having a larger temp differential is that most thermal energy generated from the CPU is being dissipated by the CPU heatsink. Therefore, only a small amount has found its way via the CPU socket to the StackCool 2 plate. As a result, even substantial cooling of the plate does not contribute much to the lowering of the CPU Load temp.

c) Needless to say, this is rather disappointing as this amount is so marginal. But I suppose having a small 'consolation prize' is better than going away empty-handed.

d) My finding is quite different from member Philistine's. As mentioned by member MCImes in that thread (post #12), I wonder if this has something to do with 'stock cooler vs aftermarket cooler'.




Edited by windfire - 3/30/11 at 4:20am
post #2 of 2
Quote:
Originally Posted by windfire View Post
This thread (http://www.overclock.net/air-cooling...processor.html) by Philistine prompts me to dig up some of my old data. After some editing, here is my thread on a much related topic.

1) Introduction
Asus Stack Cool 2 uses multi layered PCB to help dissipating the heat off the motherboard. One particular feature is a plate added underneath the CPU (socket) area to act as a heatsink.
Taking advantage of a CPU opening on Banchetto 101's motherboard tray (pic 1), a 14cm fan is installed blowing upward (pic 2).

This test aims to study the effectiveness of having such a fan on the Stack Cool 2 with respect to the temp of the CPU Cores.

2) Hardware and Software
Fan: Aerocool Streamliner 140x20 @ 1000rpm @ 55CFM @ 20dbA
CPU: i7 965 @ 3.2GHz (with Cooler Master V8 + stock fan) with HT off
Motherboard: Asus P6T Deluxe
Temp sensor (hardware): Zalman MFC-2 (measuring surface temp of Stack Cool 2) (pic 3)
Temp sensor (software): OCCT v3.0.1 measuring temp of the 4 CPU cores


3) Idle Result

Passive mode (ie no fan)
CPU 35/37/37/35
Stack Cool 2 Plate 33

Active mode (Aerocool @1000rpm)
CPU 35/37/37/35
Stack Cool 2 Plate 29

Comment: no change of CPU idle temp at all while the SC2 plate drops by 4C

4) Full load Result (OCCT for 10 minutes)
Passive mode (ie no fan)
CPU 58/61/60/58
Stack Cool 2 Plate 40

Active mode (Aerocool @1000rpm)
CPU 57/60/59/57
Stack Cool 2 Plate 35

Comment: CPU Load temp drops by 1C while the plate temp drops by 5C

5) Summary
a) From these numbers, a 14cm fan helps to bring down the temperature of the StackCool 2 plate by a hefty 4-5C. However, CPU Load temp only drops by a 'token' 1C.

b) I reckon the main reason for not having a larger temp differential is that most thermal energy generated from the CPU is being dissipated by the CPU heatsink. Therefore, only a small amount has found its way via the CPU socket to the StackCool 2 plate. As a result, even substantial cooling of the plate does not contribute much to the lowering of the CPU Load temp.

c) Needless to say, this is rather disappointing as this amount is so marginal. But I suppose having a small 'consolation prize' is better than going away empty-handed.

d) My finding is quite different from member Philistine's. As mentioned by member MCImes in that thread (post #12), I wonder if this has something to do with 'stock cooler vs aftermarket cooler'.

There are many things that could have caused the difference for (d). Philistine's motherboard is mounted vertically(1) inside of an enclosed case(2) with a side panel. Your motherboards are also very different(3).
    
CPUMotherboardGraphicsRAM
Intel 2600k (Stock) Asus Maximus Gene V  Powercolor AX6850 Passive Cooler Gskill Ripjaws DDR3 1600MHz 
Hard DriveOptical DriveCoolingOS
OCZ Vertex II 90GB External Noctua NH-D14 Windows 7 Pro 64bit 
MonitorKeyboardPowerCase
Gone Microsoft Ergonomic 4000 Keyboard Corsair AX850 Silverstone FT03B 
MouseMouse Pad
Logitech G500 Black Normal 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
Intel 2600k (Stock) Asus Maximus Gene V  Powercolor AX6850 Passive Cooler Gskill Ripjaws DDR3 1600MHz 
Hard DriveOptical DriveCoolingOS
OCZ Vertex II 90GB External Noctua NH-D14 Windows 7 Pro 64bit 
MonitorKeyboardPowerCase
Gone Microsoft Ergonomic 4000 Keyboard Corsair AX850 Silverstone FT03B 
MouseMouse Pad
Logitech G500 Black Normal 
  hide details  
Reply
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