push pull fan set ups

trt740 · Oct 1, 2009

Anyone else ever notice that when a heat sinks has fans in this position one fan almost always buzzes. I found you have to turn down the pulling fans rpms to make it go away. This has happened to me with several different fans and on different heat sinks. Alone the fans are silent but together one buzzes.

Bjorn_Of_Iceland · Oct 1, 2009

Its normal for some fans. High rpm makes the propeller pull off from its body.. if you press the propeller in the middle while on the buzzing sound, you will notice it will lose that sound.. the same goes if you lie it down flat (with the air blowing against the ground), the buzz sound would disappear but still maintain high rpm.

trt740 · Oct 1, 2009

yes I noticed

SonDa5 · Oct 2, 2009

On my Rig I have a huge scythe kaze 120x120x38 pushing and a 120x120x25 PWM corsair fan pulling and there is no buzzing at all.

Scythe is at 2848 RPM (push)
Corsair fan is at 1740 (pull)

SonDa5 · Oct 2, 2009

SonDa5 said:
On my Rig I have a huge scythe kaze 120x120x38 pushing and a 120x120x25 PWM corsair fan pulling and there is no buzzing at all.

Scythe is at 2848 RPM (push)
Corsair fan is at 1740 (pull)

I'll have to swap fan positions some time to check for buzzing and improvement in temps.

Have you noticed any differences in temps based on rpms and push and pull positions?

System Name	Apple Bite
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System Name	Apple Bite
Processor	Intel I5
Motherboard	Apple
Memory	40gb of DDR 4 2700
Video Card(s)	ATI Radeon 500
Storage	Fusion Drive 1 TB
Display(s)	27 Inch IMac late 2017

System Name	Black Killing Machine
Processor	Delidded NO IHS mount Intel i7-4770k
Motherboard	Gigabyte Z87X-OC
Cooling	Swiftech DIR655 pump, Watercool HEATKILLER® GPU-X³ 79X0 Ni-Bl gpu, DT SNIPER CPU block, UT60 420 RAD
Memory	Gskill Trident 2400mhz CL9 Samsung IC9
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Power Supply	Seasonic Platinum 860
Software	Windows 7 Pro 64bit
Benchmark Scores	http://hwbot.org/user/sonda5/ Delidding is magic. http://valid.canardpc.com/2878462

System Name	Black Killing Machine
Processor	Delidded NO IHS mount Intel i7-4770k
Motherboard	Gigabyte Z87X-OC
Cooling	Swiftech DIR655 pump, Watercool HEATKILLER® GPU-X³ 79X0 Ni-Bl gpu, DT SNIPER CPU block, UT60 420 RAD
Memory	Gskill Trident 2400mhz CL9 Samsung IC9
Video Card(s)	SAPPHIRE HD7950 OC 950mhz Edition, VaporX HD7950
Storage	2xM4 Crucial 64GB RAID 0, 1 OCZ AGILILITY 3 60GB, WDCB 500GB x2RAID0, WD Green, Hitachi 1TB
Display(s)	Samsung SyncMaster 226BW and 24" 120hz BenQ gamer
Case	SilverStone Raven rv-02
Audio Device(s)	Audio Technica ATH-AD900 headphones, Topping D2 DAC/Headphone AMP
Power Supply	Seasonic Platinum 860
Software	Windows 7 Pro 64bit
Benchmark Scores	http://hwbot.org/user/sonda5/ Delidding is magic. http://valid.canardpc.com/2878462

push pull fan set ups

trt740

Bjorn_Of_Iceland

trt740

SonDa5

SonDa5