200mm fan vs. 2x 140mm fans in Phanteks EVOLV ITX

[CrustyDaddy]

I am reviving this thread because 200mm vs 2x140mm is still a relevant topic and previous points are still valid. I have an Enthoo Evolv ITX case with a Cryorig H7 cooler and the original 200mm case fan. I have modified the front panel by drilling 35 half inch holes. But, I'm still not happy with the airflow. The max CPU temps are 6 C lower with the side panel off, so I know the cooler can perform better, which is why I'm considering trying 2 140s. How are members coming to the conclusion that 2 140s would provide better cooling? My thinking is that higher quality fans could push more air due to higher pressure, but I don't know. Mathematically, the area of a 200mm circle is slightly larger than the area of 2 140mm circles. 

A ≈ 31415.93

vs

A ≈ 15393.8 x 2

Has anyone actually tested 200mm vs 2 140s?

[_Hustler_One_]

The single 200mm on the front Evolv ITX is known to be weaker than dual 140mm as the front vents are narrow. If you want to use 140mm in front of it, be mindful  to get the M3 screws to mount them, because of the case front 140mm fan mounts are not the regular ones like in most of the case, they're more like a radiator screw hole mounts like the 200mm fan mounts, so you can't use the included screws which come together with most of fans. You can use the 200mm fan screws but you need 4 more of them if you want to use dual 140mm fans.

 

In my place, because I can't find this type of screw in my area to buy, so I use small zip ties instead.

 

[_Hustler_One_]

2 hours ago, CrustyDaddy said:

I am reviving this thread because 200mm vs 2x140mm is still a relevant topic and previous points are still valid. I have an Enthoo Evolv ITX case with a Cryorig H7 cooler and the original 200mm case fan. I have modified the front panel by drilling 35 half inch holes. But, I'm still not happy with the airflow. The max CPU temps are 6 C lower with the side panel off, so I know the cooler can perform better, which is why I'm considering trying 2 140s. How are members coming to the conclusion that 2 140s would provide better cooling? My thinking is that higher quality fans could push more air due to higher pressure, but I don't know. Mathematically, the area of a 200mm circle is slightly larger than the area of 2 140mm circles. 

A ≈ 31415.93

vs

A ≈ 15393.8 x 2

Has anyone actually tested 200mm vs 2 140s?

My case is the Tempered Glass version so it doesn't come with the 200mm but a single 140mm rear fan instead.

 

I assume that without considering they are mounted on a PC case, generally the 200mm is maybe better in airflow but inferior in static pressure  than 140mm.

I use 2x140mm Noctua NF-A14 3000, I tested at 2100 RPM with and without side panel, the temps difference was only 2C. Idk if the RPM I tested on it was relevant, right now I run them at 1500 RPM. The significant difference between 1500 vs 2100 RPM is the GPU temps, at 2100 RPM the GPU temps is 10C lower than the CPU, while 1500 RPM the GPU temps is 4C higher than the CPU temps.

[CrustyDaddy]

Ah, thanks Hustler. I thought about your post and did some tinkering with my fan curves. I am able to get the CPU down to open panel levels without too much noise.

[_Hustler_One_]

Yes, on Noctua's 140 iPPC fans, over 1800 rpm is starting to get noisy.

 

I use M.2 SSD and any 2.5" HDD/SSHD/SSD storage drive instead of 3.5" HDD to allows me to completely take off the 3.5" drive cage, so I make a clear area behind the bottom front fan by doing that, also manage the PSU cables as much as I could to not get in the area where the 3.5" drive cage was.

 

The difference between with and without 3.5" drive cage is 3-4C for the GPU, it's not significant margin but this is worked.