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Question about case fans

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Fleetwire

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May 5, 2020
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I'm buying a be quiet! Pure Base 500DX case to replace my crappy HP Pavilion pre-built case that has plagued my existence, prompting me to buy this case and "build" my first PC. I was having some doubts about the cooling. The fans that come with it are three Non-PWM 1000rpm 140mm fans, one on the top, rear and front. I was originally planning to move the top fan as an intake to the front to have two as intakes, and use the rear one as an exhaust.

Now I'm planning to also buy two 140mm High Speed (1600 rpm) PWM fans to replace my front fans, and I want to keep the exhaust 140mm always running at 1000rpm. Is it enough to take out the hot air and ensure good airflow or should I get a high speed PWM exhaust as well? My specs on the current pre-built are i7-8700 & ZOTAC RTX 2070 Mini. I'm planning on buying an Z390 Aorus Pro motherboard, and as for the CPU cooler, I'm planning to buy a Thermaltake UX200 ARGB, in case you want to know what kind of heat I'll be dealing with. I'm on a budget with a little extra spent on motherboard.

Of course, I could also place one of the built-in fans on the top as an additional exhaust running at 1000rpm...

Or am I being entirely stupid, and two 140mm 1000rpm intakes & one 140mm 1000rpm exhaust are enough?

Anyone? I need help.
 
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Why not just decide after building your PC when you can see the temperature results and hear the noise
in my opinion, 2 intake with 1 exhaust already seems enough
 
joemama said:
Why not just decide after building your PC when you can see the temperature results and hear the noise
in my opinion, 2 intake with 1 exhaust already seems enough
Click to expand...
2 intake 1 exhaust sounds enough to me but I'm not sure about the stock fans' rpm. noise doesn't matter to me.
 
i would put fans on any case opening, incl front.
this allows for lower rpm when there isnt any load on the rig (idle/surfing etc) but still provides some airflow.
dont get fixed on rpm, you can have fans with 800 pushing more air than others doing 1000.

look at arctics lineup. quality is easily compared to noctua/noiseblocker (for all you "noctua is the best": how many of their fans have 10y warranty and cost ~10$ fro a silent fan?).
use the pwm or pwm/pst multipack, usually around 25-35$ depending on size/type.
the F-series is usually best for case/airflow, the P series for heatsink/restricted flow, but ive used them either way without big loss.
i would get pwm-pst, this way you can chain 2 fans together and connect to 1 fan header (less fan ports to set in bios).

the board lets you change to pwm and put it on silent profile, with rpm based on cpu temp...
F14 pwm pst

F14 pwm
 
Fry178 said:
i would put fans on any case opening, incl front.
this allows for lower rpm when there isnt any load on the rig (idle/surfing etc) but still provides some airflow.
dont get fixed on rpm, you can have fans with 800 pushing more air than others doing 1000.
Click to expand...
Good to know, I'll use a combination of the fans I get with the case and the ones I'm buying if the airflow isn't good enough.
 
You're overthinking this, mesh front and 3 good fans in stock - that's good enough.
 
@authorized
and?
if the poster didn't care, they would have bought an off the shelf hp/dell or gateway and wouldn't be posting here. :D

or the fact that some ppl change their mind about hw/setup AFTER "finishing" the rig.
e.g. i never cared about "noise" from a pc (fans/drives) before until i had my first x86 computer sounding like a vacuum cleaner.
 
Fleetwire said:
Well yes I'm overthinking this, never bought a case or built a PC before. I have no idea how these things work.
Click to expand...
Don't buy any fans until you build the system and have it running.
 
1. There is no need to balance intake's an exhausts... tho generally you wnat to have 1.3 to 1.5 times as many intakes as exhaust as intake filters can recue air flow by as much as 30%. If you do not, negative case pressure can result. While this is not a bad thing in and of itself, the problem most folks identify with neg air pressure is "dust coming in from unfiltered openings" But that's the least of the problems.

2. Most folks ignore one of the most iportant factors in case cooling ... those giant open grilles on the read and sides and the vented slot covers. What to thedse three things have in common ?

  • Window fan in room
  • Attic fan
  • Kitchen exhaust fane
  • Fan in your car's engine compartment
None of them have a "matching fan". In your bedroom place a fan in a window.... turn it on, nothing happens. No open the other window and now you have great air flow. You don't need another fan to "balance" anything'... you blow the air out with he fan, the resulting negative pressure passs the exact same air flow thru the fan as the opening in the wall. So now, you don't beed to balance anything. What the fan is depends on where it is.

Front - Intake
Bottom - Intake
Side - Usually Intake
Top - It depends

In air cooled boxes, I lean intake but only if you have that 1.3 - 1.5 ratio. Otherwise, if you suck more air out than ya blow in, make up air will come in thru those rear grilles and vented slot covers. And what is the air like nak there ? ... ya know... right next tou you 600 watt PSU and 280 watt GFX card .... ots all hot air exhaust from the GPU and PSU.

Fan @ front 1x be quiet Pure Wings 2 | 140mm
Fan @ front 1x be quiet Pure Wings 2 | 140mm

Fan @ rear 1x be quiet Pure Wings 2 | 140mm
Fan @ top 1x be quiet Pure Wings 2 | 140mm
Fan @ top 1x be quiet Pure Wings 2 | 140mm

The ones in bold are optional

So lets look at "out of the box"
Fan @ front 1x be quiet Pure Wings 2 | 140mm (intake)
Fan @ rear 1x be quiet Pure Wings 2 | 140mm (exhaust)
Fan @ top 1x be quiet Pure Wings 2 | 140mm (exhaust)

And let's assume 15% loss w/ the front fan intake filter (85%)

Intake = 1 x 140mm x 85% ... we essentially have 85% of a 140mm fan blowing in
Exhaust = 2 x 140mm x 100% ... we have 200% of a 140mm fan blowing in

That's 2.35 times more air going out than in

Its going to come in thru the bottom, the unfilled mounts at the top and front was well as the vented slot covers

With all mounts filled

Intake = 2 x 140mm x 85% ... we essentially have 170% of a 140mm fan blowing in
Exhaust = 3 x 140mm x 100% ... we have 300% of a 140mm fan blowing in

Again ... 1.76 times more out than in ... to my eyes, the lack of fan mounts at the bottom is a deal killer for me.
 
I have to agree with the above posts. Stock fans should be sufficient. I have high speed fans mainly just to show off. Even during summer they don't exceed 1500 RPM. Front intakes (CM Jetflos) at 45% PWM and single rear exhaust (Noctua F12) at 60% PWM. CPU fan (Noctua IPPC 3000) ramps up (barely) under load.
 

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Given that the OP is buying a relatively good cpu cooler, I generally agree with what has already been said (2x front + 1 rear stock ). Moar/better fans or an AIO can always be added later should his/her temps start running high or the stock fans are too loud for some reason :D
 
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