Small Fan or Big Fan?

[Synomenon]

In my Shuttle XPC, there's a small opening over my video card where a fan could blow air through to cool the video card. Above that opening is a cavity where a 120mm fan could fit, but the opening is about the size of a 60mm fan. In this case, would a 120mm fan in that cavity be better than a 60mm fan? I'm just trying to get a fan up there to blow as much cool air as possible through that opening to the video card. Also, the fan would be pretty much pressed up against the opening.

 

[Arcygenical]

Eh, the 120mm fan won't be doing ANYTHING if the hole can only physically accomodate a 60mm fan...

The hub size (motor and internals) would cover up at least 50% of the opening as it is.

Go for a 60-80mm fan.

 

[EvilTwinSkippy]

Eh, the 120mm fan won't be doing ANYTHING if the hole can only physically accomodate a 60mm fan...

The hub size (motor and internals) would cover up at least 50% of the opening as it is.

Go for a 60-80mm fan.

Yup. Actually I'd bet that when you combine the hub issue with the back pressure that would be created you'd get much worse airflow with a larger fan.