Pre Build Airflow Tips

[art_is_war]

I work in film and wanted a desktop to game on that could also double as stronger workstation to my 2019 15" MacBook (pretty much required for film) and i wanted to "do it right once" as they say. I haven't built a PC since the 3770k-being-the-height-of-tech days and definitely nothing this small. I have an excess of fans and I wanted y'alls thoughts. My initial thought was Redux intake in the front, Redux exhaust in the back, 2x A12x15 under the CPU on the bottom as intake. All intakes covered with mag filters. Anything else I should consider? Parts list below, the extra industrial NF-12s I think are going back, as they were a maybe (suggestions?)

 

 

PCPartPicker Part List

CPU: AMD Ryzen 9 3900X 3.8 GHz 12-Core Processor  (Purchased For $434.00) 
CPU Cooler: Noctua NH-U12S chromax.black 55 CFM CPU Cooler  (Purchased For $69.98) 
Motherboard: Asus ROG Crosshair VIII Impact Mini DTX AM4 Motherboard  (Purchased For $355.16) 
Memory: G.Skill Ripjaws V Series 16 GB (2 x 8 GB) DDR4-3200 Memory  (Purchased For $74.99) 
Storage: Silicon Power A60 1 TB M.2-2280 NVME Solid State Drive  (Purchased For $119.99) 
Video Card: EVGA GeForce RTX 2080 Ti 11 GB XC GAMING Video Card  (Purchased For $824.00) 
Case: Lian Li TU150 Mini ITX Desktop Case  (Purchased For $109.00) 
Power Supply: Corsair SF 600 W 80+ Gold Certified Fully Modular SFX Power Supply  (Purchased For $124.99) 
Case Fan: Noctua NF-S12B redux-1200 PWM 59.1 CFM 120 mm Fan  (Purchased For $13.95) 
Case Fan: Noctua NF-S12B redux-1200 PWM 59.1 CFM 120 mm Fan  (Purchased For $13.95) 
Case Fan: Noctua NF-F12 industrialPPC-2000 IP67 PWM 71.69 CFM 120 mm Fan  (Purchased For $25.95) 
Case Fan: Noctua NF-F12 industrialPPC-2000 IP67 PWM 71.69 CFM 120 mm Fan  (Purchased For $25.95) 
Case Fan: Noctua NF-A12X15 PWM CHROMAX.BLACK.SWAP 55.44 CFM 120 mm Fan  (Purchased For $24.90) 
Case Fan: Noctua NF-A12X15 PWM CHROMAX.BLACK.SWAP 55.44 CFM 120 mm Fan  (Purchased For $24.90) 
Total: $2241.71
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2020-04-25 16:08 EDT-0400

[Bombastinator]

I’m seeing all these “purchased for” markings.  You bought this thing already?

 

the cpu isn’t going to be what needs more air.  It’s 65-83w and you got a cooler that will do double that.  It’s the gpu that’s going to need wind. 250w. 3-4 times the heat of the cpu.

[art_is_war]

2 hours ago, Bombastinator said:

I’m seeing all these “purchased for” markings.  You bought this thing already?

 

the cpu isn’t going to be what needs more air.  It’s 65-83w and you got a cooler that will do double that.  It’s the gpu that’s going to need wind. 250w. 3-4 times the heat of the cpu.

It's slowly trickling in.

Two slots in the bottom of the case for 2 120mm fans, my question being, which fans do I put there? Are the industrials that loud? As my reading suggests the pressure biased fans would be better for the GPU then the A12x15s.

[Bombastinator]

25 minutes ago, art_is_war said:

It's slowly trickling in.

Two slots in the bottom of the case for 2 120mm fans, my question being, which fans do I put there? Are the industrials that loud? As my reading suggests the pressure biased fans would be better for the GPU then the A12x15s.

Industrials are in fact really really loud.   It’s rpm.  Industrial computer fans run over 10,000 rpm. Rpm is the key.  A “silent” is silent mostly because of rpm.  What makes most of the noise on a fan is the fastest moving point which with a fan is the outer tip of the fan blade. ao For bigger fans that number is lower because the blade is longer.  It can be effectively altered somewhat with fan shape.  Not a lot though.  So for a 120mm fan they are usually silent or near silent if the rpm is kept below 800-1000 rpm.  Higher for smaller fans lower for larger ones. A thinner fan will have lower cfm per rpm.  The other part of industrial is bearing type.  Different types of bearings make differing amounts of noise and hold up well in different fan orientations vs gravity.  

[art_is_war]

So plan now are the two low profile A12s under the GPU as intake, and the two redux 1200s set up as intake/exhaust in the front/back?

[Bombastinator]

5 minutes ago, art_is_war said:

So plan now are the two low profile A12s under the GPU as intake, and the two redux 1200s set up as intake/exhaust in the front/back?

If the gpu is pointing sideways. As it would in a tower configuration, the fans below it will have vertical bearing shafts with the bottom on the bottom and the top on the top.  Two bearing, 3 bearing, or modified rifle (fluid dynamics or a bunch of other brand names) will be needed.  One bearing has a 50% chance of working (depending if the bearing is at the bottom or top of the spindle) and sleeve bearing will wear out FAST.  Fans on the bottom will act as helper fans for the gpu fan blowing air across the cooler.  Hot  Air will exaust out the sides and still need to be gotten rid of though.  (Unless it’s a hamster wheel fan in which case the air goes out the back and you don’t have to worry about it.  Hamster wheel coolers have their advantages)