A general rule of thumb for case fans in a ***Quiet*** running PC is as follows:
One 140mmm 1200 rpm fan for every 75 - 100 watts of component power consumption
One 120mmm 1200 rpm fan for every 50 - 75 watts of component power consumption
RTX 2080 = 205 watts
AMD 3600 = 90 watts
MoBo = 40 watts
Storage, Ram, USB, Miscellaneous = 40 watts
Say 375 watts ... Id want 4 - 5 140mm fans or 5 - 6 120mm fans, not counting those on the CPU cooler in order to have a system that made 0 audible noise. If you set up your fan curve properly, I'd guess your fans would spin at about 500- 675 rpm during gaming and maybe 800ish when stress testing. If willing to put up with noise.... fans became noticeable at around 825 - 850 rpm. Of course I am talking about the fans with the best performance / noise ratio's. More on that later.
If I understood you correctly, thou have:
Intake: One (1) 120mm and One (1) 140mm
Exhaust: One (1) 120mm and One (1) 140mm
Sound balances right ? Nope
Intake fans typically have air filters in front of them which can reduce air flow by as much as 10-15% ... when just cleaned. With dust ... it doesn't take too long to get to 30%. Among PC folks, we tend to be nerdy anal types who keep the filters reasonable claim ... for folks like me, I recommend 30% ... for my youngest son, (23) when I clean his filters ... they dust peels off like a blanket ... 50% may be light for him. Assuming the fans are all same model / same rpm, lets calculate an equivalent fan value. For the ske of argument, let's say a120mm has about 80% of the air flow as a 140mm fan, so....
120 mm fan =0.80 140 mm fans
Exhaust = 1.00 + 0.80 = 1.80 Equivalent Fans (EF)
With you losing air flow to the resistance of a semi dirty dust filter ...we'd need an extra air flow, so id want more intake
One (1) 140mm + 2 (120mm)
1.00 (140mm) + 2 x 0.8 (120mm)= 2.6 x 70% (30% blocked) =
You will have the equivalent of 1.82 fans blowing in which i bigger than 1.82. Id have a bit more confidence here as both the 8)$ flow ration and 30% resistance are conservative. Take out that conservatism and ....
1.00 (140mm) + 2 x 0.85 (120mm)= 2.7 x 80% (20% blocked) = 2.16 vs 1.80 out. This is where ya wanna be. Why ?
The amount of air in is always exactly equal to the amount or air out. With the air flow from fans being imbalanced, the "make up" air will come in thru the case grilles. The nagative most associated with this condition is dut ... but the bigger concern, for me anyway is the source and the temperature of the air bringing that dust in.
When you have more air being exhausted from the case as coimpared to being blown in, make up air will always come via the path of least resistance. That path is almost always the rear case grille and vented slot covers ... the bigger the holes, the lesser the resistance. So uyour air source is 'the air at the rear of your case. Is your casew under the desk ? On desk against the wall ? is there good air movement back thee from room ventilation ? is there a baseboard heater on that wall ? Is that were your 205 watt GFX card and 650 watt PSU exhaust to ? is that the coolest air soiurce we can find in that room ? As it stands now, you are bringing that air into your case ... do you want to bring more of that (baseboard heater, PSU exhaust, GRX card exhasut pre-heated air inside ya case ?
Adding a fan as in intake will slightly pressurize the case interior forcing air out thru the vented slot covers and rear grille... pishing that air away from your case.
If the Power Wings are as good as the Silent Wing 3s, you have among the best fans available. Taking the fans off a Noctual Cooler and replacing them with Phanteks fans, results in a whopping 6+C CPU temperature drop (See Graphic below) . This test was done before the SWs and PWs were on the market.
140 mm fans from Noctua, Phanteks, and Xigmatek battle in our latest fan roundup with one emerging as a clear winner in both thermal performance and acoustics. May 21, 2013 by Lawrence Lee Last month we staged an epic shoot-out among some popular 120 mm fans. Some great sounding fans emerged but...
silentpcreview.com
The Phanteks PH-F140HP/TS is the clear winner in every respect. It edged out the new Noctuas every step of the way, delivering the best overall results of any fan we’ve tested thus far. To top it off, it had cleanest, smoothest sound of all the new fans in this roundup. If we had to start from scratch, this might be our new reference model.
See Graphic below)
I have to mention the Silent Wing 3's came out after the test was performed. From direct experience, after having these recommended. I replaced the Phanteks on the 420 rad in our test box with 3 of the SWs. We have 6 thermal sensors in the box and a 6 channel digital display all accurate to 0.1C
Sensor 1 = 420 rad coolant inlet temperature
Sensor 2 = 420 rad coolant outlet temperature
Sensor 3 = 280 rad coolant inlet temperature
Sensor 4 = 280 rad coolant outlet temperature
Sensor 5 = Interior case air temperature
Sensor 6 = Ambient Air temperature
After testing with RoG Real Bench and Furmark ... the results comparing the 420 rad inlet and outlet temps with each of the 2 fan models were virtually neck and neck. Approaching any new build, Id say that the price of each at the time will most often be the only deciding factor ... almost
a) If it's Phanteks or BeQuiet case, you get a couple with the case
b) I compared the 1250 rpm Phanteks with the 1600 (maybe it was 1500) rpm Silent Wings from 400 rpm to 1200 rpm ... the SWs did little better at the higher rpm, Phanteks in the lower to mid range. I'd like to give it another shot with the 1000 rpm models and see how low they can go ... The phanteks were good down to 325 rpm ... the SW's about 425 rm. I have my fan curve set to turn the fans off when curve calls for less than 375 rpm or so but Id like to see if the the 1000 rpm jobs could function at 250 rpm. The BeQuiet web site shows only going down to 500 rpm, that would be a drawback for me as my fans operate from 375 - 625 or so except when doing stress testing.
Here's the results of the SilentPCReview.com testing
Here's what happens when you take the Noctua NF-A15s of a noctua cooler and replace then with Phantels fans
