[SOLVED] 40mm fan as case fan worthy?

[trandaa]

Hello good people,
a HDD of my All-in-One Acer just died, so I decided to disassemble it to swap the HDD. I decided to put a small dedicated GPU into it too, it's just a GT 730, nothing extraordinary.
I found out, that I can mount a 40mm fan on the top of the PC. Is that worthy or should I pass it? The temperatures without the GPU are alright so far, but dunno how much the GPU will affect the temperatures inside, it has active cooling. Since I've got one free fan connector on my MoBo, I could use it.

Specs
CPU: i3-530
CPU Cooler: Some Cooler Master
MoBo: Acer OEM
RAM: 4x2GB Samsung DDR3
GPU: NVIDIA GT 730 1GB
PSU: Noname 220W

Thank you for your input

 

[Barty1884]

If temps are fine as is, a 40mm fan isn't likely to improve anything - and will probably sound like a jet engine.

Sanity check CPU/GPU temps and, unless they rise substantially (unlikely), then I wouldn't bother.

 

[trandaa]

Okay, thank you for your input, I'll monitor and then decide

 

[7664stefan]

Which case is it? Can you add a photo of the inside view?

 

[trandaa]

It's an Acer Aspire Z3750 All-in-One PC.
The mount for the fan is on the top left, right where the screw holding the GPU is going through (please don't comment the way how I fasten the GPU, but I'm not really fancy spending 25€ on the used bracket, when I can solve it with 1 screw, 1 washer and 3 nuts for 50 cents)
Here's the picture:

https://imgur.com/VLurt9y

View: https://imgur.com/VLurt9y