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need help selecting case fans

Prd_407
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hi people, my pc case a acer prebuilt case only has place for 1 front 120 mm  fan and a 120/140 mm at rear   

currently i have 1 120 mm fan as front intake but its not doing much 

so, i need help what fans i should get and how do i set up means front intake rear exaust or vice versa    or both intake,etc  

and which ones should i buy 

only criteria is fans should perform well and work without issues with 3 pin fan headers on my mother board and i should get most cfm possible 

don't care of noise much

i have attached few photos of my computer its just a acer cheap prebuilt,

and im most probably gonna buy from flipkart.com

post-68030-0-09073600-1395810435_thumb.j

post-68030-0-83874700-1395810454_thumb.j

post-68030-0-13660600-1395810471_thumb.j

post-68030-0-02468700-1395810487_thumb.j

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are you sure them arnt 80/92mm fans slots?

Main Rig: CPU: 3570k Mobo: ga-z77x-ud5h-wb :RAM: 8gb kingson ddr3 1600 :gpu crossfire amd 290's Case: zalman z9 plus Cooler: h80i p/p SSD: nutron 120gb HDD: 2tb wd green 4tb seagate desktop                                              

Girlfirends: CPU: 8350 Mobo 990fxa-ud3 Ram 8gb kingson ddr3 1600 gpu: his 7850 case: inwin dragon rider SSD: nutron 120gb HDD: 2tb seagate                                                                                                                                         

                                                                                                                                                                                                                                                                                                                                                                                                                  

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You definitely got those sizes wrong. The front fan is an 80/92mm fan like @GeneralBear said, and the rear is a 120mm.

 

I would clean that computer before adding fans.

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are you sure them arnt 80/92mm fans slots?

ya  i measured with a ruler diagonaly

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ok , im asking how do i measure , i mean from screw to screw or rough diameter of fan blade's circle

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ya  i measured with a ruler diagonaly

sorry just oems tend to use 80/92

Main Rig: CPU: 3570k Mobo: ga-z77x-ud5h-wb :RAM: 8gb kingson ddr3 1600 :gpu crossfire amd 290's Case: zalman z9 plus Cooler: h80i p/p SSD: nutron 120gb HDD: 2tb wd green 4tb seagate desktop                                              

Girlfirends: CPU: 8350 Mobo 990fxa-ud3 Ram 8gb kingson ddr3 1600 gpu: his 7850 case: inwin dragon rider SSD: nutron 120gb HDD: 2tb seagate                                                                                                                                         

                                                                                                                                                                                                                                                                                                                                                                                                                  

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ok , im asking how do i measure , i mean from screw to screw or rough diameter of fan blade's circle

screw to screw

Main Rig: CPU: 3570k Mobo: ga-z77x-ud5h-wb :RAM: 8gb kingson ddr3 1600 :gpu crossfire amd 290's Case: zalman z9 plus Cooler: h80i p/p SSD: nutron 120gb HDD: 2tb wd green 4tb seagate desktop                                              

Girlfirends: CPU: 8350 Mobo 990fxa-ud3 Ram 8gb kingson ddr3 1600 gpu: his 7850 case: inwin dragon rider SSD: nutron 120gb HDD: 2tb seagate                                                                                                                                         

                                                                                                                                                                                                                                                                                                                                                                                                                  

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thanks of replies

no problem

Main Rig: CPU: 3570k Mobo: ga-z77x-ud5h-wb :RAM: 8gb kingson ddr3 1600 :gpu crossfire amd 290's Case: zalman z9 plus Cooler: h80i p/p SSD: nutron 120gb HDD: 2tb wd green 4tb seagate desktop                                              

Girlfirends: CPU: 8350 Mobo 990fxa-ud3 Ram 8gb kingson ddr3 1600 gpu: his 7850 case: inwin dragon rider SSD: nutron 120gb HDD: 2tb seagate                                                                                                                                         

                                                                                                                                                                                                                                                                                                                                                                                                                  

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really i dont know much but 

is that the right way ???

post-68030-0-08200100-1395815515_thumb.j

post-68030-0-92374500-1395815530_thumb.j

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sorry just oems tend to use 80/92

may be i m wrong  as i  dont know right way but no need to sorry

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really i dont know much but 

is that the right way ???

well call my grandma and slap me silly they are 120mm front and 120/140 rear

Main Rig: CPU: 3570k Mobo: ga-z77x-ud5h-wb :RAM: 8gb kingson ddr3 1600 :gpu crossfire amd 290's Case: zalman z9 plus Cooler: h80i p/p SSD: nutron 120gb HDD: 2tb wd green 4tb seagate desktop                                              

Girlfirends: CPU: 8350 Mobo 990fxa-ud3 Ram 8gb kingson ddr3 1600 gpu: his 7850 case: inwin dragon rider SSD: nutron 120gb HDD: 2tb seagate                                                                                                                                         

                                                                                                                                                                                                                                                                                                                                                                                                                  

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thanks guys   and what about them to    work without issues with 3 pin fan headers on my mother board

as most of fans come with 4pin nowadays

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the extrapin will just hang over the fan plug on ur motherboard they are fully compatable

Main Rig: CPU: 3570k Mobo: ga-z77x-ud5h-wb :RAM: 8gb kingson ddr3 1600 :gpu crossfire amd 290's Case: zalman z9 plus Cooler: h80i p/p SSD: nutron 120gb HDD: 2tb wd green 4tb seagate desktop                                              

Girlfirends: CPU: 8350 Mobo 990fxa-ud3 Ram 8gb kingson ddr3 1600 gpu: his 7850 case: inwin dragon rider SSD: nutron 120gb HDD: 2tb seagate                                                                                                                                         

                                                                                                                                                                                                                                                                                                                                                                                                                  

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I recommend Corsair's AF120 fans.

FANBOY OF: PowerColor, be quiet!, Transcend, G.Skill, Phanteks

FORMERLY FANBOY OF: A-Data, Corsair, Nvidia

DEVELOPING FANBOY OF: AMD (GPUS), Intel (CPUs), ASRock

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the fan just arrived few minutes ago  

installed now and its up and running

post-68030-0-81136500-1396086319_thumb.j

post-68030-0-18202000-1396086336_thumb.j

post-68030-0-84692500-1396086351_thumb.j

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all good man

Main Rig: CPU: 3570k Mobo: ga-z77x-ud5h-wb :RAM: 8gb kingson ddr3 1600 :gpu crossfire amd 290's Case: zalman z9 plus Cooler: h80i p/p SSD: nutron 120gb HDD: 2tb wd green 4tb seagate desktop                                              

Girlfirends: CPU: 8350 Mobo 990fxa-ud3 Ram 8gb kingson ddr3 1600 gpu: his 7850 case: inwin dragon rider SSD: nutron 120gb HDD: 2tb seagate                                                                                                                                         

                                                                                                                                                                                                                                                                                                                                                                                                                  

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Still wondering why people measure in diagonal.. 120mm*120mm*25mm.. Theyre a square shape, so you just measure the length or width.

According to my calculations that black fan is a 92mm (it's almost 130mm diagonal) 

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i really didn't knew as screens are measure diagonally i thought fans also maybe ? 

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