Upgrading fan to be quieter for my Dell Optiplex 7010

[octechno95]

I have a Dell Optiplex 7010 (it's a slim line PC) with an Intel i5 processor. I've set it up to be a Plex media server. It's not loud but it's not quiet either. I was wondering if anyone knows of an easy fan upgrade that will make it considerably quieter. I know this might be challenging due to the slim form factor but thought I'd check.

I don't use the PC for gaming or anything other than as a Plex media server. I have a few 4k movies (which wouldn't be transcoded). The rest are 1080p or 720p which may get transcoded. I don't expect it to server more than one video stream at a time.

Pictures of the PC:

Inside: https://www.dropbox.com/s/24zzpy8c11q55er/inside.jpg?dl=0
Front: https://www.dropbox.com/s/f9wwsdprchewc00/front.jpg?dl=0

 

[octechno95]

I just had a look at the mounting points and it doesn't look standard. It has two screws on one edge, and on the other edge it has a single screw (so 3 in total, a triangle formation). Having had a deeper look, it definitely has some big dust balls which probably don't help. I'll try removing and cleaning it as described. I'll also add some Grizzly TIM (seems to have really good reviews for it).

Once I done the above, I wonder if I can disable the case fan to help make it quieter.